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

The readOnlyHint annotation already establishes the safety profile, so the description is not the sole source of behavioral information. It adds that results are unfiltered and must be client-side filtered, but says nothing about result size, pagination, or ordering; the output schema covers the return shape.

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?

Two short sentences, front-loaded with the core action. The second sentence is slightly vague ('based on user requirements') and comes close to filler, but it does convey the no-filter design.

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?

For a zero-parameter read-only list tool with an output schema and readOnlyHint, the description covers what is returned ('with their details') and how to handle results, which is enough to call it correctly. Only sibling differentiation is missing.

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?

With zero parameters there is nothing to disambiguate, and the schema coverage is 100%, so the baseline of 4 applies. The mention of client-side filtering is consistent with the absence of filter parameters rather than adding new semantics.

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 states a specific verb and resource — 'List all available service catalog repositories' — which is clearly distinct from siblings like CYCLOID_BLUEPRINT_LIST or CYCLOID_COMPONENT_LIST. It does not explicitly name or contrast those siblings, but the resource noun does the disambiguation work.

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?

'The LLM can filter the results based on user requirements' hints that the tool returns an unfiltered set and the caller must narrow it, which is a useful usage cue for a zero-parameter tool. However, it never states when to prefer this over sibling list tools such as BLUEPRINT_LIST or COMPONENT_LIST, so usage is only implied.

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