# Send FastAPI to your agent Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually. ## Fast path - Download the package from Yavira. - Extract it into a folder your agent can access. - Paste one of the prompts below and point your agent at the extracted folder. ## Suggested prompts ### New install ```text I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Tell me what you changed and call out any manual steps you could not complete. ``` ### Upgrade existing ```text I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Summarize what changed and any follow-up checks I should run. ``` ## Machine-readable fields ```json { "schemaVersion": "1.0", "item": { "slug": "fastapi", "name": "FastAPI", "source": "tencent", "type": "skill", "category": "开发工具", "sourceUrl": "https://clawhub.ai/ivangdavila/fastapi", "canonicalUrl": "https://clawhub.ai/ivangdavila/fastapi", "targetPlatform": "OpenClaw" }, "install": { "downloadUrl": "/downloads/fastapi", "sourceDownloadUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=fastapi", "sourcePlatform": "tencent", "targetPlatform": "OpenClaw", "packageFormat": "ZIP package", "primaryDoc": "SKILL.md", "includedAssets": [ "SKILL.md" ], "downloadMode": "redirect", "sourceHealth": { "source": "tencent", "slug": "fastapi", "status": "healthy", "reason": "direct_download_ok", "recommendedAction": "download", "checkedAt": "2026-05-03T04:16:07.353Z", "expiresAt": "2026-05-10T04:16:07.353Z", "httpStatus": 200, "finalUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=fastapi", "contentType": "application/zip", "probeMethod": "head", "details": { "probeUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=fastapi", "contentDisposition": "attachment; filename=\"fastapi-1.0.0.zip\"", "redirectLocation": null, "bodySnippet": null, "slug": "fastapi" }, "scope": "item", "summary": "Item download looks usable.", "detail": "Yavira can redirect you to the upstream package for this item.", "primaryActionLabel": "Download for OpenClaw", "primaryActionHref": "/downloads/fastapi" }, "validation": { "installChecklist": [ "Use the Yavira download entry.", "Review SKILL.md after the package is downloaded.", "Confirm the extracted package contains the expected setup assets." ], "postInstallChecks": [ "Confirm the extracted package includes the expected docs or setup files.", "Validate the skill or prompts are available in your target agent workspace.", "Capture any manual follow-up steps the agent could not complete." ] } }, "links": { "detailUrl": "https://openagent3.xyz/skills/fastapi", "downloadUrl": "https://openagent3.xyz/downloads/fastapi", "agentUrl": "https://openagent3.xyz/skills/fastapi/agent", "manifestUrl": "https://openagent3.xyz/skills/fastapi/agent.json", "briefUrl": "https://openagent3.xyz/skills/fastapi/agent.md" } } ``` ## Documentation ### Async Traps Mixing sync database drivers (psycopg2, PyMySQL) in async endpoints blocks the event loop — use async drivers (asyncpg, aiomysql) or run sync code in run_in_executor time.sleep() in async endpoints blocks everything — use await asyncio.sleep() instead CPU-bound work in async endpoints starves other requests — offload to ProcessPoolExecutor or background workers Async endpoints calling sync functions that do I/O still block — the entire call chain must be async ### Pydantic Validation Default values in models become shared mutable state: items: list = [] shares the same list across requests — use Field(default_factory=list) Optional[str] doesn't make a field optional in the request — add = None or use Field(default=None) Pydantic v2 uses model_validate() not parse_obj(), and model_dump() not .dict() — v1 methods are deprecated Use Annotated[str, Field(min_length=1)] for reusable validated types instead of repeating constraints ### Dependency Injection Dependencies run on every request by default — use lru_cache on expensive dependencies or cache in app.state for singletons Depends() without an argument reuses the type hint as the dependency — clean but can confuse readers Nested dependencies form a DAG — if A depends on B and C, and both B and C depend on D, D runs once (cached per-request) yield dependencies for cleanup (DB sessions, file handles) — code after yield runs even if the endpoint raises ### Lifespan and Startup @app.on_event("startup") is deprecated — use lifespan async context manager Store shared resources (DB pool, HTTP client) in app.state during lifespan, not as global variables Lifespan runs once per worker process — with 4 Uvicorn workers you get 4 DB pools from contextlib import asynccontextmanager @asynccontextmanager async def lifespan(app): app.state.db = await create_pool() yield await app.state.db.close() app = FastAPI(lifespan=lifespan) ### Request/Response Return dict from endpoints, not Pydantic models directly — FastAPI handles serialization and it's faster Use status_code=201 on POST endpoints returning created resources — 200 is the default but semantically wrong Response with media_type="text/plain" for non-JSON responses — returning a string still gets JSON-encoded otherwise Set response_model_exclude_unset=True to omit None fields from response — cleaner API output ### Error Handling raise HTTPException(status_code=404) — don't return Response objects for errors, it bypasses middleware Custom exception handlers with @app.exception_handler(CustomError) — but remember they don't catch HTTPException Use detail= for user-facing messages, log the actual error separately — don't leak stack traces ### Background Tasks BackgroundTasks runs after the response is sent but still in the same process — not suitable for long-running jobs Tasks execute sequentially in order added — don't assume parallelism If a background task fails, the client never knows — add your own error handling and alerting ### Security OAuth2PasswordBearer is for documentation only — it doesn't validate tokens, you must implement that in the dependency CORS middleware must come after exception handlers in middleware order — or errors won't have CORS headers Depends(get_current_user) in path operation, not in router — dependencies on routers affect all routes including health checks ### Testing TestClient runs sync even for async endpoints — use httpx.AsyncClient with ASGITransport for true async testing Override dependencies with app.dependency_overrides[get_db] = mock_db — cleaner than monkeypatching TestClient context manager ensures lifespan runs — without with TestClient(app) as client: startup/shutdown hooks don't fire ## Trust - Source: tencent - Verification: Indexed source record - Publisher: ivangdavila - Version: 1.0.0 ## Source health - Status: healthy - Item download looks usable. - Yavira can redirect you to the upstream package for this item. - Health scope: item - Reason: direct_download_ok - Checked at: 2026-05-03T04:16:07.353Z - Expires at: 2026-05-10T04:16:07.353Z - Recommended action: Download for OpenClaw ## Links - [Detail page](https://openagent3.xyz/skills/fastapi) - [Send to Agent page](https://openagent3.xyz/skills/fastapi/agent) - [JSON manifest](https://openagent3.xyz/skills/fastapi/agent.json) - [Markdown brief](https://openagent3.xyz/skills/fastapi/agent.md) - [Download page](https://openagent3.xyz/downloads/fastapi)