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 preset-io/agent-skills --skill preset-mcp-discoverygit clone --depth 1 https://github.com/preset-io/agent-skillsWrote 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/preset-io/agent-skills/preset-mcp-discovery)<a href="https://agentmods.dev/skills/preset-io/agent-skills/preset-mcp-discovery"><img src="https://agentmods.dev/badge/skills/preset-io/agent-skills/preset-mcp-discovery/github.svg" alt="Measured on agentmods" height="20"></a>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.
<a href="https://agentmods.dev/skills/preset-io/agent-skills/preset-mcp-discovery"><img src="https://agentmods.dev/badge/skills/preset-io/agent-skills/preset-mcp-discovery.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00041 | $0.00402 |
| Opus 5 | $0.00020 | $0.00201 |
| Sonnet 5 | $0.00008 | $0.00080 |
| Haiku 4.5 | $0.00004 | $0.00040 |
Grade A, and why
preset-mcp-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 13d 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
preset-mcp-discovery
Use for MCP metadata discovery that does not require result data or persistent changes.
Always
- Use the single narrowest tool that answers the question; discovery calls are for missing IDs, names, or schemas — not a mandatory ladder.
- Do not repeat an identical list call; reuse earlier results. Following pagination or refining a search filter when the target was not in the returned page is fine.
- When a call fails on filter, sort, pagination, or request wrapper fields, fix it against the live tool schema rather than guessing again.
- Do not expose hidden dataset, database, schema, or SQL details after permission errors.
Decision Rules
- Use
health_checkandget_instance_infoonly when the user asks about service health or the workspace itself. - Use
list_*tools once to find IDs when the identifier is missing; pick apage_sizethat covers the request in one call. - Use
get_*_infofor details of a specific known object. - Use
get_schemaonly when a request fails or valid filter/sort/select fields are genuinely unknown.
Workflow Order
- If the needed ID, UUID, slug, or other schema-accepted identifier is already known, skip listing and act on it. Resolve a bare display name with one list/search call.
- Otherwise list/search once for the object type in question.
- Fetch details only for the specific object needed.
- Route to
preset-mcp-datafor result rows, chart data, previews, or rendered SQL. - Route to mutation-focused skills before creating or updating objects.
Retrieve
- Discovery tool map: references/discovery-tools.md
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 13d ago First seen · 35 lines · 41 tokens per session scan A c7f063e8b27a
preset-mcp-discovery is a skill published in the GitHub repository preset-io/agent-skills (11 stars, last pushed 2d ago), licensed Apache-2.0. It adds 41 tokens to every session and 402 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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