diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
index 68ee985d..3fbabfea 100644
--- a/.claude-plugin/marketplace.json
+++ b/.claude-plugin/marketplace.json
@@ -11,7 +11,7 @@
     {
       "name": "ecc",
       "source": "./",
-      "description": "The most comprehensive Claude Code plugin — 50 agents, 188 skills, 68 legacy command shims, selective install profiles, and production-ready hooks for TDD, security scanning, code review, and continuous learning",
+      "description": "The most comprehensive Claude Code plugin — 51 agents, 189 skills, 69 legacy command shims, selective install profiles, and production-ready hooks for TDD, security scanning, code review, and continuous learning",
       "version": "2.0.0-rc.1",
       "author": {
         "name": "Affaan Mustafa",
diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index b5c9a8c0..e1ee3c3f 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -1,7 +1,7 @@
 {
   "name": "ecc",
   "version": "2.0.0-rc.1",
-  "description": "Battle-tested Claude Code plugin for engineering teams — 50 agents, 188 skills, 68 legacy command shims, production-ready hooks, and selective install workflows evolved through continuous real-world use",
+  "description": "Battle-tested Claude Code plugin for engineering teams — 51 agents, 189 skills, 69 legacy command shims, production-ready hooks, and selective install workflows evolved through continuous real-world use",
   "author": {
     "name": "Affaan Mustafa",
     "url": "https://x.com/affaanmustafa"
diff --git a/AGENTS.md b/AGENTS.md
index e3166b4f..6c66ad5d 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -1,6 +1,6 @@
 # Everything Claude Code (ECC) — Agent Instructions
 
-This is a **production-ready AI coding plugin** providing 50 specialized agents, 188 skills, 68 commands, and automated hook workflows for software development.
+This is a **production-ready AI coding plugin** providing 51 specialized agents, 189 skills, 69 commands, and automated hook workflows for software development.
 
 **Version:** 2.0.0-rc.1
 
@@ -145,9 +145,9 @@ Troubleshoot failures: check test isolation → verify mocks → fix implementat
 ## Project Structure
 
 ```
-agents/          — 50 specialized subagents
-skills/          — 188 workflow skills and domain knowledge
-commands/        — 68 slash commands
+agents/          — 51 specialized subagents
+skills/          — 189 workflow skills and domain knowledge
+commands/        — 69 slash commands
 hooks/           — Trigger-based automations
 rules/           — Always-follow guidelines (common + per-language)
 scripts/         — Cross-platform Node.js utilities
diff --git a/README.md b/README.md
index 180a60f5..fb7329a3 100644
--- a/README.md
+++ b/README.md
@@ -350,7 +350,7 @@ If you stacked methods, clean up in this order:
 /plugin list ecc@ecc
 ```
 
-**That's it!** You now have access to 50 agents, 188 skills, and 68 legacy command shims.
+**That's it!** You now have access to 51 agents, 189 skills, and 69 legacy command shims.
 
 ### Dashboard GUI
 
@@ -448,7 +448,7 @@ everything-claude-code/
 |   |-- plugin.json         # Plugin metadata and component paths
 |   |-- marketplace.json    # Marketplace catalog for /plugin marketplace add
 |
-|-- agents/           # 50 specialized subagents for delegation
+|-- agents/           # 51 specialized subagents for delegation
 |   |-- planner.md           # Feature implementation planning
 |   |-- architect.md         # System design decisions
 |   |-- tdd-guide.md         # Test-driven development
@@ -1336,9 +1336,9 @@ The configuration is automatically detected from `.opencode/opencode.json`.
