🌐 API Gateway Generator Agent¶

🎯 Purpose and Architectural Role of the API Gateway in the Factory¶

🧠 Agent Identity¶

Agent Name: ApiGatewayGeneratorAgent
Cluster: software-engineering.gateway
Domain: ConnectSoft AI Software Factory – Infrastructure Surface
Position: Executes after API Designer Agent defines contracts and just before service exposure

🎯 Core Purpose¶

The API Gateway Generator Agent is responsible for autonomously generating a custom .NET Core-based API Gateway solution for each bounded context or exposed interface defined in the platform.

It translates API surface designs, cross-cutting concerns, and multi-tenant boundary rules into an operational, production-grade gateway — enforcing access, routing, policies, and observability in a composable, plugin-driven way.

🏗 Architectural Role in the Factory¶

flowchart TD
    subgraph ConnectSoft Factory
        direction LR
        API_Designer["🧩 API Designer Agent"]
        Planner["🧭 Planner Agent"]
        Gateway["🛡 API Gateway Generator Agent"]
        Auth["🔐 Identity Server"]
        Services["🧱 Microservices"]
        QA["🧪 QA Agent"]
        DevOps["🚀 CI/CD Agent"]

        Planner --> Gateway
        API_Designer --> Gateway
        Gateway --> QA
        Gateway --> DevOps
        Gateway --> Services
        Gateway --> Auth
    end

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🧭 Responsibilities by Stage¶

Stage	Role
🔄 Design-Time	Transforms API contracts + routing plan into a gateway blueprint
🏗 Build-Time	Scaffolds a full .NET Core gateway solution with required policies, middlewares, configs, and interfaces
🧪 Pre-Deploy	Validates routes, simulates tenant flows, integrates with OpenIddict
🚀 Deploy-Time	Produces deployable artifacts (Docker, Azure, Bicep, CI YAML)
🔍 Run-Time (Plugins)	Enables runtime behavior control via injected plugin filters or route modifiers

🎯 Why It’s Critical¶

Area	Contribution
🔐 Security	Enforces JWT, scopes, API keys, rate limits
🧭 Routing	Dynamic reverse proxying with DDD-awareness
🧩 Multi-Tenancy	Header/claim-based partitioning
📈 Observability	Metrics, traces, structured logs
🧬 Extensibility	Filters, middlewares, per-service plugin hooks
📚 Documentation	Emits clear operator and route docs from intent

🧠 Differentiation from Other Agents¶

Agent	Difference
Microservice Generator	Produces internal services behind the gateway
API Designer Agent	Provides contract for routing and auth setup
Release Manager	Publishes gateway artifact after it's built
Identity Server Agent	Provides token issuance, integrated by this gateway
Observability Agent	Consumes gateway metrics and logs emitted from this agent's outputs

📦 Summary¶

The API Gateway Generator Agent acts as the frontline enforcer of every software product built in the ConnectSoft Factory — translating platform-wide policies and feature blueprints into hardened, extensible, tenant-aware HTTP interfaces, all within a clean .NET Core codebase.

📦 Responsibilities – Security, Routing, Observability, Tiering¶

🎯 Overview¶

The API Gateway Generator Agent automates the creation of a hardened, policy-rich API gateway that acts as a gatekeeper, policy enforcer, traffic router, and telemetry emitter for all exposed services in the ConnectSoft ecosystem.

It translates functional contracts and platform constraints into a gateway that supports:

Fine-grained authentication and authorization
Multi-tenant-aware routing and service segmentation
Layered observability (metrics, traces, logs)
Quota enforcement and edition-based access rules
Pluggable behavior through middleware and filters

🛡 Core Responsibility Areas¶

Responsibility	Description
Routing & Path Resolution	Parses OpenAPI/DSL from API Designer to route to appropriate microservice endpoints using custom route tables or runtime config
Authentication	Integrates with Identity Server (OpenIddict) to validate JWT, access tokens, or API keys using built-in middleware
Authorization	Enforces route-level permissions via claims, scopes, and custom policies
Tenant Isolation	Extracts and routes based on tenant headers, claims, or tokens; supports edition/plan-specific gating
Rate Limiting & Quotas	Applies per-route or per-tenant rate limits, burst protection, and per-tier throttling
Observability	Emits structured logs (Serilog), metrics (Prometheus/OTel), and distributed traces for every request
Resilience	Adds retry, timeout, and circuit breaker policies per route using policy decorators
CORS Handling	Applies origin restrictions based on service configuration and environment
Plugin Injection	Supports filters (pre/post), feature toggles, and customization of request/response logic
Documentation Emission	Generates README, route map, operator documentation, and configuration summary automatically

🔐 Security Enforcements¶

Area	Detail
Auth	OpenIddict token validation, HMAC-based API key checks
Zero Trust	Token presence enforcement, scoping, deny-by-default
Plan Gating	Access gates for Premium/Basic editions
Header Scrubbing	Automatic removal of unsafe/blacklisted headers

🔀 Routing Engine Output¶

The agent generates a routing definition similar to:

app.MapGatewayRoute("/v1/payments", "PaymentService")
    .RequireAuthorization("Scope:payments.read")
    .WithRateLimit("10r/s")
    .WithTenantPartitioning("Header:X-Tenant-ID");

Or for YAML route DSL output:

- path: /v1/orders
  backend: OrderService
  auth:
    type: jwt
    scope: orders.read
  rateLimit: 5r/s
  tenantHeader: X-Tenant-ID

📈 Observability Hooks Embedded¶

Type	Tech	Scope
Logs	Serilog + Enrichers	Full request lifecycle
Traces	OpenTelemetry SDK	Per request + span linking
Metrics	Prometheus exporter	Per route, status code, latency, retries

🔐 Plan & Tier Enforcement¶

Supports:

Feature flags injected into routes based on EditionDefinition
Selective exposure of routes/methods
Rate tier enforcement (e.g., Free = 5r/s, Premium = 100r/s)

📚 Emitted Artifacts by Responsibility Area¶

Area	Output
Routing	`routes.json`, `RouteBuilder.cs`, `RouteRegistry.cs`
Auth	`JwtMiddleware.cs`, `ApiKeyValidator.cs`
Observability	`TelemetryMiddleware.cs`, `metrics.prom`, `otel-config.yml`
Tenancy	`TenantResolver.cs`, `TenantContext.cs`
Policies	`RateLimitMiddleware.cs`, `CircuitBreaker.cs`
Docs	`README.md`, `gateway-docs.json`, `gateway.routes.md`

🧾 Inputs – API Designer Outputs, Gateway Blueprint, Planner Intents¶

🎯 Purpose¶

This section details the structured inputs that the API Gateway Generator Agent consumes during its invocation. These inputs are received from:

💡 Planner Agent: task orchestration and feature selection
📐 API Designer Agent: OpenAPI specs, endpoint contracts, route metadata
🏗️ Architect Agents: Gateway blueprints and policy constraints
📦 Template Registry: Source scaffolds and reusable policy packages

📤 Primary Input Channels¶

Source	Format	Content
Planner Agent	JSON plan or task DSL	Feature flags, deployment context, tiering strategy
API Designer Agent	OpenAPI/Swagger or DSL	Route paths, methods, request/response shapes, auth model
Gateway Blueprint	`gateway-blueprint.json`	Auth strategy, routing mode, rate limits, multi-tenant headers
Edition Definition	`edition.json`	Tier-based access control (routes, quotas, limits)
Template Metadata	`template.json`	Parameters, optional files, version pinning
Contextual Inputs	Semantic Kernel planner memory	Tenant ID strategy, service boundaries, previous failures

📐 Example: API Designer Output¶

{
  "apiName": "Vetspire.Appointments",
  "version": "1.0.0",
  "routes": [
    {
      "path": "/appointments",
      "method": "GET",
      "auth": "jwt",
      "requiredScope": "appointments.read"
    },
    {
      "path": "/appointments/{id}",
      "method": "DELETE",
      "auth": "jwt",
      "requiredScope": "appointments.delete"
    }
  ]
}

🧱 Gateway Blueprint Structure¶

{
  "auth": {
    "type": "jwt",
    "provider": "OpenIddict"
  },
  "tenantResolution": {
    "strategy": "header",
    "headerName": "X-Tenant-ID"
  },
  "rateLimits": {
    "enabled": true,
    "strategy": "perRoutePerTenant"
  },
  "observability": {
    "tracing": true,
    "metrics": true,
    "structuredLogging": true
  }
}

🧠 Planner-Defined Flags¶

Flag	Effect
`useRateLimit`	Injects `RateLimitMiddleware.cs` with policy map
`useEditionTiering`	Adds edition-aware access controls
`useTenantIsolation`	Enables `TenantContext.cs` and per-tenant routing
`generateReadme`	Triggers automatic `README.md` and `gateway.routes.md` output
`useChaosResilience`	Injects test route with retry + chaos monkey support

📦 Template Input Mapping¶

Agent maps the above inputs to dotnet new template symbols:

CLI Flag	Mapped Input
`--authType jwt`	`auth.type = "jwt"`
`--tenantHeader X-Tenant-ID`	`tenantResolution.headerName`
`--useRateLimit true`	`rateLimits.enabled = true`
`--useChaos true`	triggers chaos route generation

📁 Optional External Inputs¶

Input	Use
`api-gateway.route-extensions.json`	Append extra headers, enrichments
`shared-config.json`	Token endpoint, JWKS URI, standard headers
`plan.json`	Planner-level DSL for microservice exposure logic

🧠 Memory Recall Integration¶

If agent was previously invoked for this API or edition:

Pulls last generated gateway config (for diffing)
Injects version history for rollback/resilience
Adjusts tenant headers, scopes, auth strategy based on known defaults

📤 Outputs – Gateway Project, Config, Plugins, Docs, Pipelines¶

🎯 Purpose¶

This section defines the artifacts produced by the API Gateway Generator Agent. These outputs are structured to deliver a fully functional .NET Core-based API Gateway solution with complete observability, extensibility, documentation, and deployment readiness.

🏗️ Core Generated Output Structure¶

📁 ApiGateway.Vetspire.Appointments/
├── ApiGateway.Vetspire.Appointments.csproj
├── Program.cs
├── Startup.cs
├── GatewayHost.cs
├── RouteRegistry.cs
├── Auth/
│   ├── JwtValidationMiddleware.cs
│   └── ApiKeyHandler.cs
├── Tenancy/
│   ├── TenantResolver.cs
│   └── TenantContext.cs
├── Policies/
│   ├── RateLimiter.cs
│   ├── RetryPolicy.cs
│   └── CircuitBreaker.cs
├── Observability/
│   ├── SerilogConfig.cs
│   ├── MetricsExporter.cs
│   └── TracingSetup.cs
├── Plugins/
│   └── IRouteFilter.cs
├── Configuration/
│   ├── routes.json
│   └── gateway-settings.json
├── Docs/
│   ├── gateway.routes.md
│   └── README.md
├── Tests/
│   ├── RouteTests.cs
│   └── AuthTests.cs
├── CI/
│   └── azure-pipelines.yml
└── version.json

📦 Main Output Categories¶

Category	Outputs
Gateway Project	`.csproj`, `Program.cs`, `Startup.cs`, DI setup, routing middleware
Auth & Security	JWT validation, API Key handler, tenant resolution strategy
Routing	`RouteRegistry.cs`, `routes.json`, OpenAPI-consistent mapping
Policies	Resilience middleware, circuit breakers, retry, rate limiters
Plugins	Extensible `IRouteFilter`, `IRequestTransformer`, pluggable handlers
Observability	Logging config, metrics exports, OpenTelemetry setup
Configuration	Declarative `gateway-settings.json`, `EditionPolicy.json`
Docs	Auto-generated README, route docs, config summary
Pipelines	CI/CD YAML with validation, build, test, container push
Versioning	`version.json` for tracking build metadata and traceability

📋 Example: `version.json`¶

{
  "gateway": "ApiGateway.Vetspire.Appointments",
  "version": "1.0.0",
  "template": "ConnectSoft.GatewayTemplate@2.2.0",
  "build": "2025-06-14T13:22:00Z",
  "authType": "jwt",
  "rateLimit": true,
  "multiTenant": true
}

📄 Documentation Artifacts¶

File	Purpose
`README.md`	Overview of gateway functionality, architecture, usage instructions
`gateway.routes.md`	List of all generated routes, methods, authorization rules
`Docs/edition-policies.md`	Lists tiered access by edition
`Docs/observability.md`	Explains metrics/traces/logging configuration

🧪 Test and QA Outputs¶

Test File	Description
`RouteTests.cs`	Validates each route maps to correct downstream
`AuthTests.cs`	Ensures proper JWT validation / rejection cases
`RateLimitTests.cs`	Simulates quota and burst conditions

🧵 CI/CD Integration¶

Output	Description
`azure-pipelines.yml`	Multi-stage CI/CD: restore → build → test → pack → publish
`build.ps1`	Local development support script
`Dockerfile`	Optional generation for containerized deployment
`bicep/terraform`	Optional IaC generation for staging gateways

🧠 Knowledge Base – Archetypes, Shared Policies, Domain Boundaries¶

🎯 Purpose¶

This section defines what the API Gateway Generator Agent already knows at execution time — its embedded knowledge base and predefined architectural archetypes, including:

Domain-aligned gateway types
Shared authentication and routing policies
Multi-tenant design contracts
Resilience and observability defaults

These form the cognitive backbone for accurate and standards-compliant gateway generation.

