What this error means
Copilot stuck evaluating/analyzing/planning is a GitHub Copilot failure pattern reported for developers trying to fix github copilot chat stuck forever in evaluating/analyzing/planning state. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.
Why this happens
GitHub issue #312526 on microsoft/vscode (14 comments, open since 2026-04-25). VS Code 1.118.0-insider with Copilot Chat Extension 0.46.2026042405. Happens specifically with GPT 5.4/5.3/5.5 models. Trace logs show execute_tool spans completing but agent state never progresses. Reproduces consistently in affected sessions.
Common causes
- GitHub Copilot Chat extension in VS Code becomes permanently stuck in 'evaluating/analyzing/planning' state when using GPT-family models. Users see the tool call executing (
get_errorswith multiple file paths) but never get a response. Affects 14+ users across multiple sessions. Only reproducible in certain chat sessions, suggesting session state corruption. - GitHub issue #312526 on microsoft/vscode (14 comments, open since 2026-04-25). VS Code 1.118.0-insider with Copilot Chat Extension 0.46.2026042405. Happens specifically with GPT 5.4/5.3/5.5 models. Trace logs show
execute_toolspans completing but agent state never progresses. Reproduces consistently in affected sessions.
Quick fixes
- Confirm the exact error signature matches
Copilot stuck evaluating/analyzing/planning. - Check the GitHub Copilot account, local tool state, and provider configuration involved in the failing workflow.
- Compare the failing environment with a known working setup, then change one configuration value at a time.
Platform/tool-specific checks
- Verify the command, editor, extension, or API client that produced the error.
- Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
- Avoid deleting credentials, local model data, or project settings until the failing scope is clear.
Step-by-step troubleshooting
- Capture the exact error message and the command, editor action, or request that triggered it.
- Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
- Review the source evidence below and compare it with your environment.
- Apply one change at a time and rerun the smallest failing action.
- Keep the working fix documented for the team or deployment environment.
How to prevent it
- Keep provider/tool configuration documented.
- Record non-secret diagnostics such as tool version, provider name, model name, and command path.
- Add a lightweight check before CI or production workflows depend on the tool.