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 agentmods add skills/rand/cc-polymath/discover-mcpnpx skills add rand/cc-polymath --skill discover-mcpgit clone --depth 1 https://github.com/rand/cc-polymathWrote 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/rand/cc-polymath/discover-mcp)<a href="https://agentmods.dev/skills/rand/cc-polymath/discover-mcp"><img src="https://agentmods.dev/badge/skills/rand/cc-polymath/discover-mcp.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 | $0.00039 | $0.00875 |
| Opus 5 | $0.00019 | $0.00438 |
| Sonnet 5 | $0.00008 | $0.00175 |
| Haiku 4.5 | $0.00004 | $0.00088 |
Grade A, and why
discover-mcp 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 4d 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 — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Skills Discovery
Provides automatic access to comprehensive MCP server development, tool design, and testing skills.
When This Skill Activates
This skill auto-activates when you're working with:
- Building MCP servers (TypeScript or Python)
- Designing MCP tools, resources, or prompts
- Choosing MCP transports (stdio, SSE, Streamable HTTP)
- Implementing JSON-RPC 2.0 over MCP
- Testing MCP servers with Inspector or automated tests
- Debugging MCP protocol or transport issues
- Publishing or deploying MCP servers
Available Skills
Quick Reference
The MCP category contains 3 specialized skills:
- mcp-server-fundamentals - Architecture, transports, tools/resources/prompts primitives, SDK setup
- mcp-tool-design - Tool naming, schemas, error handling, annotations, progressive disclosure
- mcp-testing - Inspector, unit tests, integration tests, transport debugging, CI/CD
Load Full Category Details
For complete descriptions and workflows:
Read ../mcp/INDEX.md
This loads the full MCP category index with:
- Detailed skill descriptions
- Usage triggers for each skill
- Common workflow combinations
- Cross-references to related skills
Load Specific Skills
Load individual skills as needed:
Server architecture and setup
Read ../mcp/mcp-server-fundamentals.md
Tool design and best practices
Read ../mcp/mcp-tool-design.md
Testing and debugging
Read ../mcp/mcp-testing.md
Common Workflows
New MCP Server
Sequence: Fundamentals -> Tool Design -> Testing
Read ../mcp/mcp-server-fundamentals.md # Architecture, transport, SDK Read ../mcp/mcp-tool-design.md # Design tool interfaces Read ../mcp/mcp-testing.md # Test with Inspector, CI
Adding Tools to Existing Server
Sequence: Tool Design -> Testing
Read ../mcp/mcp-tool-design.md # Naming, schemas, errors Read ../mcp/mcp-testing.md # Test new tools
Debugging MCP Issues
Sequence: Testing -> Fundamentals
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.
- 4d ago First seen · 132 lines · 39 tokens per session scan A 8928ca09e78b
discover-mcp is a skill published in the GitHub repository rand/cc-polymath (140 stars, last pushed 6mo ago), licensed MIT. It adds 39 tokens to every session and 875 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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