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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the 'public' qualifier and specifies the resource being read, which provides minor extra context. However, it does not disclose what happens on failure, whether authentication is required, or the format of the returned manifest, so it only meets the baseline for a read-only, non-destructive operation.

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?

The description is a single sentence that is front-loaded with the verb 'Read' and the resource. There is no superfluous information, and it is appropriate for a tool with no parameters. It achieves maximum conciseness while conveying the core purpose.

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?

Given the tool has no parameters and no output schema, the description is the sole source of information about the return value. It states what is read ('manifest' and 'current capabilities') but does not describe the structure, format, or any edges like error conditions or pagination. For a simple status tool, this is minimally sufficient but leaves ambiguity about the exact response shape, so it is not fully complete.

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 has zero parameters, and the schema is trivially covered at 100% since it's an empty object. Per the rubric, a baseline of 4 applies when there are no parameters, and the description does not need to add parameter meaning. The description's mention of 'manifest and capabilities' hints at the conceptual output but is not parameter-specific.

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 clearly states the action ('Read') and the resource ('the public Daystruct manifest and current capabilities'). It distinguishes from a generic status check by specifying 'public' and 'capabilities'. However, it does not explicitly differentiate from the sibling tool 'discover_daystruct_capabilities', which may overlap in purpose, so it loses one point.

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 guidance on when to use this tool versus alternatives like 'discover_daystruct_capabilities' or 'answer_software_questions'. The description provides no context for selecting it over siblings, leaving the agent to infer the appropriate usage scenario.

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