feat(nano): vision_analyze as a conditional seventh tool (PR 11) - #890
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…onfig) The TB 2.1 gap analysis attributed 4-5 of pi's exclusive wins to its TB extension's vision_analyze/websearch (16 vision calls across chess-best-move, video-processing, extract-moves-from-video, path-tracing; nano's text-only model tried PIL pixel-reading 12x on the chess board and failed). pi ships that tool precisely because text-only main models need eyes; clawcodex has the identically-named counterpart. Nano now registers vision_analyze IFF a vision model is explicitly configured (the tool's own is_enabled gate — global config vision.enabled, seeded by the adapter's --ak vision=provider:model). Unconfigured nano stays exactly six tools. Conditional REGISTRATION rather than registered-but-disabled is load-bearing: a disabled registered tool re-enters query()'s deferred-tools list and would resurrect the <available-deferred-tools> message-0 block, busting byte-stability. The prompt lists the tool only when registered (+178 est. tokens, only when configured). Tests: hermetic autouse vision-off fixture (the dev machine's real config had vision enabled — six-tool invariants must not depend on that), 7-tool + prompt-snippet cases under vision_configured. 61 pass. Runbook: matching jobs/tb21-pi-flash-max-2 requires --ak vision=openai:gpt-5.6-luna on the nano arm. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Gap analysis: 4–5 of pi's exclusive TB 2.1 wins used its extension's vision tool (16 calls; nano tried PIL pixel-reading 12× on chess-best-move). Nano now registers the identically-named
vision_analyzeIFF vision is explicitly configured (--ak vision=provider:modelseeds it) — pi's own TB-extension design. Unconfigured nano stays exactly six tools; conditional registration (not registered-disabled) keeps the deferred-tools block structurally absent. Hermetic vision fixtures + 2 new tests; 61 pass.🤖 Generated with Claude Code