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perf(agents): an agent does as well with the short MCP answer schema - #341

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leemour merged 1 commit into
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perf/mcp-short-listing
Nov 9, 2026
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leemour merged 1 commit into
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perf/mcp-short-listing

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@leemour leemour commented Nov 9, 2026

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Task

Check that the short MCP answer schema in cli-core costs an agent nothing before it ships.

What

performance/agents/mcp-short-listing: the eval script, its 21 tasks, the two listings and the raw runs. Haiku 5.5 on memo's MCP server over a synthetic store, two runs per arm, exact scoring.

  • Success: 39/42 with the short listing (3,323 characters for the three tools), 39/42 with the full one (17,278).
  • Input tokens: 2.49 M against 5.29 M.
  • Spend: $0.83.

🤖 Generated with Claude Code

Haiku 5.5 over memo's MCP server on the synthetic v3 store, 21 tasks twice per arm, scored exactly: 39/42 with the
short listing (3,323 characters for the three tools) and 39/42 with the full one (17,278), on 2.49 M against 5.29 M
input tokens. The arms differ only in the outputSchema of memo_read and memo_write, shown in the tool description,
since the Messages API has no output-schema field. Spend $0.83.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@leemour
leemour merged commit 545a702 into main Nov 9, 2026
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