fix(task): lead each request user message with its tool_result blocks by PierrunoYT · Pull Request #1839 · Zoo-Code-Org/Zoo-Code

PierrunoYT · 2026-09-28T18:03:55Z

Related GitHub Issue

Closes: #1774

Description

When read_file on an image runs alongside another tool call in the same turn, the next user message can be saved as [tool_result, image, tool_result, text]. Anthropic requires the results for the previous turn's tool_use blocks to lead the message, so the request fails with a 400. Because the broken message is already in api_conversation_history.json, every retry sends it again and the task stays stuck.

This PR repairs that history when it builds each request. It does not change stored history.

orderToolResultsFirst (src/core/task/orderToolResultsFirst.ts) moves each user message's tool_result blocks to the front. It keeps the order of the results and of the remaining blocks.
Images: An image that directly follows a tool_result moves into that result's content. This is the shape the issue asks for. A string content becomes a text block first. An image that has no result directly before it stays outside the results, after them.
Unchanged messages: A message that is already in order is returned as the same object. This includes a valid message that has an image after its last result.
Where it runs: in attemptApiRequest, right after mergeConsecutiveApiMessages, because merging consecutive user messages can interleave blocks too. It only shapes the request. Stored history is not modified, the same as the merge step.
Effect: a task already stuck with the broken shape recovers on its next retry, with no manual editing of api_conversation_history.json.
Other providers: The OpenAI-format conversion already splits tool_result blocks into separate tool messages. Nested images keep their meaning there.

This PR does not change how new user messages are built (Task.pushToolResultToUserContent). It repairs the saved shape when the request is built. It also covers new messages that have this shape.

Test Procedure

orderToolResultsFirst.spec.ts covers:
- the exact persisted [BUG] Image read_file combined with other tool calls produces Anthropic 400 error #1774 shape: the image moves into the read_file result, and the stored message is left unchanged;
- several interleaved images, each nested in its own result;
- an image added to a result whose content is already an array, without changing the original block;
- an image that has no result directly before it, which stays outside the results;
- interleaving created by mergeConsecutiveApiMessages;
- already-ordered, string, and assistant messages returned as the same object.
Task.spec.ts: a test goes through the real attemptApiRequest with the [BUG] Image read_file combined with other tool calls produces Anthropic 400 error #1774 history. It asserts the full request content: both results lead, the image is inside the read_file result, and the environment-details text follows. It also asserts that stored history keeps its shape. The test fails without the change to Task.ts.

cd src
npx vitest run core/task core/assistant-message

Results: 61 files / 1114 tests passed. Type checking and ESLint pass. ESLint suppression counts are unchanged.

Pre-Submission Checklist

Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
Scope: My changes are focused on the linked issue (one major feature/fix per PR).
Self-Review: I have performed a thorough self-review of my code.
Testing: New and/or updated tests have been added to cover my changes (if applicable).
Visual Snapshot (UI changes only): Not applicable; no UI changes.
Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Visual Snapshots

Not applicable; no UI changes.

Videos (interaction / animation only)

Not applicable.

Documentation Updates

No documentation updates are required.

Additional Notes

No live Anthropic request was made. The tests assert the request payload handed to createMessage.

🤖 Generated with Claude Code

coderabbitai · 2026-09-28T18:04:05Z

Summary

Summary by CodeRabbit

Bug Fixes
- Improved the ordering of tool results when conversation history is prepared for processing. Tool results now appear before other content in the same user message, while the stored conversation history retains its original order. Images and other content follow the tool results, preserving their relative order; models without image support receive a text placeholder instead. This helps mixed-content history be handled consistently.

Task now reorders tool-result blocks ahead of other content in merged user messages before passing API history to createMessage. This changes request history; stored conversation history retains its original block order.

