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MCP compatibility: don't error when prompts/list is unsupported (-32601) #26048
Description
Summary
When an MCP server does not implement prompts/list, OpenCode Desktop logs repeated errors like:
MCP error -32601: Method not found failed to get prompts
This appears to be a compatibility issue rather than a true server failure. Many MCP servers provide tools but no prompts.
Environment
- OpenCode Desktop:
1.14.28 - macOS: Apple Silicon
- MCP servers observed:
context7(local),grep_app(remote)
Reproduction
- Configure an MCP server that supports tools but does not support prompts.
- Start OpenCode Desktop.
- Observe logs in
~/.local/share/opencode/log/*.log.
Actual behavior
OpenCode treats missing prompts support as an error and repeatedly logs -32601 Method not found.
Expected behavior
If prompts/list is unsupported (-32601), OpenCode should treat it as "no prompts" and continue without error-level logging.
Why this matters
- Creates noisy logs and false alarms.
- Makes healthy MCP setups look broken.
- Impacts multiple MCP servers, not one specific provider.
Suggested fix
In MCP prompt discovery, catch -32601 / "Method not found" for listPrompts() and return [].
Pseudo behavior:
await client.listPrompts()
.then(r => r.prompts)
.catch(err => {
if (err?.code === -32601 || /Method not found/i.test(err?.message ?? "")) {
return []
}
throw err
})Temporary workaround I validated locally
I patched the Desktop app bundle to ignore -32601 for prompt listing, and the repeated MCP prompt errors disappeared while tool calls still worked.
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github-actions commentedon May 6, 2026
This issue might be a duplicate of existing issues. Please check:
prompts/list(-32601) — same root cause (server omits optional prompts/list, OpenCode errors instead of treating it as empty)prompts/listandresources/listmethods #24985: MCP client fails to initialize servers that don't implement optionalprompts/listandresources/listmethods — same root cause, covers both prompts and resourcesprompts/list-32601 causes infinite npx process spawning and UI freeze — same root cause with additional cascading effects on Windows122yjs commentedon May 7, 2026
I checked this again against v1.14.40.
Results:
listPrompts()without a fallback for-32601 Method not found.context7andgrep_app.prompts/listremoved the repeatedfailed to get promptserrors again.resources/list, since MCP client fails to initialize servers that don't implement optionalprompts/listandresources/listmethods #24985 tracks the same optional-method issue for both prompts and resources.So v1.14.40 fixes the separate macOS watcher packaging issue, but it does not appear to fix this MCP optional-method compatibility issue yet.