fix(anthropic): keep tool_result blocks contiguous by grouping image blocks separately by myk1yt · Pull Request #1705 · Zoo-Code-Org/Zoo-Code

myk1yt · 2026-09-19T23:43:47Z

Related GitHub Issue

Closes: #1307

Description

When a turn executes multiple tool_use blocks and at least one tool returns images, userMessageContent ended up as tool_result, image, tool_result, image. Anthropic rejects that user message with a hard 400 (tool_use ids were found without tool_result blocks immediately after) because tool_result blocks must be the first, contiguous content of the user message. Both consumers (Task.flushPendingToolResultsToHistory and the main request assembly) passed the array through verbatim.

Fix at the single choke point every tool_result push flows through (Task.pushToolResultToUserContent, covering all 8 call sites: the main tool-result callback, MCP-native dispatch, rejection/validation-error paths, and the task-interruption pre-injection path): after appending a new tool_result, any image blocks already in userMessageContent are relocated after it. Result shape: [trA, trB, imgA, imgB, text] — Anthropic accepts non-tool_result content after the contiguous result run, so this is spec-compliant and matches the issue's expected shape.

Why not at the image-push sites (as the issue suggested): if tool A returns images and a later tool result has no images, [trA, imgA, trB] still interleaves — grouping at the result push is the only complete minimal fix, and it keeps the consumer untouched.

Behavior preserved: multiple images keep per-tool order; single-tool-with-images and image-free turns are byte-identical; images with no tool results are never relocated.

Test Procedure

src/core/task/__tests__/Task.spec.ts (+1 regression test, 1 test updated to the new correct order with full block equality — stricter, not weaker): tr1 + 2 images + image-less tr2 → asserts [tr1, tr2, img1, img2].
src/core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts (+2 integration tests through the real presentAssistantMessage): two image-returning tools → [trA, trB, imgA, imgB]; first tool returns images, second returns none → images relocated after the second result. Both fail on main.
cd src && ./node_modules/.bin/vitest run core/assistant-message → 67/67 passed.
cd src && ./node_modules/.bin/vitest run core/task/__tests__/Task.spec.ts → 151/151 passed.
ESLint on all 3 changed files → clean.

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): N/A — no UI changes.
Documentation Impact: No documentation updates are required.
Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Visual Snapshots

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Videos (interaction / animation only)

N/A.

Documentation Updates

No documentation updates are required.

Additional Notes

Pre-existing follow-up (out of scope): a repetition-limit feedback text block can still land between tool results (presentAssistantMessage.ts ~684); this PR improves that case too (was tr, text, img, tr before). Happy to address separately if it ever manifests.

Get in Touch

GitHub: @myk1yt — please tag me here; I monitor notifications.

…blocks separately When a turn issued multiple tool_use blocks and tool results carried image blocks (read_file on images, screenshots, feedback images), presentAssistantMessage pushed each tool_result followed immediately by its images, yielding tool_result/image interleaving in userMessageContent. Task.ts then consumed the array verbatim, and the Anthropic API rejected the request with a 400: "tool_use ids were found without tool_result blocks immediately after" (Zoo-Code-Org#1307). pushToolResultToUserContent is the single choke point every tool_result push flows through, so it now maintains the invariant: when a new tool_result is appended, image blocks already accumulated are moved after it. The resulting user message is tool_results first (in tool_use order), then images, then other blocks — matching the shape the issue expects. A single tool result with images and image-free messages are unchanged.

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🔇 Additional comments (3)

src/core/task/Task.ts (1)

472-477: LGTM!

Also applies to: 495-503

src/core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts (1)

77-84: LGTM!

src/core/task/__tests__/Task.spec.ts (1)

6298-6302: LGTM!

📝 Summary

Summary by CodeRabbit

Bug Fixes
- Improved handling of results from parallel tool calls.
- Tool-result entries now remain grouped together and in the correct order.
- Images and other message content are consistently placed after all tool results.
- Preserved the original order of non-tool content.
- Duplicate tool results continue to be rejected.

The change keeps all tool_result blocks contiguous in task messages. It moves text and image blocks after the results and adds coverage for parallel calls and later results without images.

