openclaw - ✅(Solved) Fix [Bug]: isRawToolCallBlock misses snake_case tool call types (tool_use, tool_call), causing corrupted session history errors with Anthropic [2 pull requests, 2 comments, 3 participants]

openclaw2026-03-17 10:10:16

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openclaw/openclaw#48915•Fetched 2026-04-08 00:51:07

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The function isRawToolCallBlock in the session history repair logic only recognizes camelCase tool call block types (toolUse, toolCall, functionCall), but does NOT handle the snake_case variants used by Anthropic and some other providers (tool_use, tool_call, function_call).

This causes repairToolCallInputs - which is supposed to sanitize corrupted history before sending to the model - to silently skip over broken tool_use blocks that are missing their input field.

Error Message

The broken tool_use block is skipped during repair, leading to a "field required" error from Anthropic and a "Session history looks corrupted" error in OpenClaw.

Root Cause

In reply-Bm8VrLQh.js, the function:

function isRawToolCallBlock(block) {
  if (!block || typeof block !== "object") return false;
  const type = block.type;
  return typeof type === "string" && (type === "toolCall" || type === "toolUse" || type === "functionCall");
}

Fix Action

Fixed

Fixed by PR: fix: add snake_case tool call types to isRawToolCallBlock (https://github.com/openclaw/openclaw/pull/48921)
Fixed by PR: fix(agents): recognize snake_case tool call types in session history repair (#48915) (https://github.com/openclaw/openclaw/pull/48985)

PR fix notes

PR #48921: fix: add snake_case tool call types to isRawToolCallBlock

Repository: openclaw/openclaw
Author: ShionEria
State: closed | merged: False
Link: https://github.com/openclaw/openclaw/pull/48921

Description (problem / solution / changelog)

Problem

The function only recognized camelCase tool call block types (, , ) but missed the snake_case variants (, , ) used by Anthropic and some other providers.

This caused — which sanitizes corrupted history before sending to the model — to silently skip over broken blocks missing their field.

Fix

Added the three snake_case variants to the type check condition.

Fixes #48915

Testing

All 23 existing tests in pass.

Changed files

src/agents/session-transcript-repair.ts (modified, +10/-2)
src/cli/tui-cli.ts (modified, +13/-1)

PR #48985: fix(agents): recognize snake_case tool call types in session history repair (#48915)

Repository: openclaw/openclaw
Author: MoerAI
State: closed | merged: False
Link: https://github.com/openclaw/openclaw/pull/48985

Description (problem / solution / changelog)

Summary

isRawToolCallBlock only matched camelCase block types (toolCall, toolUse, functionCall), missing the snake_case variants (tool_call, tool_use, function_call) emitted by Anthropic and some other providers. This caused repairToolCallInputs to skip over broken tool_use blocks that were missing their input field, leading to persistent "corrupted session" errors that even /new could not resolve.

Root Cause

When a streamed tool call is interrupted mid-stream (e.g. timeout, abort), a tool_use block without an input field gets persisted in the session transcript. On the next message, the history repair pass calls isRawToolCallBlock to detect these blocks — but because it only checks camelCase types, the snake_case tool_use block is invisible to the repair logic. Anthropic's API then rejects the request with messages.N.content.N.tool_use.input: field required.

Changes

src/agents/session-transcript-repair.ts: Add tool_call, tool_use, function_call to the type check in isRawToolCallBlock
src/agents/session-transcript-repair.test.ts: Add regression test for snake_case tool_use block without input; update TOOL_CALL_BLOCK_TYPES test helper

Test

All 24 tests pass (23 existing + 1 new regression test):

✓ src/agents/session-transcript-repair.test.ts (24 tests) 9ms

Closes #48915

Changed files

src/agents/session-transcript-repair.test.ts (modified, +22/-1)
src/agents/session-transcript-repair.ts (modified, +7/-1)

Code Example

function isRawToolCallBlock(block) {
  if (!block || typeof block !== "object") return false;
  const type = block.type;
  return typeof type === "string" && (type === "toolCall" || type === "toolUse" || type === "functionCall");
}

---

function isRawToolCallBlock(block) {
  if (!block || typeof block !== "object") return false;
  const type = block.type;
  return typeof type === "string" && (
    type === "toolCall" || type === "toolUse" || type === "functionCall" ||
    type === "tool_call" || type === "tool_use" || type === "function_call"
  );
}

---

RAW_BUFFERClick to expand / collapse

Bug type

Behavior bug (incorrect output/state without crash)

Summary

This causes repairToolCallInputs - which is supposed to sanitize corrupted history before sending to the model - to silently skip over broken tool_use blocks that are missing their input field.

