From 4ae10a0999695dfc1e6b8485c7f108344aaa334d Mon Sep 17 00:00:00 2001
From: drknowhow <dtselenc@gmail.com>
Date: Thu, 24 Sep 2026 07:04:25 -0400
Subject: [PATCH] fix(mcp): first tool call hung on Windows while numpy loaded
 (2.149.1)

The c3-initial-index thread loaded numpy's native module through chromadb
while the server started its other threads; on Windows that deadlocked
both, and the first tool call or c3_session save never answered. The
server now imports numpy on the main thread before any background thread
starts. test_codex_mcp_transport.py: 0/10 passes before, 10/10 after on
the affected box; full suite 4607 passed.

Claude-Session: https://claude.ai/code/session_01F6QMHB2mkrDJiQWfC1g9wy
---
 CHANGELOG.md      | 13 +++++++++++++
 cli/c3.py         |  2 +-
 cli/mcp_server.py |  8 ++++++++
 pyproject.toml    |  2 +-
 4 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d932044..ff7dbc6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,19 @@ All notable changes to Code Context Control (C3) are documented here.
 The format is loosely based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.149.1] - 2026-09-24
+
+### Fixed — the first tool call could hang forever on Windows
+
+When a project's embedding index was being built, the `c3-initial-index`
+thread loaded numpy's native module (through chromadb) while the server was
+starting its other threads. On Windows that deadlocked both, and the first
+tool call, or the first `c3_session save`, never answered. The server now
+imports numpy on the main thread before any background thread starts (about
+75 ms at startup; skipped when numpy is not installed).
+`tests/test_codex_mcp_transport.py` went from 0 of 10 passes to 10 of 10 on
+the machine that showed it.
+
 ## [2.149.0] - 2026-09-24
 
 ### Added — the hub launches YOUR agent, not a command named `claude`
diff --git a/cli/c3.py b/cli/c3.py
index 30889be..cb6b6f7 100644
--- a/cli/c3.py
+++ b/cli/c3.py
@@ -91,7 +91,7 @@
 # Config
 CONFIG_DIR = ".c3"
 CONFIG_FILE = ".c3/config.json"
-__version__ = "2.149.0"
+__version__ = "2.149.1"
 
 # The PreToolUse matcher for native subagent calls (installer and hub migration).
 AGENT_MATCHER = "Agent|Task"
diff --git a/cli/mcp_server.py b/cli/mcp_server.py
index 4eec5d7..eda3d10 100644
--- a/cli/mcp_server.py
+++ b/cli/mcp_server.py
@@ -192,6 +192,14 @@ def _notify_mcp_ready(svc) -> None:
 async def lifespan(server):
     """Initialize all services, auto-start session, start file watcher."""
     project = PROJECT_PATH
+    # numpy's native module must load before any background thread exists: on
+    # Windows, loading it from c3-initial-index (via chromadb) while this
+    # process starts other threads deadlocks both, and the first tool call
+    # never answers. Absent numpy, nothing here needs it.
+    try:
+        import numpy  # noqa: F401, PLC0415
+    except ImportError:
+        pass
     services = build_runtime(project, ide_name=_IDE_NAME)
     if getattr(services, "time_tracker", None) is not None:
         try:
diff --git a/pyproject.toml b/pyproject.toml
index 55848f4..1dd2f43 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "code-context-control"
-version = "2.149.0"
+version = "2.149.1"
 description = "Local MCP code-intelligence for AI coding tools: surgical search/read/edit, agent-config version history, path-level access + masking guards, and a multi-project hub."
 readme = "README.md"
 requires-python = ">=3.10"