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0.16.6

modelcontextprotocol/inspector0.16.6Sep 3, 2025by cliffhall

AI Summary

This is a significant release focusing on CLI and transport improvements. It adds CLI header flags and makes CLI output awaitable, handles stderr on STDIO servers, fixes stdout buffering issues, and adds Docker container startup command instructions.

Key Highlights

  • Add CLI header flags and make CLI output awaitable
  • Handle stderr on STDIO servers
  • Fix stdout buffering issues in spawned processes
  • Setup prettier precommit

New Features

  • CLI header flags support
  • CLI output awaitability
  • Docker container startup command

Full Release Notes

## What's Changed
* Setup prettier precommit by @olaservo in https://github.com/modelcontextprotocol/inspector/pull/731
* Restore AuthDebuggerState.resource as URL by @halter73 in https://github.com/modelcontextprotocol/inspector/pull/714
* Fix/validate urls for http/https scheme only in auth flow by @jenn-newton in https://github.com/modelcontextprotocol/inspector/pull/740
* fix: Trim whitespace from Command input to prevent ENOENT by @richardkmichael in https://github.com/modelcontextprotocol/inspector/pull/719
* Handling of stderr on STDIO servers by @cliffhall in https://github.com/modelcontextprotocol/inspector/pull/741
* Add Docker container startup command to README.md by @cliffhall in https://github.com/modelcontextprotocol/inspector/pull/746
* Update CC GitHub Action to have same config as servers repo action by @olaservo in https://github.com/modelcontextprotocol/inspector/pull/728
* docs: add JSDoc documentation to utility functions by @Raghuboi in https://github.com/modelcontextprotocol/inspector/pull/697
* fix: STDIO and SSE transports need MCP_FULL_PROXY_ADDRESS by @richardkmichael in https://github.com/modelcontextprotocol/inspector/pull/708
* Parse tool args from CLI as JsonValue instead of just strings by @olaservo in https://github.com/modelcontextprotocol/inspector/pull/647
* Add support for --header flags in MCP Inspector CLI by @philfreo in https://github.com/modelcontextprotocol/inspector/pull/716
* Make cli output awaitable to prevent truncating the result by @cmgriffing in https://github.com/modelcontextprotocol/inspector/pull/754
* Fix a typo in progress notification method name by @pavan-mellamputi-socure in https://github.com/modelcontextprotocol/inspector/pull/745
* `tailwindcss-animate` should be a dev dependency by @phuctm97 in https://github.com/modelcontextprotocol/inspector/pull/703
* Add CLI header integration tests and update test scripts by @olaservo in https://github.com/modelcontextprotocol/inspector/pull/768
* fix: correct stdout buffering issues in spawned processes by @nsheaps in https://github.com/modelcontextprotocol/inspector/pull/739
* Auto log-level handling support by @cliffhall in https://github.com/modelcontextprotocol/inspector/pull/774
* Bump version to 0.16.6 by @cliffhall in https://github.com/modelcontextprotocol/inspector/pull/777

## New Contributors
* @halter73 made their first contribution in https://github.com/modelcontextprotocol/inspector/pull/714
* @jenn-newton made their first contribution in https://github.com/modelcontextprotocol/inspector/pull/740
* @Raghuboi made their first contribution in https://github.com/modelcontextprotocol/inspector/pull/697
* @philfreo made their first contribution in https://github.com/modelcontextprotocol/inspector/pull/716
* @cmgriffing made their first contribution in https://github.com/modelcontextprotocol/inspector/pull/754
* @pavan-mellamputi-socure made their first contribution in https://github.com/modelcontextprotocol/inspector/pull/745
* @phuctm97 made their first contribution in https://github.com/modelcontextprotocol/inspector/pull/703
* @nsheaps made their first contribution in https://github.com/modelcontextprotocol/inspector/pull/739

**Full Changelog**: https://github.com/modelcontextprotocol/inspector/compare/0.16.5...0.16.6