🧩 Gateway Archetypes (Types)¶

Archetype	Description	Used When
Public Edge Gateway	Internet-facing, secured by OAuth2, API keys, and CORS	For external SaaS APIs
Internal Reverse Proxy	Authenticated by token relay or service identity	For internal service-to-service calls
Tenant BFF Gateway	Backend-for-frontend for a specific tenant or app	For UI-driven flows, tailored to editions
Multi-Host Gateway	Handles routing across tenant subdomains	For white-label or custom tenant domains

These are aligned to product blueprints and selected by the Planner Agent or Architect Agent.

🧰 Built-in Shared Policies¶

The agent knows how to inject and scaffold the following shared platform-level policies:

Policy	Location	Notes
JWT validation	`JwtValidationMiddleware.cs`	Validates issuer, audience, scopes
API key validation	`ApiKeyHandler.cs`	Can be per route or global
Rate limiting	`RateLimiter.cs`	Configurable burst + window per tenant
Retry & circuit breaker	`Resilience.cs`	Based on transient fault strategy
Edition gating	`EditionGateMiddleware.cs`	Injected from `edition.json`
Chaos monkey	`ChaosPolicy.cs`	Controlled via flags and testing env only

🧠 Domain Boundary Knowledge¶

Knowledge Source	Use
`api-designer-agent` output	Infers domain, bounded context
Gateway naming convention	`ApiGateway.{BoundedContext}`
Downstream service map	Maps routes to microservice names
Shared headers	Applies platform-wide headers like `X-Tenant-ID`, `X-Edition-ID`

📖 Tenant Isolation Strategy Matrix¶

Strategy	Implementation
Header	Uses `X-Tenant-ID`, extracted via middleware
Token Claims	Reads `tenant_id` from JWT claims
Subdomain	Optional: parses tenant from host header
Fallback	Defaults to “anonymous” or denies access

This matrix is pre-baked in the agent’s memory and dynamically adjusted by planner or input prompt flags.

📚 Semantic Patterns Known¶

Pattern	Description
`Route → Scope → Policy → Retry`	The core enforcement pipeline for each endpoint
`PathGroup → EditionRules`	Tier gating at method or path level
`ServiceName → RoutePrefix`	Auto-alignment of microservice to URL base path
`CustomPlugin → HookPoint`	Allows for structured plugin registration per phase

📁 Memory-Aware Components¶

The agent retains and reuses:

Known route patterns (/v1/*, /health, etc.)
Known gateway IDs and API namespace prefixes
Previously used editions and policy combinations
Retry logs and overrides from failed generations

🔄 Process Flow – Generation Stages, Validation, Retry Points¶

🎯 Purpose¶

This section breaks down the step-by-step internal flow the API Gateway Generator Agent follows from invocation to artifact completion — including intermediate decisions, validation hooks, and retry handling logic.

This deterministic flow ensures predictable and safe gateway generation for any API interface or bounded context.

🧭 High-Level Generation Phases¶

graph TD
    A[Agent Invocation] --> B{Load Inputs}
    B --> C[Validate API Contracts]
    C --> D[Initialize Template Parameters]
    D --> E[Scaffold Gateway Project]
    E --> F[Inject Routing & Auth Middleware]
    F --> G[Inject Policies, Plugins, Observability]
    G --> H[Generate Configs, Docs, CI/CD]
    H --> I[Validate Structure and Semantics]
    I --> J{Retry Needed?}
    J -- Yes --> D
    J -- No --> K[Emit Final Artifacts]
    K --> L[Return Output to Planner / Orchestrator]

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⚙️ Detailed Steps¶

Step	Description
1️⃣ Load Inputs	Loads API contract, planner intent, gateway blueprint, template metadata
2️⃣ Validate Contracts	Ensures all routes, methods, and schemas are consistent and mappable
3️⃣ Initialize Template Context	Sets up internal state: flags, defaults, known plugin list
4️⃣ Project Scaffold	Executes custom `dotnet new` template for `ApiGateway.*` solution
5️⃣ Route + Auth Injection	Builds routing tables and embeds JWT/API key validation flows
6️⃣ Policy Layering	Adds per-route rate limits, retries, circuit breakers, and tenant isolation
7️⃣ Observability and Plugins	Adds telemetry pipeline, metric exporters, plugin scaffolding
8️⃣ Docs and CI/CD	Generates README, route map, Azure DevOps YAML, and Dockerfile
9️⃣ Validation Phase	Runs static structure checks, simulation of routing plan, test generation
🔁 Retry Loop	If validation fails, reruns template generation with adjusted inputs or flags
✅ Emit Outputs	Final gateway files, docs, version metadata are returned for registration and deployment

🧪 Validation Types¶

Type	Validator
Structural	Missing folders, duplicate routes, invalid symbols
Semantic	Route-to-service match, scope presence, conflicting headers
Observability	Missing metric hooks, untraced routes
Security	Auth mismatch (route says JWT but policy absent), missing edition gates
Build Check	Ensures project compiles locally (`dotnet build`) before emit
Test Scaffolding	Ensures at least 1 test per route class is emitted if test flag is true

🧠 Retry Logic¶

Failure Class	Retry Behavior
Missing scope mapping	Retry with `defaultScope` fallback
Invalid edition map	Retry with full plan exposure unless `--strictEdition=true`
Auth misalignment	Retry by removing `route.auth: required` if `--failOnAuthMismatch=false`
Plugin resolution error	Retry with `pluginFallback = NoOp`

Retries are traceable, memoized in logs, and version-stamped per generation.

🔁 Retry Decision Tree¶

flowchart TD
    Validate --> InvalidAuth[Missing Auth Strategy]
    InvalidAuth --> Retry1[Retry with default: JWT]
    Retry1 --> Validate

    Validate --> MissingEdition[Unmapped Edition]
    MissingEdition --> Retry2[Retry with Basic Access]
    Retry2 --> Validate

    Validate --> Pass[All OK]

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🛠 Technologies and Stack Integration – .NET 8, Plugins, Middleware, Telemetry¶

🎯 Purpose¶

This section defines the technical foundation and framework choices behind the gateway generator’s emitted output. It ensures generated gateways are consistent with ConnectSoft standards for clean architecture, plugin extensibility, and full observability — all within a .NET 8 custom gateway stack.

🧱 Core Technologies¶

Technology	Purpose
.NET 8 SDK	Base framework for the API Gateway runtime
ASP.NET Core Web API	Hosts routing engine, middlewares, DI container
Serilog	Structured logging with enrichers and sinks
OpenTelemetry SDK	Tracing (Jaeger/Zipkin compatible), metrics (Prometheus ready)
MassTransit (Optional)	Event-driven messaging for domain events or gateway events
NHibernate / EF Core (Optional)	For plugins needing config persistence
FluentValidation	Used in gateway plugin extensions or policy rules
Azure SDK	KeyVault, AppConfig, etc., depending on planner instructions
Semantic Kernel	Agent-side skill orchestration (not inside gateway runtime)

🧩 Plugin and Policy Framework¶

The custom gateway supports ConnectSoft plugin injection architecture via DI. Generated projects scaffold interfaces and registration patterns for:

Plugin Type	Interface	Purpose
`IRouteFilter`	Pre-route and post-route request modification
`IRequestValidator`	Apply request schema or token validation
`ITenantPolicyProvider`	Inject edition- or tenant-based access rules
`IMetricsObserver`	Observe and emit gateway-level metrics
`IGatewayPlugin`	Marker interface for any injected runtime service

Registered in Startup.cs via reflection scan or explicit DI:

services.Scan(scan => scan
  .FromAssemblyOf<IGatewayPlugin>()
  .AddClasses(classes => classes.AssignableTo<IGatewayPlugin>())
  .AsImplementedInterfaces()
  .WithScopedLifetime());

🔌 Middleware Layers Injected¶

app.UseMiddleware<ExceptionMiddleware>();
app.UseMiddleware<ObservabilityMiddleware>();
app.UseMiddleware<JwtValidationMiddleware>();
app.UseMiddleware<TenantResolverMiddleware>();
app.UseMiddleware<RateLimitMiddleware>();
app.UseRouting();
app.UseEndpoints(...);

Each middleware implements:

ILogger for structured logs
ActivitySource for tracing
IMetricsEmitter or custom Prometheus exporter for metrics

📦 Generated Solution Patterns¶

File	Stack Role
`Program.cs`	Minimal hosting model using `.NET 8`
`Startup.cs`	Optional legacy mode for plug-and-play policies
`RateLimitMiddleware.cs`	Built on `MemoryCache` or `IMeter`
`TracingSetup.cs`	OpenTelemetry `ActivitySource` scoped per request
`MetricsExporter.cs`	Prometheus-compatible metric emitter
`AuthMiddleware.cs`	Token handler with fallback, claims enrichment
`ObservabilityMiddleware.cs`	Adds `X-Trace-Id`, logs latency, errors

📊 Observability Tools¶

Integration	Detail
Serilog	Console, Seq, or Application Insights
Prometheus	`/metrics` endpoint auto-exposed
OpenTelemetry	Exports traces to Jaeger, Zipkin, or Azure Monitor
Correlation Id	Injects and propagates `X-Correlation-ID`, `X-Tenant-ID`

🧪 Test Stack (if `--withTests` enabled)¶

MSTest + FluentAssertions
Moq for service/plugin mocking
Tracing/metrics mocking helpers for OTel

🗂 Project Scaffolding and Folder Layout¶

🎯 Purpose¶

This section defines the standard structure of the emitted .NET 8-based API Gateway project — enabling clean separation of concerns, extensibility, and predictable discovery of plugins, policies, and configuration.

The structure aligns with Clean Architecture principles and is optimized for modularity, testing, and observability.

🧱 Root Structure – Example¶

📁 ApiGateway.Vetspire.Appointments/
├── ApiGateway.Vetspire.Appointments.csproj
├── Program.cs
├── Startup.cs
├── Properties/
│   └── launchSettings.json
├── Configuration/
│   ├── routes.json
│   ├── gateway-settings.json
│   └── edition-policy.json
├── Routing/
│   ├── RouteRegistry.cs
│   ├── RouteBuilder.cs
│   └── RoutingConstants.cs
├── Middleware/
│   ├── JwtValidationMiddleware.cs
│   ├── TenantResolverMiddleware.cs
│   ├── RateLimiterMiddleware.cs
│   └── ObservabilityMiddleware.cs
├── Plugins/
│   ├── IRouteFilter.cs
│   ├── PluginRegistry.cs
│   └── ExamplePlugin.cs
├── Policies/
│   ├── CircuitBreaker.cs
│   ├── RetryPolicy.cs
│   └── EditionAccessPolicy.cs
├── Observability/
│   ├── SerilogConfig.cs
│   ├── TracingSetup.cs
│   └── MetricsExporter.cs
├── Docs/
│   ├── gateway.routes.md
│   ├── observability.md
│   └── README.md
├── CI/
│   ├── azure-pipelines.yml
│   └── Dockerfile
├── Tests/
│   ├── AuthTests.cs
│   ├── RouteTests.cs
│   └── PolicyTests.cs
└── version.json

📁 Folder Responsibilities¶

Folder	Responsibility
`Configuration/`	All static and dynamic gateway configuration artifacts
`Routing/`	Classes for building and mapping routes to downstream services
`Middleware/`	All custom `UseMiddleware<T>` components
`Plugins/`	Extensible plugin injection points with discovery support
`Policies/`	Resilience, edition-based access, feature-gating
`Observability/`	Setup and emitters for metrics, traces, logs
`Docs/`	Auto-generated markdown for maintainers, developers, and ops
`CI/`	Build, deploy, and containerization logic
`Tests/`	Unit and integration tests scoped by concern
`Properties/`	Default debug/run profiles

🧩 Code Entry Points¶

File	Role
`Program.cs`	Minimal host setup using `WebApplicationBuilder`
`Startup.cs`	Optional full DI + config registration (legacy support)
`RouteRegistry.cs`	Central place to register all mapped routes
`PluginRegistry.cs`	Discovers and registers all plugin-based extensions
`JwtValidationMiddleware.cs`	Handles token validation pipeline
`TracingSetup.cs`	Initializes OpenTelemetry spans and exporters

🔍 Naming Convention and Package Identity¶

Namespace: ConnectSoft.Gateways.{BoundedContext}
Project: ApiGateway.{Context} (e.g., ApiGateway.Vetspire.Appointments)
Internal class prefixes: Gateway* (e.g., GatewayRoutePolicy, GatewayOptions)

🧠 Dynamic Path Injection¶

During generation:

Folder and class names adapt based on contextName, apiId, editionSupport, etc.
RouteRegistry.cs auto-generates stub methods for each declared route.
Feature folders are included or excluded via template symbol switches (e.g., --withRateLimiter, --withTracing).

