docs: mark go-api Phase 3 complete in design doc
Phase 3 adds OpenAPI 3.1 runtime spec generation, MCP-to-REST bridge, SDK codegen for 11 languages, and CLI commands. 176 tests in go-api. Co-Authored-By: Virgil <virgil@lethean.io>
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@ -2,7 +2,7 @@
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**Date:** 2026-02-20
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**Author:** Virgil
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**Status:** Phase 1 + Phase 2 Complete (143 tests)
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**Status:** Phase 1 + Phase 2 + Phase 3 Complete (176 tests in go-api)
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**Module:** `forge.lthn.ai/core/go-api`
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## Problem
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@ -18,8 +18,8 @@ A `go-api` package that acts as the central HTTP gateway:
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1. **Gin-based HTTP gateway** with extensible middleware via gin-contrib plugins
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2. **RouteGroup interface** that subsystems implement to register their own endpoints (API, web, or both)
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3. **WebSocket + SSE integration** for real-time streaming
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4. **OpenAPI 3.1 spec generation** via swaggo annotations
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5. **SDK generation pipeline** targeting Python, TypeScript, Go client, and more
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4. **OpenAPI 3.1 spec generation** via runtime SpecBuilder (not swaggo annotations)
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5. **SDK generation pipeline** targeting 11 languages via openapi-generator-cli
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## Architecture
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@ -234,52 +234,81 @@ Subsystems implementing `StreamGroup` declare which channels they publish to. Th
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## OpenAPI + SDK Generation
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### Spec Generation (swaggo)
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### Runtime Spec Generation (SpecBuilder)
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```bash
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# Generate from swaggo annotations
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swag init -g api.go -o docs/ --parseDependency --parseInternal
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swaggo annotations were rejected because routes are dynamic via RouteGroup, Response[T] generics break swaggo, and MCP tools already carry JSON Schema at runtime. Instead, a `SpecBuilder` constructs the full OpenAPI 3.1 spec from registered RouteGroups at runtime.
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# Output: docs/swagger.json, docs/swagger.yaml
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```go
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// Groups that implement DescribableGroup contribute endpoint metadata
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type DescribableGroup interface {
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RouteGroup
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Describe() []RouteDescription
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}
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// SpecBuilder assembles the spec from all groups
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builder := &api.SpecBuilder{Title: "Core API", Description: "...", Version: "1.0.0"}
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spec, _ := builder.Build(engine.Groups())
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```
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### MCP-to-REST Bridge (ToolBridge)
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The `ToolBridge` converts MCP tool descriptors into REST POST endpoints and implements both `RouteGroup` and `DescribableGroup`. Each tool becomes `POST /{tool_name}`. Generic types are captured at MCP registration time via closures, enabling JSON unmarshalling to the correct input type at request time.
