Add root cause analysis for PR #11131: Tool block ID sanitization with version history #2
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Co-authored-by: dreness <5242016+dreness@users.noreply.github.com>
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[WIP] Investigate root cause of tool block id sanitization
Add root cause analysis for PR #11131: Tool block ID sanitization
Feb 1, 2026
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@copilot Through code inspection, try to determine how far prior to 3.46.0. the bug existed. |
- Traced bug introduction to v3.40.0 (Jan 13, 2026) via PR RooCodeInc#10649 - Bug persisted for 18 days across versions 3.40.x through 3.46.0 - Fixed in v3.46.1 (Jan 31, 2026) via PR RooCodeInc#11131 - Added detailed version timeline showing affected releases - Documented that prior versions had no mismatch errors but had API validation errors instead Co-authored-by: dreness <5242016+dreness@users.noreply.github.com>
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The bug was introduced in v3.40.0 (January 13, 2026) via PR RooCodeInc#10649 (commit It persisted for 18 days through versions:
Prior to v3.40.0, the function didn't exist, so IDs were unsanitized on both sides—no mismatch errors, but providers with special characters caused API validation errors instead. Updated in commit f39c7ba. |
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Add root cause analysis for PR #11131: Tool block ID sanitization
Add root cause analysis for PR #11131: Tool block ID sanitization with version history
Feb 1, 2026
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Related GitHub Issue
N/A - Documentation-only contribution
Roo Code Task Context (Optional)
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Description
Adds comprehensive analysis of the
ToolResultIdMismatchErrorbug fixed in upstream PR RooCodeInc#11131 (RooCodeInc/Roo-Code).Root Cause: Split-brain ID sanitization
Task.tssanitized tool_use IDs before saving to API history (functions.read_file:0→functions_read_file_0)presentAssistantMessage.tsdid NOT sanitize tool_result IDs, causing validation mismatchesBug History: Through code inspection, determined the bug was introduced in v3.40.0 (January 13, 2026) via PR RooCodeInc#10649 (commit
621d950) and persisted for 18 days through versions 3.40.x, 3.41.x, 3.42.x, 3.43.x, 3.44.x, 3.45.x, and 3.46.0 before being fixed in v3.46.1 (January 31, 2026).Prior to v3.40.0, the
sanitizeToolUseId()function didn't exist, so both tool_use and tool_result IDs were unsanitized (matching correctly), but providers with special characters caused API validation errors instead.Relationship to Queued User Prompts:
Queued prompts expose timing-dependent code paths where
flushPendingToolResultsToHistory()triggersvalidateAndFixToolResultIds(). Without consistent sanitization, these validation points systematically reported errors for Gemini/OpenRouter/MCP providers that generate IDs with special characters.Deliverable:
PR-11131-ROOT-CAUSE-ANALYSIS.mdTest Procedure
Review the markdown report:
Cross-reference against:
src/core/task/validateToolResultIds.ts- validation logicsrc/core/assistant-message/presentAssistantMessage.ts- where fix was appliedsrc/core/task/Task.ts:3459-3480- original sanitization locationPre-Submission Checklist
Screenshots / Videos
N/A - documentation only
Documentation Updates
Additional Notes
Report structure:
Analysis covers the complete lifecycle from v3.39.3 (pre-bug) through v3.40.0 (introduction) to v3.46.1 (fix), with specific focus on ID sanitization's relationship to queued user prompt handling.
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Original prompt
💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.