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##[error] Could not assign agent: target repository is not writable.
GraphQL mutation: replaceActorsForAssignable
Type: FORBIDDEN
Root Cause: The GITHUB_TOKEN used by the safe_outputs job lacks sufficient permissions to assign GitHub Copilot agents to issues using the replaceActorsForAssignable GraphQL mutation. This operation attempted to assign @copilot to issue Duplicate Code: close_* action config parsing/logging #15309.
Impact: Low - Issue was created successfully. Only the automatic agent assignment failed. The issue remains actionable, just without an automatic assignee.
Root Cause Analysis
Permission-Related Issues
Issue: Agent Assignment FORBIDDEN Error
Location: Safe outputs job attempting to assign @copilot to newly created issue
Error Type: GraphQL API Permission Error (FORBIDDEN)
Problem: Safe outputs job fails (marks entire job as failed) when agent assignment permission is denied, even though the core operation (issue creation) succeeded
Fix: Wrap agent assignment operations in try-catch and treat permission errors as warnings rather than failures. The job should succeed if the primary operation (create_issue) succeeds, regardless of activation step outcomes.
Affected Jobs: Any workflow that uses @mentions for agent assignment in safe output bodies
Code Change Needed:
// Instead of:awaitassignAgent(issueId,agentLogin);// throws on permission error// Use:try{awaitassignAgent(issueId,agentLogin);core.info(`Successfully assigned \$\{agentLogin} to issue`);}catch(error){if(error.type==='FORBIDDEN'){core.warning(`Could not assign agent: \$\{error.message}`);core.info('Issue created successfully. Manual assignment may be required.');}else{throwerror;// Re-throw unexpected errors}}
Configuration Changes
Investigate GitHub Token Permissions for Agent Assignment
Current: GITHUB_TOKEN has issues: write but may lack agent assignment capability
Recommended: Investigate whether additional permissions are needed:
GitHub App permissions for agent operations
Repository settings for agent assignments
Enterprise-level permissions
Reason: Understand if this is a permission configuration issue or an API limitation
Process Improvements
Make Agent Assignment Non-Blocking
Current State: Agent assignment failures cause safe output job to fail
Proposed: Treat agent assignment as an optional enhancement, not a required step
Benefits:
Higher safe output success rate
Clearer separation of concerns (content creation vs. assignment)
Better error messages for users
Add Permission Pre-Flight Checks
Current State: Permission errors are only discovered when operations are attempted
Proposed: Check for required permissions before attempting operations and skip unsupported actions with clear warnings
Benefits:
Predictable behavior
Better user experience with clear capability boundaries
Reduced error noise in logs
Work Item Plans
Work Item 1: Graceful Agent Assignment Error Handling
Type: Bug Fix
Priority: High
Description: Modify safe output processing to treat agent assignment permission errors as non-fatal warnings rather than job failures. The core safe output operation (issue/PR/discussion creation) should be considered successful even if subsequent activation steps (like agent assignment) fail due to permissions.
Acceptance Criteria:
Safe outputs job succeeds when issue/PR/discussion is created successfully, regardless of assignment outcome
Permission errors during agent assignment are logged as warnings, not errors
Job summary clearly indicates which operations succeeded and which were skipped due to permissions
Existing workflows continue to function without modification
Technical Approach:
Identify agent assignment code in safe output handlers (likely in activation or issue creation logic)
Wrap assignment operations in try-catch blocks
Check for GraphQL FORBIDDEN errors specifically
Log warnings and continue execution for permission errors
Update job status logic to consider primary operation (create_issue) success independently from activation success
Estimated Effort: Small (4-6 hours including testing)
Dependencies: None
Files to Modify:
actions/setup/js/create_issue.cjs (or similar safe output handler)
Activation logic that processes @mentions
Work Item 2: Document Agent Assignment Limitations
Type: Documentation
Priority: Medium
Description: Document known limitations around agent assignment in safe outputs, including required permissions and alternative approaches when automatic assignment fails.
