Hey, thanks for the report. This is a known issue with the create_plan tool in Composer 1 when creating or editing plans.
Bug: When the tool can’t find valid strings to replace in the plan after several attempts, it times out with the error “Invalid String to Replace”.
Workaround:
- Copy the markdown content of the plan
- Open a new agent window
- Paste the copied plan and continue working there
Similar: Cursor planning mode crash
To pass this to the engineers, please share:
- Request ID of the stuck request (chat menu top right > Copy Request ID, with Privacy Mode off)
- Help > Toggle Developer Tools > Console (screenshot of errors at timeout)
- Reproduction steps: what exactly you asked to do with the plan before the error
I’ll attach your report to the existing issue.