Changes: Tool-result contiguity

Layer / File(s)	Summary
Message block reordering `src/core/task/Task.ts`	`pushToolResultToUserContent` now partitions tool-result and non-tool blocks after adding a nonduplicate result. Its JSDoc documents the Anthropic ordering requirement.
Contiguity validation `src/core/task/__tests__/Task.spec.ts`, `src/core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts`	Tests verify ordered, contiguous tool results, preserved non-tool order, trailing images, and duplicate-result rejection for parallel and sequential results. The mock uses a typed content-block union.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Pre-merge checks: 8

Check name	Status	Explanation
Linked Issues check		Issue `#1307` requires contiguous `tool_result` blocks before images and text. `Task.pushToolResultToUserContent` now partitions `userMessageContent` into tool results followed by all other blocks, whil…
Out of Scope Changes check		The changes are limited to the shared tool-result insertion method and regression tests for Anthropic message ordering. The changes directly support issue `#1307`. No unrelated behavior or files are sho…
Regression Evidence		The changed behavior is isolated to `Task.pushToolResultToUserContent`. `src/core/task/__tests__/Task.spec.ts` exercises the real `Task` method and covers result-first ordering, contiguous results aft…
Security Boundaries		No changed path matches the security failure conditions. The only production change is `Task.pushToolResultToUserContent` in `src/core/task/Task.ts`; it filters existing message blocks by `type` and r…
Persistence Integrity		No changed persistence path matches the failure conditions. The PR changes only synchronous in-memory ordering in `Task.pushToolResultToUserContent` and related tests. `flushPendingToolResultsToHistor…
Lifecycle Resource Cleanup		PASS. The only production change is in `Task.pushToolResultToUserContent`: it filters `userMessageContent` and reorders the existing blocks with `splice`. It does not register or remove listeners, wat…
Title check		The title clearly and concisely describes the main change: keeping Anthropic tool_result blocks contiguous by grouping image blocks separately.
Description check		The description includes the linked issue, implementation details, test procedure and results, completed checklist, documentation status, and reviewer notes. It matches the repository template and exp…

Full details: Linked Issues check

Explanation

Issue #1307 requires contiguous tool_result blocks before images and text. Task.pushToolResultToUserContent now partitions userMessageContent into tool results followed by all other blocks, while preserving order within both groups. The duplicate-result guard remains active. Updated unit tests cover pre-existing text and images, and later results after images. Assistant-message tests cover multiple image-returning tools and mixed image/non-image results.

Full details: Out of Scope Changes check

Explanation

The changes are limited to the shared tool-result insertion method and regression tests for Anthropic message ordering. The changes directly support issue #1307. No unrelated behavior or files are shown.

Full details: Regression Evidence

Explanation

The changed behavior is isolated to Task.pushToolResultToUserContent. src/core/task/__tests__/Task.spec.ts exercises the real Task method and covers result-first ordering, contiguous results after intervening images, preservation of non-result order, duplicate rejection, and error results. The assistant-message tests use a matching mock, but the production method still has direct lowest-layer coverage. No UI behavior changed, so a Playwright snapshot is not required.

Full details: Security Boundaries

Explanation

No changed path matches the security failure conditions. The only production change is Task.pushToolResultToUserContent in src/core/task/Task.ts; it filters existing message blocks by type and reorders them with splice. It does not add secret or PII handling, input execution, or changes to approval or allowlist checks. The changed tests use synthetic tool IDs and image data only. Existing caller paths still sanitize tool IDs and validate tools before execution.

Full details: Persistence Integrity

Explanation

No changed persistence path matches the failure conditions. The PR changes only synchronous in-memory ordering in Task.pushToolResultToUserContent and related tests. flushPendingToolResultsToHistory and addToApiConversationHistory remain unchanged; they await the existing save flow, and saveApiConversationHistory still clones the history before saving. The diff adds no file-write logic, default propagation, rollback path, or unawaited persistence operation.

