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_errors with 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_tool spans completing but agent state never progresses. Reproduces consistently in affected sessions.

Quick fixes

  1. Confirm the exact error signature matches Copilot stuck evaluating/analyzing/planning.
  2. Check the GitHub Copilot account, local tool state, and provider configuration involved in the failing workflow.
  3. 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

  1. Capture the exact error message and the command, editor action, or request that triggered it.
  2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
  3. Review the source evidence below and compare it with your environment.
  4. Apply one change at a time and rerun the smallest failing action.
  5. 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.