Error text / 报错原文
openai/outputTemplate not foundoutputTemplate not foundtemplate resource missing
What it means
The tool result references a widget template URI that the app does not serve or declare correctly.
Most common causes
- Template URI typo
- Resource endpoint returns HTML instead of the expected template
- Tool _meta points to a stale template path
- Deploy path differs from local path
Fastest fix
- Reproduce the smallest failing case outside the agent.
- Confirm auth, session, and transport before changing app code.
- Disable unrelated tools or servers and retry once.
- Capture the exact timestamp, client version, and raw error text.
Safe fix
- Keep secrets in environment variables or the platform secret store.
- Use least-privilege scopes and read-only tools by default.
- Add validation around manifests, schemas, and callback URLs.
- Document the working local and production configuration.
What not to do
- Do not paste OAuth tokens or session IDs into public logs.
- Do not bypass TLS, CSP, or permission prompts as a permanent fix.
- Do not enable every MCP tool globally just to make one task pass.
Diagnostic commands
node --version curl -I "$MCP_SERVER_URL" echo "$OAUTH_CLIENT_ID"