🛣 Route Mapping and Path Normalization¶

🎯 Purpose¶

This section details how the agent maps API Designer routes into the gateway's routing infrastructure — transforming them into normalized paths, method-to-service bindings, and injecting required authorization and tenant awareness metadata.

The resulting routes are injected into RouteRegistry.cs and optionally exported to routes.json or OpenAPI-compatible files for downstream agents.

🧩 Route Definition Pipeline¶

The API Gateway Generator Agent:

Receives route definitions from the API Designer Agent or DSL
Normalizes the path structure to ensure consistent format and casing
Applies route-wide metadata: method, scopes, rate limits, edition
Generates route-to-service forwarding code or configuration

🧱 Normalized Route Shape¶

{
  "path": "/v1/appointments/{id}",
  "method": "GET",
  "service": "AppointmentsService",
  "auth": {
    "type": "jwt",
    "scope": "appointments.read"
  },
  "tenantHeader": "X-Tenant-ID",
  "edition": "Pro",
  "rateLimit": "10r/s"
}

🛠 Generated C# Mapping¶

In RouteRegistry.cs:

app.MapGet("/v1/appointments/{id}", async context =>
{
    var result = await _forwarder.ForwardAsync(context, "AppointmentsService");
    return result;
})
.RequireAuthorization("appointments.read")
.WithMetadata(new TenantScope("X-Tenant-ID"))
.WithRateLimit("10r/s")
.WithEditionGate("Pro");

📏 Path Normalization Logic¶

Rule	Purpose
Convert camelCase to kebab-case	`/getAppointmentById` → `/get-appointment-by-id`
Add version prefix	`/appointments` → `/v1/appointments`
Ensure trailing slash consistency	`/path/` and `/path` behave the same
Auto-parameterize ids	`/appointments/{id}` if not already formatted

🔐 Authorization Metadata Injection¶

If the route defines:

"auth": {
  "type": "jwt",
  "scope": "appointments.read"
}

Then the agent injects:

.RequireAuthorization("appointments.read")

The scope name is normalized to match platform naming conventions.

🧬 Edition Gating¶

If route is flagged for edition enforcement:

"edition": "Pro"

The agent wraps the route in:

.WithEditionGate("Pro")

Backed by EditionGateMiddleware, which evaluates tenant claims.

🧪 Route-Level Validations¶

Before emitting each route:

Ensures no duplicate path+method pair exists
Confirms target service alias exists in service map
Checks that required scope exists in OpenIddict catalog
Verifies that edition name is valid (Basic, Pro, Enterprise, etc.)
Confirms tenant routing strategy matches blueprint

📤 Optional Export Formats¶

Format	File	Purpose
JSON	`routes.json`	For external pipeline consumption
Markdown	`gateway.routes.md`	For human-readable summary
YAML	`routes.yaml`	For third-party tooling compatibility
Code	`RouteRegistry.cs`	Executable C# configuration

🔐 Authentication Layer – JWT, API Keys, and Custom Claims¶

🎯 Purpose¶

This section defines how the API Gateway Generator Agent embeds authentication logic into the generated gateway — ensuring that each route enforces the proper token validation strategy and scopes while supporting multi-strategy fallback (e.g., JWT or API Key).

🔐 Supported Authentication Modes¶

Mode	Description	Used When
JWT (OAuth2)	Validates bearer token issued by OpenIddict	Standard for SaaS APIs
API Key	Validates key in header/query against known hash/store	For automation, partners
Anonymous	No validation, optionally scoped by edition/plan	Public APIs only
Hybrid	Supports both JWT and API Key with precedence rules	Special use cases

🔧 JWT Validation Middleware¶

Generated class: JwtValidationMiddleware.cs

Responsibilities:

Validates access token signature using OpenIddict discovery
Verifies exp, aud, iss claims
Extracts sub, scope, tenant_id, and edition claims
Optionally enforces scope based on route metadata

app.UseMiddleware<JwtValidationMiddleware>();

🧠 Agent-Known JWT Conventions¶

Claim	Usage
`sub`	User or system identity
`scope`	Required for route access
`tenant_id`	Used by `TenantResolverMiddleware`
`edition`	Used by `EditionGateMiddleware`
`role`	Optional for role-based policy enforcement

These are resolved from the factory-wide OpenIddict setup (via the Identity Server Agent).

🔐 API Key Middleware¶

Generated class: ApiKeyValidationMiddleware.cs

Supports:

API Key in X-API-Key header or apikey query
Key-to-scope mapping via dictionary or configuration
Key rotation support via IApiKeyProvider

app.UseMiddleware<ApiKeyValidationMiddleware>();

🧩 Fallback Flow: Hybrid Auth Mode¶

If both auth.type: jwt and auth.fallback: apikey are defined:

Try JWT validation first
If JWT missing or invalid, check API key
If both fail, return 401

📁 Configured via:¶

{
  "auth": {
    "type": "jwt",
    "fallback": "apikey",
    "jwt": {
      "authority": "https://identity.connectsoft.dev",
      "audience": "vetspire"
    },
    "apikey": {
      "header": "X-API-Key",
      "validKeys": ["abc123", "xyz456"]
    }
  }
}

🔐 Auth Mapping in Route Metadata¶

Property	Description
`auth.type`	`jwt`, `apikey`, or `none`
`requiredScope`	e.g., `appointments.read`, `orders.write`
`roles` (optional)	`admin`, `reader`, etc. for claim matching

Injected into route builder like:

.RequireAuthorization("appointments.read")
.RequireRole("admin");

🧪 Authentication Test Coverage¶

Tests emitted in AuthTests.cs:

Valid token access with correct scope
Rejection with invalid or expired token
API key success/failure
Hybrid mode token/key fallback
Edition and tenant claim checks

🧠 Key Injection via DI¶

Interface	Purpose
`ITokenValidator`	Abstract token validator for unit testing
`IApiKeyProvider`	Provides keys and associated metadata
`IClaimMapper`	Translates claim sets to policy decisions

🛂 Authorization and Edition Gating¶

🎯 Purpose¶

This section defines how the agent enforces access control within the API Gateway — ensuring that each route is guarded not only by authentication, but also by authorization scopes, roles, and ConnectSoft edition-based restrictions (e.g., Free, Pro, Enterprise).

🔐 Route-Level Authorization Enforcement¶

Every route can define:

Property	Meaning
`requiredScope`	OAuth2 scope required to access the route
`roles`	Optional: claim-based role required
`edition`	Minimum edition required to access

The generator translates these into attribute-based or middleware-enforced policies.

app.MapGet("/v1/appointments", ...)
   .RequireAuthorization("appointments.read")
   .WithEditionGate("Pro")
   .WithRoles("admin", "staff");

🧠 Scope Policy Mapping¶

The agent uses convention-based or discovered mappings:

Scope Name	Injected Behavior
`*.read`	HTTP GET
`*.write`	POST/PUT
`*.delete`	DELETE
`*.admin`	Admin-only panels or functions

Supported via .AddPolicy(scope, ...) in Program.cs or Startup.cs.

🧾 Role-Based Access Support¶

If route includes roles array:

{
  "path": "/v1/admin/settings",
  "method": "GET",
  "roles": ["admin", "ops"]
}

Then middleware is injected to validate claims["role"] contains at least one match.

🎯 Edition-Based Gating¶

Feature	Function
`WithEditionGate("Pro")`	Prevents route access unless `edition` claim ≥ Pro
Middleware Class	`EditionGateMiddleware.cs`
Edition Source	Claim `edition`, resolved via OpenIddict token or plugin
Fallback	Optional: route can return 403 with JSON explaining upgrade requirement

📜 Edition Hierarchy (default)¶

["Free", "Basic", "Pro", "Enterprise"]

Sorted and resolved using ordinal strategy or dictionary override from platform config.

🔒 Middleware Chain¶

JwtValidationMiddleware
TenantResolverMiddleware
EditionGateMiddleware
ScopeAuthorizationMiddleware
Route Execution

📁 Configuration Support¶

In edition-policy.json:

{
  "routes": {
    "/v1/reports": "Pro",
    "/v1/billing": "Enterprise"
  },
  "fallbackEdition": "Free"
}

🧪 Edition & Auth Tests (in `PolicyTests.cs`)¶

Test	Description
Valid token with Pro edition → ✅
Valid token with Free edition on Pro route → ❌
Token missing edition claim → fallback or fail
Missing scope → returns 403
Missing role (if required) → returns 403

🧠 Agent Memory & Auto-Fix¶

If a route is defined with auth.type = jwt but no scope:

Agent injects default: scope = {resource}.read
If edition is undefined → injects Free as base edition

🏢 Tenant Isolation and Context Resolution¶

🎯 Purpose¶

This section defines how the agent embeds multi-tenant awareness into the generated gateway. It ensures that every request is scoped by tenant — isolating traffic, applying limits, enforcing edition gates, and supporting SaaS and B2B models by default.

🧠 Tenant Resolution Strategies¶

The gateway supports pluggable tenant identification, resolved at runtime through one of the following:

Strategy	Source	Middleware
Header	`X-Tenant-ID` (or configurable)	`TenantResolverMiddleware.cs`
JWT Claim	`tenant_id` in bearer token	Extracted by `JwtValidationMiddleware`
Subdomain	`{tenant}.api.connectsoft.dev`	`HostTenantParser.cs` (optional)
API Key Metadata	Mapped to tenant in key store	Injected via `IApiKeyProvider`

These can be layered or combined depending on blueprint inputs.

🧱 Middleware Injection¶

app.UseMiddleware<TenantResolverMiddleware>();

Class: TenantResolverMiddleware.cs

Function:

Resolves tenant ID from configured source
Stores in HttpContext.Items["TenantId"]
Logs, traces, and passes through for metrics
Optionally validates tenant existence via ITenantValidator

🔀 Routing with Tenant Awareness¶

Generated routing entries include tenant context:

app.MapPost("/v1/orders", ...)
   .WithTenantPartitioning("Header:X-Tenant-ID");

Or:

[RequiresTenant]
[Route("v1/orders")]
public IActionResult CreateOrder(...) { ... }

📜 Configuration Support¶

From gateway-settings.json:

{
  "tenancy": {
    "resolution": "header",
    "headerName": "X-Tenant-ID",
    "required": true
  }
}

Or via prompt flags:

--tenantStrategy header
--tenantHeader X-Tenant-ID

🛡 Enforcement Behavior¶

Feature	Description
❗ Required	If tenant is missing → 400/403 based on config
🧩 Optional	If `required = false`, fallback to "anonymous" tenant
🔒 Isolation	Tenants cannot access others’ resources or routes
🔄 Metrics	All observability tagged by tenant automatically

📊 Observability Hooks¶

Tenant ID is injected into:

Serilog LogContext
OpenTelemetry Activity (as tenant_id attribute)
Prometheus metrics (via labels["tenant"])

This enables tenant-specific dashboards, tracing, and quota analysis.

