documentation-lookup

documentation-lookup is a skill for Claude Code, Codex from krmcbride/claude-plugins. It costs 34 tokens per session (380 once invoked), scanned A, original, MIT.

A skill for finding and retrieving documentation for libraries and software frameworks, including usage guidance and code examples.

In plain words
What is it for?
Use it when checking official or reference documentation for a package, framework feature, API, or integration.
Why use it?
It gives the agent a defined way to look up unfamiliar APIs when the library’s source code is not available locally.

Skill for Claude CodeCodex

Part of the essentials plugin — 4 skills, 4 commands, 1 agent shipped together

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 skills/krmcbride/claude-plugins/documentation-lookup
Any agent
npx skills add krmcbride/claude-plugins --skill documentation-lookup
Clone the repo
git clone --depth 1 https://github.com/krmcbride/claude-plugins

Made for: Claude Code, Codex.

Or install essentials, the plugin that ships this one along with the rest of its 4 skills, 4 commands, 1 agent.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for documentation-lookup

README.md
[![agentmods](https://agentmods.dev/badge/skills/krmcbride/claude-plugins/documentation-lookup.svg)](https://agentmods.dev/skills/krmcbride/claude-plugins/documentation-lookup)
Your own site
<a href="https://agentmods.dev/skills/krmcbride/claude-plugins/documentation-lookup"><img src="https://agentmods.dev/badge/skills/krmcbride/claude-plugins/documentation-lookup.svg" alt="Measured on agentmods" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 380 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00034 $0.00380
Opus 5 $0.00017 $0.00190
Sonnet 5 $0.00007 $0.00076
Haiku 4.5 $0.00003 $0.00038

Measured 4d ago against content hash f6b17607fea3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

documentation-lookup scanned grade A with 1 finding 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 4d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s "https://context7.com/api/v2/search?query={library_name}" | jq '.results[:3]'
essentials/skills/documentation-lookup/SKILL.md · 55 lines

What it actually says

Documentation Lookup

When to activate:

  • User says "check the docs"
  • User needs API documentation or code examples
  • User mentions a library/framework name
  • Source code of a library is not available locally

Two-step process:

Step 1: Find the library ID

Search for the library to get its context7 ID:

curl -s "https://context7.com/api/v2/search?query={library_name}" | jq '.results[:3]'

Example - searching for "react":

curl -s "https://context7.com/api/v2/search?query=react" | jq '.results[:3] | .[] | {id, title}'

This returns matching libraries. Use the id field (e.g., /facebook/react or /websites/react_dev).

Step 2: Fetch documentation

Use the library ID from step 1:

curl -s "https://context7.com/api/v2/docs/code{library_id}?topic={topic}&page=1"

Example - fetching React hooks docs:

curl -s "https://context7.com/api/v2/docs/code/facebook/react?topic=hooks&page=1"

Parameters:

  • topic - Focus area (e.g., hooks, routing, authentication)
  • page - Pagination (1-10), use if first page doesn't have enough info

Response: Returns markdown-formatted documentation snippets with code examples.

Fallback: If context7 doesn't have the library or returns errors, use web search.

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. 4d ago First seen · 55 lines · 34 tokens per session scan A f6b17607fea3

Subscribe to this mod's changes

documentation-lookup is a skill published in the GitHub repository krmcbride/claude-plugins (3 stars, last pushed 8mo ago), licensed MIT. It adds 34 tokens to every session and 380 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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