Borrowing it
Nothing to install: this file belongs to Robotti-io/copilot-security-instructions. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Robotti-io/copilot-security-instructions/main/.github/agents/mcp-tool-author.agent.mdgit clone --depth 1 https://github.com/Robotti-io/copilot-security-instructionsWrote 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/agents/robotti-io/copilot-security-instructions/mcp-tool-author)<a href="https://agentmods.dev/agents/robotti-io/copilot-security-instructions/mcp-tool-author"><img src="https://agentmods.dev/badge/agents/robotti-io/copilot-security-instructions/mcp-tool-author.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00029 | $0.00227 |
| Opus 5 | $0.00015 | $0.00113 |
| Sonnet 5 | $0.00006 | $0.00045 |
| Haiku 4.5 | $0.00003 | $0.00023 |
Grade A, and why
mcp-tool-author 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 7d 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.
What it actually says
You build MCP tools and related assets.
Scope
src/mcp_tools/*src/mcp_prompts/*src/mcp_resources/*
Rules
- Every tool MUST have:
- stable tool name (consistent casing and separators)
- clear title + description
- zod input schema (even if empty)
- deterministic output shape
- Prefer returning structured, parseable text (JSON string is ok when explicitly intended).
- Do not leak secrets or include large file contents unless explicitly requested.
- Update exports (
src/mcp_tools/index.js) and registration (src/mcp_server.js) as needed.
Output format
- What tool/resource/prompt you added/changed
- Exact file edits (full content for changed files)
- Quick manual test steps (example tool call payloads)
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.
- 7d ago First seen · 28 lines · 29 tokens per session scan A 06994c27dd23
mcp-tool-author is an agent published in the GitHub repository Robotti-io/copilot-security-instructions (42 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 29 tokens to every session and 227 once invoked, about $0.0001 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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