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.
npx skills add tallclub/matimo --skill tool-discoverygit clone --depth 1 https://github.com/tallclub/matimoWrote 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.
[](https://agentmods.dev/skills/tallclub/matimo/tool-discovery)<a href="https://agentmods.dev/skills/tallclub/matimo/tool-discovery"><img src="https://agentmods.dev/badge/skills/tallclub/matimo/tool-discovery.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 4 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 168 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 206 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Excessive Agency · line 175 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- medium Data Exfiltration · line 187 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00033 | $0.03050 |
| Opus 5 | $0.00016 | $0.01525 |
| Sonnet 5 | $0.00007 | $0.00610 |
| Haiku 4.5 | $0.00003 | $0.00305 |
Grade A, and why
tool-discovery 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 499 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tool Discovery: Finding and Managing Tools
This skill teaches you how to discover, search, and manage Matimo tools that are available in your system.
Overview: Tool Sources
Three sources of tools:
-
Core/Built-in Tools — Shipped with Matimo SDK
matimo_create_tool,matimo_validate_tool,matimo_doctor, etc.- Read-only, always available
- Used by agents to manage tool lifecycle
-
Provider Tools — Application-specific tools from packages
- Slack tools, GitHub tools, AWS tools, etc.
- Defined in
packages/{provider}/tools/ - Available after initialization with
toolPaths
-
User-Created Tools — Dynamically created by agents
- Stored in
target_dir(usually temp directory) - Status:
draft,approved,rejected - Discovered via
matimo_list_user_tools
- Stored in
Meta-Tool: matimo_list_user_tools
Lists all tools created by agents in a specific directory.
Input: { target_dir: "/path/to/tools" }
Output: { tools: [...] status: "success" }
Basic Usage
Call: matimo_list_user_tools(target_dir="/tmp/my-tools")
Response:
{
"tools": [
{
"name": "weather_fetch",
"version": "1.0.0",
"description": "Get current weather for a city",
"status": "approved",
"riskLevel": "LOW",
"createdAt": "2026-03-17T10:30:00Z",
"executionType": "http",
"requiresApproval": false
},
{
"name": "file_reader",
"version": "1.0.0",
"description": "Read files from filesystem",
"status": "rejected",
"riskLevel": "CRITICAL",
"reason": "Command tools are blocked by policy",
"createdAt": "2026-03-17T10:31:00Z",
"executionType": "command",
"requiresApproval": true
}
],
"summary": {
"total": 2,
"approved": 1,
"rejected": 1,
"draft": 0
}
}
Understanding Tool Status
Status: approved
Tool has been validated and approved by human operator. Ready to use.
Indicators:
- ✅ Created with matimo_create_tool
- ✅ Passed matimo_doctor validation
- ✅ Human approved via matimo_review
- ✅ Registry reloaded via matimo_reload_tools
- ✅ Executable via matimo.execute()
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.
- 8d ago First seen · 499 lines · 33 tokens per session scan A 9ba996e3737e
tool-discovery is a skill published in the GitHub repository tallclub/matimo (11 stars, last pushed 4d ago), licensed MIT. It adds 33 tokens to every session and 3,050 once invoked, about $0.0002 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 2026-08-30.
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