Changes: Tool-result ordering

Layer / File(s)	Summary
Reorder interleaved tool results `src/core/task/orderToolResultsFirst.ts`, `src/core/task/__tests__/orderToolResultsFirst.spec.ts`	The helper moves tool-result blocks before other blocks in user messages with array content. Tests cover ordering, content preservation, unchanged messages, and provider request conversion.
Apply ordering to API history `src/core/task/Task.ts`, `src/core/task/__tests__/Task.spec.ts`, `src/core/task/__tests__/orderToolResultsFirst.spec.ts`	Task applies the helper after merging consecutive user messages. Tests check outgoing request order for models with and without image support and confirm that stored history retains its original order.

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant Task
  participant orderToolResultsFirst
  participant createMessage
  Task->>orderToolResultsFirst: Reorder merged user messages
  orderToolResultsFirst-->>Task: Return API history with tool results first
  Task->>createMessage: Pass reordered API history

Merge Risk: Minimal · up to 04da4

This change reorders tool results ahead of other content when building API requests, so conversations that were stuck on the ordering error can be resent. Stored history is unchanged. No remaining merge-blocking risk was identified.

Caution

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

Ignore (reviewers only)

Failed checks: 1 error

Check name	Status	Explanation	Resolution
Linked Issues check		[`#1774`] Requirements: (1) nest each image that follows a read_file tool_result inside that result's content array; (2) make all tool_result blocks contiguous at the start of the user message, followed…	In src/core/task/orderToolResultsFirst.ts, nest each image that directly follows a tool_result into that result's content. Convert a string content to a text block first, and keep the images that have no preceding result as top-level blocks…

Passed checks: 7 passed

Check name	Status	Explanation
Title check		The title "fix(task): lead each request user message with its tool_result blocks" matches the main change. The PR reorders tool_result blocks to the front of each user message when building API reques…
Description check		The description follows the template well. It links issue `#1774` with 'Closes: `#1774`', gives a clear description of the how (orderToolResultsFirst, image nesting, placement after mergeConsecutiveApiMes…
Out of Scope Changes check		The changes at head add the helper module orderToolResultsFirst.ts, one import and call in Task.ts attemptApiRequest, and tests (orderToolResultsFirst.spec.ts, a Task.spec.ts regression test). The cha…
Regression Evidence		The changed behavior is the new `orderToolResultsFirst` helper and its call in `Task.attemptApiRequest`, after `mergeConsecutiveApiMessages`. Coverage exists at the lowest valid layer and at the integ…
Security Boundaries		The security boundaries check fails only for a changed path that leaks secrets or PII, trusts or executes unvalidated input, or bypasses approval or allowlist controls. The diff (verified with `git di…
Persistence Integrity		The check fails only for a changed persistence path that can lose or corrupt state through an unawaited operation, a non-atomic write, missing rollback or partial-failure handling, or a persisted defa…
Lifecycle Resource Cleanup		The check fails only when a changed lifecycle path can leak a listener, watcher, provider, timer, task, or other resource, or can duplicate work after cancellation, disposal, or restart. The PR diff (…

Full details: Title check

Explanation

The title "fix(task): lead each request user message with its tool_result blocks" matches the main change. The PR reorders tool_result blocks to the front of each user message when building API requests in attemptApiRequest, which the changeset implements via orderToolResultsFirst. The title is specific and short, and it names the affected area (task).

Full details: Description check

Explanation

The description follows the template well. It links issue #1774 with 'Closes: #1774', gives a clear description of the how (orderToolResultsFirst, image nesting, placement after mergeConsecutiveApiMessages, unchanged messages, and no change to stored history), and lists test procedure with commands and results. The checklist is completed. Minor gaps: the Discord username field under 'Get in Touch' is absent, and the Description section does not say much about trade-offs for reviewers beyond the image-placement behavior. These gaps do not reduce overall completeness.

