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

Annotations already declare readOnlyHint=true, openWorldHint=false, and destructiveHint=false, so the safety profile is covered. The description adds the entitlement requirement (plan tier) and the scope of returned entities and their recency, which is exactly the kind of context annotations cannot express; it omits pagination or result-size behavior.

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 short sentences with no filler: content first, then eligibility constraint. It is tightly front-loaded and every clause carries information, though 'Intelligence plan and above' is terse enough to be slightly ambiguous about the exact tier name.

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-parameter read tool with no output schema, the description supplies the entity types, the recency dimension, and the plan gate. It lacks any indication of return shape or volume, a minor gap given annotations cover the safety and openness profile.

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 and 100% schema coverage of an empty object, so the schema cannot be improved upon. The baseline of 4 applies because there is nothing parameter-wise for the description to clarify.

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?

The description names the resource (the buyers and competitors the user watches) and the value it returns (their recent activity), which is more specific than the bare tool name. It does not explicitly differentiate itself from the sibling `watch` tool, leaving the agent to infer that this is the read side of that pair.

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?

It states an eligibility precondition ('Intelligence plan and above'), which is genuinely useful gating information. However, it offers no guidance on when to choose this over related siblings such as `watch`, `my_saved_tenders`, or `my_bids`.

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