🔧 Plugin Extension Points¶

Interface	Purpose
`ITenantResolver`	Custom resolution logic (e.g., encrypted headers)
`ITenantPolicyProvider`	Applies tenant-specific rate limits, plugin toggles
`ITenantValidator`	Confirms existence and state (active/inactive)

🧪 Tenant Tests (in `TenantTests.cs`)¶

Test	Description
Valid header → tenant resolved ✅
Missing tenant header → 403 ❌
Conflicting header + token claim → fail or warn
Subdomain resolution → parses tenant name
Invalid tenant → returns 404 or customizable error

🚦 Rate Limiting and Quotas¶

🎯 Purpose¶

This section explains how the API Gateway Generator Agent enforces per-tenant, per-route, or per-edition quotas and throttling policies in the generated gateway — ensuring fairness, platform protection, and SaaS plan enforcement.

🛡 Supported Rate Limit Strategies¶

Strategy	Description	Use Case
Per-Tenant	Each tenant has independent quota (e.g., 100 req/min)	Standard for multi-tenant SaaS
Per-Route	Different endpoints have custom thresholds	Expensive or admin APIs
Per-Edition	Pro tenants get higher limits than Free	Tier-based plans
Global	Fixed total cap across gateway	Traffic protection in emergencies

🧱 Middleware and Configuration¶

Generated Middleware: RateLimiterMiddleware.cs

Injected via app.UseMiddleware<RateLimiterMiddleware>();
Uses in-memory or distributed store (Redis, optionally)
Per-request evaluation based on context

app.MapPost("/v1/payments", ...)
   .WithRateLimit("25r/m", "tenant");

⚙️ Configuration Format¶

Defined in gateway-settings.json or DSL:

{
  "rateLimits": {
    "default": "100r/m",
    "perRoute": {
      "/v1/payments": "25r/m",
      "/v1/reports": "10r/m"
    },
    "perEdition": {
      "Free": "60r/m",
      "Pro": "200r/m",
      "Enterprise": "1000r/m"
    }
  }
}

🔁 Runtime Token Bucket or Sliding Window¶

Implementation supports:

Token bucket algorithm
Sliding window counter
Burst handling (burst: 5)

🧩 Resolution Logic¶

For each request:

Resolve tenant_id
Determine route and edition
Match against perRoute, perTenant, perEdition rules
Apply strictest rule or fail if over quota

If match fails:

Return 429 Too Many Requests
Include Retry-After header

📊 Observability Integration¶

Emits:

rate_limit.exceeded logs
Prometheus counter: gateway_rate_limit_exceeded_total{tenant, route}
Trace event: RateLimitDroppedRequest

🧪 Example Test Case¶

[TestMethod]
public async Task Tenant_Should_Be_Rate_Limited_If_Exceeding_Quota()
{
    // Simulate 101 requests in 60 seconds
    // Expect final response to be 429
}

🔧 Feature Flags and Prompt Symbols¶

Prompt	Description
`--useRateLimit`	Enables rate limiting
`--rateStrategy edition`	Uses edition-specific quotas
`--rateBurst 5`	Enables burst tokens
`--failOnRateExceed false`	Optional soft cap (logs instead of blocking)

💡 Plugin Extension¶

Interface	Function
`IRateLimitProvider`	Can load limits from DB or API
`IRateLimitStrategy`	Switch algorithms (leaky bucket, token bucket)

♻️ Retry Policy, Circuit Breakers, and Resilience¶

🎯 Purpose¶

This section defines how the agent enables fault-tolerance and graceful degradation in the generated API Gateway. It scaffolds mechanisms to automatically retry, fail fast, or fallback based on downstream service behavior, preventing cascading failures and improving platform reliability.

🔁 Retry Strategy¶

Feature	Description
Transient fault retry	Retries failed downstream calls (e.g., HTTP 5xx, timeouts)
Configurable max attempts	Usually 2–3 retries
Exponential backoff	Optional with jitter
Scoped per route	E.g., retry payments but not file uploads

🛑 Circuit Breaker Strategy¶

Feature	Description
Per-route or per-service circuit	Detects repeated failures and opens the circuit
Open/half-open states	Based on rolling window of failures
Fail-fast logic	Short-circuits requests to avoid further pressure
Recovery timer	Periodically attempts to resume traffic

⚙️ Middleware and Policy Injection¶

Generated Classes:

RetryPolicyMiddleware.cs
CircuitBreakerMiddleware.cs

Injected in the pipeline:

app.UseMiddleware<RetryPolicyMiddleware>();
app.UseMiddleware<CircuitBreakerMiddleware>();

Policies are applied based on route annotations or config.

🧾 Configuration Example¶

{
  "resilience": {
    "retry": {
      "default": {
        "maxAttempts": 3,
        "backoff": "exponential",
        "jitter": true
      },
      "perRoute": {
        "/v1/payments": {
          "maxAttempts": 2
        }
      }
    },
    "circuitBreaker": {
      "threshold": 5,
      "duration": "30s",
      "reset": "60s"
    }
  }
}

🔁 Route Example with Resilience Metadata¶

app.MapPost("/v1/orders", ...)
   .WithRetryPolicy(attempts: 3)
   .WithCircuitBreaker(threshold: 5, duration: TimeSpan.FromSeconds(30));

🧩 Metrics Emitted¶

Metric	Description
`gateway_retry_attempts_total`	Number of retries per route/tenant
`gateway_circuit_open_total`	Circuit open events
`gateway_circuit_half_open_total`	Probing
`gateway_circuit_closed_total`	Recovery events

Tagged by:

route
tenant
service

🔧 Plugin Interfaces¶

Interface	Purpose
`IRetryPolicyStrategy`	Override default retry logic (e.g., constant backoff)
`ICircuitBreakerProvider`	Define external thresholds or toggle breakers
`IFallbackHandler`	Provide degraded behavior or cache fallback

🧪 Test Coverage¶

Test	Description
Simulate 3 transient failures → retry succeeds
Force circuit open → next call blocked
Wait recovery → circuit half-opens and resumes
Jitter and delay respected in backoff

🧠 Prompt Symbols¶

Flag	Effect
`--withRetry`	Enables retry scaffolding
`--retryMax=3`	Set max attempts
`--withCircuitBreaker`	Enables breaker
`--cbThreshold=5`	Set failure threshold
`--cbDuration=30s`	Breaker open duration

🔌 Plugin Architecture and Extensibility¶

🎯 Purpose¶

This section explains how the generated API Gateway supports modular extensibility via a structured plugin architecture — allowing the platform or downstream teams to plug in behavior at runtime without modifying core code.

This is crucial for scaling across domains, injecting observability, modifying behavior per tenant or edition, and supporting external integration.

🧱 Core Plugin Architecture Concepts¶

Concept	Role
Plugins	Self-contained components injected at specific lifecycle points
Hook Points	Extension interfaces invoked during request pipeline or route resolution
Registry	Automatically discovers and registers plugins via DI
Isolation	Plugins have scoped access, no cross-plugin interference

📁 Folder Structure¶

/Plugins/
├── IGatewayPlugin.cs
├── IRouteFilter.cs
├── IResponseEnricher.cs
├── PluginRegistry.cs
├── MetricsEnrichmentPlugin.cs
├── TenantAuditPlugin.cs

🧩 Supported Plugin Interfaces¶

Interface	Hook Point	Description
`IGatewayPlugin`	Global	Marker for discovery
`IRouteFilter`	Pre-routing	Modify or validate route requests
`IResponseEnricher`	Post-routing	Inject headers, telemetry, mutation
`IMetricsObserver`	Tracing	Export custom metrics or spans
`IAuthorizationAugmentor`	Auth	Extend claims or access checks
`ITenantPolicyProvider`	Multi-tenancy	Inject tenant/edition-specific logic
`ICustomRateLimiter`	Rate limiting	Override quota logic per tenant

🔁 Plugin Lifecycle¶

sequenceDiagram
    participant Client
    participant Gateway
    participant Plugin as CustomPlugin
    Client->>Gateway: HTTP Request
    Gateway->>Plugin: OnRouteMatch
    Plugin-->>Gateway: Modified request (optional)
    Gateway->>Plugin: OnAuthorize
    Plugin-->>Gateway: Auth decision
    Gateway->>Service: Forwarded call
    Gateway->>Plugin: OnResponse
    Plugin-->>Gateway: Add telemetry, headers
    Gateway-->>Client: HTTP Response

Hold "Alt" / "Option" to enable pan & zoom

⚙️ Plugin Registration¶

In PluginRegistry.cs:

services.Scan(scan => scan
    .FromAssemblyOf<IGatewayPlugin>()
    .AddClasses(classes => classes.AssignableTo<IGatewayPlugin>())
    .AsImplementedInterfaces()
    .WithScopedLifetime());

This ensures zero manual DI for new plugins.

🧪 Example Plugin¶

public class TenantAuditPlugin : IRouteFilter
{
    public async Task InvokeAsync(HttpContext context)
    {
        var tenant = context.GetTenantId();
        Log.Information("Routing request for tenant {Tenant}", tenant);
        await Task.CompletedTask;
    }
}

🧰 Plugin Use Cases¶

Plugin	Use Case
`ResponseEnricher`	Inject latency headers
`IRateLimiter`	Dynamic quota by time of day
`AuthorizationAugmentor`	Validate feature flags or AB test groups
`ITenantPolicyProvider`	Adjust circuit breaker strategy per tenant

🧠 Prompt Support¶

Flag	Description
`--withPlugins`	Enables plugin support
`--pluginTypes=metrics,audit`	Includes prebuilt plugins
`--customPluginHook IMyPlugin`	Scaffold new hook

📊 Observability of Plugins¶

Plugins can:

Emit logs via Serilog
Register custom OpenTelemetry spans
Export metrics to Prometheus using injected IMeter

📡 Observability and Tracing¶

🎯 Purpose¶

This section outlines how the generated API Gateway is equipped with full observability-first instrumentation — including structured logging, distributed tracing, and metrics export — to support platform SREs, DevOps, and AI agents in diagnostics, QoS analysis, and health monitoring.

Observability is embedded by default in every request lifecycle.

📚 Observability Pillars¶

Pillar	Tooling	Output
Logs	Serilog	Structured logs to console, files, Seq, or Azure
Metrics	OpenTelemetry + Prometheus	Request count, duration, rate limits, failures
Traces	OpenTelemetry + Jaeger/Zipkin	Full span tree for each request path

🧱 Middleware Stack¶

app.UseMiddleware<ObservabilityMiddleware>();
app.UseMiddleware<TracingMiddleware>();
app.UseMiddleware<RateLimiterMiddleware>();

Generated middleware includes:

Activity start/stop hooks
Correlation ID propagation
Tenant and route tagging
Automatic failure detection

📜 Log Format¶

{
  "timestamp": "2025-06-14T10:30:12Z",
  "level": "Information",
  "message": "Handled request",
  "tenant": "vetspire",
  "route": "/v1/appointments",
  "durationMs": 87,
  "status": 200,
  "traceId": "01F7YQ...",
  "edition": "Pro"
}

Generated using Serilog with enrichers:

X-Tenant-ID
X-Edition-ID
X-Correlation-ID

📊 Metrics Exposed¶

Prometheus-compatible /metrics endpoint:

Metric	Labels
`gateway_requests_total`	`method`, `route`, `status`, `tenant`, `edition`
`gateway_latency_seconds`	Histogram: `le`, `route`, `status`
`gateway_rate_limit_exceeded_total`	`route`, `tenant`
`gateway_plugin_errors_total`	`plugin`, `route`
`gateway_auth_failure_total`	`method`, `auth_type`, `reason`

🌐 Distributed Tracing¶

Each request generates a trace tree:

graph LR
    A[StartSpan: Incoming Request] --> B[Middleware: JWT]
    B --> C[RouteMatch Span]
    C --> D[DownstreamCall: OrdersService]
    D --> E[PluginHook: Audit]
    E --> F[Return Span]

Hold "Alt" / "Option" to enable pan & zoom

Using ActivitySource from OpenTelemetry.Trace.

Traces are:

Exported to Jaeger, Zipkin, or Azure Monitor
Correlated via traceparent and baggage headers
Scoped per tenant, route, plugin

🔧 Configuration¶

In gateway-settings.json:

{
  "observability": {
    "enableTracing": true,
    "traceExporter": "jaeger",
    "metricsExporter": "prometheus",
    "logLevel": "Information",
    "enrich": ["tenant", "edition", "traceId"]
  }
}

📁 File Outputs (Optional)¶

observability.md: Human-readable doc of all injected telemetry
tracing.json: Sample trace structure
metrics.yaml: Describes exposed metrics with expected values

🧪 Tests¶

Test	Description
Trace emitted with route & tenant tags
Metrics endpoint exposes latency histogram
Logs include correlation ID for every request

🧠 Observability Prompt Flags¶

Flag	Description
`--withObservability`	Enable all layers
`--traceExporter=jaeger`	Set tracing backend
`--logEnrich=tenant,traceId`	Customize log fields
`--prometheusPort=9191`	Expose metrics on custom port

📘 API Documentation and Route Manifest¶

🎯 Purpose¶

This section explains how the agent emits self-describing documentation for the generated gateway, including a structured Route Manifest, OpenAPI-compatible exports, and developer-oriented markdowns.

