Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnly, idempotent, closed-world, and non-destructive behavior, so the safety profile is covered. The description adds some useful context — a taxonomy of free vs. signed tools and the note that entries are callable by name — but leaves a major behavioral question unanswered: what 'signed' implies (auth, signature, rate limits) and whether this call has side effects beyond reading.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single compact sentence with the broadest category ('free house tools') front-loaded and the parenthetical examples doing efficient work. The trailing '(callable by name)' is a dangling fragment that would read better attached to a stated verb.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

There is no output schema, so the description must carry the burden of describing what comes back. 'With their endpoints' only partially does so — it is unclear whether the return is a name list, endpoint URLs, full call signatures, or tool schemas — which matters for a discovery tool feeding subsequent calls.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool takes zero parameters and the schema is fully closed (additionalProperties: false), so there is nothing for the description to disambiguate. Baseline 4 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the content categories ('free house tools' such as weather, FX, time, news, plus 'advanced signed tools and legacy aliases') but never states a verb or the operation — it is unclear whether the tool lists a catalog, returns endpoint metadata, or proxies calls. It is distinguishable from siblings like find_capability by its breadth, but the actual purpose remains implied rather than stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no indication of when to use this instead of siblings such as find_capability, list_my_toolbox, or check_reliability. The parenthetical 'callable by name' hints at a discovery-then-invoke flow but does not state when an agent should reach for this catalog.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.