matimo: Skill for Claude Code

.claude/skills/add-package/SKILL.md

add-package is a skill for Claude Code from tallclub/matimo. It costs 0 tokens per session (1,144 once invoked), scanned A, original, MIT.

A workflow for creating a new Matimo provider package, which connects Matimo to an outside service. It covers package scaffolding, authentication setup, API tools, documentation, tests, and workspace registration.

In plain words
What is it for?
Use it to add a provider such as a LinkedIn, Stripe, or Twitter/X integration to Matimo's TypeScript and Python workspaces.
Why use it?
It replaces a collection of manual setup steps with one documented process. It also prompts the developer to check existing work and official API details before implementing the package.

Skill for Claude Code

Written for Claude Code: $ARGUMENTS substitution.

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/.claude/skills/add-package/SKILL.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 add-package

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.

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Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,144 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 $0.00000 $0.01144
Opus 5.5 $0.00000 $0.00458
Sonnet 5.5 $0.00000 $0.00229
Haiku 4.5 $0.00000 $0.00114

Measured 1mo ago against content hash 0cc5478e2156, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-package 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.

.claude/skills/add-package/SKILL.md · 175 lines

How it starts

The opening of the file, as written. The whole thing — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add a new Matimo provider package: $ARGUMENTS

If no provider specified, ask: which provider (e.g. LinkedIn, Stripe, Twitter/X), and which tools to include in the first release.


Step 1 — Check for existing WIP implementation

Look in typescript/packages/ first:

ls typescript/packages/

If typescript/packages/<name>/ exists, examine its tool YAML files. These can be adapted — they may just need schema fixes and Python executors added. Validate them: pnpm validate-tools.

If no existing implementation, scaffold from scratch (use packages/slack/ as the reference template).


Step 2 — Fetch official API docs

Use WebSearch / WebFetch to get the real API reference. Document:

  • Base URL
  • Authentication method (API key, OAuth2, Basic, Bearer)
  • Rate limits
  • Available endpoints — pick the highest-value ones for v1 (aim for 3–8 tools)

Step 3 — Create package directory structure

packages/<name>/
├── package.json
├── definition.yaml          # OAuth2 provider config (omit if API key auth only)
├── tools/
├── skills/
│   └── <name>/
│       └── SKILL.md
├── test/
│   ├── unit/
│   └── integration/
└── README.md

package.json:

{
  "name": "@matimo/<name>",
  "version": "0.1.0",
  "description": "<Provider> tools for Matimo",
  "type": "module",
  "files": ["tools", "skills", "README.md"],
  "peerDependencies": { "matimo": "workspace:*" },
  "devDependencies": { "@matimo/core": "workspace:*" }
}

Add to pnpm-workspace.yaml:

- "packages/<name>"

Step 4 — OAuth2 provider config (if OAuth2 auth)

packages/<name>/definition.yaml:

name: <name>-provider
type: provider
version: '1.0.0'
description: |
  <Provider> OAuth2 Provider Configuration
  Setup instructions here...

provider:
  name: <name>
  displayName: <Provider Name>
  oauth2:
    authorizationUrl: https://provider.com/oauth/authorize
    tokenUrl: https://provider.com/oauth/token
    scopes: [scope1, scope2]
  env:
    CLIENT_ID: <NAME>_CLIENT_ID
    CLIENT_SECRET: <NAME>_CLIENT_SECRET
    REDIRECT_URI: <NAME>_REDIRECT_URI

Read the full file on GitHub · 175 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 · 175 lines · 0 tokens per session scan A 0cc5478e2156

Subscribe to this mod's changes

add-package is a skill published in the GitHub repository tallclub/matimo (18 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,144 tokens. 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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