posit-dev / posit-dev/chatlas

Allow passing env vars to stdio MCP tools

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#139 2 comments 0 reactions 0 assignees View on GitHub

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Dominant language
Python
Stars
176
Forks
28
Avg merge
18h 42m
Merged PRs (30d)
16

Description

There is not currently a way to pass environment variables to stdio MCP tools. It might be good to add an additional env parameter to the register_mcp_tools_stdio_async function to allow control of the spawned process' environment. Several tools rely on environment variables for secrets.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by locating register_mcp_tools_stdio_async and inspect how it spawns the stdio MCP process and constructs its environment. The change is complete when callers can supply an env parameter that controls the spawned process environment, including variables needed for secrets; the issue does not name a test file.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
tooling
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
55/100

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