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MCP And PyTest Bridge Digest

Deep sources: docs/architecture/MCP/README.md, docs/architecture/Execution/pytest-bridge.md.

Two pipes

Pipe Server Use
DevToolsMcp_{Host}_{Version}_{PID} McpPipeServer MCP SDK (NDJSON)
DevTools_{Host}_{Version}_{PID} DevToolsPipeServer pytest + control (BridgeMessage)

Never mix NDJSON and BridgeMessage on one pipe.

MCP

Daemon (--stdio or Gateway) exposes infrastructure tools plus search_dynamic / invoke_dynamic. Host tools are indexed in ProcessCatalogs (not on daemon tools/list). In-host built-ins: execute_csharp_code, execute_python_code, open_document, navigate_history. See MCP/tools.md.

Paths: DevTools.Ipc, DevTools.Mcp.*, DevTools.Daemon, DevTools.Execution/External/.

PyTest (host side, this repo)

  • tests/run → PytestRunner.py (PEP 723 via the active provider — uv sidecar when the host owns CPython).
  • ipytests/run → IpyTestDriver.py (unittest, no pixi).
  • Contracts: PytestContracts.cs ↔ sibling RevitDevTool.PyTest models.py.
  • Write/run tests: .agents/skills/revit-pytest/SKILL.md.

Change checklist

  • MCP: dotnet run --project tests/DevTools.Mcp.Server.Tests/DevTools.Mcp.Server.Tests.csproj; parsers: tests/DevTools.Mcp.Catalog.Tests (build samples/McpToolsetDemo first, or tests Skip).
  • Pytest wire: sync contracts ↔ models.py; focused Execution tests (PytestRunRequestParseTests, DevToolsPipeServerTests, handlers).
  • Remaining live/opt-in and Coverlet/testhost limits: test-matrix.md Current gaps. In-host PytestRunner.py is not headless CI.