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MCP Stdio MCP Server

Stdio-to-HTTP gateway — connects MCP clients to remote HTTP MCP servers

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

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Connect

Published as mcp-stdio on pypi. Runs locally.

Known issues

72 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.

Most discussed

Design: dual-mode Streamable HTTP for the MCP 2026-07-28 draft revision (stateless transport, SEP-2575)

Summary

The next MCP spec revision — draft dated 2026-07-28 — rewrites the Streamable HTTP transport into a stateless, per-request-metadata model (draft changelog). Most of the changes land squarely on gateway code paths. This issue captures the design for supporting both the current revision (2025-11-25, sessioned) and the draft revision (stateless) side by side.

**Revised — see [the design revision comment](https://git

Read the thread · 2026-07-01 · closed · 26 comments

Firestore token store: revoked-family tokens can be resurrected by a stale concurrent writer (residual to #406)

Summary

While implementing the #406 fix (union-merge inside a Firestore transaction for --token-store-firestore's blind-overwrite race), I audited every place that removes an entry from one of _OAuthProvider's six in-memory stores (src/mcp_stdio/server.py). Two categories exist:

  1. Expiry-driven deletes (_gc_locked, the lazy expiry check in _live_entry, the expired-token branch of _token_refresh) — safe to resurrect via merge, because expiry is re-checked independently on ev

Read the thread · 2026-08-23 · closed · 3 comments

Phase 3.5-C′: modern pool polish (reaper, --modern-only, advisories, docs truth-up)

Phase 3.5-C′ per the #270 Phase 3 Re-scope (pool polish + carried advisories).

Scope

Read the thread · 2026-07-31 · closed · 3 comments

Phase 3.5-E: reverse MRTR bridge (child-initiated sampling/elicitation/roots on the modern face)

Phase 3.5-E per the #270 Phase 3 Re-scope (deferred from Phase 3 by decision D4).

Scope

The reverse MRTR bridge: a pooled legacy child's server-initiated sampling/elicitation/roots requests, translated to InputRequiredResult + client retry on the modern face — the mirror of the relay's Phase 2 PR C.

Read the thread · 2026-07-31 · closed · 3 comments

Phase 3.5-D: serve-side subscriptions/listen (modern notification channel)

Phase 3.5-D per the #270 Phase 3 Re-scope (deferred from Phase 3 by decision D4 — not required by AC1/AC2/AC4).

Scope

Serve-side subscriptions/listen: the modern face's notification channel, mirroring what the relay's client side consumes (Phase 2 PR A).

Read the thread · 2026-07-31 · closed · 3 comments

Most recent

Firestore token store: cap-eviction and client-recycling resurrection (residual to #428)

Summary

Follow-up to #406/#428/#429: while adding per-token tombstones for _revoke_family_locked (#428, closing the security-relevant residual — a family-wide revocation is now protected the same way an individual rotation/code-redemption already was), two lower-severity bare-delete paths were deliberately left out to keep that fix focused:

  1. Cap-based eviction (_evict_to_capacity_locked, called from _issue() on access/refresh/consumed_codes/consumed_refresh/`consumed_acc

Read the thread · 2026-08-23 · open · 1 comment

OAuth HTTP traffic (oauth.py, cli.py) is not covered by --max-message-size

Background

PR #417 (--max-message-size, closing #416) bounds unbounded response reads in relay.py's MCP JSON-RPC traffic and serve.py's incoming request body. /code-review medium on that PR found the same CWE-770 class is still open on a different code path: the OAuth HTTP client traffic never goes through _read_bounded/_iter_text_bounded or gets the Accept-Encoding: identity default.

Concretely, unbounded (buffered client.get()/client.post()) reads remain in:

Read the thread · 2026-08-22 · closed · 0 comments

Support bounded (zip-bomb-resistant) decompression for --max-message-size

Background

PR #417 (--max-message-size, closing #416) bounds how much of an upstream response relay buffers before parsing, and how large a request body serve accepts. During review, ai-review flagged that the cap can be bypassed: httpx.Client() advertises Accept-Encoding: gzip, deflate by default, and resp.iter_bytes()/resp.iter_text() transparently decompress a Content-Encoding-compressed response before the byte count is

Read the thread · 2026-08-22 · closed · 0 comments

Unbounded response/request body reads can OOM the gateway (relay + serve)

Problem

Neither direction of the gateway bounds the size of a message it reads into memory before parsing:

Read the thread · 2026-08-22 · closed · 0 comments

test_poison_cancel_lines_log_once fails on CPython 3.14.7 (passed on 3.14.6)

Symptom

tests/test_relay.py::TestRunModernStdinHandoff::test_poison_cancel_lines_log_once fails on the test (ubuntu-latest, 3.14) job:

FAILED tests/test_relay.py::TestRunModernStdinHandoff::test_poison_cancel_lines_log_once
  - AssertionError: assert 0 == 1
1 failed, 1941 passed

The assertion is err.count("cancel detection failed") == 1, and it gets 0 — the failure path never fires at all, so nothing is logged.

Root cause: a CPython patch bump, not a code change

The runn

Read the thread · 2026-08-13 · closed · 0 comments

--token-store-firestore: blind overwrite races during Cloud Run instance overlap

Context

`--token-store-firestore`'s own `--help` text documents "no lock against two processes sharing one document -- safe ONLY when exactly one serve process ever writes to a given document at a time." A caller can approximate that with Cloud Run's `min/max-instances=1`, but that setting only bounds concurrent instances of a single revision -- it does not prevent the outgoing and incoming instance from running simultaneously during Cloud Run's normal instance lifecycle (a redeploy'

Read the thread · 2026-08-09 · closed · 1 comment

ci(docs): PR runs can evict a queued Pages deployment (shared concurrency group)

Found by AI review on shigechika/zapi-mcp#54, where docs.yml was copied verbatim from here. The template is the right place to fix it.

Problem

docs.yml declares the concurrency group at workflow level:

on:
  push:
    branches: [main]
    paths: [...]
  pull_request:
    paths: [...]

concurrency:
  group: pages
  cancel-in-progress: false

Both event types share the group pages. GitHub keeps only one pending run per group — a newly queued run replaces the previously

Read the thread · 2026-08-06 · closed · 0 comments

See all 19 reports Pod holds for MCP Stdio — of 72 qualified upstream.

Firsthand observations

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