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

Annotations already declare readOnly, idempotent, and closed-world, so the safety profile is covered. The description adds genuine non-annotation context: the payload is verbatim ('no generated prose') and failure modes are explicit ('missing text or failed receipt returns an error'), which is more than the annotations convey.

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?

Four short sentences, front-loaded with the action and the returned fields, then constraints, then the sibling redirect. No sentence is filler; even the terse 'clock and quality receipt' phrasing is load-bearing output description.

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?

With no output schema, the description carries the return-value burden and does so by naming each field. Error behavior is covered. Minor gap: 'clock and quality receipt' are domain terms not explained, so an agent knows they exist but not their shape.

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?

There are zero parameters, so no per-parameter semantics are needed; the description simply and correctly confirms 'No arguments.' Baseline 4 is appropriate for a no-arg tool with 100% schema coverage.

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 and resource ('Read the latest published editorial') and enumerates exactly what comes back: title, full text, URL, clock, quality receipt. It also names the sibling it is not for ('liquidity_tiers for board data'), so an agent can route 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?

'No arguments' tells the agent the call takes no configuration, and the alternative 'Use liquidity_tiers for board data' gives an explicit redirect. It stops short of a full when/when-not framing, since 'board data' is the only stated distinction from siblings beyond the returned payload.

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