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

With no annotations, the description carries the full burden and does well: it discloses the privilege requirement (admin secret), the mutation (marks fulfilled), and the downstream effect (stored text is served by get_briefing). It omits idempotency and failure behavior, keeping it out of 5 territory.

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 with the access restriction front-loaded and zero filler; every clause adds distinct information (auth, mutation, side effect).

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?

An output schema exists so return values need no explanation, and the description covers auth, mutation, and the consumer relationship. Only edge-case behavior for invalid or unpaid requests is unaddressed.

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?

Schema description coverage is 0%, so the description must compensate. It clarifies that briefing includes sources and that admin_secret is a secret credential, but request_id semantics (who issues it, format) are left entirely to inference.

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: marks a paid request fulfilled and stores the completed briefing. It also names the sibling that consumes the result (get_briefing serves it), so an agent can separate this write-side tool from the read-side one without opening any schema.

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?

'Admin only' and 'Requires the admin secret' set clear preconditions for invocation, and the get_briefing reference implies the fulfillment workflow. It stops short of stating when NOT to use it or what to do if the request is unpaid, so it is clear context rather than full routing guidance.

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