 
 | Feature | Claude Code | OpenCode | Status |
 |---------|-------------|----------|--------|
-| Agents | PASS: 50 agents | PASS: 12 agents | **Claude Code leads** |
-| Commands | PASS: 68 commands | PASS: 31 commands | **Claude Code leads** |
-| Skills | PASS: 188 skills | PASS: 37 skills | **Claude Code leads** |
+| Agents | PASS: 51 agents | PASS: 12 agents | **Claude Code leads** |
+| Commands | PASS: 69 commands | PASS: 31 commands | **Claude Code leads** |
+| Skills | PASS: 189 skills | PASS: 37 skills | **Claude Code leads** |
 | Hooks | PASS: 8 event types | PASS: 11 events | **OpenCode has more!** |
 | Rules | PASS: 29 rules | PASS: 13 instructions | **Claude Code leads** |
 | MCP Servers | PASS: 14 servers | PASS: Full | **Full parity** |
@@ -1441,9 +1441,9 @@ ECC is the **first plugin to maximize every major AI coding tool**. Here's how e
 
 | Feature | Claude Code | Cursor IDE | Codex CLI | OpenCode |
 |---------|------------|------------|-----------|----------|
-| **Agents** | 50 | Shared (AGENTS.md) | Shared (AGENTS.md) | 12 |
-| **Commands** | 68 | Shared | Instruction-based | 31 |
-| **Skills** | 188 | Shared | 10 (native format) | 37 |
+| **Agents** | 51 | Shared (AGENTS.md) | Shared (AGENTS.md) | 12 |
+| **Commands** | 69 | Shared | Instruction-based | 31 |
+| **Skills** | 189 | Shared | 10 (native format) | 37 |
 | **Hook Events** | 8 types | 15 types | None yet | 11 types |
 | **Hook Scripts** | 20+ scripts | 16 scripts (DRY adapter) | N/A | Plugin hooks |
 | **Rules** | 34 (common + lang) | 34 (YAML frontmatter) | Instruction-based | 13 instructions |
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 98e52c60..0a52684b 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -160,7 +160,7 @@ Copy-Item -Recurse rules/typescript "$HOME/.claude/rules/"
 /plugin list ecc@ecc
 ```
 
-**完成！** 你现在可以使用 50 个代理、188 个技能和 68 个命令。
+**完成！** 你现在可以使用 51 个代理、189 个技能和 69 个命令。
 
 ### multi-* 命令需要额外配置
 
diff --git a/agent.yaml b/agent.yaml
index b881da12..954fa5fc 100644
--- a/agent.yaml
+++ b/agent.yaml
@@ -152,6 +152,7 @@ commands:
   - cpp-review
   - cpp-test
   - evolve
+  - fastapi-review
   - feature-dev
   - flutter-build
   - flutter-review
diff --git a/agents/fastapi-reviewer.md b/agents/fastapi-reviewer.md
new file mode 100644
index 00000000..735ff05a
--- /dev/null
+++ b/agents/fastapi-reviewer.md
@@ -0,0 +1,70 @@
+---
+name: fastapi-reviewer
+description: Reviews FastAPI applications for async correctness, dependency injection, Pydantic schemas, security, OpenAPI quality, testing, and production readiness.
+tools: ["Read", "Grep", "Glob", "Bash"]
+model: sonnet
+---
+
+You are a senior FastAPI reviewer focused on production Python APIs.
+
+## Review Scope
+
+- FastAPI app construction, routing, middleware, and exception handling.
+- Pydantic request, update, and response models.
+- Async database and HTTP patterns.
+- Dependency injection for database sessions, auth, pagination, and settings.
+- Authentication, authorization, CORS, rate limits, logging, and secret handling.
+- Test dependency overrides and client setup.
+- OpenAPI metadata and generated docs.
+
+## Out of Scope
+
+- Non-FastAPI frameworks unless they directly interact with the FastAPI app.
+- Broad Python style review already covered by `python-reviewer`.
+- Dependency additions without a concrete problem and maintenance rationale.
+
+## Review Workflow
+
+1. Locate the app entry point, usually `main.py`, `app.py`, or `app/main.py`.
+2. Identify routers, schemas, dependencies, database session setup, and tests.
+3. Run available local checks when safe, such as `pytest`, `ruff`, `mypy`, or `uv run pytest`.
+4. Review the changed files first, then inspect adjacent definitions needed to prove findings.
+5. Report only actionable issues with file and line references when available.
+
+## Finding Priorities
+
+### Critical
+
+- Hardcoded secrets or tokens.
+- SQL built through string interpolation.
+- Passwords, token hashes, or internal auth fields exposed in response models.
+- Auth dependencies that can be bypassed or do not validate expiry/signature.
+
+### High
+
+- Blocking database or HTTP clients inside async routes.
+- Database sessions created inline in handlers instead of dependencies.
+- Test overrides targeting the wrong dependency.
+- `allow_origins=["*"]` combined with credentialed CORS.
+- Missing request validation for write endpoints.
+
+### Medium
+
+- Missing pagination on list endpoints.
+- OpenAPI docs missing response models or error response descriptions.
+- Duplicated route logic that should move into a service/dependency.