This ensures:

Gateway consumers (internal/external) know what is exposed
Edition-specific route restrictions are visible
QA and Ops can validate route behaviors before deploy

📁 Output Artifacts¶

File	Purpose
`gateway.routes.md`	Human-readable table of all routes
`routes.json`	Machine-readable manifest
`routes.openapi.json`	Optional OpenAPI export
`route-version.map`	Maps endpoints to supported API versions
`docs/observability.md`	Describes all observability hooks
`docs/plugins.md`	Lists registered plugins and their scope

📑 Markdown Output (`gateway.routes.md`)¶

Generated content (per route):

Path	Method	Auth	Scope	Edition	Rate Limit
`/v1/appointments`	GET	✅ JWT	`appointments.read`	Free	100/min
`/v1/reports/export`	POST	✅ JWT + APIKey	`reports.write`	Pro	10/min

Includes annotations:

❗ = Requires Auth
💎 = Pro+ Only
🔁 = Retry-enabled
🧩 = Plugin extended

🧬 routes.json Example¶

[
  {
    "path": "/v1/appointments",
    "method": "GET",
    "auth": "jwt",
    "scope": "appointments.read",
    "edition": "Free",
    "rateLimit": "100r/m",
    "version": "v1"
  },
  {
    "path": "/v1/reports/export",
    "method": "POST",
    "auth": "jwt+apikey",
    "scope": "reports.write",
    "edition": "Pro",
    "rateLimit": "10r/m",
    "plugins": ["AuditPlugin", "MetricsPlugin"]
  }
]

This is consumed by:

QA agents for test generation
Documentation tools (render as table)
Deployment pipeline for policy syncing

🔍 OpenAPI Export (Optional)¶

Flag: --emitOpenApi

Generates routes.openapi.json using Swashbuckle-style schema
Supports tags, descriptions, response codes
Edition and auth shown in extensions:

"x-edition": "Pro"

🧠 Prompt Symbols¶

Flag	Description
`--withDocs`	Enables markdown and JSON manifest output
`--emitOpenApi`	Adds Swagger-style schema
`--docFormat=md,json,yaml`	Choose output formats
`--docOut=docs/routes/`	Specify folder location

🔧 Extension Points¶

Plugin Hook	Purpose
`IRouteDocEnhancer`	Inject descriptions, deprecation flags
`IApiDocTransformer`	Generate alternative formats (PDF, Confluence)

🧪 QA Use Cases¶

Validate edition locks per route
Detect missing auth for sensitive endpoints
Match OpenIddict scopes to expected resources
Diff routes.json in CI/CD for changes

📈 Metrics¶

Routes emitted count
Authenticated vs anonymous routes
Coverage by edition

🩺 Health Checks, Status Pages, and Gateway Readiness¶

🎯 Purpose¶

This section defines how the generated gateway includes health endpoints, readiness probes, and liveness indicators. These endpoints allow platform orchestrators, human operators, and AI agents to assess whether the gateway is operational, degraded, or unhealthy.

They are structured for compatibility with:

Kubernetes probes
Azure App Service health check path
ConnectSoft SRE tools

🧪 Health Endpoints Included¶

Path	Purpose	Type
`/healthz`	Liveness check	HTTP 200 = healthy
`/readyz`	Readiness check	Validates internal DI, service maps, policies
`/status`	Human-readable HTML or JSON summary	Runtime diagnostics

🔧 Implementation¶

Generated using .NET Health Checks with:

IHealthCheck implementations
Custom middleware for status formatting
Registration via DI pipeline

services.AddHealthChecks()
    .AddCheck<GatewayPolicyHealthCheck>("GatewayPolicies")
    .AddCheck<TenantRegistryHealthCheck>("TenantRegistry")
    .AddCheck<PluginHealthCheck>("Plugins");

🧩 Example Output – `/healthz`¶

{
  "status": "Healthy",
  "results": {
    "GatewayPolicies": { "status": "Healthy" },
    "PluginRegistry": { "status": "Healthy" },
    "TenantMap": { "status": "Degraded", "description": "Some tenants missing configs" }
  }
}

Supports Healthy, Degraded, Unhealthy
Returns 503 on Unhealthy, customizable on Degraded

🛠 Readiness Dependencies¶

Plugin registry initialized
Tenant + edition maps valid
Downstream route targets parse successfully
Tracing and metrics exporters are initialized

All must pass for /readyz to return 200.

🧾 Human Status Page – `/status`¶

If --withStatusPage flag is used, a simple HTML or JSON page is added:

{
  "gateway": "ApiGateway.Vetspire.Appointments",
  "environment": "Production",
  "uptime": "4d 21h 32m",
  "version": "1.0.0",
  "routes": 42,
  "observability": {
    "tracing": "Jaeger",
    "metrics": "Prometheus"
  }
}

Useful for:

Human operators
Ops dashboards
Snapshot comparisons in test environments

🧠 Prompt Flags¶

Flag	Description
`--withHealth`	Enables `/healthz` and `/readyz`
`--healthProbes k8s`	Injects Kubernetes annotations or YAML
`--statusPage html`	Adds `/status` endpoint
`--failOnDegraded true`	Forces readiness probe failure on degraded services

📊 Observability Integration¶

Metric	Description
`gateway_healthcheck_failures_total`	Labelled by probe and failure type
`gateway_status_last_refresh`	Uptime and environment tracking
`gateway_degraded_services`	Count of degraded but available components

🧪 Tests Included¶

Test	Description
Healthcheck returns 200	When all services OK
Readiness fails	When tenant config missing
Plugin health degrades status	When plugin registration throws
`/status`	Returns expected fields with runtime details

⚙️ Configuration Model and Edition-Aware Settings¶

🎯 Purpose¶

This section defines how the generated gateway includes a centralized, validated, and edition-aware configuration model. The configuration is:

Fully structured and validated
Supports runtime overrides (env vars, secrets)
Enables edition-specific behaviors at startup and runtime

📁 Files and Structure¶

File	Description
`appsettings.json`	Default configuration
`gateway-settings.json`	ConnectSoft-specific extensions
`appsettings.{env}.json`	Environment-specific overrides
`edition-policy.json`	Defines edition rules and overrides
`secrets.{env}.json` (optional)	API keys, sensitive values (not committed)

🧱 Configuration Domains¶

Section	Purpose
`Routing`	Route-to-service mapping, versions
`Tenancy`	Resolution mode, headers, validation
`Auth`	JWT, API Key, fallback policies
`EditionPolicies`	Route edition access, rate quotas
`Observability`	Logging, tracing, metrics exporters
`Resilience`	Retry, circuit breakers
`RateLimits`	Global, per-tenant, per-edition limits
`Plugins`	Activation and DI of plugins

🧩 Edition-Aware Configuration Support¶

Allows settings to dynamically resolve per edition.

{
  "features": {
    "enableAuditTrail": {
      "Free": false,
      "Pro": true,
      "Enterprise": true
    },
    "rateLimit": {
      "Free": "60r/m",
      "Pro": "250r/m"
    }
  }
}

Generated helper:

public class EditionConfigProvider
{
    public T Get<T>(string key, string edition) => ...;
}

🧠 Environment-Aware Overrides¶

Reads from:

Environment.GetEnvironmentVariable(...)
appsettings.{ENVIRONMENT}.json
Azure App Configuration or Key Vault (if injected)

📦 Strongly-Typed Configuration¶

The gateway uses IOptions<T> and IValidateOptions<T>:

services.Configure<GatewaySettings>(configuration.GetSection("Gateway"));
services.AddSingleton<IValidateOptions<GatewaySettings>, GatewaySettingsValidator>();

Auto-generated settings classes:

GatewaySettings.cs
TenantSettings.cs
AuthSettings.cs

Each includes data annotations for validation:

[Required]
public string JwtAuthority { get; set; }

🔧 Prompt Flags¶

Flag	Description
`--withConfig`	Injects base config + environment overrides
`--editionAware true`	Enables edition-based features
`--configOut=./config/`	Emits config files to specified folder
`--withSecrets`	Adds example `secrets.{env}.json` file
`--azureAppConfig`	Enables Azure App Config integration
`--keyVault`	Enables secret resolution from Key Vault

🧪 Configuration Tests¶

Test	Description
Validate required sections loaded
Edition fallback works as expected
Invalid config file returns detailed startup error
Environment overrides respected

🧠 Self-Documenting Output¶

Optionally generates:

docs/configuration.md: Human-readable summary
docs/editions.md: Edition rules per route and setting

🧬 Edition Feature Enforcement and Feature Flags¶

🎯 Purpose¶

This section details how the API Gateway Generator Agent embeds edition-specific logic and feature flag control, ensuring that each tenant's edition (e.g., Free, Pro, Enterprise) dynamically governs access to routes, behavior toggles, and premium platform capabilities.

The system allows:

SaaS edition control at runtime
Feature enablement per edition or tenant
Dynamic control without redeployment

🧩 Feature Enforcement Flow¶

graph TD
    A[Incoming Request] --> B[Resolve Edition from Claims or Tenant Profile]
    B --> C{Feature Required?}
    C -- Yes --> D{Edition Allows Feature?}
    D -- No --> E[Return 403 Upgrade Required]
    D -- Yes --> F[Proceed with Execution]
    C -- No --> F

Hold "Alt" / "Option" to enable pan & zoom

📜 Feature Flag Definitions (Structured JSON)¶

Stored in edition-feature-flags.json or service-wide config:

{
  "features": {
    "auditTrail": {
      "Free": false,
      "Pro": true,
      "Enterprise": true
    },
    "extendedExport": {
      "Free": false,
      "Pro": false,
      "Enterprise": true
    },
    "realtimeTelemetry": {
      "Pro": true,
      "Enterprise": true
    }
  }
}

🧱 Code-Level Enforcement¶

[RequiresFeature("auditTrail")]
public async Task<IActionResult> ExportAuditLog(...) { ... }

Or inside middleware/plugin:

if (!FeatureEnforcer.Allows("realtimeTelemetry", edition))
    return Results.Forbid("Upgrade to Pro or Enterprise required.");

🧠 Generated Helper Class¶

public interface IFeatureEnforcer
{
    bool Allows(string feature, string edition);
    bool AllowsForTenant(string feature, string tenantId);
    string[] GetAvailableFeatures(string edition);
}

With in-memory, cached, and optional distributed versions.

🔄 Per-Tenant Feature Override Support¶

Tenant profile can override feature matrix:

{
  "tenantId": "vetspire",
  "overrides": {
    "auditTrail": true,
    "realtimeTelemetry": false
  }
}

Resolved at runtime using ITenantFeatureStore.

📦 Plugin & Middleware Integration¶

Plugins can declare features they depend on:

public class AuditPlugin : IGatewayPlugin
{
    public string[] RequiredFeatures => new[] { "auditTrail" };
}

Disabled if feature not present for current tenant/edition.

🧪 Test Cases (FeatureTests.cs)¶

Test	Description
`Pro` tenant allowed to export audit logs
`Free` tenant blocked from `extendedExport`
Tenant with override gets feature even if edition does not
Plugin not registered if feature disabled

📈 Observability Integration¶

Feature decisions logged at debug level
Metrics:
gateway_feature_enabled_total{feature,tenant}
gateway_feature_blocked_total{feature,tenant}

🧠 Prompt Flags¶

Flag	Description
`--withFeatures`	Enables edition-aware feature system
`--featureMatrixFile`	Path to feature config
`--enableFeature auditTrail,realtimeTelemetry`	Predefine active features
`--tenantOverridesFromDb`	Enables dynamic per-tenant overrides

🔀 Plugin-Based Middleware Injection and Runtime Activation¶

🎯 Purpose¶

This section describes how the generated API Gateway supports dynamic middleware injection and runtime activation of plugins — enabling flexible extension, on-demand enablement, and adaptive behavior per tenant, edition, or feature.

