matimo: Agent for Claude Code

.github/agents/matimo-tool-creator-refactored.agent.md

Matimo Tool Creator is an agent for Claude Code from tallclub/matimo. It costs 48 tokens per session (1,872 once invoked), scanned A, original, MIT.

A coding agent for creating Matimo provider packages in both TypeScript and Python. It follows the project's guidance, checks official API documentation, writes matching tool definitions, and runs validation and tests.

In plain words
What is it for?
Use it to design and implement a new service provider, including its tools, authentication details, examples, documentation, and quality checks.
Why use it?
It provides a consistent process for building integrations instead of relying on guessed API behavior or one SDK only. It also separates provider source work from runtime tools that may require approval.

Agent for Claude Code

Written for Claude Code: argument-hint in frontmatter. Also seen: model in frontmatter; Copilot chat-mode frontmatter (tools: vscode/*).

This is tallclub/matimo's own configuration. It tells Claude Code how to work on matimo itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything matimo configures →

Reuse

Borrowing it

Nothing to install: this file belongs to tallclub/matimo. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/tallclub/matimo/main/.github/agents/matimo-tool-creator-refactored.agent.md
Clone the repo
git clone --depth 1 https://github.com/tallclub/matimo

Made for: Claude Code.

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 Matimo Tool Creator

README.md
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Your own site
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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.

agentmods 80×15 button for Matimo Tool Creator

Your own site · 80×15
<a href="https://agentmods.dev/agents/tallclub/matimo/matimo-tool-creator-refactored"><img src="https://agentmods.dev/badge/agents/tallclub/matimo/matimo-tool-creator-refactored.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 48 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,872 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00048 $0.01872
Opus 5.5 $0.00019 $0.00749
Sonnet 5.5 $0.00010 $0.00374
Haiku 4.5 $0.00005 $0.00187

Measured 1mo ago against content hash 6b968198ea76, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Matimo Tool Creator 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 1mo 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.

.github/agents/matimo-tool-creator-refactored.agent.md · 140 lines

How it starts

The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Matimo Tool Creator Agent

Mandate

Create production-grade provider packages for Matimo in both SDKs:

  • ✅ Skill guidance from .github/skills/matimo-provider-creation/SKILL.md
  • ✅ Official API docs for every endpoint, parameter and response — never guess
  • ✅ Identical YAML in TypeScript and Python
  • ✅ Validation with matimo_validate_tool (via MCP) and pnpm validate-tools
  • ✅ Tests, examples and a SKILL.md for every package

Do not use matimo_create_tool for provider packages. It is the runtime tool for agents: it writes to ./matimo-tools/<name>/, forces status: draft and requires_approval: true, and asks a human to approve each call. Provider tools are source files you write in the package directory and review in a pull request.


Workflow

Step 1: Research and clarify

  1. Read .github/skills/matimo-provider-creation/SKILL.md.
  2. Fetch the official API documentation the user gave you.
  3. Ask about scope, auth and rate limits if anything is unclear.
  4. Check whether typescript/packages/<provider>/ already exists.

Stop if critical API details are missing.

Step 2: Design

  1. Lay out the package as in Skill § Part 1.
  2. Draft each tool's YAML following Skill § Part 2 (HTTP by default).
  3. Give every tool a risk classification: requires_approval: true on deletes and other destructive calls, risk: on function tools.
  4. Confirm the tool list with the user.

Step 3: Write each tool

A. Write the YAML with edit/createFile:

  • typescript/packages/<provider>/tools/<tool>/definition.yaml
  • python/packages/<provider>/src/matimo_<provider>/tools/<tool>/definition.yaml (same content)

B. Validate it with matimo_validate_tool (via MCP):

Tool: matimo_validate_tool
Input: { yaml_content: "<the full YAML>" }
Output: { valid, schemaErrors, policyViolations, riskLevel }

policyViolations describe the rules for agent-created tools. A provider tool can legitimately differ (for example requires_approval: true with status unset, or a DELETE method); fix every schemaErrors entry, and treat policy violations as a prompt to double-check, not a blocker.

Read the full file on GitHub · 140 lines

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. 1mo ago First seen · 140 lines · 48 tokens per session scan A 6b968198ea76

Subscribe to this mod's changes

Matimo Tool Creator is an agent published in the GitHub repository tallclub/matimo (18 stars, last pushed yesterday), licensed MIT. It adds 48 tokens to every session and 1,872 once invoked, about $0.0002 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 2026-10-05.

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