+- Missing timeout settings for external HTTP clients.
+
+## Output Format
+
+```text
+[SEVERITY] Short issue title
+File: path/to/file.py:42
+Issue: What is wrong and why it matters.
+Fix: Concrete change to make.
+```
+
+End with:
+
+- `Tests checked:` commands run or why they were skipped.
+- `Residual risk:` anything important that could not be verified.
diff --git a/commands/fastapi-review.md b/commands/fastapi-review.md
new file mode 100644
index 00000000..9d730c6e
--- /dev/null
+++ b/commands/fastapi-review.md
@@ -0,0 +1,39 @@
+---
+description: Review a FastAPI application for architecture, async correctness, dependency injection, Pydantic schemas, security, performance, and testability.
+---
+
+# FastAPI Review
+
+Invoke the `fastapi-reviewer` agent for a focused FastAPI review.
+
+## Usage
+
+```text
+/fastapi-review [file-or-directory]
+```
+
+## Review Areas
+
+- App factory, router boundaries, middleware, and exception handlers.
+- Pydantic request and response schema separation.
+- Dependency injection for database sessions, auth, pagination, and settings.
+- Async database and external HTTP patterns.
+- CORS, auth, rate limits, logging, and secret handling.
+- OpenAPI metadata and documented response models.
+- Test client setup and dependency overrides.
+
+## Expected Output
+
+```text
+[SEVERITY] Short issue title
+File: path/to/file.py:42
+Issue: What is wrong and why it matters.
+Fix: Concrete change to make.
+```
+
+## Related
+
+- Agent: `fastapi-reviewer`
+- Skill: `fastapi-patterns`
+- Command: `/python-review`
+- Skill: `security-scan`
diff --git a/docs/zh-CN/AGENTS.md b/docs/zh-CN/AGENTS.md
index f48b0dda..e0fd304a 100644
--- a/docs/zh-CN/AGENTS.md
+++ b/docs/zh-CN/AGENTS.md
@@ -1,6 +1,6 @@
 # Everything Claude Code (ECC) — 智能体指令
 
-这是一个**生产就绪的 AI 编码插件**，提供 50 个专业代理、188 项技能、68 条命令以及自动化钩子工作流，用于软件开发。
+这是一个**生产就绪的 AI 编码插件**，提供 51 个专业代理、189 项技能、69 条命令以及自动化钩子工作流，用于软件开发。
 
 **版本:** 2.0.0-rc.1
 
@@ -146,9 +146,9 @@
 ## 项目结构
 
 ```
-agents/          — 50 个专业子代理
-skills/          — 188 个工作流技能和领域知识
-commands/        — 68 个斜杠命令
+agents/          — 51 个专业子代理
+skills/          — 189 个工作流技能和领域知识
+commands/        — 69 个斜杠命令
 hooks/           — 基于触发的自动化
 rules/           — 始终遵循的指导方针（通用 + 每种语言）
 scripts/         — 跨平台 Node.js 实用工具
diff --git a/docs/zh-CN/README.md b/docs/zh-CN/README.md
index 5f189265..da6f4574 100644
--- a/docs/zh-CN/README.md
+++ b/docs/zh-CN/README.md
@@ -224,7 +224,7 @@ Copy-Item -Recurse rules/typescript "$HOME/.claude/rules/"
 /plugin list ecc@ecc
 ```
 
-**搞定！** 你现在可以使用 50 个智能体、188 项技能和 68 个命令了。
+**搞定！** 你现在可以使用 51 个智能体、189 项技能和 69 个命令了。
 
 ***
 
@@ -1132,9 +1132,9 @@ opencode
 
 | 功能特性 | Claude Code | OpenCode | 状态 |
 |---------|-------------|----------|--------|
-| 智能体 | PASS: 50 个 | PASS: 12 个 | **Claude Code 领先** |
-| 命令 | PASS: 68 个 | PASS: 31 个 | **Claude Code 领先** |
-| 技能 | PASS: 188 项 | PASS: 37 项 | **Claude Code 领先** |
+| 智能体 | PASS: 51 个 | PASS: 12 个 | **Claude Code 领先** |
+| 命令 | PASS: 69 个 | PASS: 31 个 | **Claude Code 领先** |
+| 技能 | PASS: 189 项 | PASS: 37 项 | **Claude Code 领先** |
 | 钩子 | PASS: 8 种事件类型 | PASS: 11 种事件 | **OpenCode 更多！** |
 | 规则 | PASS: 29 条 | PASS: 13 条指令 | **Claude Code 领先** |
 | MCP 服务器 | PASS: 14 个 | PASS: 完整 | **完全对等** |
@@ -1240,9 +1240,9 @@ ECC 是**第一个最大化利用每个主要 AI 编码工具的插件**。以
 