Root Cause

In reply-Bm8VrLQh.js, the function:

function isRawToolCallBlock(block) {
  if (!block || typeof block !== "object") return false;
  const type = block.type;
  return typeof type === "string" && (type === "toolCall" || type === "toolUse" || type === "functionCall");
}

Proposed Fix

function isRawToolCallBlock(block) {
  if (!block || typeof block !== "object") return false;
  const type = block.type;
  return typeof type === "string" && (
    type === "toolCall" || type === "toolUse" || type === "functionCall" ||
    type === "tool_call" || type === "tool_use" || type === "function_call"
  );
}

Impact

Users in Feishu groups experience persistent "corrupted session" errors that /new cannot reliably resolve, because the broken block survives the sanitization pass every time.

Steps to reproduce

Use OpenClaw with Anthropic as provider in a Feishu group chat.
1. A streamed tool call response is interrupted mid-stream (e.g., timeout, abort), leaving a tool_use block persisted in the session transcript without an input field.
1. On the next message (even after /new), the history is loaded and passed through repairToolCallInputs, but the broken block is not detected because its type "tool_use" doesn't match the check.
1. Anthropic's API rejects the request with: messages.N.content.N.tool_use.input: field required
1. OpenClaw surfaces this as: "Session history looks corrupted (tool call input missing). Use /new to start a fresh session."

Expected behavior

The session history should be correctly repaired/sanitized, and Anthropic API should not reject the request due to missing input fields.

Actual behavior

The broken tool_use block is skipped during repair, leading to a "field required" error from Anthropic and a "Session history looks corrupted" error in OpenClaw.

OpenClaw version

2026.3.13

Operating system

macOS

Install method

npm global

Model

anthropic/claude-sonnet-4.5

Provider / routing chain

openclaw -> anthropic

Config file / key location

No response

Additional provider/model setup details

No response

Logs, screenshots, and evidence

Impact and severity

Affected: Feishu group chat users using Anthropic as provider. Severity: High (blocks workflow, persistent "corrupted session" errors). Frequency: Always (reproducible when tool calls are interrupted). Consequence: Agent cannot respond even after /new if broken content is in history.

Additional information

No response

extent analysis

Fix Plan

To fix the issue, update the isRawToolCallBlock function to recognize both camelCase and snake_case variants of tool call block types.

Update the isRawToolCallBlock function as follows:

function isRawToolCallBlock(block) {
  if (!block || typeof block !== "object") return false;
  const type = block.type;
  return typeof type === "string" && (
    type === "toolCall" || type === "toolUse" || type === "functionCall" ||
    type === "tool_call" || type === "tool_use" || type === "function_call"
  );
}

Alternatively, consider using a more flexible approach with an array of allowed types and the includes() method:

const allowedTypes = [
  "toolCall", "toolUse", "functionCall",
  "tool_call", "tool_use", "function_call"
];

function isRawToolCallBlock(block) {
  if (!block || typeof block !== "object") return false;
  const type = block.type;
  return typeof type === "string" && allowedTypes.includes(type);
}

Verification

To verify the fix, follow these steps:

Reproduce the issue using the steps provided in the problem description.
Apply the updated isRawToolCallBlock function.
Repeat the steps to reproduce the issue and verify that the "corrupted session" error no longer occurs.

Extra Tips

Consider adding unit tests to ensure the isRawToolCallBlock function works correctly for different input types and variants. Additionally, review other parts of the codebase for similar issues with case sensitivity and type checking.

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Time Saver

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Blocking

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Common Issue

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FAQ

Expected behavior

The session history should be correctly repaired/sanitized, and Anthropic API should not reject the request due to missing input fields.

#api #ssr #installation #tensor shape #autograd error #authentication issue #prompt issue #agent setup #task chaining

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openclaw - ✅(Solved) Fix [Bug]: isRawToolCallBlock misses snake_case tool call types (tool_use, tool_call), causing corrupted session history errors with Anthropic [2 pull requests, 2 comments, 3 participants]

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Error Message

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Fix Action

Fixed

PR fix notes

PR #48921: fix: add snake_case tool call types to isRawToolCallBlock

Description (problem / solution / changelog)

Problem

Fix

Testing

Changed files

PR #48985: fix(agents): recognize snake_case tool call types in session history repair (#48915)

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Changed files

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