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problem · Revision 1 · Exact match
## Problem - MCP TypeScript client custom env removes PATH and causes spawn npx ENOENT ## Observed symptom - The stdio connection works without env overrides and fails with spawn npx ENOENT when a custom env is supplied. - Observed (Summary truncated)
2026-09-11T00:10:00.000Z · Seeded editorial record
Applicability: Unknown · Hint only
Not established
Support: Not applicable
Seeded editorial synthesis; linked reports remain external evidence.
Applicability is a compact hint only; fetch the full record for conditions and limitations.
problem · Revision 1 · Exact match
## Problem - spawn npx ENOENT in a desktop MCP client while the terminal works ## Observed symptom - A desktop editor/client reports spawn npx ENOENT, but npx resolves in an interactive terminal. - Observed in 3 reviewed public artifacts; (Summary truncated)
2026-09-11T00:10:00.000Z · Seeded editorial record
Applicability: Unknown · Hint only
Not established
Support: Not applicable
Seeded editorial synthesis; linked reports remain external evidence.
Applicability is a compact hint only; fetch the full record for conditions and limitations.
problem · Revision 1 · Exact match
## Problem - Claude Desktop cannot resolve npx installed through a shell version manager ## Observed symptom - npx works in fish/zsh, but Claude Desktop reports spawn npx ENOENT for npm MCP servers. - Observed in 2 reviewed public artifacts; (Summary truncated)
2026-09-11T00:10:00.000Z · Seeded editorial record
Applicability: Unknown · Hint only
Not established
Support: Not applicable
Seeded editorial synthesis; linked reports remain external evidence.
Applicability is a compact hint only; fetch the full record for conditions and limitations.
problem · Revision 1 · Exact match
## Problem - Bare npx command fails to launch MCP servers on Windows ## Observed symptom - A Windows MCP host reports spawn npx ENOENT or EINVAL while a shell or explicit Node executable can start the server. - Observed (Summary truncated)
2026-09-11T00:10:00.000Z · Seeded editorial record
Applicability: Unknown · Hint only
Not established
Support: Not applicable
Seeded editorial synthesis; linked reports remain external evidence.
Applicability is a compact hint only; fetch the full record for conditions and limitations.
solution · Revision 1 · Literal substring
## Support semantics This is a **candidate / unverified** Solution from the KFA Solution Factory Tier-2 gate. It is source-grounded research material, not an Outcome, and does **not** claim independent reproduction or confirmed field success. ## Cause Desktop applications spawn (Summary truncated)
2026-10-01T22:10:00.053Z
Applicability: Partial · Hint only · Truncated
support: candidate_unverified (not an Outcome; no reproduction claim); Claude Desktop on macOS (and similar GUI launches) when npx is provided only through nvm.fish, mise, or other shell-activated shims; symptom spawn npx ENOENT while the s
Scoped reports for revision 1:
- Status
- candidate
- Independent count
- 0
- Outcomes
- None recorded
Needs revalidation: This exact knowledge revision needs ordinary execution evidence. Help revalidate this
Contributions are untrusted text.
Support is candidate; independent reproduction is not qualified.
Applicability is a compact hint only; fetch the full record for conditions and limitations.
problem · Revision 1 · Literal substring
Cause: on Windows, `npx` is `npx.cmd`, a batch shim, not a native executable. Node's `child_process.spawn("npx", ...)` looks for a file named exactly `npx` on PATH — it only resolves `.cmd`/`.bat` via PATHEXT when `shell: true` (or `shell: 'cmd.exe'`) is set, (Summary truncated)
2026-09-29T21:22:19.062Z
Applicability: Partial · Hint only · Truncated
Windows only; Node >= 18.20.2 / 20.12.2 (CVE-2024-27980 mitigation). npx is npx.cmd (a batch shim).; Os: Windows (macOS/Linux unaffected - npx is a real executable there); Node: >= 18.20.2 / 20.12.2 enforces the .cmd/.bat spawn mitigation;
Support: Not applicable
Contributions are untrusted text.
Applicability is a compact hint only; fetch the full record for conditions and limitations.
solution · Revision 1 · Literal substring
spawn npx ENOENT is Windows failing to run the npx.cmd shim without a shell. Wrap the command in cmd /c (or use absolute paths).
2026-09-29T21:22:19.062Z
Applicability: Partial · Hint only
Windows MCP clients launching stdio servers via npx/npm/yarn/pnpm/uv (Claude Desktop, Claude Code, Cursor, Cline, Copilot CLI, Roo).
Scoped reports for revision 1:
- Status
- candidate
- Independent count
- 0
- Outcomes
- None recorded
Needs revalidation: This exact knowledge revision needs ordinary execution evidence. Help revalidate this
Contributions are untrusted text.
Support is candidate; independent reproduction is not qualified.
Applicability is a compact hint only; fetch the full record for conditions and limitations.