japrogramer opened a new issue, #39872:
URL: https://github.com/apache/superset/issues/39872
### Bug description
Here is the error from the mcp client
`MCP Server Error: failed to initialize server: failed to create client:
failed to start client: unexpected status code: 502`
and this is what is server side.
```
2026-05-05 02:38:16,370:INFO:superset.app:Configuration sync to database
completed successfully
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Superset 6.0.1
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
superset@159f336abbd3:/app$ superset mcp run --host 0.0.0.0 --port 5008
Loaded your LOCAL configuration at [/app/pythonpath/superset_config.py]
/app/.venv/lib/python3.10/site-packages/flask_limiter/extension.py:324:
UserWarning: Using the in-memory storage for tracking rate limits as no storage
was explicitly specified. This is not recommended for production use. See:
https://flask-limiter.readthedocs.io#configuring-a-storage-backend for
documentation about configuring the storage backend.
warnings.warn(
2026-05-05 02:38:54,136:INFO:alembic.runtime.migration:Context impl
SQLiteImpl.
2026-05-05 02:38:54,137:INFO:alembic.runtime.migration:Will assume
non-transactional DDL.
2026-05-05 02:38:54,464:INFO:superset.app:Syncing configuration to
database…
2026-05-05 02:38:54,473:INFO:superset.app:Configuration sync to database
completed successfully
Usage: superset [OPTIONS] COMMAND [ARGS]…
Try 'superset --help' for help.
Error: No such command ‘mcp’.
```
copied docker compose from
`https://superset.apache.org/admin-docs/configuration/mcp-server/`
```
# docker-compose.yml
services:
superset:
image: apache/superset:latest
ports:
- "8088:8088"
volumes:
- ./superset_config.py:/app/superset_config.py
environment:
- SUPERSET_CONFIG_PATH=/app/superset_config.py
mcp:
image: apache/superset:latest
command: ["superset", "mcp", "run", "--host", "0.0.0.0", "--port",
"5008"]
ports:
- "5008:5008"
volumes:
- ./superset_config.py:/app/superset_config.py
environment:
- SUPERSET_CONFIG_PATH=/app/superset_config.py
depends_on:
- superset
```
### Screenshots/recordings
_No response_
### Superset version
master / latest-dev
### Python version
3.9
### Node version
16
### Browser
Chrome
### Additional context
_No response_
### Checklist
- [ ] I have searched Superset docs and Slack and didn't find a solution to
my problem.
- [ ] I have searched the GitHub issue tracker and didn't find a similar bug
report.
- [ ] I have checked Superset's logs for errors and if I found a relevant
Python stacktrace, I included it here as text in the "additional context"
section.
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