Acceptance Criteria:
Documentation clearly states agent assignment requirements
Alternative workflows are documented (manual assignment, workflow-level permissions)
Error messages reference the documentation
Technical Approach:
Research GitHub API requirements for replaceActorsForAssignable mutation
Test agent assignment in different repository contexts (public/private/enterprise)
Document findings in safe-outputs.md or relevant configuration docs
Add troubleshooting section for common permission errors
Estimated Effort: Medium (8-12 hours including research and testing)
Dependencies: Work Item 1 (understanding the error handling helps document expected behavior)
Historical Context
Trends:
This is the first safe output health audit, so no historical comparison is available
The 96% success rate is a strong baseline for future monitoring
No recurring patterns detected (only 1 failure across 26 jobs)
Comparison to Agent/Detection Jobs:
Safe output jobs are performing well (96% success)
The failure is isolated and has a clear root cause
No systemic issues detected
Metrics and KPIs
Overall Safe Output Success Rate: 96.0% ✅
Most Reliable Job Type: create_pull_request (8 successful operations, 0 failures)
Most Common Output Type: create_pull_request (8 occurrences)
Zero Critical Failures: No data loss, corruption, or blocking issues ✅
System Health: Excellent - Single non-critical permission error
Why It Was Skipped:
The safe_outputs job was skipped because the agent did not produce any safe outputs during its execution. This is normal and expected behavior.
Job Outcomes:
Agent job: Completed successfully ✅
Detection job: Skipped (no outputs to detect) ✓
Safe outputs job: Skipped (no outputs to process) ✓
Update cache memory job: Skipped (no cache updates needed) ✓
Monitor next 24 hours to confirm this is an isolated incident
Short-term Actions (1-2 weeks):
Research GitHub API permissions for agent assignment (Work Item 2)
Document agent assignment limitations and workarounds
Review other activation operations for similar permission issues
Long-term Actions (1+ months):
Establish daily safe output health monitoring
Create alerting for success rate drops below 95%
Build dashboard for safe output metrics over time
Conclusion
The safe output system is in excellent health with a 96% success rate over the last 24 hours. The single failure is a non-critical permission error that did not prevent the primary operation (issue creation) from succeeding. The recommended fix is straightforward: treat agent assignment as an optional enhancement rather than a required step.
System Status: ✅ HEALTHY
Key Takeaways:
Core safe output operations (create_issue, create_pr, create_discussion) are working reliably
Permission errors should be handled more gracefully
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Executive Summary
Safe Output Job Statistics
Safe Output Types Observed:
create_issue: 6 executionscreate_pull_request: 8 executionscreate_discussion: 3 executionsadd_labels: 2 executionsnoop: 5 executionsunassign_from_user: 1 executionError Clusters
Cluster 1: Permission Error - Agent Assignment Failure
replaceActorsForAssignableGraphQL mutation. This operation attempted to assign@copilotto issue Duplicate Code: close_* action config parsing/logging #15309.Root Cause Analysis
Permission-Related Issues
Issue: Agent Assignment FORBIDDEN Error
Location: Safe outputs job attempting to assign
@copilotto newly created issueError Type: GraphQL API Permission Error (FORBIDDEN)
Technical Details:
replaceActorsForAssignable@copilot(GitHub Copilot agent)Why This Happened:
What Worked:
@copilot) was included ✅What Failed:
Recommendations
Critical Issues (Immediate Action Required)
None identified - The single failure is non-critical and has a clear workaround.
Bug Fixes Required
@mentionsfor agent assignment in safe output bodiesConfiguration Changes
issues: writebut may lack agent assignment capabilityProcess Improvements
Make Agent Assignment Non-Blocking
Add Permission Pre-Flight Checks
Work Item Plans
Work Item 1: Graceful Agent Assignment Error Handling
actions/setup/js/create_issue.cjs(or similar safe output handler)@mentionsWork Item 2: Document Agent Assignment Limitations
replaceActorsForAssignablemutationHistorical Context
Trends:
Comparison to Agent/Detection Jobs:
Metrics and KPIs
Detailed Failure Analysis
Run §21977434383 - Duplicate Code Detector
Timeline:
What the Agent Produced:
create_issue@copilotOutcome:
@copilotfailed (activation operation)User Impact:
Skipped Jobs Analysis
Run §21977637610 - CI Failure Doctor
Why It Was Skipped:
The safe_outputs job was skipped because the agent did not produce any safe outputs during its execution. This is normal and expected behavior.
Job Outcomes:
Status: Normal operation - no issues
Next Steps
Immediate Actions:
Short-term Actions (1-2 weeks):
Long-term Actions (1+ months):
Conclusion
The safe output system is in excellent health with a 96% success rate over the last 24 hours. The single failure is a non-critical permission error that did not prevent the primary operation (issue creation) from succeeding. The recommended fix is straightforward: treat agent assignment as an optional enhancement rather than a required step.
System Status: ✅ HEALTHY
Key Takeaways:
Analysis Period: 2026-02-13 (Last 24 hours)
Workflow Runs Analyzed: 31
Safe Output Jobs Analyzed: 26
References:
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