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

Annotations already declare readOnly, idempotent, non-destructive, open-world, so safety is covered. The description still adds genuinely new behavior: the render is capped at the first twenty undecided items, it renders as an interactive widget in a chat client, and it costs roughly 3440 tokens. It does not say what happens to items already seen or how a decision gets recorded (monitor_decide), which keeps it off a 5.

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?

Labeled Purpose/When/Cost structure is front-loaded and every clause carries information the agent uses: what it does, when to pick it, and the cost of the call. No filler.

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 definition covers render target, item count and cost for a single-parameter read tool. Minor gap: it doesn't indicate the follow-up flow (deciding on the postings shown) via monitor_decide.

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?

Only one parameter and schema description coverage is 100%, with the schema pointing to monitor_list for sourcing the id. The description adds no syntax or format detail beyond the schema, so baseline 3 applies.

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 resource (a monitor's first twenty undecided postings), plus the scope limits and target surface (interactive list in a chat app). It explicitly names the two siblings it is not, so an agent can route correctly without opening the 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?

The dedicated "When" sentence gives the triggering user intent (going through what a monitor collected) and explicitly contrasts monitor_get (counts) and job_postings_search_widget_render (search postings). When-to-use and alternatives are both spelled out.

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