Report how every search ended, not only the curtailed ones - #61
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A search with no witnesses means two different things. If the token bound was exhausted, every sentence that short has been checked and none is ambiguous. If a limit stopped the run, it only means the search quit before finding something. The report distinguished them by saying nothing in the first case and naming a reason in the second, so the conclusive outcome was the one you had to identify by the missing explanation -- and the reader had to know that convention to read the report at all. Both cases now print one line with the depth reached and the reason, exhaustion included. The witness branch prints it too: whether the families listed are all of them turns on exactly the same distinction. tools/syntax_experiment.py parses these lines, and `stopped` means "ended early" to the rest of that tool -- uncertain_clean and the summary's stop column both read it that way. It now recognises the exhaustion reason and maps it back to None, so a completed bound keeps counting as complete rather than every run suddenly looking curtailed. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N4KejxPN4Q9uQ67dHwUDgj
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📝 WalkthroughWalkthroughThe ambiguity search now reports why each run ended. Parsers distinguish token-bound exhaustion from curtailed searches. Tests cover exhaustion, timeout, and witness-producing searches. Documentation defines the resulting coverage semantics. ChangesSearch termination reporting
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The change makes search outcomes explicit, but current edge cases can still mislabel a completed search as curtailed or treat malformed output as a clean result, leading to incorrect ambiguity conclusions and variant rankings. These bounded correctness issues should be fixed or explicitly accepted before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@tools/ambiguity_search.ml`:
- Around line 2144-2159: Update the post-loop timeout handling in unified_search
so it assigns the timeout reason only when queued work remains after processing
the final frontier; preserve witness-limit and memory-limit reasons with their
existing precedence. Ensure outcome.stopped remains None for a fully drained
search, allowing the reporting logic around outcome.witnesses and termination to
classify token-bound exhaustion as conclusive.
In `@tools/syntax_experiment.py`:
- Around line 837-846: Update the SearchResult construction in the surrounding
search function to require both DEPTH_RE and STOPPED_RE matches before returning
a successful result; when either match is absent, return a SearchResult carrying
an error instead of None for the missing value. Preserve the existing
COMPLETED_REASON normalization for valid termination records.
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docs/ambiguity.mdtools/ambiguity_search.mltools/syntax_experiment.pytools/test_prover.py
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Two review findings, both about the same contract. The post-loop check in unified_search read the clock alone, but the loop also exits with a drained queue -- and expanding the last frontier can carry the clock past the deadline on the way out. A search that covered its whole token bound was then recorded as timed out. That was always wrong; it matters now because the report no longer says merely "no ambiguity found" but claims the bound was exhausted, so the misclassification contradicts a specific claim and turns the one conclusive outcome into a curtailed one. The deadline is the reason only when work is still queued. A dropped frontier keeps its own reason whatever the clock says, since the bound was not covered either way. syntax_experiment.py mapped a missing termination line to "no reason", which metric() reads as a confidently clean result -- the single conclusion that output cannot support. Stale reports and runs that died before printing would have been scored as complete bounds. It now fails closed with an error. The parsing moved into parse_search_output so the contract can be exercised without a built engine: an exhausted bound is not recorded as stopped, a curtailed one keeps its reason, and a missing line is an error. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N4KejxPN4Q9uQ67dHwUDgj
The previous commit checked the timeout before the dropped-frontier case while its own comment claimed the opposite, so a run that both dropped frontiers and passed its deadline was reported as a timeout. Either order keeps the property the reporting depends on -- `stopped` is set whenever the bound was not covered, so exhaustion is never claimed falsely -- but they are not equally useful. A timeout says more time would have finished the bound. A dropped frontier says the memory budget could not hold it, and no amount of time changes that. When both are true the second is what the reader needs, so it goes first and the comment now describes the code. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N4KejxPN4Q9uQ67dHwUDgj
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A search that finds no witnesses means one of two very different things, and the report distinguished them by staying silent about the important one.
If the token bound was exhausted, every sentence that short has been checked and none is ambiguous. If a limit stopped the run, it only means the search quit before finding anything. The first case printed:
and the second added a reason and a depth. So the conclusive outcome was the one you identified by the missing explanation — and you had to already know that convention to read the report at all.
This came up on a real run. Dispatching
generalat0..8againstmainto test whether the level-3 abstract candidateAMPERSAND UIDENT LBRACKET RBRACKET SEMICOLON EOFwas spurious, the output above is what came back. It settles the question — 5 real tokens, bound of 8, exhausted — but only if you notice a sentence that is not there.The change
Both branches now print one line carrying the depth reached and the reason, exhaustion included:
The witness branch prints it too. Whether the families listed are all of them turns on exactly the same distinction, and it was previously reported there only when a limit had intervened.
The parser that depended on the old silence
tools/syntax_experiment.pyreads these lines, andstoppedmeans "ended early" to the rest of that tool —uncertain_cleancounts a clean run as uncertain whenstopped is not None, and the summary table falls back to"bound completed"when it isNone. Making the reason always present would have flipped every completed bound to uncertain and quietly changed how variants rank.It now recognises the exhaustion reason and maps it back to
None, sostoppedkeeps meaning "a limit intervened" rather than "the engine bothered to explain itself". The reason string is a named constant on that side of the boundary.Tests
SearchTerminationTestsintools/test_prover.pycovers the three cases from the outside:Verification
This session has no OCaml toolchain — devbox installs nixpkgs from
api.github.com, which the sandbox egress policy blocks — so the OCaml is compiled for the first time by this PR's CI rather than locally. Checked locally: both Python modules compile, and the prover suite collects 14 tests.🤖 Generated with Claude Code
https://claude.ai/code/session_01N4KejxPN4Q9uQ67dHwUDgj
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Summary by CodeRabbit
New Features
Documentation
Bug Fixes