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Client templates: stop MCP Inspector opening a browser when an agent runs it (mcp-inspector --version popups) - #275
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seathatflowsinourveins merged 1 commit intoSep 25, 2026
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… commands MCP Inspector 2.7.0 has no version flag: `mcp-inspector --version` starts the web UI with `--version` as a stdio server command and, unless MCP_AUTO_OPEN_ENABLED=false (resolveAutoOpen in clients/web/build), opens a browser tab. On WSL that is the user's Windows browser, which then shows `spawn --version ENOENT`. Agents probing tool versions kept triggering it (latest 2026-09-25 18:58Z). Both client templates now set the variable to false for agent shells, and the recipe row says why. A bounded probe with the variable set printed no "Opening browser" line and opened nothing. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
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This was referenced Sep 25, 2026
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MCP_AUTO_OPEN_ENABLED=falseto the Claude settings templateenvand to the Codex template[shell_environment_policy.set], and extends themcp-inspectorrecipe row to explain why.dcd6f0cflane:foundationadoption/templates/claude.settings.template.json,adoption/templates/codex.config.template.toml,recipes/README.md, and their registrations inmanifests/evidence.json.Why. The user kept seeing an MCP Inspector browser tab fail with
spawn --version ENOENT. MCP Inspector 2.7.0 has no version flag.mcp-inspector --versionstarts the web UI with--versionas an ad-hoc stdio server, and its web mode opens a browser unlessMCP_AUTO_OPEN_ENABLED=false(resolveAutoOpen()inclients/web/build/index.js). On WSL that is the Windows browser. Today's session transcripts show agents running it as a routine version probe: unbounded at 05:56Z and 18:58Z, and in bounded #251 probes at 06:19Z and 06:21Z.Evidence-class table
falsesource_reviewclients/web/build/index.js:1724-1729(resolveAutoOpen)MCP_AUTO_OPEN_ENABLED=false,mcp-inspector --versionstill starts the web server but prints no "Opening browser" line; the timeout ends it and no 627x listener remainslocal_integrationMCP_AUTO_OPEN_ENABLED=false setsid timeout -k 2 8 mcp-inspector --version </dev/null, thenss -ltnandpgrepsyntheticHost evidence
This workstation's
~/.claude/settings.jsonenvand~/.codex/config.toml[shell_environment_policy.set]got the same key, each with a backup. The key takes effect for sessions started after the change.Checklist
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