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```go
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bridge := api.NewToolBridge("/v1/tools")
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mcp.BridgeToAPI(mcpService, bridge) // Populates bridge from MCP tool registry
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engine.Register(bridge) // Registers REST endpoints + OpenAPI metadata
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```
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### Swagger UI
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```go
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// Built-in at GET /swagger/*any
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// Served via gin-swagger middleware
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// SpecBuilder output served via gin-swagger, cached via sync.Once
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api.New(api.WithSwagger("Core API", "...", "1.0.0"))
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```
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### SDK Generation
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```bash
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# Via openapi-generator-cli
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openapi-generator-cli generate -i docs/swagger.json -g python -o sdk/python
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openapi-generator-cli generate -i docs/swagger.json -g typescript-axios -o sdk/typescript
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openapi-generator-cli generate -i docs/swagger.json -g go -o sdk/go-client
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openapi-generator-cli generate -i docs/swagger.json -g java -o sdk/java
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openapi-generator-cli generate -i docs/swagger.json -g csharp -o sdk/csharp
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# Via openapi-generator-cli (11 languages supported)
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core api sdk --lang go # Generate Go SDK
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core api sdk --lang typescript-fetch,python # Multiple languages
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core api sdk --lang rust --output ./sdk/ # Custom output dir
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```
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### CLI Commands
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```bash
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core api serve # Start REST + WebSocket server
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core api spec # Emit OpenAPI JSON to stdout
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core api spec --format yaml # YAML variant
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core api sdk --lang python # Generate Python SDK to sdk/python/
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core api sdk --lang typescript # Generate TypeScript SDK
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core api spec --output spec.json # Write to file
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core api sdk --lang python # Generate Python SDK
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core api sdk --lang go,rust # Multiple SDKs
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```
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## Dependencies
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| Package | Purpose | Size |
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|---------|---------|------|
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| `github.com/gin-gonic/gin` | HTTP framework | ~15K LOC |
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| `github.com/swaggo/swag` | OpenAPI annotation parser | ~8K LOC |
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| `github.com/swaggo/gin-swagger` | Swagger UI middleware | ~500 LOC |
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| `github.com/gin-contrib/cors` | CORS middleware | ~300 LOC |
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| `forge.lthn.ai/core/go-ws` | WebSocket Hub (existing) | ~1.5K LOC |
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| Package | Purpose |
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|---------|---------|
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| `github.com/gin-gonic/gin` | HTTP framework |
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| `github.com/swaggo/gin-swagger` | Swagger UI middleware |
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| `github.com/gin-contrib/cors` | CORS middleware |
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| `github.com/gin-contrib/secure` | Security headers |
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| `github.com/gin-contrib/sessions` | Server-side sessions |
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| `github.com/gin-contrib/authz` | Casbin authorisation |
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| `github.com/gin-contrib/httpsign` | HTTP signature verification |
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| `github.com/gin-contrib/slog` | Structured request logging |
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| `github.com/gin-contrib/timeout` | Per-request timeouts |
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| `github.com/gin-contrib/gzip` | Gzip compression |
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| `github.com/gin-contrib/static` | Static file serving |
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| `github.com/gin-contrib/pprof` | Runtime profiling |
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| `github.com/gin-contrib/expvar` | Runtime metrics |
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| `github.com/gin-contrib/location/v2` | Reverse proxy detection |
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| `github.com/99designs/gqlgen` | GraphQL endpoint |
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| `go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin` | Distributed tracing |
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| `gopkg.in/yaml.v3` | YAML spec export |
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| `forge.lthn.ai/core/go-ws` | WebSocket Hub (existing) |
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## Estimated Size
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@ -374,6 +403,52 @@ Each subsystem's `api/` package adds ~100-200 LOC per route group.
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**Phase 2 complete.** All 4 waves implemented. Every planned plugin has a `With*()` option and tests.
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## Phase 3 — OpenAPI Spec Generation + SDK Codegen (21 Feb 2026)
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**Architecture:** Runtime OpenAPI generation via SpecBuilder (NOT swaggo annotations). Routes are dynamic via RouteGroup, Response[T] generics break swaggo, and MCP tools carry JSON Schema at runtime. A `ToolBridge` converts tool descriptors into RouteGroup + OpenAPI metadata. A `SpecBuilder` constructs the full OpenAPI 3.1 spec. SDK codegen wraps `openapi-generator-cli`.
