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

Annotations already declare readOnlyHint, idempotentHint, and closed-world behavior, so the safety profile is covered. The description adds genuine context beyond that: the return is one markdown document and it is comprehensive, so no further tool calls are required. It stops short of describing size or structure of the document.

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 short sentences, front-loaded with the concrete identity of the content ('Who Luiz is'). The decorative list ('the paper on the whiteboard, the shelf') is atmospheric rather than informative, a minor cost, but the description is still well under the length where trimming matters.

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 no-parameter, read-only tool with no output schema, the description supplies what an agent needs: what comes back (one markdown document), how complete it is, and that no other fetch is required. Only the document's size/format beyond 'markdown' is left unstated, which is a minor gap.

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 no parameters, so there is nothing for the description to clarify and the baseline of 4 applies. The description does not need to compensate for any schema gap.

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 resource concretely: a single markdown document containing Luiz's experience, stack, and certifications. It is distinguishable from siblings like leave_message or pet_the_dog, and the closing 'read this first; there is nothing else to fetch' hints it supersedes root_whoami, though that sibling is never named. The metaphors ('the paper on the whiteboard, the shelf') add flavor without adding specificity.

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?

'Read this first; there is nothing else to fetch' is an explicit usage directive that tells the agent when to call this and that no follow-up fetch is needed. It does not name alternative siblings or describe an exclusion case, but for a zero-param profile read tool the guidance is clear and actionable.

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