Troubleshoot plugins changedplugins/troubleshooting
Nearest release: v2.1.309, published 5 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 23 Oct 2026 02:28 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 23 Oct 2026 02:37 UTC.
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899899To read the error the server printed while starting, run `claude --debug` and open the log at `~/.claude/debug/<session-id>.txt`. The `--debug` flag doesn't print to the terminal.
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901> [!NOTE]
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903> When a connection to a [plugin's stdio server](/docs/en/mcp.md#plugin-provided-mcp-servers) failed less than 15 minutes before you ran `claude --debug`, Claude Code [doesn't start the server](/docs/en/errors.md#skipping-connection-recent-failure-cached). In the new session, select **Reconnect** from the server's menu in `/mcp` to start it, then open the log.
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901905A server entry in `.mcp.json` that fails the schema doesn't appear in the **Errors** tab. Claude Code drops that server and records `Invalid MCP server config for <server> in <path>` only in that debug log. To find the entry without loading the plugin, run `claude plugin validate` in your shell on the plugin directory, which reports it as an error.
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903907Before v2.1.281, `claude plugin validate` didn't check `.mcp.json`.
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