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

Annotations declare the safety profile (readOnlyHint=false, openWorldHint=true, destructiveHint=false), so the description earns credit for adding cost context ('0.10 USD... when runtime commerce is active') and disclosing output composition including low-signal/no-change sections, confidence, and limitations. It does not explain the meaning of readOnlyHint=false or the metering trigger conditions in any detail, but it adds real context beyond structured fields.

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?

The comparison and invocation sentences are dense and reasonably front-loaded, but the leading pricing sentence is opaque jargon that consumes prime position without clearly helping the agent select or invoke the tool. The core content is efficient once you get past it.

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 an 8-parameter, open-world comparison tool with an output schema, the description covers purpose, invocation logic, output composition, and an explicit non-goal. It omits sibling routing and any note on cost/metering preconditions, which are the only real gaps given the output schema handles return values.

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% and dependentRequired already encodes that the two accessions travel together, so the baseline is 3. The description adds semantics the schema cannot express: the either/or choice between supplying both accessions and omitting both to let 'form' drive deterministic latest-pair selection.

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 second sentence states a specific verb and resource: 'Compare two same-form 10-K or 10-Q filings' and enumerates the return content. It is clear, but it never differentiates itself from obvious siblings like compare_filings or check_disclosure_changes, and the opening pricing sentence ('Configured 0.10 USD fast specialist operation when runtime commerce is active') muddies rather than clarifies purpose.

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 gives explicit invocation logic: 'Supply both accessions for an exact pair, or omit both and choose form so FiledProof deterministically selects the latest comparable pair,' and adds a scope exclusion ('not a legal materiality or investment-significance determination'). It stops short of naming sibling tools or when-not-to-use conditions, so no routing guidance against alternatives.

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