fix-forward #2593: _cap_context_snapshot adds _truncated/_dropped after deciding the payload fits, so a many-small-fields snapshot returns OVER the cap with zero fields preserved - #2777
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…slicing serialization _cap_context_snapshot() previously sliced the JSON-encoded snapshot to the byte limit and reparsed the slice, which is almost never valid JSON, so every oversized snapshot collapsed to a bare _truncated marker with zero fields preserved. The fix drops fields largest-first until the serialized form fits, preserving valid JSON and smaller keys such as agent_id, and records dropped fields in a _dropped list. Tests now assert required keys survive and the result is valid JSON, not just size. Docs updated to describe the new behavior.
_account for _truncated/_dropped overhead in the capping loop instead of adding them afterwards, and replace the unbounded _dropped list with a bounded count so the recovery loop makes net progress on many-small-fields snapshots. - reserve marker_overhead in the first loop so the final serialized form fits within _MAX_CONTEXT_SNAPSHOT_BYTES by construction - change _dropped from a list of key names to an integer count, preventing it from consuming the budget it reports on - change the recovery loop guard from len(snapshot_copy) > 1 to > 2 so it stops when only the markers remain - add two regression tests for the many-small-fields shape that previously returned over the cap with zero real fields preserved Tests pass: uv run pytest tests/test_restart_orchestrator_resume.py -k CapContextSnapshot -q 7 passed, 7 deselected
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📝 WalkthroughWalkthroughThe restart orchestrator now limits resume ChangesResume context snapshot cap
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to Resume snapshots are now bounded before initial and retry requests, but snapshots containing reserved marker keys can lose data without accurate drop reporting, and one release note inaccurately describes the truncation behavior. These bounded issues should be corrected before release. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 7.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 2 files. (4 skipped: 4 unsupported.)
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Inline comments:
In `@changelog.d/tsk-kkxn6f-resume-context-snapshot-cap.md`:
- Line 3: Update the release note to describe _cap_context_snapshot() removing
complete top-level context_snapshot fields to enforce the size cap, rather than
claiming it retains a 32768-byte suffix; retain the _truncated marker and
overflow-prevention behavior.
In `@tinyagentos/restart_orchestrator.py`:
- Around line 296-297: Update the oversized-snapshot handling before
constructing fields so existing _truncated and _dropped data keys are either
removed and included in dropped_count or explicitly rejected, preventing marker
assignments from silently overwriting user data; preserve accurate dropped-count
reporting and add a regression test covering both reserved keys.
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changelog.d/tsk-ekc4ct-fix-context-snapshot-cap.mdchangelog.d/tsk-kkxn6f-resume-context-snapshot-cap.mdchangelog.d/tsk-nfivhi-cap-context-snapshot-marker-overhead.mddocs/agent-coordination.mdtests/test_restart_orchestrator_resume.pytinyagentos/restart_orchestrator.py
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Code Review SummaryStatus: 3 Issues Found | Recommendation: Address before merge Overview
Issue Details (click to expand)WARNING
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Fix these issues in Kilo Cloud Reviewed by minimax-m3:free · Input: 72.6K · Output: 20.5K · Cached: 243.2K |
Conflicts in tinyagentos/restart_orchestrator.py (_cap_non_object_snapshot + _build_truncated_marker), docs/agent-coordination.md, and the tsk-ekc4ct changelog fragment: this branch's own fix-forward (reserve marker_overhead in the drop loop, switch _dropped to a bounded count, tighten the safety-net loop guard) and dev's independently-landed fix (tsk-kkxn6f: byte-precise _build_truncated_marker with a held-back reserve, required-field protection, and non-object snapshot handling) attack the exact same defect in the same function. dev's fix fully subsumes this branch's intent with a more complete implementation, so it was kept; this branch's own inline rewrite of _cap_non_object_snapshot was dropped in its favor. This branch's two added regression tests (many-long-keys / many-short-keys snapshots staying under the byte cap) are additive and were kept, along with a shadowed duplicate test this branch's own history had left in tests/test_restart_orchestrator_resume.py (a same-named test asserting the old bool+_dropped-count marker contract, already dead code under Python's name shadowing and incompatible with the adopted implementation) removed. Docs-Reviewed: merge only, no installer/route change
