context7

Rules for looking up current package and framework documentation through Context7, a documentation-search service.

In plain words
What is it for?
Use them before adding or upgrading npm packages, adopting framework features, or deciding whether a technical pattern is still current.
Why use it?
They reduce the risk of relying on outdated APIs or practices when adding dependencies, upgrading packages, or using unfamiliar features.

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/vola-trebla/playwright-trace-decoder-mcp/context7
Clone the repo
git clone --depth 1 https://github.com/vola-trebla/playwright-trace-decoder-mcp

Made for: Cursor.

Per session 173 This file is loaded in full into every session.
When invoked 173 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 $0.00173 $0.00173
Opus 5 $0.00086 $0.00086
Sonnet 5 $0.00035 $0.00035
Haiku 4.5 $0.00017 $0.00017

Measured 2d ago against content hash a8df21484eec, 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 2d ago.

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 · 25 lines

What it actually says

Context7 MCP

Before using a new package or adopting a new practice, always query Context7 for up-to-date docs.

When to use

  • Adding a new npm dependency — check the current API before writing any code
  • Upgrading an existing package — verify breaking changes and new patterns
  • Using a framework feature you haven't touched recently (MCP SDK, Zod, etc.)
  • Unsure whether a pattern is current or outdated

How

mcp__claude_ai_Context7__resolve-library-id  →  mcp__claude_ai_Context7__query-docs

Always resolve the library ID first, then query docs with a specific question. Don't rely on training data alone — APIs change.

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. 2d ago First seen · 25 lines · 173 tokens per session scan A a8df21484eec

Subscribe to this mod's changes

context7 is a cursor rule published in the GitHub repository vola-trebla/playwright-trace-decoder-mcp (1 stars, last pushed 3mo ago), licensed MIT. It adds 173 tokens to every session, about $0.0009 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 2026-08-31.