feat: defer MCP tool schemas behind a find_tools search - #28225
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…the shared budget is touched
… exact-case scopes in find_tools
…w padded server scopes
…nstead of per name
…ent is enabled Removes the ContextLimit/10 deferral threshold, the estimated-token decision, the deferred_mcp_tool_tokens metric, and the --chat-mcp-tool-search-force-defer deployment flag. With the mcp-tool-search experiment enabled, every generation with deferrable MCP candidates now defers behind find_tools. Also pairs activation-derivation error results with their own tool call, so a provider reusing a tool-call ID cannot demote a later successful call.
A result now settles the newest unpaired call with its ID, so an older call whose result was lost cannot adopt a later call's error. Also folds the duplicated find_tools array parsers in Tool.tsx into one shared parseArray helper.
… under reused IDs
…argument decoding
…or and empty render states
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Summary
When the
mcp-tool-searchexperiment is enabled, chatd stops inlining connected MCP tool schemas into every generation. It instead exposes a built-infind_toolstool whose description carries a compact catalog of the deferred tools, and only ships full JSON schemas for tools the model has activated by searching or by calling them directly.Closes CODAGT-760.
Problem
Tool-heavy agent configurations (GitHub, Linear, Notion, and dev-tooling MCP servers) inline over 100k tokens of tool schema definitions into every generation. Initial uncached requests reached ~216k tokens with time-to-first-token close to nine minutes, while the model typically invokes only a handful of tools per turn.
How it works
decideMCPToolSearchdefers external and workspace.mcp.jsonMCP tools whenever the experiment is enabled. Native, dynamic, provider, skill, and transport tools are never deferred.find_toolsembeds a server-grouped catalog in its tool description (degrading to names-only, then counts-only, then a constant-size summary past a context-scaled size cap) and scores keyword matches across tool names, descriptions, parameter schemas, and server metadata. Queries can scope to one server with aserver:prefix, and exactnamesarguments always activate.find_toolsresults and direct calls to deferred tools), so activations naturally lapse when compaction summarizes them away. Aggregate activated schema weight is capped at 10% of the context window, shedding the least recently activated schemas first;find_toolsshares that budget across parallel calls in one step. No new persistence.find_toolsall disable deferral, leaving today's behavior byte-identical on the wire.find_toolscalls, matches, activations, and deferred token weight.find_toolscalls with a collapsed search summary and expandable match list, falling back to the generic renderer on malformed payloads.Validation