This pattern ensures that the gateway can be:

Extended without code changes
Optimized per route or plan
Modular and reactive to SaaS rules

🧩 Middleware Activation Strategy¶

Plugins or middleware can be:

Globally injected (affects all requests)
Route-scoped (enabled only on specific paths)
Feature-controlled (enabled if a feature is active)
Edition-specific (enabled only for Pro/Enterprise)

🧱 Middleware Descriptor Model¶

In plugin-middleware.json or .cs registration:

{
  "plugins": [
    {
      "type": "AuditPlugin",
      "feature": "auditTrail",
      "editions": ["Pro", "Enterprise"],
      "routes": ["/v1/appointments", "/v1/export"]
    },
    {
      "type": "MetricsPlugin",
      "feature": "realtimeTelemetry",
      "global": true
    }
  ]
}

🔧 Generated Registry¶

public class MiddlewareActivator
{
    public void Configure(IApplicationBuilder app, PluginManifest manifest)
    {
        foreach (var plugin in manifest.GetGlobalMiddlewares())
        {
            app.UseMiddleware(plugin.Type);
        }
    }
}

Also supports .UseWhen(...) for route or tenant/edition-based conditional logic.

🧠 Route-Level Middleware Injection¶

app.MapPost("/v1/appointments", ...)
   .WithPlugin<AuditPlugin>()
   .WithFeatureGate("auditTrail")
   .WithEditionGate("Pro");

Or dynamically resolved via reflection from manifest.

💎 Edition and Feature Conditional Activation¶

Each plugin defines:

Property	Purpose
`RequiredFeature`	Tied to edition feature model
`AllowedEditions`	Explicit edition constraints
`EnabledForTenants`	Targeted enablement for selected tenants only

🧩 Extension Point Interfaces¶

Interface	Role
`IPluginActivator`	Determines if plugin should activate
`IMiddlewareResolver`	Dynamically injects into pipeline
`IRouteMiddlewareBinder`	Binds per-route plugin logic
`IFeatureScopedPlugin`	Self-registering plugins gated by feature

🔁 Runtime Toggle Use Case¶

With --enableFeature=tracing:

TracingPlugin is registered dynamically
Bound only to editions supporting tracing
Auto-registered in observability metrics and health checks

📁 Plugin Output¶

File	Description
`plugins.manifest.json`	Final registry of active plugins and hooks
`plugins.lifecycle.log`	Logs lifecycle events, plugin activation/deactivation
`docs/plugins.md`	Markdown summary of plugin capabilities and scopes

📊 Observability and Diagnostics¶

Metric: gateway_plugins_active_total{plugin,tenant,route}
Logs:
- Plugin activation
- Skipped due to edition/feature constraint
- Plugin errors (captured via middleware wrapper)

🧪 Example Test Cases¶

Test	Description
Plugin activates only if feature flag is on
Plugin skipped on Free edition tenant
Plugin injected only for defined routes
Middleware wraps response if active

🧠 Prompt Flags¶

Flag	Description
`--withPlugins`	Enables plugin system
`--pluginManifestPath=./config/plugins.json`	Specifies manifest
`--pluginDynamicActivation`	Enables feature/edition-based injection
`--routeScopedPlugins`	Enables route-bound plugin binding

🛡️ Security Hardening, Headers, and CORS Rules¶

🎯 Purpose¶

This section explains how the API Gateway Generator Agent embeds default security protections and policy-driven controls — ensuring all external API exposure is hardened against common web threats, misconfigurations, and cross-origin issues.

This includes:

Standard security headers
Configurable CORS policies
Edition- and tenant-aware API surface restrictions

🧱 Built-in Security Headers¶

Injected globally via middleware:

Strict-Transport-Security: max-age=63072000; includeSubDomains; preload  
X-Content-Type-Options: nosniff  
X-Frame-Options: DENY  
X-XSS-Protection: 1; mode=block  
X-Download-Options: noopen  
Referrer-Policy: no-referrer  
Content-Security-Policy: default-src 'none';

Middleware injected via:

app.UseMiddleware<SecurityHeadersMiddleware>();

Fully customizable via config.

🌍 CORS Policy Enforcement¶

Supports:

Per-route CORS policy
Edition-aware origin whitelisting
Plugin-based CORS customizers

Example config in gateway-settings.json:

{
  "cors": {
    "default": {
      "allowedOrigins": ["https://*.myapp.com"],
      "allowedMethods": ["GET", "POST"],
      "allowCredentials": true
    },
    "perRoute": {
      "/v1/public/*": {
        "allowedOrigins": ["*"],
        "allowedMethods": ["GET"]
      },
      "/v1/secure/*": {
        "allowedOrigins": ["https://portal.myapp.com"]
      }
    }
  }
}

⚙️ .NET Integration¶

services.AddCors(options =>
{
    options.AddPolicy("SecurePolicy", builder =>
    {
        builder.WithOrigins("https://portal.myapp.com")
               .AllowAnyHeader()
               .AllowAnyMethod()
               .AllowCredentials();
    });
});

Applied via route:

app.MapPost("/v1/orders", ...)
   .RequireCors("SecurePolicy");

🔒 Additional Hardening Options¶

Setting	Description
`enforceHttps`	Forces HTTPS redirects
`blockHttp`	Returns 403 on HTTP requests
`tokenInHeaderOnly`	Rejects bearer tokens in query string
`maxRequestSize`	Rejects payloads exceeding configured limit
`requireContentType`	Rejects requests without `Content-Type` header
`blockUnknownUserAgents`	Optional enforcement for known bots or scanners

All configurable via security block in settings or CLI flags.

🧠 Prompt Flags¶

Flag	Description
`--withSecurity`	Enables all security middlewares
`--withCors`	Enables CORS setup
`--corsOrigins="https://*.myapp.com"`	Sets default origin whitelist
`--corsPublicRoutes="/v1/public/*"`	Whitelist public route set
`--maxRequestSize=2MB`	Injects request size limitation
`--tokenHeaderOnly`	Rejects query token auth

📜 Generated Output¶

File	Purpose
`docs/security.md`	Lists all enforced security headers, auth checks
`cors-policies.json`	Runtime CORS policy manifest
`gateway.rules.audit.log`	Logs all rejected/blocked requests due to security violations

🧪 Test Scenarios¶

Test	Description
CORS preflight returns expected headers
Requests blocked with token in query string
Unknown origin → 403
Large payload rejected with 413
HTTP call redirected to HTTPS

📈 Observability¶

Metrics:

Metric	Labels
`gateway_requests_blocked_total`	reason, route
`gateway_cors_violations_total`	origin, route
`gateway_headers_enforced_total`	policy

🔐 API Key Management and Header Enforcement¶

🎯 Purpose¶

This section describes how the generated API Gateway supports API Key validation, access control based on headers, and metadata injection, enabling secure machine-to-machine integrations, 3^rd-party partner access, and fine-grained multi-tenant enforcement.

🔑 API Key Modes¶

Mode	Use Case
Static Keys	Manually defined for internal use or legacy systems
Per-Tenant Keys	Dynamically resolved for each tenant
Per-Edition Keys	Tiered access: Free users have limited key rights
Scoped Keys	Keys can be scoped to specific routes, scopes, or features

📁 API Key Sources¶

Source	Description
`apikey` header	Standard (preferred)
`X-Api-Key`	Fallback (legacy)
`?apikey=` query param	(Blocked unless explicitly allowed)

Resolved using IApiKeyStore:

public interface IApiKeyStore
{
    Task<ApiKeyValidationResult> ValidateAsync(string key);
}

Backed by:

In-memory dictionary (for static keys)
Redis
Database lookup
Azure App Configuration or Key Vault

🧪 Key Validation Result Model¶

public class ApiKeyValidationResult
{
    public bool IsValid { get; set; }
    public string TenantId { get; set; }
    public string[] AllowedRoutes { get; set; }
    public string Edition { get; set; }
    public string[] Scopes { get; set; }
}

📊 Header Enforcement Logic¶

Scaffolded policies:

Require specific headers for certain routes
Enforce header structure (e.g., correlation IDs, trace headers)
Rejects unknown headers or formats

[RequireHeader("X-Request-Id", Regex = "^[a-zA-Z0-9-]{36}$")]
public async Task<IActionResult> DoSomething(...) { ... }

Route-level or global:

{
  "headerPolicies": {
    "required": ["X-Request-Id", "X-Tenant-Id"],
    "rejectUnknown": false,
    "validatePatterns": {
      "X-Tenant-Id": "^[a-z0-9_-]+$"
    }
  }
}

🔧 Generated Middleware¶

app.UseMiddleware<ApiKeyValidationMiddleware>();
app.UseMiddleware<HeaderValidationMiddleware>();

🧠 Prompt Flags¶

Flag	Description
`--withApiKey`	Enables API key enforcement
`--staticKeys=tenantA:key123;tenantB:key456`	Inline static key mapping
`--apiKeyHeader=X-Api-Key`	Customize API key header
`--requireHeaders=X-Tenant-Id,X-Request-Id`	Global header validation
`--blockApiKeyQuery`	Block `?apikey=` in query param

📜 Output Files¶

File	Purpose
`apikeys.json`	List of valid API keys and metadata
`docs/security/apikeys.md`	Documentation for consumers on how to use API keys
`headers-policy.json`	Enforced header expectations
`gateway-header-violations.log`	Audit log for missing/invalid headers

📈 Metrics¶

Metric	Description
`gateway_apikey_validation_total`	Total validations by tenant and result
`gateway_header_violations_total`	Count of header enforcement failures
`gateway_rejected_query_keys_total`	Count of query-based key attempts

🧪 Test Coverage¶

Scenario	Outcome
Valid key in header → 200 OK
Invalid key → 403 Forbidden
Missing required header → 400 Bad Request
Malformed trace ID → 422 Unprocessable

🧭 Static vs Dynamic Route Discovery and Service Targeting¶

🎯 Purpose¶

This section details how the generated API Gateway handles route discovery, target resolution, and dynamic service mapping — either at code-generation time (static) or runtime (dynamic). This design supports scalable gateway setups across distributed microservices, allowing routes to be declarative or auto-synced from service metadata.

🧱 Route Source Modes¶

Mode	Description	Use Case
Static	Routes hardcoded at generation time using templates	Predictable services
Semi-Dynamic	Read from config or route manifest (`routes.json`)	Simple runtime configurability
Fully Dynamic	Query service registry or mesh for updates	Highly elastic microservice ecosystems

🔁 Static Routing Example (Code-Generated)¶

app.MapGet("/v1/appointments", async context =>
{
    await Proxy.To("http://appointments-svc/v1/appointments");
});

Routing and target are locked during scaffolding.

📜 Dynamic Routing via `routes.json`¶

[
  {
    "path": "/v1/users",
    "method": "GET",
    "target": "http://user-service.internal/api/users",
    "auth": "jwt",
    "edition": "Pro",
    "feature": "userManagement"
  }
]

Loaded at runtime via RouteRegistry service and injected into middleware.

