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

Annotations already cover readOnlyHint, idempotentHint, and destructiveHint=false; the description adds context beyond them: 'No key, no account, no OAuth, no session to open first,' 'nothing is fetched to build it, and no URL of yours is touched,' and that every fact is computed from the agent's own headers and already-published files. This gives a complete prerequisite and side-effect profile consistent with the annotations.

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 clear weak dimension. One run-on paragraph that repeats itself: 'nothing for you to invent' appears twice, the exact request body is given twice, and the sibling inventory duplicats the sibling-tools context signal. The hardcoded endpoint URL and prenthetical sibling names add length without adding decision value, and the example at the end restates the opening.

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-argument, annotation-covered tool with an output schema, everything needed is present: exact call body, return shape ('a single log line... the triage row... and the same rollup triage_log returns'), auth profile, side-effect profile, and sibling routing. Short of the sibling enumeration not matching the full provided sibling list exactly, nothing an agent needs to call it correctly 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 0 parameters the baseline is 4. The description goes further: it embeds the exact request body, repeats that arguments must be empty ('nothing to fill in'), and warns 'no argument to invent' — genuinely useful for a zero-arg tool an agent might otherwise fabricate arguments for. Schema coverage is 100% but the description adds the copy-pasteable call.

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+resource+output: triaging 'your own request' into 'one line of an access log' with crawler identification from user-agent, operator, category, and address verification. Explicitly distinguishes itself from siblings: 'it is the only one whose subject is the request you just sent.' The purpose is precise even though it sits mid-paragraph.

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 explicit when-to-use direction: 'THIS IS THE CALL TO MAKE FIRST on this server:' followed by the reason ('there is nothing to look up and no argument to invent'). Names the six sibling endpoints and the whoami escape hatch ('answered by all seven and is never an error'), giving the agent a concrete decision procedure. This is exemplary routing guidance.

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