Full details: Lifecycle Resource Cleanup

Explanation

PASS. The only production change is in Task.pushToolResultToUserContent: it filters userMessageContent and reorders the existing blocks with splice. It does not register or remove listeners, watchers, providers, timers, tasks, or abort handlers. It does not add cancellation, disposal, restart, or retry work. The other changed files contain tests only. No changed lifecycle path can leak a resource or duplicate work after cancellation, disposal, or restart.

Full details: Description check

Explanation

The description includes the linked issue, implementation details, test procedure and results, completed checklist, documentation status, and reviewer notes. It matches the repository template and explains the fix clearly.

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Inline comments:
In `@src/core/task/Task.ts`:
- Around line 501-502: Update the content-reordering logic in pushToolResult so
all tool_result blocks are moved before other user-message blocks while
preserving the order within each group; update the related test mock and
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…ge content

edelauna · 2026-10-12T19:50:06Z

+			const results = mockTask.userMessageContent.filter(
+				(block: UserContentBlock) => block.type === "tool_result",
+			)
+			if (results.length !== mockTask.userMessageContent.length) {
+				const others = mockTask.userMessageContent.filter(
+					(block: UserContentBlock) => block.type !== "tool_result",
+				)
+				mockTask.userMessageContent.splice(0, mockTask.userMessageContent.length, ...results, ...others)
+			}


The two new tests in this file run this copied partition, and Task is automocked at the top of the spec. Would they still pass if the partition were removed from Task.ts? Could the mock bind the real method instead, with vi.importActual and Task.prototype.pushToolResultToUserContent?

Fixed in 73038d0. The mock now binds the real method instead of copying it:

let realPushToolResultToUserContent: RealPushToolResult beforeAll(async () => { const actual = await vi.importActual<typeof import("../../task/Task")>("../../task/Task") realPushToolResultToUserContent = actual.Task.prototype.pushToolResultToUserContent })

and beforeEach wires it onto the structural double with realPushToolResultToUserContent.call(mockTask, toolResult). The double only needs userMessageContent, which it already provides, so no other field of Task is constructed.

You asked whether the tests would still pass if the partition were removed from Task.ts. They no longer do. I deleted the partition block from Task.prototype.pushToolResultToUserContent and re-ran the spec:

FAIL core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts > ... > groups images after all tool_results when parallel tools return images FAIL core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts > ... > relocates an earlier tool's images after a later tool_result with no images Test Files 1 failed (1) Tests 2 failed | 7 passed (9)

With the partition restored the spec is 9/9 green. The two tests also now pass main's required policySnapshot argument (baseSnapshot).

edelauna · 2026-10-12T19:50:06Z

+		task.pushToolResultToUserContent(toolResult1)
+		task.userMessageContent.push(image1, image2)
+		task.pushToolResultToUserContent(toolResult2)


Would a change that moves only image blocks last, and leaves text ahead of them, fail any test here? This case has only images after the first result. Could a case that pushes an image, then text, then r1, then more text, then r2 expect [r1, r2, image, text, text2]?

Yes, it would have failed nothing, and you were right to flag it. The old case had only images after the first result, so an image-only grouping satisfied it. I added exactly the case you described in 73038d0:

it("moves text as well as images behind the tool_results, preserving order within each group", () => { // Interleaved arrival: image, text, r1, more text, r2. task.userMessageContent.push(image, text1) task.pushToolResultToUserContent(toolResult1) task.userMessageContent.push(text2) task.pushToolResultToUserContent(toolResult2) expect(task.userMessageContent).toEqual([toolResult1, toolResult2, image, text1, text2]) })

Input is [image, text, r1, text, r2] and the expectation is [r1, r2, image, text, text2], as you asked. Both mutation checks confirm it discriminates:

image-only grouping (move images last, leave text ahead): this new test FAILS, the rest pass. That is the exact gap you pointed at.

partition removed entirely: this test plus both [BUG]Tool results interleaved with image blocks break Anthropic API (tool_use without immediate tool_result) #1307 tests FAIL.