 | 功能特性 | Claude Code | Cursor IDE | Codex CLI | OpenCode |
 |---------|------------|------------|-----------|----------|
-| **智能体** | 50 | 共享 (AGENTS.md) | 共享 (AGENTS.md) | 12 |
-| **命令** | 68 | 共享 | 基于指令 | 31 |
-| **技能** | 188 | 共享 | 10 (原生格式) | 37 |
+| **智能体** | 51 | 共享 (AGENTS.md) | 共享 (AGENTS.md) | 12 |
+| **命令** | 69 | 共享 | 基于指令 | 31 |
+| **技能** | 189 | 共享 | 10 (原生格式) | 37 |
 | **钩子事件** | 8 种类型 | 15 种类型 | 暂无 | 11 种类型 |
 | **钩子脚本** | 20+ 个脚本 | 16 个脚本 (DRY 适配器) | N/A | 插件钩子 |
 | **规则** | 34 (通用 + 语言) | 34 (YAML 前页) | 基于指令 | 13 条指令 |
diff --git a/manifests/install-modules.json b/manifests/install-modules.json
index 5941ba2b..bf43984d 100644
--- a/manifests/install-modules.json
+++ b/manifests/install-modules.json
@@ -125,6 +125,7 @@
         "skills/django-tdd",
         "skills/django-verification",
         "skills/dotnet-patterns",
+        "skills/fastapi-patterns",
         "skills/frontend-patterns",
         "skills/frontend-slides",
         "skills/golang-patterns",
diff --git a/package.json b/package.json
index ca6a7292..8746d7db 100644
--- a/package.json
+++ b/package.json
@@ -146,6 +146,7 @@
     "skills/evm-token-decimals/",
     "skills/exa-search/",
     "skills/fal-ai-media/",
+    "skills/fastapi-patterns/",
     "skills/finance-billing-ops/",
     "skills/foundation-models-on-device/",
     "skills/frontend-patterns/",
diff --git a/rules/python/fastapi.md b/rules/python/fastapi.md
new file mode 100644
index 00000000..6417b3a8
--- /dev/null
+++ b/rules/python/fastapi.md
@@ -0,0 +1,58 @@
+---
+paths:
+  - "**/app/**/*.py"
+  - "**/fastapi/**/*.py"
+  - "**/*_api.py"
+---
+# FastAPI Rules
+
+Use these rules for FastAPI projects alongside the general Python rules.
+
+## Structure
+
+- Put app construction in `create_app()`.
+- Keep routers thin; move persistence and business behavior into services or CRUD helpers.
+- Keep request schemas, update schemas, and response schemas separate.
+- Keep database sessions and auth in dependencies.
+
+## Async
+
+- Use `async def` for endpoints that perform I/O.
+- Use async database and HTTP clients from async endpoints.
+- Do not call `requests`, sync SQLAlchemy sessions, or blocking file/network operations from async routes.
+
+## Dependency Injection
+
+```python
+@router.get("/users/{user_id}")
+async def get_user(
+    user_id: str,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    ...
+```
+
+Do not create `SessionLocal()` or long-lived clients inside route handlers.
+
+## Schemas
+
+- Never include passwords, password hashes, access tokens, refresh tokens, or internal auth state in response models.
+- Use `response_model` on endpoints that return application data.
+- Use field constraints instead of hand-written validation when Pydantic can express the rule.
+
+## Security
+
+- Keep CORS origins environment-specific.
+- Do not combine wildcard origins with credentialed CORS.
+- Validate JWT expiry, issuer, audience, and algorithm.
+- Rate-limit auth and write-heavy endpoints.
+- Redact credentials, cookies, authorization headers, and tokens from logs.
+
+## Testing
+
+- Override the exact dependency used by `Depends`.
+- Clear `app.dependency_overrides` after tests.
+- Prefer async test clients for async applications.
