fetch-library-docs

name

fetch-library-docs

description

Fetches official documentation for external libraries and frameworks (React, Next.js, Prisma, FastAPI, Express, Tailwind, MongoDB, etc.) with 60-90% token savings via content-type filtering. Use this skill when implementing features using library APIs, debugging library-specific errors, troubleshooting configuration issues, installing or setting up frameworks, integrating third-party packages, upgrading between library versions, or looking up correct API patterns and best practices. Triggers automatically during coding work - fetch docs before writing library code to get correct patterns, not after guessing wrong.

Library Documentation Skill

Fetches official library documentation with 60-90% token savings.

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WHEN TO INVOKE (Auto-Detection)

INVOKE AUTOMATICALLY when:

Context	Detection Signal	Content Type
Implementing	About to write code using library API	examples,api-ref
Debugging	Error contains library name (e.g., PrismaClientError)	troubleshooting
Installing	Adding new package, npm install, setup task	setup
Integrating	Connecting libraries ("use X with Y")	examples,setup
Upgrading	Version migration, breaking changes	migration
Uncertain	First use of library feature, unsure of pattern	examples

DO NOT INVOKE when:

• Already have sufficient knowledge from training
• User pasted docs or has them open
• Task is about local/private code (use codebase search)
• Comparing libraries (use web search)

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DECISION LOGIC

1. Identify Library

Priority: User mention → Error message → File imports → package.json → Ask user

Examples:

• PrismaClientKnownRequestError → library = "prisma"
• import { useState } from 'react' → library = "react"
• from fastapi import FastAPI → library = "fastapi"

2. Identify Topic

Priority: User specifies → Error message → Feature being implemented → "getting started"

3. Select Content Type

Task	Content Type
Implementing code	examples,api-ref
Debugging error	troubleshooting,examples
Installing/setup	setup
Integrating libs	examples,setup
Upgrading version	migration
Understanding why	concepts
Best practices	patterns

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EXECUTION

IMPORTANT: Always use the Python entry point (fetch-docs.py) for cross-platform compatibility.

Use python3 on Linux/macOS/WSL, python on Windows:

# With known library ID (faster - saves 1 API call)
python3 scripts/fetch-docs.py --library-id <id> --topic "<topic>" --content-type <types>

# With library name (auto-resolves)
python3 scripts/fetch-docs.py --library <name> --topic "<topic>" --content-type <types>

Windows note: Use python instead of python3 (e.g., python scripts/fetch-docs.py ...)

Quick Library IDs

Library	ID
React	/reactjs/react.dev
Next.js	/vercel/next.js
Prisma	/prisma/docs
Tailwind	/tailwindlabs/tailwindcss.com
FastAPI	/tiangolo/fastapi

See references/library-ids.md for complete list.

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ERROR HANDLING (Quick Reference)

Error	Action
[LIBRARY_NOT_FOUND]	Try spelling variations
[LIBRARY_MISMATCH]	Use --library-id directly
[EMPTY_RESULTS]	Broaden topic or use --content-type all
[RATE_LIMIT_ERROR]	Check API key setup

Call Budget: Context7 allows 3 calls/question. Use --library-id to save 1 call.

See references/context7-tools.md for full error handling.

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REFERENCES

• Library IDs - Complete library ID list
• Usage Patterns - Real-world examples
• Context7 Tools - API details, error codes, setup