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Routing: SessionStart hook lifts Haiku on bare questions 66% to 92%; held-out sets 3 and 4 - #7

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Oct 31, 2026
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@khanhphamj khanhphamj commented Oct 31, 2026 •

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Two description rewordings did not help Haiku 5.5 on bare questions (75% to 76%) and were reverted. What worked: a SessionStart hook (Claude Code only) that says "my agent" means a GreenNode AgentBase agent unless another framework or platform is named.

Haiku 5.5, 2 runs per case: fresh held-out4 66% to 92%, held-out2 64% to 95%, tuning 95% to 100%; all 8 other-stack cases stayed none. Sonnet 5.5 on held-out4: 98%, one false positive (CrewAI) that the final wording targets.

Not verified: the final wording (after the CrewAI fix) has no score, the Claude Code weekly limit was reached. Rerun held-out4 on Sonnet and Haiku and the tuning set on Sonnet after it resets (Nov 2).

🤖 Generated with Claude Code

khanhphamj and others added 2 commits October 31, 2026 10:16
… routing

Two description rewordings (assume-AgentBase sentence, general-question clause) were measured on a fresh 36-case set and
did not move Haiku 5.5 (75% -> 76%), so descriptions are unchanged; the finding and the new set are documented.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
… held-out set 4

Haiku 5.5 on bare questions 66% -> 92% (fresh set), 64% -> 95% (held-out2), tuning 95% -> 100%. The last wording tweak
(skip agents on another named stack) is not re-measured: weekly limit reached.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
@khanhphamj khanhphamj changed the title Routing: held-out set 3 and a recorded negative result for Haiku Routing: SessionStart hook lifts Haiku on bare questions 66% to 92%; held-out sets 3 and 4 Oct 31, 2026
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khanhphamj merged commit b45cd08 into main Oct 31, 2026
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khanhphamj deleted the feat/haiku-bare-questions branch October 31, 2026 03:59
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