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uv trampoline failed to spawn Python child process - Hermes Agent

Quick fix

If this Hermes detection error persists after upgrading to v3.16.1, provide reproduction details; the issue has no verified fix yet.

Symptom

Section titled “Symptom”
Error output
error: uv trampoline failed to spawn Python child process Caused by: entity not found (os error 2)；

Cause

Section titled “Cause”

The report occurred during a local environment check for the native Windows version of Hermes Agent. A maintainer suggested upgrading to v3.16.1 or later and testing again. After upgrading, the reporter confirmed that Claude Code recovered, but Hermes still showed the error, so the issue being closed does not mean the Hermes problem was fixed.

Another user suggested that an earlier “installed but cannot run” problem might involve Windows path quoting through `cmd /C`. This was not confirmed by a maintainer, and the Hermes error after the upgrade was `uv trampoline failed to spawn Python child process`. The reporter also noted that configuration was written to `~/.hermes/config.yaml`, while they believed the active configuration was at `~/AppData/Local/hermes/config.yaml`. The issue did not confirm a causal relationship or provide a verified fix.

Fix

Section titled “Fix”

  1. Confirm whether the issue is still consistently reproducible. As requested by the maintainer, add the CC Switch version, operating system, relevant application versions, current provider / routing configuration, reproduction steps, and logs or screenshots to the source issue.

Affected Versions

Section titled “Affected Versions”
ToolHermes Agent
Version3.16.1（报告仍可复现）
PlatformsWindows

Source Issues

Section titled “Source Issues”

This page is distilled from 1 real issues

FAQ

Section titled “FAQ”
Does the Hermes detection problem still occur after upgrading to v3.16.1?
Yes. The reporter said Claude Code recovered after the upgrade, but Hermes still reported `uv trampoline failed to spawn Python child process Caused by: entity not found (os error 2)`.
Does this Hermes problem reproduce on macOS?
The reporter said it did not reproduce on macOS and noted differences between Hermes 0.15.1 and 0.15.2; the thread provided no further conclusion.
Section titled “Related problems”
CC-Switch Cannot Recognize Antigravity Sessions, Token Statistics Are 0This is an unresolved feature request; no merged and verifiable solution is available yet.1 issues mergedcc-switch Usage Statistics Differ from DeepSeek Official Site / Stop UpdatingUpgrade to v3.19.2 or later, then run “Rebuild Codex Usage” once on the “Usage Statistics” page to correct historical overcounts or missing records.22 issues mergedAgents panel still retains the session entry (status shown as stale) - Claude CodeUpdate to the latest CC Switch, delete the session again, and check. If the ghost entry remains, add the version, reproduction steps, and logs, then reopen…2 issues merged

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