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

Annotations already cover safety (readOnlyHint=false, destructiveHint=false, idempotentHint=true, openWorldHint=true), and the description adds genuinely useful context beyond them: it is a paid x402 call costing 0.05 USDC and requires an X-Bazaar-Key header. It stops short of describing billing failure behavior or the report's structure.

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 compact sentences with the cost/auth marker front-loaded and the metric chain densely packed. The bracketed payment prefix is slightly cryptic in wording but earns its place by signaling cost before the agent commits.

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 burden of explaining what comes back, and it only lists metric names plus a sample URL rather than the report shape or which inputs are actually needed. readOnlyHint=false is also left unexplained for what reads as an analytical tool.

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 coverage is 100%, so the schema fully documents starting_arr_usd. The description adds no format or unit guidance beyond what the schema already states, so the 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+resource (composite 7-check SaaS financial scorecard) and enumerates the exact metrics chained, which unambiguously separates it from the single-metric sibling saas_rule_of_40_calc. An agent can pick it 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?

Usage is only implied: the phrase 'composite 7-check scorecard' and the metric list suggest full CFO-level analysis versus the narrower rule-of-40 tool, but no explicit when-to-use/when-not or alternative routing is given. The free-sample pointer is a convenience, not guidance.

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