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Add Meta-Harness recipe with a full candidate store - #80
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Meta-Harness (arXiv 2603.28052) gives its proposer filesystem access to every prior candidate's code, scores, and execution traces. The new recipe reproduces that loop under the frozen evaluator: - rollout/meta_harness replays the selected parent like parent_evaluation and builds rollout/candidates/: an index of every candidate with its score, status, handoff, and diffs against its parent and the seed, plus a per-task frontier. Each certified candidate's evaluation is replayed once and later generations point back to it. - mutate/meta_harness carries the reference proposer's rules: one falsifiable mechanism per candidate, read traces across candidates, no task-specific hints, and a handoff note later proposers read. - The certified-replay helpers move from parent_evaluation into library/rollout/_support/certified_replay.py so both operators share the same digest-verified path; parent_evaluation behaviour is unchanged. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0146TTyeMc3Gx6mqsYeGG7vM
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly identifies the main change: adding the Meta-Harness recipe with a full candidate store. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Andyyesiyu
marked this pull request as ready for review
October 15, 2026 06:09
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Review comments at @library/rollout/meta_harness.py:
- Around line 204-207: Update the replay logic around the genid-in-prior branch
to reuse prior cases, summary, and per_task only when genid is certified and its
stored artifact digest matches the current row artifact digest. Store the digest
on entries created by both parent and fresh-replay paths so uncertified
candidates or candidates with changed artifacts are replayed anew.
- Around line 208-223: In the certified non-parent candidate branch that calls
replay_certified_cases, catch SystemExit, record its message in that candidate’s
index entry as replay_error, and continue processing other candidates. Keep
writing cases and appending to replayed only when replay succeeds; leave the
selected-parent replay strict.
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📒 Files selected for processing: 29
README.mdREADME.zh-CN.mddocs/QUICKSTART.mddocs/concepts/design.mddocs/reference/operators/mutate.mddocs/reference/operators/rollout.mdlibrary/README.mdlibrary/mutate/meta_harness.pylibrary/rollout/_support/__init__.pylibrary/rollout/_support/certified_replay.pylibrary/rollout/meta_harness.pylibrary/rollout/parent_evaluation.pyrecipes/README.mdrecipes/meta_harness/README.mdrecipes/meta_harness/evolve.yamlscripts/run_recipe_demo.shscripts/setup_terminal_bench.shtests/conftest.pytests/fixtures/normalized_recipe_operator_configs.jsontests/test_evaluation_replay_rollout.pytests/test_m0_init.pytests/test_meta_harness.pytests/test_phase_e_recipes.pytests/test_phase_f_init_binding.pytests/test_recipe_composition.pytests/test_recipe_full_cycle.pytests/test_recipe_inventory.pytests/test_release_artifact.pytests/test_runtime_recipe_conformance.py
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…d best score Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0146TTyeMc3Gx6mqsYeGG7vM
… the Meta-Harness store Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0146TTyeMc3Gx6mqsYeGG7vM
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Requested by ye siyu · project thread
Before: RSIHub had no Meta-Harness recipe, though recent harness-evolution papers (VERSE, SIFT and others) use Meta-Harness (arXiv 2603.28052) as their most common baseline. The mutation agent only saw the selected parent's traces, the last 8 attempts and the latest accepted diff.
After:
evolve init --recipe meta_harnessruns a Meta-Harness search on the same MiniSWE × Terminal-Bench 2.0 setup as the AHE and HyperAgents recipes. Each generation, the proposer gets a candidate store listing every prior candidate with its score, status, handoff note, diffs against its parent and the seed, and replayed certified traces, plus a per-task frontier.How:
library/rollout/meta_harness.pyreplays the selected parent exactly likeparent_evaluation, then writesrollout/candidates/{index.json,index.md,frontier.json}. Each certified candidate's evaluation is replayed once, in the first generation after it is certified; later generations point back to that replay rather than copying traces again. Uncertified candidates are listed with code and status only.library/mutate/meta_harness.pycarries the reference proposer's rules: one falsifiable mechanism per candidate, read failed and successful traces across candidates, no task-specific hints, and aHYPOTHESIS / CHANGES / PREDICTION / EVIDENCEhandoff that later proposers see in the index.parent_evaluation.pyintolibrary/rollout/_support/certified_replay.py, so both operators share one digest-verified path.parent_evaluationbehaviour is unchanged and its tests pass; one test now patches the helper module where_artifact_sourceslives.greedyselect,trace_browseranalyze, Codex gpt-5.4 xhigh proposer (same as the other recipes, for comparability),parent_eligiblegate,target/**surface. Differences from the reference implementation are listed inrecipes/meta_harness/README.md.Validation:
ruff check,ruff format --check,ty check: clean.test_agent_runner.py::test_run_mutate_timeout_kills_command_group, also fails on unmodifiedmainin this container.test_recipe_full_cycle.py[meta_harness]with--run-slow: passed. I also continued that offline workspace to 3 generations and confirmed the store indexes all candidates and replays a non-parent candidate once.test_release_artifact.pyagainst a freshuv build: passed.🤖 Generated with Claude Code
https://claude.ai/code/session_0146TTyeMc3Gx6mqsYeGG7vM
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