Library Documentation Skill
Fetches official library documentation with 60-90% token savings.
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)
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 |
EXECUTION
# With known library ID (faster - saves 1 API call)
bash scripts/fetch-docs.sh --library-id <id> --topic "<topic>" --content-type <types>
# With library name (auto-resolves)
bash scripts/fetch-docs.sh --library <name> --topic "<topic>" --content-type <types>
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.
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.
REFERENCES
