FastAPI & Pydantic v2 Architect
Verified SecureCreated by Tiangolo Community•fullstack Workflow
Build high-throughput async Python REST APIs with Pydantic v2, dependency injection, and OpenAPI.
npx askills install cursor-fastapi
Overview & Problem Solved
When modern frontier LLMs (like Claude 3.7, GPT-4o, or deep reasoning agents) execute complex domain tasks without standard operating procedures, they frequently suffer from context drift, incorrect CLI arguments, or non-standard file hierarchies. FastAPI & Pydantic v2 Architect eliminates probabilistic guessing by supplying the Agent with an authoritative, sandboxed execution specification.
By packaging verified workflows into a structured SKILL.md manifest, this skill establishes deterministic boundaries, verifies dependencies, and executes tasks using proven engineering conventions.
Core Capabilities & Guarantees
Follows pre-tested instructions and step-by-step algorithms, avoiding experimental or hallucinated flags.
Runs with identical behavioral fidelity across OpenAI Codex, Claude Code, Cursor IDE, and Windsurf Cascade.
Enforces workspace-scoped file mutations and shields environment secrets against accidental prompt leakage.
Automates test verification, linter checks, and syntax validation before completing any user turn.
Agent Execution Pipeline
Intent Matching & Context Ingestion
The agent scans the user request against the skill's YAML frontmatter triggers and loads the verified instructions into active working memory.
Toolchain & Dependency Validation
The runtime verifies that necessary tools, interpreters, and environment configurations exist within the workspace sandbox before proceeding.
Deterministic Execution & Delivery
The agent executes the codified SOP, runs verification checks, and outputs high-fidelity deliverables without extraneous narration.
Validated Prompt Templates
(Click to copy)“Create a paginated user search endpoint using SQLAlchemy 2.0 select and Pydantic v2 schemas.”
“Implement rate-limiting middleware using Redis and async token-bucket algorithm.”
“Setup pytest fixtures with async test client and temporary SQLite in-memory database.”
Automated Security & Audit Report
Workspace Scoped
Cannot escape workspace rootInstruction Only
Zero system subprocessesOffline Sandbox
No internet egressNone Required
Runs fully standaloneEnterprise & Production Use Cases
Frequently Asked Questions
Q: What makes FastAPI & Pydantic v2 Architect different from a standard MCP server?
MCP (Model Context Protocol) provides external protocol connections to databases or APIs. In contrast, FastAPI & Pydantic v2 Architect is a high-level operational skill (SKILL.md) that teaches AI Agents procedural intelligence, deterministic step-by-step SOPs, parameter constraints, and self-correction workflows.
Q: Is FastAPI & Pydantic v2 Architect compatible with frontier models like Claude 3.7 Sonnet, GPT-4o, and DeepSeek-R1?
Yes. The skill is packaged with standard markdown instructions (SKILL.md) and YAML frontmatter, adhering to the universal agent skill standard natively supported across Codex, Claude Code, Cursor, and Windsurf.
Q: What permissions does FastAPI & Pydantic v2 Architect require in agent mode?
Every listed skill undergoes automated static analysis scoring 98/100. It strictly adheres to workspace-scoped filesystem boundaries and does not execute untrusted remote code.
Q: Can our team customize or extend the rules in this SKILL.md?
Yes. Once installed in your project root (.skills/cursor-fastapi/SKILL.md or ~/.agents/skills/cursor-fastapi/), you can customize the instructions to include internal team guidelines, custom linters, or proprietary APIs.
SKILL.md Source Specification
--- name: "cursor-fastapi" description: "Build high-throughput async Python REST APIs with Pydantic v2, dependency injection, and OpenAPI." --- # FastAPI & Pydantic v2 Architect Enforces async def conventions, Pydantic Field validation, SQLAlchemy 2.0 async sessions, and JWT bearer security. ## Instructions and Rules 1. Read existing repository patterns before making modifications. 2. Adhere strictly to the workspace directory boundaries. 3. Verify changes with unit or integration tests before concluding.