context7

A documentation rule tells the agent to use Context7, a documentation service, for current information about software libraries, frameworks, APIs, command-line tools, and cloud services.

In plain words
What is it for?
It helps with setup instructions, API syntax, configuration, version upgrades, and tool-specific debugging. It does not cover general programming questions or ordinary code refactoring.
Why use it?
Software documentation changes, and remembered examples may be outdated or wrong. The rule directs the agent to check the relevant documentation before answering certain technical questions.

Cursor rule for Cursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/tam159/next-role/context7
Clone the repo
git clone --depth 1 https://github.com/tam159/next-role

Made for: Cursor.

Per session 251 This file is loaded in full into every session.
When invoked 251 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00251 $0.00251
Opus 5 $0.00125 $0.00125
Sonnet 5 $0.00050 $0.00050
Haiku 4.5 $0.00025 $0.00025

Measured yesterday against content hash 802e59baee78, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

context7 scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/context7.mdc · 28 lines

What it actually says

Context7 Documentation Rule

Use Context7 MCP to fetch current documentation whenever the user asks about a library, framework, SDK, API, CLI tool, or cloud service. This includes API syntax, configuration, version migrations, library-specific debugging, setup instructions, and CLI usage.

Use Context7 even for familiar tools such as React, Next.js, Prisma, Express, Tailwind, Django, or Spring Boot. Prefer it over web search for library docs.

Do not use Context7 for refactoring, writing scripts from scratch, debugging business logic, code review, or general programming concepts.

Workflow:

  1. Start with resolve-library-id using the library name and the user's question, unless the user provides an exact library ID in /org/project format.
  2. Pick the best match by exact name, relevance, snippet count, source reputation, and benchmark score.
  3. Query docs with the selected library ID and the user's full question.
  4. If the answer is not good enough, query again with research mode when available.
  5. Answer using the fetched docs.
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 28 lines · 251 tokens per session scan A 802e59baee78

Subscribe to this mod's changes

context7 is a cursor rule published in the GitHub repository tam159/next-role (48 stars, last pushed 2d ago), licensed MIT. It adds 251 tokens to every session, about $0.0013 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.