Supports:

Hot reloading via file watchers or APIs
Remote registry fetch (HTTP, Redis, Service Bus)
Change events to invalidate gateway caches

⚙️ Target Resolution Strategies¶

Strategy	Example
Static URL	`"target": "http://orders-svc"`
Tenant-specific target	`"targetByTenant": { "tenantA": "...", "tenantB": "..." }`
Feature-based	`"targetIfFeature": "enableLegacyRouting"`
Azure Function or Logic App	`"target": "https://func.api.com/orders"`
MCP-Resolved Target	`"targetFromMCP": true`

🧩 Generated Routing System¶

Component	Role
`RouteRegistry`	Loads `routes.json` or remote
`RouteTargetResolver`	Computes final service URL
`RouteCache`	Caches resolved routes by edition, tenant, version
`RouteReloadService`	Refreshes routes if config or remote registry changes

🔁 Hot Reload CLI Example¶

curl -X POST http://localhost:5100/routes/reload

Reloads route manifest
Logs diff
Invalidates per-tenant caches

🧠 Prompt Flags¶

Flag	Description
`--withStaticRoutes`	Emits route scaffolding as C#
`--withRouteManifest`	Includes `routes.json` runtime file
`--enableDynamicRouting`	Enables live updates from registry
`--mcpRouteResolution`	Enables dynamic route binding via MCP API

🧪 Test Scenarios¶

Test	Description
Static route → maps to correct target
Edition-specific route → blocked for Free
Dynamic route reload updates target URL
Missing route returns 404 with log span

📈 Metrics¶

Metric	Description
`gateway_routes_loaded_total`	Count of active routes
`gateway_routes_dynamic_reload_total`	Number of reloads
`gateway_target_resolution_failures_total`	Resolution errors
`gateway_target_by_edition_total`	Per-edition routing decisions

⏳ Smart Rate Limiting and Adaptive Quotas¶

🎯 Purpose¶

This section defines how the API Gateway Generator Agent integrates smart rate-limiting middleware, supporting:

Tenant- and edition-specific limits
Route-level and global quotas
Burst control, quota windows, and adaptive penalty strategies
Integration with observability and response shaping (e.g., Retry-After headers)

⚙️ Rate Limiting Modes Supported¶

Mode	Description
Fixed Window	Classic per-minute/hour count
Sliding Window	Smoother bucket-based enforcement
Token Bucket	Allows bursts with refill rate
Dynamic Quota	Based on usage history or plan limits

📜 Example Configuration (JSON)¶

{
  "rateLimits": {
    "default": {
      "limit": 100,
      "window": "1m"
    },
    "perEdition": {
      "Free": { "limit": 60, "window": "1m" },
      "Pro": { "limit": 500, "window": "1m" }
    },
    "perRoute": {
      "/v1/export": { "limit": 10, "window": "10m" }
    }
  }
}

Supports combinations and overrides:

Global defaults
Edition overrides
Route-specific policies
Tenant-specified hard caps

🧱 Middleware Injection¶

app.UseMiddleware<RateLimitingMiddleware>();

Backed by:

IRateLimiterPolicyProvider
IRateLimiterStorage (memory, Redis, Cosmos DB, SQL)

🔁 Adaptive Strategy¶

Supports:

Penalty escalation (e.g., temp bans after repeated violations)
Retry-After header injection
Dynamic quota increase after subscription upgrade (hot reload)
Soft warnings (log only) mode

📦 Storage Backends¶

Backend	Use Case
In-memory	Single-node
Redis	Distributed multi-node
Azure Cosmos DB	Persistent + multi-region
SQL	Admin-friendly analytics

All storage backends support shared interfaces:

public interface IRateLimiterStorage
{
    Task<bool> TryConsumeAsync(string key, int count, TimeSpan window);
}

📊 Headers Injected¶

Header	Description
`X-RateLimit-Limit`	Max allowed requests
`X-RateLimit-Remaining`	Remaining tokens
`X-RateLimit-Reset`	Time when window resets
`Retry-After`	Delay before retry (if 429 issued)

🔐 Edition + Feature Control¶

Feature flag: rateLimitingEnabled
Edition enforcement via EditionRateLimitPolicyResolver
Custom plugins can define custom rate calculation rules

📁 Output Artifacts¶

File	Purpose
`rate-limits.json`	Merged policies
`docs/rate-limiting.md`	Human-readable overview
`rate-limit-violations.log`	Policy failures with tenant & trace ID

🧠 Prompt Flags¶

Flag	Description
`--withRateLimit`	Enables all rate limiting logic
`--rateLimitMode=tokenBucket`	Choose strategy
`--rateLimitStorage=redis`	Choose backend
`--rateLimitRetryAfterHeader=true`	Injects `Retry-After`
`--disableRateLimitSoftWarnings=false`	Enables log-only soft violations

🧪 Test Scenarios¶

Test	Expected
Exceed limit → 429
Soft quota → logged warning, no block
Edition-specific limit enforced
Plugin modifies quota dynamically

📈 Observability Metrics¶

Metric	Labels
`gateway_ratelimit_requests_total`	tenant, edition, route
`gateway_ratelimit_throttled_total`	429s
`gateway_ratelimit_retryafter_set_total`	count of Retry-After headers issued

🧾 Summary Manifest, CLI Metadata, and Generator Finalization¶

🎯 Purpose¶

This cycle finalizes the gateway generation process by producing:

A complete manifest summarizing all generated components.
Structured CLI output (human + machine readable).
Reproducible generation metadata for traceability.
Optional signing, registry indexing, and post-generation triggers.

This output is critical for:

CI/CD verification
MCP agent orchestration
Developer documentation
Audit and reproducibility

🧩 Gateway Manifest (JSON Format)¶

File: gateway-manifest.json

{
  "gateway": {
    "name": "ApiGateway.Vetspire.Appointments",
    "version": "1.0.0",
    "environment": "Production",
    "editions": ["Free", "Pro", "Enterprise"],
    "templateVersion": "3.4.1",
    "generatorAgent": "ApiGatewayGeneratorAgent"
  },
  "features": [
    "jwtAuth",
    "apiKeyAuth",
    "rateLimiting",
    "editionPolicies",
    "plugins",
    "observability",
    "healthProbes"
  ],
  "routes": 42,
  "plugins": ["AuditPlugin", "TracingPlugin", "RateLimiter"],
  "auth": {
    "modes": ["JWT", "ApiKey"],
    "authority": "https://auth.vetspire.com"
  },
  "observability": {
    "metrics": "Prometheus",
    "tracing": "Jaeger",
    "logging": "Serilog"
  },
  "security": {
    "cors": true,
    "headers": ["X-Tenant-Id", "X-Request-Id"],
    "httpsRedirect": true
  },
  "generation": {
    "timestamp": "2025-06-14T13:55:00Z",
    "outputPath": "./output/api-gateway/",
    "configProfile": "pro-edition",
    "replayFile": "generator-replay.yaml"
  }
}

📟 CLI Console Output¶

✅ Gateway generated successfully: ApiGateway.Vetspire.Appointments (v1.0.0)
📁 Output Path: ./output/api-gateway/
🧾 Manifest: gateway-manifest.json
🔐 Auth: JWT + API Key | Observability: Prometheus + Jaeger
📦 Plugins: AuditPlugin, RateLimiter | Features: rateLimiting, multi-tenancy
📜 Docs: ./docs/index.md
📄 Replay: generator-replay.yaml

🧠 Machine-Readable CLI Output¶

File: cli-output.json

{
  "success": true,
  "outputPath": "./output/api-gateway/",
  "manifest": "gateway-manifest.json",
  "docs": "./docs/index.md"
}

🧬 Generator Replay Metadata (YAML)¶

File: generator-replay.yaml

template: api-gateway
version: 3.4.1
agent: ApiGatewayGeneratorAgent
edition: Pro
flags:
  withPlugins: true
  withObservability: true
  withRateLimit: true
  withCors: true
outputPath: ./output/api-gateway
timestamp: 2025-06-14T13:55:00Z

This enables:

Re-generation without redefining options.
MCP or CI replay builds.
Audit trail of how the output was produced.

🔐 Optional Signing & Validation¶

When --signManifest=true is passed:

gateway-manifest.sig is created.
SHA256 or RSA signature ensures manifest integrity.
Used for trust validation during deployment.

📁 Generated Summary Files¶

File	Description
`gateway-manifest.json`	Main metadata registry
`cli-output.json`	Machine-readable CLI feedback
`generator-replay.yaml`	Replayable config for regeneration
`docs/index.md`	Human-friendly overview
`metadata.txt`	Concise summary for ZIP/distribution
`manifest.sig` (optional)	Cryptographic signature of manifest file

🧰 Output Packaging (Optional)¶

CLI Flag	Description
`--archiveOutput`	Creates `.zip` of all output
`--uploadToMCP`	Sends manifest and artifacts to MCP registry
`--registerManifest`	Registers with ConnectSoft blueprint index

📡 Post-Generation Webhook¶

If enabled, invokes post-hook to notify orchestrators or DevOps flows:

postGenerate:
  webhook: https://connectsoft.io/hooks/gateway-ready
  payload:
    tenant: vetspire
    gateway: appointments
    version: 1.0.0

📈 Metrics¶

Metric	Description
`gateway_generation_completed_total`	Number of completed generations
`gateway_manifest_output_size_bytes`	Size of manifest output
`gateway_manifest_signature_verified`	Count of valid signed manifests

🔐 Integration with Identity & Authorization Servers¶

🎯 Purpose¶

This cycle defines how the generated API Gateway integrates with identity providers, authorization policies, and multi-tenant security scopes. It supports:

JWT bearer token validation
OpenIddict or external IdP (Auth0, Azure AD, etc.)
Policy-based and claims-based access control
Edition-aware and tenant-aware permission models

🧩 Identity Provider Support¶

Provider Type	Description
OpenIddict	Default for internal, self-hosted identity
Azure AD	Enterprise integration with Microsoft tenants
Auth0 / Okta	SaaS-friendly cloud IdPs
Custom	Validated via OpenID Connect metadata

📜 Example JWT Configuration¶

In gateway-settings.json:

{
  "auth": {
    "jwt": {
      "authority": "https://identity.vetspire.com",
      "audience": "appointments-api",
      "requireHttpsMetadata": true,
      "tokenSources": ["Authorization:Bearer", "cookie:access_token"]
    }
  }
}

Fallback API key is layered under separate mode.

⚙️ Code Integration¶

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.Authority = config["auth:jwt:authority"];
        options.Audience = config["auth:jwt:audience"];
        options.RequireHttpsMetadata = true;
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateLifetime = true,
            NameClaimType = "sub"
        };
    });

🔐 Authorization Strategies¶

Type	Description
Route-based	Routes protected via `[Authorize]`
Policy-based	Custom policies defined per edition, feature
Claims-based	Check for roles, permissions, scopes

🧱 Generated Authorization Policies¶

services.AddAuthorization(options =>
{
    options.AddPolicy("RequireTenantAdmin", policy =>
        policy.RequireClaim("role", "admin")
              .RequireClaim("tenant_id"));

    options.AddPolicy("ProFeatureOnly", policy =>
        policy.RequireClaim("edition", "Pro", "Enterprise"));
});

Mapped to route declarations via:

[Authorize(Policy = "ProFeatureOnly")]
[HttpGet("/v1/export")]

🧠 Edition-Aware Authorization Plugin¶

Supports middleware or plugin override:

public class EditionFeatureAuthorizationMiddleware : IMiddleware
{
    public async Task InvokeAsync(HttpContext context, RequestDelegate next)
    {
        var edition = context.User.FindFirst("edition")?.Value;
        var route = context.Request.Path;

        if (!_featureMatrix.Allows(route, edition))
            return Results.Forbid("Upgrade your edition.");

        await next(context);
    }
}

🔧 Prompt Flags¶

Flag	Description
`--withJwt`	Enables JWT bearer authentication
`--authAuthority=https://auth.mycompany.com`	Sets OpenID Connect issuer
`--requireHttpsMetadata=true`	Forces secure discovery
`--withAuthPolicies`	Adds edition/feature-specific access rules
`--withCustomClaims role,tenant_id,edition`	Define expected claims
`--supportMultipleIssuers`	Enables validation against multiple IdPs

📁 Generated Files¶

File	Description
`auth-settings.json`	Auth-related configuration
`AuthPolicies.cs`	Code-generated policies
`AuthDocumentation.md`	Markdown reference
`gateway-auth.log`	Auth request diagnostics (on failure)

🧪 Test Scenarios¶

Scenario	Outcome
JWT token valid → access granted
Invalid audience → 403
Missing edition claim → 403 (if feature-gated)
Admin-only route → non-admin blocked

📈 Observability Metrics¶

Metric	Labels
`gateway_auth_success_total`	tenant, issuer
`gateway_auth_failure_total`	reason (invalid, expired, no claim)
`gateway_authorization_policy_applied_total`	policy, route

🤖 AI Copilot and MCP-Aware Enhancements¶

🎯 Purpose¶

This cycle introduces AI- and MCP-friendly metadata layers, allowing:

AI agents (like ConnectSoft Copilot) to introspect, reason, and extend the gateway
MCP Servers to orchestrate upgrades, diffs, and validations
Developer copilots to explain, modify, and regenerate gateway components

This enables:

💡 AI-assisted debugging and doc generation
🔄 Autonomous regeneration from traced memory diffs
🔗 MCP-driven software factory orchestration

🧠 MCP Server Annotations¶

Manifest fields enriched with MCP-standard tags:

{
  "manifestVersion": "1.2",
  "mcp": {
    "type": "gateway",
    "componentId": "connectsoft.gateway.vetspire.appointments",
    "semanticTags": ["api", "reverse-proxy", "observability", "jwt"],
    "lifecycle": "generated",
    "relations": {
      "routes": ["connectsoft.service.vetspire.appointments"],
      "auth": ["connectsoft.auth.server"]
    }
  }
}

