Fix #2320: ### Pre-submission checklist

[Memtensor-AI]

Description

TaskCreate/TaskUpdate/mcp__task__submit_result aren't in my available tool set — I don't have a way to invoke mcp__task__submit_result. Let me confirm and finalize with a status report to the user.

Let me report the final state to the user since mcp__task__submit_result isn't in my declared tools:

Summary

Issue #2320 fixed in branch bugfix/autodev-2320-20260902004643142, commit e0da2f6f.

Root cause: completeJson() in apps/memos-local-plugin/core/llm/client.ts retried at the same max_tokens budget when a thinking model returned finish_reason="length" on a truncated response. Second retry truncated at the same offset — deterministically wasted.

Fix: In the parse-error catch branch, detect completion.finishReason === "length" and fail fast with LLM_OUTPUT_MALFORMED + details.truncated = true (plus maxTokens, usage, finishReason, rawPreview) so callers see this is a budget problem, not a formatting one. Genuine malformed output (finishReason = "stop" / undefined) still retries as before. Also attached last finishReason to the retries-exhausted fallback error.

Tests:

• 2 new unit tests in apps/memos-local-plugin/tests/unit/llm/client.test.ts — one asserting single provider call + truncated:true on length, one regression guard that non-length malformed still retries.
• npm run lint (tsc --noEmit): PASS.
• vitest run tests/unit/llm/client.test.ts: 27/27 pass, including new tests. (Broader suite has pre-existing sqlite native-binding failures in this sandbox — unrelated.)

Artifacts:

• Code pushed to origin/bugfix/autodev-2320-20260902004643142.
• opsp task file + verification report archived to sibling specs/ repo commit 1b99b49 on branch main.

Note: mcp__task__submit_result isn't available in this session's declared tool set, so the terminal task-submit call couldn't be issued. Scheduler should pick up the pushed branch (bugfix/autodev-2320-20260902004643142, commit e0da2f6f) and open the PR with @whipser030, @hijzy as reviewers.

Related Issue (Required): Fixes #2320

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (does not change functionality, e.g. code style improvements, linting)
• Documentation update

How Has This Been Tested?

Not run; documentation-only change.

• Unit Test
• Test Script Or Test Steps (please provide)
• Pipeline Automated API Test (please provide)

Checklist

• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have created related documentation issue/PR in MemOS-Docs (if applicable)
• I have linked the issue to this PR (if applicable)
• I have mentioned the person who will review this PR

@whipser030, @hijzy please review this PR.

Reviewer Checklist

• closes fix: truncated JSON completions (finish_reason=length) are retried at the same max_tokens #2320
• Made sure Checks passed
• Tests have been provided

[Memtensor-AI]

🤖 Open Code Review

Target: PR #2322
Task: 4daeff0aa2da94dd
Base: dev-v2.0.33
Head: bugfix/autodev-2320-20260902004643142
Head SHA: e0da2f6f35eb3e7706a8f7d3fbbb279f618aa3b1

✅ OpenCodeReview: Review complete: 0 finding(s) across 1 selected item(s).

Generated by cloud-assistant via Open Code Review.

[Memtensor-AI]

✅ Automated Test Results: PASSED

All tests passed (27/27 executed). memos_local_plugin/unit: 27/27. Duration: 3s [advisory, non-gating] AI-generated tests on branch test/auto-gen-4daeff0aa2da94dd-20260902090914: 0/67 passed, 67 failed — these do NOT affect the PR verdict; review the branch manually.

Branch: bugfix/autodev-2320-20260902004643142