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Reported issues for mcptoon

Pod holds 5 of 5 GitHub reports that passed its relevance review. This can include external user reports, maintainer-confirmed bugs, and concrete feature gaps. Treat them as evidence to inspect, not a count of distinct defects.

Back to mcptoon.

Most discussed

[FEATURE] HTTP MCP install with environment-sourced Headers

Problem

mcptoon add <name> --http <url> --header ... can configure a remote MCP server with a literal HTTP Header. For users who want the one-command mcptoon install <name> --url <url> flow, install_http initializes the client without Headers, and its [generated…

Read the thread · 2026-09-25 · closed · external user · 3 comments

🐛 fix(native): mcptoon_health emits uptimeSeconds: -0.0, which fails strict JSON lossless checks in clients

Problem

mcptoon_health is rejected by MCP clients that validate whether a tool result survives a JSON round trip. With DSH (DeepSeek Harness) as the client every call fails:

tool "mcptoon_health" returned invalid output: value is not lossless JSON

The sibling native tools work in the same session — mcptoon_servers, mcptoon_manifest and mcptoon_usage all return normally — so the gateway itself is healthy.

Environment

Read the thread · 2026-09-25 · closed · external user · 2 comments

[bug] serve drops structuredContent (uses call() instead of call_full()) while tools/list still advertises outputSchema — strict MCP clients reject the response

Summary

mcptoon serve advertises each tool's outputSchema in tools/list, but builds the tools/call response with MCPClientPool.call(), which unwraps structuredContent away. Per MCP spec, a tool that declares an outputSchema MUST return structuredContent — so strict clients reject every result of those tools, even though the upstream server behaved correctly.

Root cause (4 places, all in src/mcptoon/)

**1. client.py:915-930 — _extract_content() unwraps the…

Read the thread · 2026-09-25 · closed · external user · 2 comments

[BUG] mcptoon health fails for HTTP transport

Describe the bug

mcptoon health fails when checking servers configured with an http transport because src/mcptoon/health.py constructs the client as MCPClient(http_url=url, headers=headers, timeout=timeout), but MCPClient does not accept an http_url parameter. As a result, the health command breaks whenever any HTTP servers are configured.…

Read the thread · 2026-09-10 · closed · external user · 2 comments

spec="auto" deadlocks legacy stdio servers whose probe output fills the unread stderr pipe

Summary

Any stdio server that writes more than one pipe buffer (~4 KB) to stderr while handling the spec="auto" probe will deadlock. It blocks writing to stderr, so it never answers server/discover — and then never answers the legacy initialize fallback either. From the user's side it looks like the server "went silent" (RESPONSE_TIMEOUT).

spec="legacy" avoids it, because the probe (and its stderr spam) never happens.

Root cause

_spawn_stdio() opens the child with…

Read the thread · 2026-09-17 · closed · 0 comments

Most recent

The remaining reports are on the project's issue tracker.