Full details: Out of Scope Changes check

Explanation

The changes at head add the helper module orderToolResultsFirst.ts, one import and call in Task.ts attemptApiRequest, and tests (orderToolResultsFirst.spec.ts, a Task.spec.ts regression test). The change summary also lists provider-converter tests for OpenAI chat, AI SDK, and OpenAI Codex Responses. These verify that the repaired shape reaches each converter, which supports the #1774 fix. The Task.ts edit is limited to the request-building path and does not change stored history. I found no unrelated refactor in the reported change set. The scope is consistent with #1774. The image placement defect is a requirement gap, assessed under linkedIssuesAssessment, not a scope violation.

Full details: Regression Evidence

Explanation

The changed behavior is the new orderToolResultsFirst helper and its call in Task.attemptApiRequest, after mergeConsecutiveApiMessages. Coverage exists at the lowest valid layer and at the integration layer. Unit tests (src/core/task/__tests__/orderToolResultsFirst.spec.ts) cover: - The persisted #1774 shape: [tool_result, image, tool_result, text]. - Several interleaved images. - Leading and mid-message blocks moved after the results, in original order. - Interleaving created by mergeConsecutiveApiMessages. - Negative branches: already-ordered, string-content, result-free, and assistant messages, all returned by reference. - Stored content left unchanged. Provider-conversion tests in the same file cover the repaired image reaching the OpenAI chat, AI SDK, and OpenAI Codex requests. They also cover image removal for a model without image support. Integration test (src/core/task/__tests__/Task.spec.ts, new it.each) runs through attemptApiRequest with the #1774 history. It runs with supportsImages: true and false. It asserts the full outgoing user content and that stored history keeps its original shape. The helper has no error path. Its branches are all exercised. Observation outside this check: the PR description says an image that directly follows a tool_result is nested into that result's content. The head implementation and its tests do not nest images. They keep images as top-level blocks after the results. This is a documentation and requirements mismatch, not a missing-coverage failure. It is noted here and not scored under this criterion.

Full details: Security Boundaries

Explanation

The security boundaries check fails only for a changed path that leaks secrets or PII, trusts or executes unvalidated input, or bypasses approval or allowlist controls. The diff (verified with git diff against the review base) has four files: Task.ts (+6/-1), a new orderToolResultsFirst.ts, and two spec files. - Changed path: attemptApiRequest in Task.ts now wraps mergeConsecutiveApiMessages output in orderToolResultsFirst. The new helper only reorders tool_result and other content blocks in user messages that already exist in history. It adds no network call, logging, persistence, or new data source. - Secrets or PII: No new data is read, logged, or sent. The request contains the same blocks as before, in a different order. - Unvalidated input: The helper does not execute or interpret content. It reorders typed blocks and returns them as request data. - Approval or allowlist: No approval, auto-approve, tool-permission, or allowlist code is touched. The CodeRabbit threads raise correctness issues, not security ones. These are: nested images bypassing maybeRemoveImageBlocks ordering, dropped images in the OpenAI-Codex, OpenAI-format, and AI SDK converters, and a missing image-capable test. These are functional regressions that the check does not list as failure conditions. The check therefore does not match them. Result: no changed path matches an explicit security-boundary failure condition.

Full details: Persistence Integrity

Explanation

The check fails only for a changed persistence path that can lose or corrupt state through an unawaited operation, a non-atomic write, missing rollback or partial-failure handling, or a persisted default not reaching a consumer. The PR does not add such a path. Evidence from the diff (refs/coderabbit/pre-merge-check/base..head): - The only change to Task.ts wraps the request-time history in orderToolResultsFirst(...). It sits in attemptApiRequest around mergeConsecutiveApiMessages (Task.ts ~5879-5890). The result feeds messagesWithoutImages and buildCleanConversationHistory, which build the outgoing request only. - orderToolResultsFirst (src/core/task/orderToolResultsFirst.ts:17-33) is pure. It maps over messages and returns the same object when already ordered. Otherwise it returns a new object with new content arrays. It does not mutate its input and does not call any save or write API. - Stored history is unaffected. apiConversationHistory is written only by the existing save paths (saveApiConversationHistory, Task.ts ~1611). The PR adds no write, no save call, and no change to those paths. The PR description states that stored history is not modified. - The PR adds no new async operation, file write, or default value. No unawaited call or non-atomic write is introduced. The review threads raise request-shaping concerns for OpenAI-format, AI SDK, Codex, and Copilot image handling. Those concern request content and provider conversion, not persistence integrity, so they fall outside this check's criteria.