With the real implementation restored, core/task/__tests__/Task.spec.ts and core/assistant-message are 345/345 green.

github-actions · 2026-10-18T08:24:16Z

This PR has been awaiting author changes for 14 days and will be automatically closed in 7 days. Please address the review comments or leave a comment if you need more time.

github-actions · 2026-10-25T10:22:43Z

Closing due to author inactivity after requested changes. Feel free to reopen once the requested changes have been addressed.

History saved with image blocks between tool_result blocks (read_file on an image alongside another tool call in the same turn) is rejected by Anthropic with a 400 on every retry, leaving the task stuck. Reorder tool_result blocks to the front of each user message when shaping the API request, after merging consecutive user messages. Stored history is unchanged, so tasks already saved with the broken shape recover on their next retry. This complements Zoo-Code-Org#1705, which stops new messages from being built with the interleaved shape. Fixes Zoo-Code-Org#1774 Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

…nterleave Addresses edelauna's two review asks on Zoo-Code-Org#1705. 1. presentAssistantMessage-images.spec.ts bound a hand-copied partition of Task.pushToolResultToUserContent, so the Zoo-Code-Org#1307 tests were tautological: deleting the grouping from Task.ts still passed them. The mock now binds the real Task.prototype.pushToolResultToUserContent via vi.importActual. Verified: removing the partition from Task.ts fails both Zoo-Code-Org#1307 tests. 2. Task.spec.ts only covered "images after the first result". Added the mixed interleave [image, text, r1, text, r2] -> [r1, r2, image, text, text2], which fails under an image-only grouping and only passes with the full tool_result-first partition. Also carries main's new policySnapshot argument at the 2 integration call sites, and drops this spec's no-explicit-any suppressions from 16 to 14.

…blocks separately (Zoo-Code-Org#2243) * fix(anthropic): keep tool_result blocks contiguous by grouping image blocks separately When a turn issued multiple tool_use blocks and tool results carried image blocks (read_file on images, screenshots, feedback images), presentAssistantMessage pushed each tool_result followed immediately by its images, yielding tool_result/image interleaving in userMessageContent. Task.ts then consumed the array verbatim, and the Anthropic API rejected the request with a 400: "tool_use ids were found without tool_result blocks immediately after" (Zoo-Code-Org#1307). pushToolResultToUserContent is the single choke point every tool_result push flows through, so it now maintains the invariant: when a new tool_result is appended, image blocks already accumulated are moved after it. The resulting user message is tool_results first (in tool_use order), then images, then other blocks — matching the shape the issue expects. A single tool result with images and image-free messages are unchanged. * fix(anthropic): keep all tool_result blocks ahead of other user-message content * test(anthropic): bind the real tool_result grouping and cover mixed interleave Addresses edelauna's two review asks on Zoo-Code-Org#1705. 1. presentAssistantMessage-images.spec.ts bound a hand-copied partition of Task.pushToolResultToUserContent, so the Zoo-Code-Org#1307 tests were tautological: deleting the grouping from Task.ts still passed them. The mock now binds the real Task.prototype.pushToolResultToUserContent via vi.importActual. Verified: removing the partition from Task.ts fails both Zoo-Code-Org#1307 tests. 2. Task.spec.ts only covered "images after the first result". Added the mixed interleave [image, text, r1, text, r2] -> [r1, r2, image, text, text2], which fails under an image-only grouping and only passes with the full tool_result-first partition. Also carries main's new policySnapshot argument at the 2 integration call sites, and drops this spec's no-explicit-any suppressions from 16 to 14. * refactor(task): drop redundant guard in pushToolResultToUserContent --------- Co-authored-by: Zoo (VP) <[email protected]> Co-authored-by: Elliott de Launay <[email protected]>

