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

Annotations already cover the safety profile (readOnlyHint=true, destructiveHint=false, openWorldHint=false), so the bar is lower. The description adds useful non-schema context: it is 'cheap and self-contained — no doc lookup needed,' which tells the agent it can call it freely without first resolving a document ID.

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 sentences, both front-loaded and purposeful: the first states what is returned, the second states when to call it and its cost profile. No filler or restated boilerplate.

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, no-output-schema discovery tool with full annotation coverage, the definition supplies everything an agent needs to call it correctly, including the self-contained/cheap behavioral note. The only marginal gap is a slightly vague 'grouped overview' return shape, which is acceptable given no output schema exists.

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, which per the rubric is a baseline 4. The description correctly implies no inputs are required, consistent with the empty schema and additionalProperties=false.

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 ('show') and a specific resource ('a grouped overview of everything docfarm can do'), then enumerates the capability domains (reading, editing, sharing, tracking, drafting follow-ups, collaborating). This is unmistakable against siblings like get_doc_status or list_docs, which are concrete data tools rather than capability discovery.

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?

Explicitly lists the trigger utterances ('what can you do?', 'what does docfarm do?', 'show me what's possible', 'help') and ties invocation to them. Nothing is left to inference about when to reach for this tool over the sibling document operations.

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