# OpenRouter Integration: End-to-End Validation Report

**Task:** validate-openrouter-end
**Date:** 2026-03-08
**Branch:** safety-mandatory-validation
**Commit under test:** 13ef7a9 (synthesis-openrouter-integration)

---

## 1. Config Validation

| Test | Result | Notes |
|------|--------|-------|
| `wg config --set-provider default openrouter` | PASS | Parses and saves correctly |
| `wg config --set-model default minimax/minimax-m2.5` | PASS | Persists to `.wg/config.toml` |
| Config read-back via `wg config --show` | PASS | Shows `default.provider = "openrouter"` and `default.model = "minimax/minimax-m2.5"` |
| Provider routing: "openrouter" maps to `OpenAiClient` | PASS | `provider.rs:102` — match arm includes `"openrouter"` |
| Provider routing: "local" maps to `OpenAiClient` | PASS | Same match arm covers `"local"` |
| API key resolution: `OPENROUTER_API_KEY` checked first | PASS | `openai_client.rs:703` — priority order confirmed |
| API key resolution: fallback to `OPENAI_API_KEY` | PASS | Second in priority chain |
| API key resolution: fallback to config file | PASS | Reads `[native_executor] api_key` from config |
| Missing key error message | PASS | Clear message: "Set OPENROUTER_API_KEY or OPENAI_API_KEY..." |

---

## 2. Build Validation

| Test | Result | Notes |
|------|--------|-------|
| `cargo fmt --check` | PASS | No formatting issues |
| `cargo clippy -- -D warnings` | PASS | Zero warnings |
| `cargo test` (full suite) | PASS | 3,900+ tests, 0 failures, 11 ignored |

---

## 3. API Validation

**Status:** SKIPPED — No `OPENROUTER_API_KEY` environment variable set, no `.openrouter.key` file found.

The `.openrouter.key` file referenced in task logs was not present at validation time. Live API tests could not be run.

| Test | Result | Notes |
|------|--------|-------|
| Real API call to minimax/minimax-m2.5 | SKIPPED | No API key |
| Streaming verification | SKIPPED | No API key |
| Tool use verification | SKIPPED | No API key |
| Token usage reporting | SKIPPED | No API key |

---

## 4. Fallback Validation (No API Key)

| Test | Result | Notes |
|------|--------|-------|
| Helpful error when key missing | PASS | `resolve_openai_api_key()` returns actionable error message listing env vars and config option |
| Config commands work without key | PASS | `--set-provider` and `--set-model` succeed without any API key set |
| Unit tests (mock API) | PASS | All 33 `openai_client` tests pass — cover serialization, headers, URL construction, streaming, tool calls |

### OpenRouter-Specific Unit Tests (5/5 pass)

| Test | Result | What it validates |
|------|--------|-------------------|
| `test_openrouter_url_construction` | PASS | Base URL resolves correctly, no double `/v1` |
| `test_openrouter_headers_included` | PASS | `HTTP-Referer` and `X-Title` headers present for OpenRouter |
| `test_non_openrouter_no_extra_headers` | PASS | Non-OpenRouter providers don't get attribution headers |
| `test_openrouter_enables_streaming` | PASS | OpenRouter provider hint enables streaming by default |
| `test_stream_chunk_openrouter_gen_prefix` | PASS | Handles OpenRouter's `gen-` ID prefix in streaming chunks |

### Additional OpenAI Client Tests (28/28 pass)

Covering: SSE parsing (6 tests), stream chunk deserialization (6 tests), stream assembly (4 tests), message translation (4 tests), response translation (3 tests), tool translation (1 test), tool call accumulation (1 test), provider hint naming (1 test), streaming configuration (2 tests).

---

## 5. Documentation

| Artifact | Status | Path |
|----------|--------|------|
| Research report | EXISTS | `docs/reports/openrouter-research.md` |
| Design document | EXISTS | `docs/reports/openrouter-design.md` |
| Integration guide | EXISTS | `docs/research/openrouter-integration.md` |
| Config options documented | PASS | Design doc covers env vars, config file, CLI commands |
| Provider hint architecture | PASS | Design doc section 1 explains `provider_hint` field |
| Wire format differences | PASS | Design doc section 4 catalogs all format differences |
| User workflow | PASS | Design doc section 2 shows 3-step setup |

---

## 6. Regression

| Test | Result | Notes |
|------|--------|-------|
| Full `cargo test` suite | PASS | 3,900+ tests, 0 failures |
| Anthropic client unaffected | PASS | No changes to `AnthropicClient` |
| Agent loop unaffected | PASS | Uses `Provider` trait, provider-agnostic |
| Existing config paths | PASS | All pre-existing config options unchanged |

---

## Summary

| Category | Pass | Fail | Skip | Total |
|----------|------|------|------|-------|
| Config validation | 9 | 0 | 0 | 9 |
| Build validation | 3 | 0 | 0 | 3 |
| API validation (live) | 0 | 0 | 4 | 4 |
| Fallback validation | 3 | 0 | 0 | 3 |
| Unit tests (OpenRouter) | 5 | 0 | 0 | 5 |
| Unit tests (OpenAI client) | 28 | 0 | 0 | 28 |
| Documentation | 7 | 0 | 0 | 7 |
| Regression | 4 | 0 | 0 | 4 |
| **Total** | **59** | **0** | **4** | **63** |

**Overall verdict: PASS** (all non-skipped tests pass; skips are due to missing API key, not code issues)

### Implementation Quality Notes

- **Architecture**: Clean `provider_hint` pattern — no subclassing, no trait changes, minimal code (~36 lines changed)
- **Streaming**: Full SSE streaming with tool call accumulation implemented and tested
- **Error handling**: Retryable status codes (429, 500, 502, 503), clear error messages for missing keys
- **Attribution**: OpenRouter headers (`HTTP-Referer`, `X-Title`) correctly included only for OpenRouter
- **URL fix**: Resolved double `/v1` bug in URL construction
- **Test coverage**: 33 unit tests cover all client functionality without API calls
