Borrowing it
Nothing to install: this file belongs to berntpopp/genefoundry-router. 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/berntpopp/genefoundry-router/main/.claude/skills/tool-search-change/SKILL.mdgit clone --depth 1 https://github.com/berntpopp/genefoundry-routerWrote 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/berntpopp/genefoundry-router/tool-search-change)<a href="https://agentmods.dev/skills/berntpopp/genefoundry-router/tool-search-change"><img src="https://agentmods.dev/badge/skills/berntpopp/genefoundry-router/tool-search-change/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/berntpopp/genefoundry-router/tool-search-change"><img src="https://agentmods.dev/badge/skills/berntpopp/genefoundry-router/tool-search-change.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 | $0.00042 | $0.00358 |
| Opus 5.5 | $0.00017 | $0.00143 |
| Sonnet 5.5 | $0.00008 | $0.00072 |
| Haiku 4.5 | $0.00004 | $0.00036 |
Grade A, and why
tool-search-change 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.
What it actually says
Tool-Search Change
Follow AGENTS.md first. The router doesn't author backend tools; it exposes two synthetic meta-tools over the federated fleet — search_tools (BM25 discovery, token-lean serialization) and call_tool (invoke a discovered tool by name) — in tool_search.py, plus discovery hints/normalization in hints.py / normalization.py / discovery.py.
Workflow
- Work in
tool_search.py(search_tools/call_tool), anddiscovery.py/hints.py/normalization.pyfor the catalog and rewrites. - Keep
search_toolsoutput token-lean (the default serialization drops_metaand trims to a one-linereturns); don't regress payload size. - Preserve the pinned entrypoints (the common first-call tools) and the
search_tools -> call_toolcontract in the tool descriptions. - Regenerate the discovery catalog (
make snapshot-catalog) and keep golden-task / guard tests green;make list-toolsto sanity-check the surface. - Tune
GF_SEARCH_MAX_RESULTS/GF_REWRITE_HINTSvia config, not hard-coded values. Runmake ci-local.
Common mistakes
- Bloating
search_toolsresults with full schemas/_meta— it's the token-lean discovery path. - Breaking the
search_tools -> call_toolhandshake the tool descriptions promise.
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.
- 1mo ago First seen · 22 lines · 42 tokens per session scan A dde83f5ecd93
tool-search-change is a skill published in the GitHub repository berntpopp/genefoundry-router (6 stars, last pushed 2d ago), licensed MIT. It adds 42 tokens to every session and 358 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.
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