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Fold pass 2026-09-06 Merged origin/dev into this branch (407 commits behind). Real conflict: this PR's own fix-forward for the "_truncated/_dropped added after deciding the payload fits" defect in _cap_context_snapshot() and origin/dev's independently-landed fix for the exact same defect (tsk-kkxn6f, already merged separately) both rewrote _cap_non_object_snapshot / the truncation-marker logic. dev's version is a strictly more complete fix -- byte-precise budget via _build_truncated_marker(), required-field protection, and handling for non-object snapshots that neither branch handled before -- so it was kept in place of this PR's own inline rewrite. This PR's two added regression tests (many-long-keys / many-short-keys snapshots staying under the byte cap) are genuinely additive and were kept. A shadowed duplicate test left over from the merge (a same-named test_oversized_snapshot_keeps_required_fields asserting the old bool+int Ran tests/test_restart_orchestrator.py + tests/test_restart_orchestrator_resume.py: 59 passed. Findings: all 5 undisposed threads (4 kilo-code-bot, 1 coderabbitai) were about the specific inline implementation this fold pass replaced with dev's version, or (for the changelog wording finding) a changelog line whose current text already says what the finding asked for. All marked outdated by GitHub already; resolved with a reply pointing at what replaced the code, per thread. New head: 8c76a7d |
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Regression pins for _cap_context_snapshot marker overhead (fix landed on dev via tsk-kkxn6f)
What
This branch (tsk-nfivhi, a fix-forward from #2593 via tsk-ekc4ct's own
_cap_context_snapshotfix) is now tests-only: the fold pass on 2026-09-06 replaced this branch's own inline marker-overhead fix with origin/dev's independently-landed, more complete implementation (_build_truncated_marker, byte-precise budgeting, required-field protection), keeping only this branch's two regression pins and its changelog line.tests/test_restart_orchestrator_resume.py::TestCapContextSnapshot::test_many_long_keys_small_values_stays_under_limit-- 600 fields with long (57-char) keys and short values; asserts the capped snapshot still fits within_MAX_CONTEXT_SNAPSHOT_BYTESafter_cap_context_snapshot()runs.tests/test_restart_orchestrator_resume.py::TestCapContextSnapshot::test_many_short_keys_small_values_stays_under_limit-- 4000 fields with short keys and tiny values; same invariant, opposite shape (field-count-heavy rather than key-length-heavy).changelog.d/tsk-nfivhi-cap-context-snapshot-marker-overhead.md-- updated to describe the tests added here rather than the code fix, since the code fix was superseded.RED
Command:
python -m pytest tests/test_restart_orchestrator_resume.py -q -k 'many_long_keys or many_short_keys'Note: the dev commit that introduced
_build_truncated_marker(26bd892ff) and its follow-up (ce401063f) both already pass these two pins on their own parent commits -- the older two-pass drop loop that predates_build_truncated_markerhappens to already satisfy the weak "stays under the byte cap" check these pins make, just imprecisely (chopping one field at a time until it fits, rather than budgeting the marker up front). The real pre-fix baseline for these specific pins is this branch's own history: the commit immediately before this branch's own fix.Parent sha:
aaba682f7c7164e118ef502df6d2dbc65d9c80f1(fix(restart): drop largest fields to cap context_snapshot instead of slicing serialization)Note:
aaba682f7is this branch's own first-cut implementation and was never on dev. On dev's lineage both pins pass at every commit, including before tsk-kkxn6f's_build_truncated_markerlanded (checked at9cd33e20dandefeaf61c1), because the two-pass drop loop already keeps under the cap. The pins therefore guard dev's current drop-fields loop against the marker-budget overflow class that the first-cut implementation exhibited; they do not indicate dev was ever broken.Failed line:
GREEN
Command:
python -m pytest tests/test_restart_orchestrator_resume.py -q -k 'many_long_keys or many_short_keys'Head sha:
8c76a7dec052ab03323c7d3925a980896f91e8f5Passed line: