A project command that detects supported programming languages and frameworks, then adds Logfire monitoring. It supports Python, JavaScript or TypeScript, and Rust, including projects that use more than one language.

Use it to instrument detected web frameworks, databases, HTTP clients, AI libraries, and other supported libraries by scanning the project's dependency files and adding the required configuration.

It removes the manual work of finding the application entry point, selecting Logfire packages, and placing setup calls in the correct order.

instrument — Command for Claude Code by pydantic/skills

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.

Clone the repo

git clone --depth 1 https://github.com/pydantic/skills

Made for: Claude Code.

Or install logfire, the plugin that ships this one along with the rest of its 10 skills, 7 commands, 1 MCP server.

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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/pydantic/skills/instrument/github.svg)](https://agentmods.dev/commands/pydantic/skills/instrument)

Your own site

<a href="https://agentmods.dev/commands/pydantic/skills/instrument"><img src="https://agentmods.dev/badge/commands/pydantic/skills/instrument/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/pydantic/skills/instrument"><img src="https://agentmods.dev/badge/commands/pydantic/skills/instrument.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 75 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00015	$0.00075
Opus 5.5	$0.00006	$0.00030
Sonnet 5.5	$0.00003	$0.00015
Haiku 4.5	$0.00002	$0.00007

Measured 26d ago against content hash e9a7f07834d0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

instrument 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 26d 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.

plugins/logfire/commands/instrument.md · 12 lines

What it actually says

/instrument

Load and follow the logfire-instrumentation skill. Treat that skill and its references as the source of truth for framework detection, authentication, project selection, implementation, and verification. The user's instructions take precedence over the skill.

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.

26d ago Changed · -44 lines e9a7f07834d0
2mo ago First seen · 56 lines · 15 tokens per session scan A f41cd594def7

Subscribe to this mod's changes

instrument is a command published in the GitHub repository pydantic/skills (151 stars, last pushed 9d ago), licensed MIT. It adds 15 tokens to every session and 75 once invoked, about $0.0001 per session on Opus 5.5. 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.

Analytics and metrics

instrument next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
instrumentpydantic/skills	Command	151	9d ago	MIT	A	15	Claude Code
checklistgithub/spec-kit	Command	148k	yesterday	MIT	A	13	Claude Code
clarifygithub/spec-kit	Command	148k	yesterday	MIT	A	27	Claude Code
specifygithub/spec-kit	Command	148k	yesterday	MIT	A	13	Claude Code
analyzegithub/spec-kit	Command	148k	yesterday	MIT	A	26	Claude Code
convergegithub/spec-kit	Command	148k	yesterday	MIT	A	35	Claude Code
implementgithub/spec-kit	Command	148k	yesterday	MIT	A	14	Claude Code