Fix homeassistant MCP sidecar command in Helm chart #27

New Issue

2026-02-21T17:16:28Z

cpfarhood commented

2026-02-21 17:16:28 +00:00

(Migrated from github.com)

Problem

The homeassistant MCP sidecar in the devcontainer Helm chart (v0.2.2) is using an incorrect fastmcp command that causes the container to crash with:

[02/21/26 17:02:34] ERROR    File not found: /app/ha_mcp.main   filesystem.py:68

Current Configuration

The chart currently generates this command for the homeassistant-mcp container:

command: ["fastmcp", "run", "ha_mcp.main:app", "--transport", "sse", "--host", "0.0.0.0", "--port", "8087"]

Required Fix

The command should be:

command: ["fastmcp", "run", "--transport", "sse", "--host", "0.0.0.0", "--port", "8087"]

The ha-mcp container image (ghcr.io/homeassistant-ai/ha-mcp:stable) includes a fastmcp.json configuration file that specifies the correct module path:

{
  "$schema": "https://gofastmcp.com/public/schemas/fastmcp.json/v1.json",
  "source": {
    "path": "src/ha_mcp/__main__.py",
    "entrypoint": "mcp"
  }
}

When fastmcp run is executed without specifying a module, it uses this configuration file automatically.

Temporary Workaround

Currently patched directly in the deployment:

kubectl patch deployment devcontainer-homeassistant -n cpfarhood --type='json' \
  -p='[{"op": "replace", "path": "/spec/template/spec/containers/3/command", \
  "value": ["fastmcp", "run", "--transport", "sse", "--host", "0.0.0.0", "--port", "8087"]}]'

Action Required

Update the devcontainer Helm chart template for the homeassistant MCP sidecar to use the correct command.

Additional Notes

The secret keys for Home Assistant URL and token should be lowercase with dashes: homeassistant-url and homeassistant-token
The container requires HOMEASSISTANT_URL and HOMEASSISTANT_TOKEN environment variables to be set

Related Context

Kubernetes deployment: cpfarhood/kubernetes repository
Issue initially tracked as cpfarhood/kubernetes#105 (moved here for proper tracking)

## Problem The `homeassistant` MCP sidecar in the devcontainer Helm chart (v0.2.2) is using an incorrect `fastmcp` command that causes the container to crash with: ``` [02/21/26 17:02:34] ERROR File not found: /app/ha_mcp.main filesystem.py:68 ``` ## Current Configuration The chart currently generates this command for the homeassistant-mcp container: ```yaml command: ["fastmcp", "run", "ha_mcp.main:app", "--transport", "sse", "--host", "0.0.0.0", "--port", "8087"] ``` ## Required Fix The command should be: ```yaml command: ["fastmcp", "run", "--transport", "sse", "--host", "0.0.0.0", "--port", "8087"] ``` The `ha-mcp` container image (`ghcr.io/homeassistant-ai/ha-mcp:stable`) includes a `fastmcp.json` configuration file that specifies the correct module path: ```json { "$schema": "https://gofastmcp.com/public/schemas/fastmcp.json/v1.json", "source": { "path": "src/ha_mcp/__main__.py", "entrypoint": "mcp" } } ``` When `fastmcp run` is executed without specifying a module, it uses this configuration file automatically. ## Temporary Workaround Currently patched directly in the deployment: ```bash kubectl patch deployment devcontainer-homeassistant -n cpfarhood --type='json' \ -p='[{"op": "replace", "path": "/spec/template/spec/containers/3/command", \ "value": ["fastmcp", "run", "--transport", "sse", "--host", "0.0.0.0", "--port", "8087"]}]' ``` ## Action Required Update the devcontainer Helm chart template for the homeassistant MCP sidecar to use the correct command. ## Additional Notes - The secret keys for Home Assistant URL and token should be lowercase with dashes: `homeassistant-url` and `homeassistant-token` - The container requires `HOMEASSISTANT_URL` and `HOMEASSISTANT_TOKEN` environment variables to be set ## Related Context - Kubernetes deployment: `cpfarhood/kubernetes` repository - Issue initially tracked as cpfarhood/kubernetes#105 (moved here for proper tracking)

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Reference: farhoodlabs/devcontainer#27