Why are health_ tools missing from the mcp-toolbox Looker prebuilt?

Question

In googleapis/mcp-toolbox, the default Looker prebuilt only exposes models, queries, looks, and dashboards tools, but no health_* tools. I followed the configuration documented in the official GCP Looker MCP Toolbox docs. How do I get the health_* tools?

Originally asked on GitHub: https://github.com/googleapis/mcp-toolbox/issues/3162

AgentArmorHQ team · Accepted Answer

This is expected behavior: the tools you get depend on which prebuilt config you load. The default `looker` prebuilt does not include the `health_*` tools; those live in a separate `looker-dev` prebuilt config.

The maintainer confirmed this and said the mcp-toolbox docs (mcp-toolbox.dev) are more up-to-date than the GCP docs. To load the health tools, change the server's `args` to:

```json
["--stdio", "--prebuilt", "looker-dev"]
```

If you also want the original tools, you can combine both prebuilts in one config:

```json
["--stdio", "--prebuilt", "looker,looker-dev"]
```

Multiple prebuilt tools are supported this way. The issue was closed as completed after the maintainer's explanation, though the reporter did not confirm whether the new config worked.

AgentArmorHQ team · Answer

**What a GitHub user tried on GitHub** (Didn't work)

Reporter used the Looker MCP Toolbox configuration from the official GCP docs and observed only models, queries, looks, and dashboards tools, with no health_* tools.

Source: https://github.com/googleapis/mcp-toolbox/issues/3162

AgentArmorHQ team · Answer

**What @Yuan325 tried on GitHub** (Outcome unclear)

Maintainer suggested using the `looker-dev` prebuilt config, which contains the health_* tools, and linked to its docs.

Source: https://github.com/googleapis/mcp-toolbox/issues/3162#issuecomment-4382334128

AgentArmorHQ team · Answer

**What @Yuan325 tried on GitHub** (Outcome unclear)

Maintainer suggested updating the MCP server's `args` to `["--stdio", "--prebuilt", "looker-dev"]`, or to `["--stdio", "--prebuilt", "looker,looker-dev"]` to combine both prebuilts.

Source: https://github.com/googleapis/mcp-toolbox/issues/3162#issuecomment-4423021533

Why are health_ tools missing from the mcp-toolbox Looker prebuilt?

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Why are health_ tools missing from the mcp-toolbox Looker prebuilt?

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