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

The description adds substantial behavioral context beyond the annotations: it discloses the $15.00 paid operation, retry-safe checkpoint state, deterministic attention triage, non-materiality caveat, and preflight rejection before charge. This is exactly the kind of operational transparency an agent needs, especially given the readOnly and idempotent annotations.

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 description is dense but efficiently structured: cost and scope are front-loaded, followed by output characteristics, limitations, disclaimers, and usage guidance. Every sentence adds useful information without redundancy, which is appropriate for a paid, multi-parameter tool.

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 complex paid operation with ten parameters, an output schema, and many siblings, the description is remarkably complete. It covers cost, prerequisites, alternatives, failure behavior, checkpoint semantics, return content categories, and a materiality disclaimer. Nothing essential is missing for an agent to invoke it correctly.

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 all ten parameters are already documented in the input schema. The description reinforces concepts like checkpoint state and prior-filing comparison, but it does not add meaningful param-specific format or interaction details beyond what the schema already provides, so the baseline score of 3 is appropriate.

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 states a specific action: compare new monitored filings against the prior filing of the same form and return prioritized topic-relevant changes. It clearly identifies the resource and the purpose, but it does not explicitly distinguish this tool from the sibling compare_filings or search_evidence, so it falls just short of full sibling differentiation.

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 description gives concrete sequencing guidance: use resolve_issuer/list_filings first when coverage is uncertain, and notes that payment preflight rejects invalid or non-comparable work before charging. It does not explicitly state when to prefer this tool over direct comparison tools, so the guidance is clear but not exhaustive.

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