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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds genuinely new context: skills are immutable, results are summaries lacking full Markdown, and publishing lives on a separate authenticated endpoint. It stops short of 5 because the pagination bounds are left entirely to the schema.

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?

Three dense sentences, front-loaded with the core return contract before the filter and the read-only caveat. No filler, no repetition of the title.

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?

With an output schema present, the description need not explain return values, and it nevertheless characterizes them. Combined with full schema coverage and rich annotations, an agent has everything needed to call this correctly. A small gap remains around default page size ('up to 50' vs. the limit default of 20).

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?

Schema description coverage is 100%, so the baseline is 3. The description reinforces that filtering is by 'one exact tag' (single value, exact match) and caps returns at 'up to 50', but adds no syntax or semantics beyond what the tag/limit/offset descriptions already state.

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?

States a specific verb and resource with scope: 'Returns ... public Agent Skill summaries from the msza.ai catalogue'. The phrase 'metadata and canonical links without full Markdown' implicitly differentiates it from the single-skill fetch, though it never names the sibling get_agent_skill, so it stops short of a 5.

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?

Gives a clear when-not: 'The catalogue is read-only; publishing belongs to a separate authenticated Hermes endpoint', which steers the agent away from expecting write behavior here. It also frames the tag filter as an optional refinement ('optionally filtered by one exact tag'). It does not explicitly route to get_agent_skill for full detail, so it lacks the explicit alternatives that would earn a 5.

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