[BUG] Force-stopping a workflow clears the agent journal/cache, breaking resume

[karanshukla]

Preflight Checklist

• I have searched existing issues and this hasn't been reported yet
• This is a single bug report (please file separate reports for different bugs)
• I am using the latest version of Claude Code

What's Wrong?

Force-killing a workflow (TaskStop) clears the journal cache. When a workflow is stopped mid-run
and then resumed with resumeFromRunId, the completed agent results are not replayed from cache — the
workflow restarts from 0. The docs say completed agents return cached results on resume, but this
doesn't hold when the prior run was stopped rather than naturally completed/failed.

Repro for #1: Launch a workflow with 50+ agents, stop it mid-run with TaskStop, then call
Workflow({scriptPath, resumeFromRunId}) — progress resets to 0/N instead of continuing from where it
left off.

What Should Happen?

It should pick up on the cached data from the agents

Error Messages/Logs

Steps to Reproduce

1. Launch a workflow with many parallel agents (we had ~59):
   Workflow({ script: "..." })
2. Note the returned Run ID (e.g. wf_fa220529-84e) and Task ID (e.g. wu1wgavg2).
3. Let it run partially — some agents complete, some fail or are still in-flight.
4. Attempt to resume the still-running workflow:
   Workflow({ scriptPath: "...", resumeFromRunId: "wf_fa220529-84e" })
5. → This correctly errors: "Workflow is still running. Stop it first with TaskStop."
6. Stop the running workflow:
   TaskStop({ task_id: "wu1wgavg2" })
7. Resume with the same run ID:
   Workflow({ scriptPath: "...", resumeFromRunId: "wf_fa220529-84e" })
8. Expected: Completed agents replay from cache; only failed/incomplete agents re-run. Progress
   counter starts at e.g. 32/59.
9. Actual: Workflow restarts from 0/59. All agents re-run from scratch, including ones that had
   already completed successfully.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

2.1.195

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

No response

[github-actions]

Found 3 possible duplicate issues:

1. [Bug] Agent workflow resumes rerun completed tasks instead of resuming from checkpoint #67768
2. [Bug] Workflow resume re-runs completed fetch agents instead of using journal cache #67488
3. Workflow (multi-agent) resume restarts from the beginning after auto-compaction — silently re-runs completed agents #65796

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