Claude Code / AI Coding Tools

Anthropic Claude Code MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely)

Developer using Claude Code with custom MCP tools experiences infinite hangs because server-level timeouts don't apply to individual tool invocations Includes evidence for Claude Code troubleshooting demand.

Source-backed Last updated May 23, 2026 1 source Needs local verification

Category: AI Coding Tools
Error signature: MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely)
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 23, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Claude Code, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely) is a Claude Code failure pattern reported for developers trying to developer using claude code with custom mcp tools experiences infinite hangs because server-level timeouts don't apply to individual tool invocations. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub issue #53641 (anthropics/claude-code) — recently closed (completed) May 24, labels: area:mcp, bug, has repro. While resolved, the error pattern ('stdio hangs indefinitely') represents a significant UX blocker for teams using custom MCP servers. Distinct from general timeout/rate-limit topics. Good for capturing users searching before fix ships.

Common causes

GitHub issue #53641 (anthropics/claude-code) — recently closed (completed) May 24, labels: area:mcp, bug, has repro. While resolved, the error pattern ('stdio hangs indefinitely') represents a significant UX blocker for teams using custom MCP servers. Distinct from general timeout/rate-limit topics. Good for capturing users searching before fix ships.

Quick fixes

Confirm the exact error signature matches MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely).
Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely) exactly before applying the quick fix.
Compare the failing environment with Claude Code versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely) mean in Claude Code?

MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely) indicates the workflow described by "Anthropic Claude Code MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely)" failed in a AI Coding Tools context. Start by confirming the exact signature and the component that emitted it.

What should I check first for MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely)?

Check whether this cause matches your environment: GitHub issue #53641 (anthropics/claude-code) — recently closed (completed) May 24, labels: area:mcp, bug, has repro. While resolved, the error pattern ('stdio hangs indefinitely') represents a significant UX blocker for teams using custom MCP servers. Distinct from general timeout/rate-limit topics. Good for capturing users searching before fix ships.

Is the MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely) guidance source-backed?

The "Anthropic Claude Code MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely)" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely)?

For "Anthropic Claude Code MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely)", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely)?

For "Anthropic Claude Code MCP per-server timeout not enforced on individual tool calls (stdio hangs indefinitely)", collect the failing Claude Code command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.