tool-search-tool changedagents-and-tools/tool-use/tool-search-tool
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1111* **Context bloat:** A typical multiserver setup (GitHub, Slack, Sentry, Grafana, and Splunk) can consume \~55k tokens in definitions before Claude does any work. Tool search typically reduces this by over 85 percent, loading only the 3–5 tools Claude needs for a given request.
1212* **Tool selection accuracy:** Claude's ability to pick the right tool degrades once you exceed 30–50 available tools. Because tool search loads only a focused set of relevant tools on demand, selection accuracy stays high even across thousands of tools.
1313
14Tool search is generally available on the Claude API. For supported models, see [Model compatibility](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool#model-compatibility).
14For the models that support tool search, see [Model compatibility](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool#model-compatibility).
1515
1616<Tip>
1717 For background on the scaling challenges that tool search solves, see [Advanced tool use](https://www.anthropic.com/engineering/advanced-tool-use). Tool search's on-demand loading is also an instance of the broader just-in-time retrieval principle described in [Effective context engineering](https://www.anthropic.com/engineering/effective-context-engineering-for-ai-agents).
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7878<CodeGroup>
7979 ```bash cURL
8080 curl https://api.anthropic.com/v1/messages \
81 --header "x-api-key: $ANTHROPIC_API_KEY" \
82 --header "anthropic-version: 2023-06-01" \
83 --header "content-type: application/json" \
84 --data '{
81 -H "x-api-key: $ANTHROPIC_API_KEY" \
82 -H "anthropic-version: 2023-06-01" \
83 -H "content-type: application/json" \
84 -d '{
8585 "model": "claude-opus-5",
8686 "max_tokens": 2048,
8787 "messages": [
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