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

Read-only annotations cover the safety profile, and the description adds real context beyond them: data is sourced from named 10-K filings, competitors whose own 10-K is unread are flagged (and why), and the tool is gated behind the Pro plan.

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?

Dense but front-loaded: the core output is stated first, then modes, then caveats, then plan gating. Slightly packed into one long sentence, but no wasted clauses.

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-shape burden and does so adequately (per-entity competitor groupings, vs mode breakdown, unread-competitor marking). A little more on result ordering or maxResults interaction would make it complete.

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 coverage is 100% so baseline is 3, but the description adds meaning beyond the schema by explaining the 'vs' output shape (both / only the company / only the competitor) and the default-all behavior, which the schema only gestures at.

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 (get which suppliers/customers overlap with competitors' supply chains) and names the differentiating condition versus its sibling GetSupplyChain, which merely lists the chain. An agent can distinguish the two without opening schemas.

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?

Explains the two usage modes (all competitors by default, single-competitor comparison via 'vs') and discloses the Pro plan prerequisite. It does not explicitly say when to prefer this over GetSupplyChain, but the overlap framing makes the context clear.

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