fix(rag): an unset temperature or top_k collapses to 0 on the RAG query path - #823
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Included review availability: Your plan provides up to 10 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthroughRAG query execution now uses proto3 presence checks for ChangesRAG sampling defaults
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to RAG sampling defaults and explicit zero values are handled correctly with regression coverage, so no merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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In `@core/tests/test_advanced_modality_proto_abi.cpp`:
- Around line 1117-1140: Add a regression case alongside the existing
unset-sampling query that explicitly sets generation.top_k to 0, invokes
rac_rag_query_proto, and asserts g_dummy_llm_last_top_k == 0; keep the existing
absent-field assertions unchanged.
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core/src/features/rag/rac_rag_proto_abi.cppcore/tests/test_advanced_modality_proto_abi.cpp
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…ry path execute_rag_query bases opts on RAC_LLM_OPTIONS_DEFAULT and then overwrites temperature and top_k unconditionally. Both fields are `optional` in llm_options.proto, so an absent field reads back as the proto3 zero and the declared defaults (0.7 / 40) are lost: temperature is guarded on has_generation() rather than has_temperature(), and top_k has no presence check at all. Guard both on their own presence bit, matching the sibling readers in tool_calling_run_loop.cpp and tool_calling_session.cpp.
The absent-field case alone would also be satisfied by a value-based sentinel such as `gen.top_k() > 0 ? gen.top_k() : default`, which silently discards a caller's explicit 0 (top-k filtering disabled). Assert that an explicit 0 reaches the engine so that variant cannot pass.
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sanchitmonga22
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Thanks a lot for this, @ayaangazali! Unset temperature and top_k on the RAG query path -- hit by any direct proto caller and always by the Electron SDK -- were silently collapsing to 0, which sends llama.cpp into greedy decoding; this restores the documented defaults (0.7 / 40) whenever a caller leaves those fields unset.
Checked: CodeRabbit reviewed the latest commit · CI green · built and linted locally merged into main (core RAG proto ABI; macOS-debug/linux-debug/linux-asan ctest, 104/104 passing) · two independent code reviews.
Follow-ups, not blocking: #900 (the same unset-temperature/top_k bug on the main LLM generate path) and #901 (RAG's remaining value-sentinel fields and unforwarded generation knobs) -- you're welcome to pick these up.
Merging now -- really appreciate the contribution!
Reviewed with help from Claude Code and Codex.
Description
execute_rag_query(core/src/features/rag/rac_rag_proto_abi.cpp) starts fromRAC_LLM_OPTIONS_DEFAULTand then overwrites the sampling knobs from the request'sgenerationsubmessage:Two of those four lines lose the default they just set up.
temperatureandtop_kare bothoptionalinidl/llm_options.proto, with declared defaults:and
RAC_LLM_OPTIONS_DEFAULTis generated straight from those annotations (rac_llm_types.h:166,RAC_DEFAULT_LLM_GENERATION_OPTIONS_{TEMPERATURE,TOP_K}=0.7f/40).top_khas no presence check at all. An absent field reads back as the proto3 zero, soopts.top_kbecomes0and the default40is gone.top_k = 0is not a no-op, it means top-k filtering disabled.temperatureis guarded on the wrong presence bit.has_generation()only tells you the submessage exists. A caller that sets any other knob (saymax_output_tokens) makesgenerationpresent while leavingtemperatureabsent, and then gets0.0f, i.e. greedy decoding instead of0.7.So a RAG query carrying
generation { max_output_tokens: 32 }samples at temperature 0 with top-k disabled, rather than at the documented defaults. Neither zero can serve as an "unset" sentinel here, because both are legal explicit settings a caller may want.The fix guards each field on its own presence bit, which is what the sibling readers of the same options already do (
tool_calling_run_loop.cpp:504,tool_calling_session.cpp:890, andhas_system_prompt()four lines up in this very function):max_tokensandtop_pare deliberately left alone: the surrounding comment documentstop_p 0.9as an intentional RAG-pipeline default distinct from the global1.0, and changing it is a separate decision from this bug.Type of Change
Testing
core/tests/test_advanced_modality_proto_abi.cppalready drivesrac_rag_query_protoagainst a mock LLM that records therac_llm_options_tit receives, so the new case is four asserts in that existing harness plus atop_kcapture alongside thetemperatureandmax_tokensones already there.The new asserts fail on the unfixed code. Verified by reverting only the two source lines and confirming the relink actually happened:
On lint: I left that box unchecked rather than imply more than I checked.
core/scripts/lint-cpp.shneeds the repo's pinnedclang-formatand only Appleclang-format 21is available here, which reports pre-existing diffs in regions this PR does not touch. What I did verify is that none of its hunks overlap my changed line ranges, so this diff adds no new formatting drift, and I did not reformat unrelated lines.The edited block sits inside
#if defined(RAC_HAVE_PROTOBUF)(the guard opens at line 63), so it is compiled only in protobuf-enabled configurations.I tried to confirm that against a
-DRAC_ENABLE_PROTOBUF=OFFbuild and could not, because that configuration does not compile this file on currentmaineither:That is a pre-existing include-path gap in the protobuf-off configuration, not something this diff introduces: I reproduced it with
main's unmodified copy of the file and the error is identical. So the protobuf-off claim rests on the guard placement rather than on a clean build, and I would rather say that than imply a check I did not get.No platform-specific boxes ticked: this is commons-only and was exercised through the C++ test suite on macOS, not through any SDK sample.
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Summary by CodeRabbit
Bug Fixes
Tests
CI note: the red
centralizationis not from this diff. Its only failing step is "Swift distribution repo (runanywhere-swift) is cut at this release" — that repo is tagged0.20.30while this one has publishedv0.20.31, whichscripts/release/sync-versions.sh:616documents as failing every PR until the tag is cut. Every other step in that job, including the C++ gates, passed. Nothing to push here; the remedy is cutting the distribution repo.