What this error means
Claude Code Figma connector loaded by VSCode extension despite being disabled in web + Desktop + /mcp UI is a Claude Code failure pattern reported for developers trying to fix claude code vscode extension loading disabled mcp connectors like figma. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.
Why this happens
Three official UI toggles (web, Desktop, /mcp) do not propagate disabled state. Extension still attempts handshake with disabled connector. Fails with -32600. Only manual JSON edit silences it. Max plan subscriber affected.
Common causes
- Figma connector still loads and attempts JSON-RPC handshake even after being disabled in claude.ai web, Claude Desktop, and extension /mcp UI. Handshake fails with '-32600 Invalid content from server' causing the [object Object] toast. Only manual edit to disabledMcpServers in ~/.claude.json works.
- Three official UI toggles (web, Desktop, /mcp) do not propagate disabled state. Extension still attempts handshake with disabled connector. Fails with -32600. Only manual JSON edit silences it. Max plan subscriber affected.
Quick fixes
- Confirm the exact error signature matches
Claude Code Figma connector loaded by VSCode extension despite being disabled in web + Desktop + /mcp UI. - Check the Claude Code 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.