Description

The Claude Code GitHub Action workflow hangs indefinitely after Claude completes its task. The action successfully posts the review/response but never terminates.

Observed Behavior

1. Claude Code action triggers on PR comment
2. Claude successfully reads files, analyzes code, and posts review comment
3. Workflow never exits - runs until manually cancelled or hits timeout

Root Cause Analysis

Investigation of the workflow logs revealed orphan bun processes at cleanup time:

Cleaning up orphan processes
Terminate orphan process: pid (2169) (bun)
Terminate orphan process: pid (2178) (bun)
Terminate orphan process: pid (2210) (npm exec @model)
Terminate orphan process: pid (2211) (bun)
Terminate orphan process: pid (2212) (bun)
Terminate orphan process: pid (2242) (sh)

These bun processes appear to be the MCP servers (github_comment and github_ci) that are spawned but not properly terminated when Claude completes its work.

Timeline from logs

• 12:38:06 - Placeholder comment created
• 12:38:26 - Claude Code initialized
• 12:52:37 - Manually cancelled (14 minute gap with NO logged activity)

Reproduction

1. Set up claude-code-action with default configuration
2. Comment @claude can you review this PR please on a PR
3. Claude successfully posts review but workflow never terminates

Workaround

Adding timeout-minutes: 15 to the job prevents indefinite hangs, but this is just a safeguard - the MCP servers should terminate properly.

Environment

• anthropics/claude-code-action@v1
• Triggered via issue_comment event
• Ubuntu latest runner

Failed run

https://github.com/sbushell92/the-pe-dept/actions/runs/21397472773