+
+See skill: `fastapi-patterns`.
diff --git a/skills/fastapi-patterns/SKILL.md b/skills/fastapi-patterns/SKILL.md
new file mode 100644
index 00000000..541a06b7
--- /dev/null
+++ b/skills/fastapi-patterns/SKILL.md
@@ -0,0 +1,327 @@
+---
+name: fastapi-patterns
+description: FastAPI patterns for async APIs, dependency injection, Pydantic request and response models, OpenAPI docs, tests, security, and production readiness.
+origin: community
+---
+
+# FastAPI Patterns
+
+Production-oriented patterns for FastAPI services.
+
+## When to Use
+
+- Building or reviewing a FastAPI app.
+- Splitting routers, schemas, dependencies, and database access.
+- Writing async endpoints that call a database or external service.
+- Adding authentication, authorization, OpenAPI docs, tests, or deployment settings.
+- Checking a FastAPI PR for copy-pasteable examples and production risks.
+
+## How It Works
+
+Treat the FastAPI app as a thin HTTP layer over explicit dependencies and service code:
+
+- `main.py` owns app construction, middleware, exception handlers, and router registration.
+- `schemas/` owns Pydantic request and response models.
+- `dependencies.py` owns database, auth, pagination, and request-scoped dependencies.
+- `services/` or `crud/` owns business and persistence operations.
+- `tests/` overrides dependencies instead of opening production resources.
+
+Prefer small routers and explicit `response_model` declarations. Keep raw ORM objects, secrets, and framework globals out of response schemas.
+
+## Project Layout
+
+```text
+app/
+|-- main.py
+|-- config.py
+|-- dependencies.py
+|-- exceptions.py
+|-- api/
+|   `-- routes/
+|       |-- users.py
+|       `-- health.py
+|-- core/
+|   |-- security.py
+|   `-- middleware.py
+|-- db/
+|   |-- session.py
+|   `-- crud.py
+|-- models/
+|-- schemas/
+`-- tests/
+```
+
+## Application Factory
+
+Use a factory so tests and workers can build the app with controlled settings.
+
+```python
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.routes import health, users
+from app.config import settings
+from app.db.session import close_db, init_db
+from app.exceptions import register_exception_handlers
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    await init_db()
+    yield
+    await close_db()
+
+
+def create_app() -> FastAPI:
+    app = FastAPI(
+        title=settings.api_title,
+        version=settings.api_version,
+        lifespan=lifespan,
+    )
+
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=settings.cors_origins,
+        allow_credentials=bool(settings.cors_origins),
+        allow_methods=["GET", "POST", "PUT", "PATCH", "DELETE"],
+        allow_headers=["Authorization", "Content-Type"],
+    )
+
+    register_exception_handlers(app)
+    app.include_router(health.router, prefix="/health", tags=["health"])
+    app.include_router(users.router, prefix="/api/v1/users", tags=["users"])
+    return app
+
+
+app = create_app()
+```
+
+Do not use `allow_origins=["*"]` with `allow_credentials=True`; browsers reject that combination and Starlette disallows it for credentialed requests.
+
+## Pydantic Schemas
+
+Keep request, update, and response models separate.
+
+```python
+from datetime import datetime
+from typing import Annotated
+from uuid import UUID
+
+from pydantic import BaseModel, ConfigDict, EmailStr, Field
+
+
+class UserBase(BaseModel):
+    email: EmailStr
+    full_name: Annotated[str, Field(min_length=1, max_length=100)]
+
+
+class UserCreate(UserBase):
+    password: Annotated[str, Field(min_length=12, max_length=128)]
+
+
+class UserUpdate(BaseModel):
+    email: EmailStr | None = None
+    full_name: Annotated[str | None, Field(min_length=1, max_length=100)] = None
+
+
+class UserResponse(UserBase):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: UUID
+    created_at: datetime
+    updated_at: datetime
+```
+
+Response models must never include password hashes, access tokens, refresh tokens, or internal authorization state.
+
+## Dependencies
+
+Use dependency injection for request-scoped resources.
+
+```python
+from collections.abc import AsyncIterator
+from uuid import UUID
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.security import decode_token
+from app.db.session import session_factory
+from app.models.user import User
+
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login")
+
+
+async def get_db() -> AsyncIterator[AsyncSession]:
+    async with session_factory() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+
+
+async def get_current_user(
+    token: str = Depends(oauth2_scheme),
+    db: AsyncSession = Depends(get_db),
+) -> User:
+    payload = decode_token(token)
+    user_id = UUID(payload["sub"])
+    user = await db.get(User, user_id)
+    if user is None:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")
+    return user
+```
+
+Avoid creating sessions, clients, or credentials inline inside route handlers.