Can be pushed to MCP Server using:

mcp push gateway-manifest.json

📘 AI Copilot Summary File¶

File: copilot-hints.json

Includes:

Human-readable explanations of key modules
GPT-inlined summaries for each feature
Route-to-feature mappings
Annotated prompt inputs for regeneration

{
  "overview": "API Gateway for Vetspire Appointments...",
  "auth": "JWT-based access, scoped by tenant and edition...",
  "rateLimiting": "Token bucket strategy with per-route quotas...",
  "plugins": [
    { "name": "AuditPlugin", "purpose": "Logs every export for compliance" }
  ]
}

📋 Generated Explainability Output¶

File	Description
`copilot-hints.json`	AI-introspectable explanations
`copilot-readme.md`	Developer-facing quick tour
`mcp-tags.json`	Tags to integrate with Model Context Protocol
`mcp-upload.yaml`	Snapshot trigger script

🧩 Semantic Tags for MCP Integration¶

Injected into:

gateway-manifest.json
route-registry.json
docs/index.md frontmatter

Example:

tags:
  - type: gateway
  - tenant: vetspire
  - auth: jwt
  - observability: jaeger
  - edition-aware: true

🧠 Prompt Flags¶

Flag	Description
`--withCopilotHints`	Generate AI-friendly summaries
`--mcpTags=auth,edition-aware,plugins`	Append MCP tags to manifest
`--registerWithMCP`	Trigger MCP upload and indexing
`--copilotExplain=true`	Write explanations per route/feature

🧪 Test Scenarios¶

Scenario	Validation
MCP receives manifest with valid tags
Copilot explains each route and plugin
Copilot recreates gateway from `replay.yaml` and `copilot-hints.json`
AI suggests valid modifications via CLI or UI

📈 Metrics¶

Metric	Description
`gateway_mcp_upload_success_total`	MCP publish count
`copilot_hint_generation_duration_seconds`	Time to summarize logic
`copilot_field_explained_total`	Fields summarized

🔄 Rebuild / Upgrade / Refactor Automation¶

🎯 Purpose¶

This cycle enables the API Gateway Generator Agent to automatically regenerate or refactor gateway output when:

Edition rules, plugins, routes, or observability configurations change.
Templates are upgraded to a newer version.
CI/CD or MCP workflows require validation and refresh.

Supports:

Smart diffing and change impact detection
Auto-merge or regeneration logic
Agent-triggered incremental gateway upgrades

🧠 Smart Diff Engine¶

The agent computes and stores a baseline snapshot of:

generator-replay.yaml
gateway-manifest.json
All CLI options and feature flags

On re-run, compares current inputs with baseline:

changes:
  - field: routes.added
    value: /v1/export
  - field: auth.authority
    old: https://auth.vetspire.com
    new: https://auth.vetspire.io
  - field: features.removed
    value: "auditTrail"

Triggers:

Partial regeneration
Plugin/module removal
Conflict warnings if manual edits are detected

🔁 Upgrade Workflow¶

dotnet connectsoft gateway upgrade \
  --targetVersion 3.5.0 \
  --diffOnly \
  --autoResolveSafeChanges

Supports:

Diff-only mode (dry run)
Auto-resolve with preserved custom code
Unsafe changes (breaking schema) flagged for human intervention

⚙️ Generated Artifacts¶

File	Purpose
`gateway-diff-report.md`	Human-readable summary of changes
`gateway-changelog.json`	JSON diff between previous and new state
`upgrade-plan.yaml`	Structured upgrade instructions for automated application
`rebuild-script.sh`	Rebuild runner with preserved options

🧩 Template Upgrade Handling¶

Checks:

CLI template version differences
Updated plugin APIs or observability providers
Deprecated routes or manifest formats

When changes are safe:

Auto-upgrades files in-place
Logs all patch points
Adds upgrade field in gateway-manifest.json:

"upgrade": {
  "from": "3.4.1",
  "to": "3.5.0",
  "status": "complete",
  "issues": 0
}

🧠 Prompt Flags¶

Flag	Description
`--rebuild`	Forces regeneration
`--diffOnly`	Runs comparison without file writes
`--resolveConflicts=manual	auto`	Conflict strategy
`--upgradeTo=version`	Upgrade template to newer version
`--skipManualOverrides`	Ignores manually edited sections

🧪 Scenarios¶

Case	Expected Result
Route added → diff marks as added
Plugin removed from template → flagged as breaking
Edition upgraded → changes reflected in manifest and auth policies
Template version bump → diffs reported with optional resolution

📈 Metrics¶

Metric	Description
`gateway_regeneration_total`	Count of regenerations
`gateway_diff_detected_total`	Diffs discovered
`gateway_upgrade_success_total`	Clean upgrade completions

🧪 Developer Sandbox, Examples, and Quickstart Scripts¶

🎯 Purpose¶

This cycle enhances developer experience by generating a complete sandbox environment, including:

A self-contained dev gateway configuration
Example microservice stubs or mocks
Pre-configured HTTP clients and Postman collections
Quickstart scripts for onboarding and local validation

This makes the generated gateway immediately testable, explainable, and extensible by humans and agents.

🧪 Sandbox Setup Structure¶

/sandbox/
├── docker-compose.override.yml
├── mock-services/
│   ├── user-service.json
│   ├── appointment-service.json
├── gateway.dev.settings.json
├── seed-data/
│   ├── tenants.json
│   └── editions.json
├── run-sandbox.ps1 / .sh
├── quickstart.http
└── postman-collection.json

🐳 Docker Sandbox Compose File¶

services:
  gateway:
    build: ../
    ports:
      - "5100:80"
    environment:
      - DOTNET_ENVIRONMENT=Development
    volumes:
      - ./gateway.dev.settings.json:/app/appsettings.Development.json
  mock-appointments:
    image: wiremock/wiremock
    volumes:
      - ./mock-services:/home/wiremock
    ports:
      - "9090:8080"

🚀 Quickstart Scripts¶

run-sandbox.ps1 / run-sandbox.sh:

Builds and starts the gateway and mocks
Seeds example tenants
Prints sample curl/Postman instructions

./run-sandbox.sh
# Output:
# 🚀 Gateway running at http://localhost:5100
# 🧪 Try: curl http://localhost:5100/v1/appointments?apikey=test-key

🧾 Quickstart HTTP File (for REST Clients)¶

File: quickstart.http

### GET Appointments (API Key)
GET http://localhost:5100/v1/appointments
X-Api-Key: test-key

### GET User (JWT)
GET http://localhost:5100/v1/users
Authorization: Bearer {{jwt}}

📬 Postman Collection (Auto-generated)¶

Includes examples for:
Authenticated and anonymous routes
Feature-gated editions
CORS preflight test
Comes with environment file for local vars (localhost, tokens, etc.)

🧱 Seed Data¶

Used to simulate multi-tenant behavior:

// tenants.json
[
  { "id": "tenantA", "edition": "Free", "apikey": "test-key" },
  { "id": "tenantB", "edition": "Pro",  "apikey": "pro-key" }
]

Loaded into in-memory store on startup or injected via plugin.

🧠 Prompt Flags¶

Flag	Description
`--withSandbox`	Generates sandbox folder
`--includeMocks`	Adds WireMock or static mocks
`--generatePostman`	Outputs Postman collection
`--addQuickstartHttp`	Adds `.http` test file
`--seedTenants=test1:test-key,test2:pro-key`	Adds dev tenant mocks

📈 Metrics¶

Metric	Description
`sandbox_requests_total`	Requests during sandbox runs
`sandbox_mock_hit_total`	Wiremock or stub routes hit
`sandbox_script_run_total`	Times quickstart script executed

✅ Outcome¶

Value	Description
🧑‍💻 Developer-Ready	One-liner start for local validation
🤖 Agent-Introspectable	AI copilots can explore sandbox routes
🧪 QA Test Harness	Used in integration and CI pipelines

📌 Conclusion¶

The API Gateway Generator Agent plays a critical role in the ConnectSoft AI Software Factory, acting as the programmable ingress layer for all generated SaaS microservices. Its ability to synthesize a secure, scalable, multi-tenant API Gateway from edition-aware specifications and domain-driven contracts makes it foundational for governed exposure of capabilities across product boundaries.

Through its integration with MCP servers, authentication systems, observability stacks, and AI copilots, the agent ensures that each generated gateway is:

Security-first by default,
Edition-intelligent at runtime,
Telemetry-compliant out of the box,
And evolution-ready through replayable manifests and smart upgrade flows.

Its outputs not only serve as operational entry points but also become semantic assets, traceable and orchestratable across the lifecycle — empowering AI agents, developers, and systems to coordinate seamlessly.

As ConnectSoft continues scaling toward thousands of intelligent microservices and APIs, the API Gateway Generator Agent ensures every route, plugin, and policy remains visible, controlled, and explainable — by both humans and machines.

🌐 API Gateway Generator Agent¶

🎯 Purpose and Architectural Role of the API Gateway in the Factory¶

🧠 Agent Identity¶

🎯 Core Purpose¶

🏗 Architectural Role in the Factory¶

🧭 Responsibilities by Stage¶

🎯 Why It’s Critical¶

🧠 Differentiation from Other Agents¶

📦 Summary¶

📦 Responsibilities – Security, Routing, Observability, Tiering¶

🎯 Overview¶

🛡 Core Responsibility Areas¶

🔐 Security Enforcements¶

🔀 Routing Engine Output¶

📈 Observability Hooks Embedded¶

🔐 Plan & Tier Enforcement¶

📚 Emitted Artifacts by Responsibility Area¶

🧾 Inputs – API Designer Outputs, Gateway Blueprint, Planner Intents¶

🎯 Purpose¶

📤 Primary Input Channels¶

📐 Example: API Designer Output¶

🧱 Gateway Blueprint Structure¶

🧠 Planner-Defined Flags¶

📦 Template Input Mapping¶

📁 Optional External Inputs¶

🧠 Memory Recall Integration¶

📤 Outputs – Gateway Project, Config, Plugins, Docs, Pipelines¶

🎯 Purpose¶

🏗️ Core Generated Output Structure¶

📦 Main Output Categories¶

📋 Example: version.json¶

📄 Documentation Artifacts¶

🧪 Test and QA Outputs¶

🧵 CI/CD Integration¶

🧠 Knowledge Base – Archetypes, Shared Policies, Domain Boundaries¶

🎯 Purpose¶

🧩 Gateway Archetypes (Types)¶

🧰 Built-in Shared Policies¶

🧠 Domain Boundary Knowledge¶

📖 Tenant Isolation Strategy Matrix¶

📚 Semantic Patterns Known¶

📁 Memory-Aware Components¶

🔄 Process Flow – Generation Stages, Validation, Retry Points¶

🎯 Purpose¶

🧭 High-Level Generation Phases¶

⚙️ Detailed Steps¶

🧪 Validation Types¶

🧠 Retry Logic¶

🔁 Retry Decision Tree¶

🛠 Technologies and Stack Integration – .NET 8, Plugins, Middleware, Telemetry¶

🎯 Purpose¶

🧱 Core Technologies¶

🧩 Plugin and Policy Framework¶

🔌 Middleware Layers Injected¶

📦 Generated Solution Patterns¶

📊 Observability Tools¶

🧪 Test Stack (if --withTests enabled)¶

🗂 Project Scaffolding and Folder Layout¶

🎯 Purpose¶

🧱 Root Structure – Example¶

📁 Folder Responsibilities¶

🧩 Code Entry Points¶

🔍 Naming Convention and Package Identity¶

🧠 Dynamic Path Injection¶

🛣 Route Mapping and Path Normalization¶

🎯 Purpose¶

🧩 Route Definition Pipeline¶

🧱 Normalized Route Shape¶

🛠 Generated C# Mapping¶

📏 Path Normalization Logic¶

🔐 Authorization Metadata Injection¶

🧬 Edition Gating¶

🧪 Route-Level Validations¶

📤 Optional Export Formats¶

🔐 Authentication Layer – JWT, API Keys, and Custom Claims¶

🎯 Purpose¶

🔐 Supported Authentication Modes¶

🔧 JWT Validation Middleware¶

🧠 Agent-Known JWT Conventions¶

🔐 API Key Middleware¶

📋 Example: `version.json`¶

🧪 Test Stack (if `--withTests` enabled)¶

🧪 Edition & Auth Tests (in `PolicyTests.cs`)¶

🧪 Tenant Tests (in `TenantTests.cs`)¶