Full details: Lifecycle Resource Cleanup

Explanation

The check fails only when a changed lifecycle path can leak a listener, watcher, provider, timer, task, or other resource, or can duplicate work after cancellation, disposal, or restart. The PR diff (refs/coderabbit/pre-merge-check/base..head) changes four files: - src/core/task/orderToolResultsFirst.ts (new): a pure, synchronous function. It maps over ApiMessage[] and returns a new array. It creates no listeners, timers, watchers, providers, or tasks, and it holds no state. - src/core/task/Task.ts: adds one import and wraps the existing mergeConsecutiveApiMessages(...) call in orderToolResultsFirst(...) inside attemptApiRequest. The call runs once per request build. It adds no awaits, no event subscriptions, and no new retry loop. Cancellation and disposal paths are not touched. - src/core/task/__tests__/Task.spec.ts and orderToolResultsFirst.spec.ts: tests only. The changed path only reshapes an in-memory message array before the existing request code runs. Nothing it creates needs cleanup. The change does not alter how a retry or restart reissues work beyond the existing per-request behavior. No concrete leak or duplicated-work scenario follows from the changed code. Review threads (provided as context) concern provider image conversion and mutation-test advisories. They are not lifecycle issues.

Full details: Linked Issues check

Explanation

[#1774] Requirements: (1) nest each image that follows a read_file tool_result inside that result's content array; (2) make all tool_result blocks contiguous at the start of the user message, followed by other blocks; (3) repair stored-shape history before resend so retries do not replay the invalid shape.

Evidence at head: src/core/task/orderToolResultsFirst.ts moves all tool_result blocks ahead of the remaining blocks and keeps the order within each group. This meets requirement (2). Task.ts applies it after mergeConsecutiveApiMessages in attemptApiRequest, and stored history is not modified. This meets requirement (3) at request time.

Requirement (1) is not met. The head implementation does not nest images. Its doc comment states that images stay top-level blocks after the results. The function returns [...results, ...rest], so an image is a sibling of the tool_result, not an entry in its content. The issue's expected behavior explicitly requires nesting per the Anthropic Messages API shape. The PR description also claims nesting, which the code at head contradicts. The Task.spec.ts change summary describes the image as following the results, which matches top-level placement. I could not read the whole-PR diff (changed blobs unavailable), so this finding rests on the head source file read directly.

The previous PASS relied on an earlier version that nested images. That conclusion no longer holds for the current head.

Resolution

In src/core/task/orderToolResultsFirst.ts, nest each image that directly follows a tool_result into that result's content. Convert a string content to a text block first, and keep the images that have no preceding result as top-level blocks after the results. Update the doc comment, the orderToolResultsFirst.spec.ts expectations, and the Task.spec.ts #1774 regression assertion so each asserts the image inside the read_file tool_result. Keep the PR description consistent with the resulting behavior.

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github-actions · 2026-09-28T18:04:07Z

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Current step: Address automated review findings and push fixes.

After fixes are pushed and required CI passes, automated review restarts.

Review-state labels are managed by this workflow; do not edit them manually. community-approved is managed the same way — do not add or remove it manually. It signals a fresh community code approval for the current head as an advisory priority only; maintainer review is still required.

codecov · 2026-09-28T18:09:07Z

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✅ All modified and coverable lines are covered by tests.

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/core/task/__tests__/Task.spec.ts:
- Around line 2988-2992: Update the test assertions around lastUserContent to
verify the complete outgoing user content, not just the leading tool_result
blocks: use an image-capable mock handler and assert that the image and trailing
environment-details text follow both results.

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src/core/task/Task.ts
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src/core/task/__tests__/orderToolResultsFirst.spec.ts
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