+
+## Async Endpoints
+
+Keep route handlers async when they perform I/O, and use async libraries inside them.
+
+```python
+from fastapi import APIRouter, Depends, Query
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.dependencies import get_current_user, get_db
+from app.models.user import User
+from app.schemas.user import UserResponse
+
+
+router = APIRouter()
+
+
+@router.get("/", response_model=list[UserResponse])
+async def list_users(
+    limit: int = Query(default=50, ge=1, le=100),
+    offset: int = Query(default=0, ge=0),
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    result = await db.execute(
+        select(User).order_by(User.created_at.desc()).limit(limit).offset(offset)
+    )
+    return result.scalars().all()
+```
+
+Use `httpx.AsyncClient` for external HTTP calls from async handlers. Do not call `requests` in an async route.
+
+## Error Handling
+
+Centralize domain exceptions and keep response shapes stable.
+
+```python
+from fastapi import FastAPI, Request
+from fastapi.responses import JSONResponse
+
+
+class ApiError(Exception):
+    def __init__(self, status_code: int, code: str, message: str):
+        self.status_code = status_code
+        self.code = code
+        self.message = message
+
+
+def register_exception_handlers(app: FastAPI) -> None:
+    @app.exception_handler(ApiError)
+    async def api_error_handler(request: Request, exc: ApiError):
+        return JSONResponse(
+            status_code=exc.status_code,
+            content={"error": {"code": exc.code, "message": exc.message}},
+        )
+```
+
+## OpenAPI Customization
+
+Assign the custom OpenAPI callable to `app.openapi`; do not just call the function once.
+
+```python
+from fastapi import FastAPI
+from fastapi.openapi.utils import get_openapi
+
+
+def install_openapi(app: FastAPI) -> None:
+    def custom_openapi():
+        if app.openapi_schema:
+            return app.openapi_schema
+        app.openapi_schema = get_openapi(
+            title="Service API",
+            version="1.0.0",
+            routes=app.routes,
+        )
+        return app.openapi_schema
+
+    app.openapi = custom_openapi
+```
+
+## Testing
+
+Override the dependency used by `Depends`, not an internal helper that route handlers never reference.
+
+```python
+import pytest
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.dependencies import get_db
+from app.main import create_app
+
+
+@pytest.fixture
+async def client(test_session: AsyncSession):
+    app = create_app()
+
+    async def override_get_db():
+        yield test_session
+
+    app.dependency_overrides[get_db] = override_get_db
+    async with AsyncClient(
+        transport=ASGITransport(app=app),
+        base_url="http://test",
+    ) as test_client:
+        yield test_client
+    app.dependency_overrides.clear()
+```
+
+## Security Checklist
+
+- Hash passwords with `argon2-cffi`, `bcrypt`, or a current passlib-compatible hasher.
+- Validate JWT issuer, audience, expiry, and signing algorithm.
+- Keep CORS origins environment-specific.
+- Put rate limits on auth and write-heavy endpoints.
+- Use Pydantic models for all request bodies.
+- Use ORM parameter binding or SQLAlchemy Core expressions; never build SQL with f-strings.
+- Redact tokens, authorization headers, cookies, and passwords from logs.
+- Run dependency audit tooling in CI.
+
+## Performance Checklist
+
+- Configure database connection pooling explicitly.
+- Add pagination to list endpoints.
+- Watch for N+1 queries and use eager loading intentionally.
+- Use async HTTP/database clients in async paths.
+- Add compression only after checking payload size and CPU tradeoffs.
+- Cache stable expensive reads behind explicit invalidation.
+
+## Examples
+
+Use these examples as patterns, not as project-wide templates:
+
+- Application factory: configure middleware and routers once in `create_app`.
+- Schema split: `UserCreate`, `UserUpdate`, and `UserResponse` have different responsibilities.
+- Dependency override: tests override `get_db` directly.
+- OpenAPI customization: assign `app.openapi = custom_openapi`.
+
+## See Also
+
+- Agent: `fastapi-reviewer`
+- Command: `/fastapi-review`
+- Skill: `python-patterns`
+- Skill: `python-testing`
+- Skill: `api-design`