yuqi1129 opened a new issue, #13120:
URL: https://github.com/apache/gravitino/issues/13120
### Version
main branch
### Describe what's wrong
The MCP tool `list_tags_for_metadata` silently returns `[]` for metadata
objects that have associated tags.
`PlainRESTClientTagOperation.list_tags_for_metadata` requests
`/objects/{type}/{fullName}/tags?details=true`, whose REST response contains a
`tags` array of tag objects. It extracts `names` instead, so a successful
response falls back to an empty list. The policy equivalent correctly extracts
`policies`.
### Error message and/or stacktrace
No exception is raised. For a successful REST response containing two tag
objects in `tags`, the MCP tool returns `[]`.
### How to reproduce
1. Associate tags with a table.
2. Verify that `GET
/api/metalakes/{metalake}/objects/table/{fullName}/tags?details=true` returns
the tag objects in `tags`.
3. Call `list_tags_for_metadata` with that table's `metadata_full_name` and
`metadata_type: table`.
4. Observe `[]` instead of the tag objects, including their comments,
properties, audit information, and inheritance flags.
### Additional context
Confirmed on main at `441e590b98dba14bbd176a0660ce88cd39368476`. Regression
tests using an HTTP mock transport reproduce the issue both through the REST
client operation and an in-process MCP tool call. Both fail before changing the
extracted field from `names` to `tags` and pass afterward.
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