This directory contains a minimal stdio MCP server for local testing.

• Tools:
  • calculator_add: adds two numbers. Inputs: a (number), b (number).
  • print_envs: returns all environment variables visible to the server as pretty JSON.

• Node 20+ (same as the repo engines)
• Uses the repo dependency @modelcontextprotocol/sdk and zod

• Via Node:

  node testing/fake-stdio-mcp-server.mjs

• Via script (adds a stable entrypoint path):

  testing/run-fake-stdio-mcp-server.sh

Environment variables provided when launching (either from your shell or by the app) will be visible to the print_envs tool.

export FOO=bar
export SECRET_TOKEN=example
testing/run-fake-stdio-mcp-server.sh

When adding a stdio MCP server in the app, use:

• Command: testing/run-fake-stdio-mcp-server.sh (absolute path recommended)
• Transport: stdio
• Args: leave empty (not required)
• Env: optional key/values (e.g., FOO=bar)

Once connected, you should see the two tools listed:

• calculator_add
• print_envs