…blocks separately (#2243) * fix(anthropic): keep tool_result blocks contiguous by grouping image blocks separately When a turn issued multiple tool_use blocks and tool results carried image blocks (read_file on images, screenshots, feedback images), presentAssistantMessage pushed each tool_result followed immediately by its images, yielding tool_result/image interleaving in userMessageContent. Task.ts then consumed the array verbatim, and the Anthropic API rejected the request with a 400: "tool_use ids were found without tool_result blocks immediately after" (#1307). pushToolResultToUserContent is the single choke point every tool_result push flows through, so it now maintains the invariant: when a new tool_result is appended, image blocks already accumulated are moved after it. The resulting user message is tool_results first (in tool_use order), then images, then other blocks — matching the shape the issue expects. A single tool result with images and image-free messages are unchanged. * fix(anthropic): keep all tool_result blocks ahead of other user-message content * test(anthropic): bind the real tool_result grouping and cover mixed interleave Addresses edelauna's two review asks on #1705. 1. presentAssistantMessage-images.spec.ts bound a hand-copied partition of Task.pushToolResultToUserContent, so the #1307 tests were tautological: deleting the grouping from Task.ts still passed them. The mock now binds the real Task.prototype.pushToolResultToUserContent via vi.importActual. Verified: removing the partition from Task.ts fails both #1307 tests. 2. Task.spec.ts only covered "images after the first result". Added the mixed interleave [image, text, r1, text, r2] -> [r1, r2, image, text, text2], which fails under an image-only grouping and only passes with the full tool_result-first partition. Also carries main's new policySnapshot argument at the 2 integration call sites, and drops this spec's no-explicit-any suppressions from 16 to 14. * refactor(task): drop redundant guard in pushToolResultToUserContent --------- Co-authored-by: Zoo (VP) <[email protected]> Co-authored-by: Elliott de Launay <[email protected]>

…blocks separately (Zoo-Code-Org#2243) * fix(anthropic): keep tool_result blocks contiguous by grouping image blocks separately When a turn issued multiple tool_use blocks and tool results carried image blocks (read_file on images, screenshots, feedback images), presentAssistantMessage pushed each tool_result followed immediately by its images, yielding tool_result/image interleaving in userMessageContent. Task.ts then consumed the array verbatim, and the Anthropic API rejected the request with a 400: "tool_use ids were found without tool_result blocks immediately after" (Zoo-Code-Org#1307). pushToolResultToUserContent is the single choke point every tool_result push flows through, so it now maintains the invariant: when a new tool_result is appended, image blocks already accumulated are moved after it. The resulting user message is tool_results first (in tool_use order), then images, then other blocks — matching the shape the issue expects. A single tool result with images and image-free messages are unchanged. * fix(anthropic): keep all tool_result blocks ahead of other user-message content * test(anthropic): bind the real tool_result grouping and cover mixed interleave Addresses edelauna's two review asks on Zoo-Code-Org#1705. 1. presentAssistantMessage-images.spec.ts bound a hand-copied partition of Task.pushToolResultToUserContent, so the Zoo-Code-Org#1307 tests were tautological: deleting the grouping from Task.ts still passed them. The mock now binds the real Task.prototype.pushToolResultToUserContent via vi.importActual. Verified: removing the partition from Task.ts fails both Zoo-Code-Org#1307 tests. 2. Task.spec.ts only covered "images after the first result". Added the mixed interleave [image, text, r1, text, r2] -> [r1, r2, image, text, text2], which fails under an image-only grouping and only passes with the full tool_result-first partition. Also carries main's new policySnapshot argument at the 2 integration call sites, and drops this spec's no-explicit-any suppressions from 16 to 14. * refactor(task): drop redundant guard in pushToolResultToUserContent --------- Co-authored-by: Zoo (VP) <[email protected]> Co-authored-by: Elliott de Launay <[email protected]> (cherry picked from commit 70eba96)

myk1yt requested review from JamesRobert20, edelauna, hannesrudolph, navedmerchant and taltas as code owners September 19, 2026 23:43

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fix(task): lead each request user message with its tool_result blocks #1839

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[BUG] Image read_file combined with other tool calls produces Anthropic 400 error #1774

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fix(anthropic): keep tool_result blocks contiguous by grouping image blocks separately #2243

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fix(anthropic): keep tool_result blocks contiguous by grouping image blocks separately - #1705

fix(anthropic): keep tool_result blocks contiguous by grouping image blocks separately#1705
myk1yt wants to merge 2 commits into
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myk1yt:fix/1307-group-images-after-tool-results

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myk1yt commented Sep 19, 2026

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