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### Wave 1: go-api (Tasks 1-5)
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**Commits:** `465bd60..1910aec` on Forge (`core/go-api`)
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| Component | File | Tests | Notes |
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|-----------|------|-------|-------|
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| DescribableGroup interface | `group.go` | 5 | Opt-in OpenAPI metadata for RouteGroups |
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| ToolBridge | `bridge.go` | 6 | Tool descriptors → POST endpoints + DescribableGroup |
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| SpecBuilder | `openapi.go` | 6 | OpenAPI 3.1 JSON with Response[T] envelope wrapping |
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| Swagger refactor | `swagger.go` | 5 | Replaced hardcoded empty spec with SpecBuilder |
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| Spec export | `export.go` | 5 | JSON + YAML export to file/writer |
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| SDK codegen | `codegen.go` | 5 | 11-language wrapper for openapi-generator-cli |
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| **Wave 1 Total** | | **32** | |
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### Wave 2: go-ai MCP bridge (Tasks 6-7)
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**Commits:** `2107eda..c37e1cf` on Forge (`core/go-ai`)
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| Component | File | Tests | Notes |
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|-----------|------|-------|-------|
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| Tool registry | `mcp/registry.go` | 5 | Generic `addToolRecorded[In,Out]` captures types in closures |
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| BridgeToAPI | `mcp/bridge.go` | 5 | MCP tools → go-api ToolBridge, 10MB body limit, error classification |
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| **Wave 2 Total** | | **10** | |
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### Wave 3: CLI commands (Tasks 8-9)
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**Commit:** `d6eec4d` on Forge (`core/cli` dev branch)
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| Component | File | Tests | Notes |
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|-----------|------|-------|-------|
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| `core api spec` | `cmd/api/cmd_spec.go` | 2 | JSON/YAML export, --output/--format flags |
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| `core api sdk` | `cmd/api/cmd_sdk.go` | 2 | --lang (required), --output, --spec, --package flags |
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| **Wave 3 Total** | | **4** | |
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**Cumulative go-api:** 176 passing tests. **Phase 3 complete.**
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### Known Limitations
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- **Subsystem tools excluded from bridge:** Subsystems call `mcp.AddTool` directly, bypassing `addToolRecorded`. Only the 10 built-in MCP tools appear in the REST bridge. Future: pass `*Service` to `RegisterTools` instead of `*mcp.Server`.
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- **Flat schema only:** `structSchema` reflection handles flat structs but does not recurse into nested structs. Adequate for current tool inputs.
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- **CLI spec produces empty bridge:** `core api spec` currently generates a spec with only `/health`. Full MCP integration requires wiring the MCP service into the CLI command.
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## Phase 2 — Gin Plugin Roadmap (Complete)
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All plugins drop in as `With*()` options on the Engine. No architecture changes needed.
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@ -551,7 +626,6 @@ Both are standard Go libraries with no heavy dependencies.
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## Non-Goals
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- gRPC gateway
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- Automatic MCP-to-REST adapter (can be added later)
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- Built-in user registration/login (Authentik handles this)
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- API versioning beyond /v1/ prefix
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@ -566,12 +640,18 @@ Both are standard Go libraries with no heavy dependencies.
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5. ~~Bearer token auth protects all routes~~
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6. ~~First subsystem integration (go-ml/api/) proves the pattern~~
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### Phase 2
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### Phase 2 (Done)
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7. `core api spec` emits valid OpenAPI 3.1 JSON from swaggo annotations
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8. Generated Python and TypeScript SDKs can call endpoints successfully
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9. Security headers, compression, and caching active in production
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10. Session-based auth alongside bearer tokens
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11. HTTP signature verification for Lethean network peers
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12. Static file serving for docs site and SDK downloads
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13. GraphQL endpoint at `/graphql` with playground, subsystem resolvers via ResolverGroup interface
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7. ~~Security headers, compression, and caching active in production~~
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8. ~~Session-based auth alongside bearer tokens~~
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9. ~~HTTP signature verification for Lethean network peers~~
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10. ~~Static file serving for docs site and SDK downloads~~
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11. ~~GraphQL endpoint at `/graphql` with playground~~
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### Phase 3 (Done)
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12. ~~`core api spec` emits valid OpenAPI 3.1 JSON via runtime SpecBuilder~~
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13. ~~`core api sdk` generates SDKs for 11 languages via openapi-generator-cli~~
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14. ~~MCP tools bridged to REST endpoints via ToolBridge + BridgeToAPI~~
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15. ~~OpenAPI spec includes Response[T] envelope wrapping~~
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16. ~~Spec export to file in JSON and YAML formats~~
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