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

Annotations already declare readOnly/idempotent/non-destructive/closed-world, so the safety bar is met elsewhere; the description adds real value by disclosing the return shape ('a checklist of what is ready and what is missing'), the conditional behavior when llc_name/county/formation_date are supplied (it additionally lists form-to-Filing-Receipt match items), and a scope caveat ('An automated checklist, not legal advice'). It stops short of stating what a partial/empty input yields or whether missing optional params degrade the checklist.

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?

Front-loaded with the core purpose and terminated by the sibling-exclusion clause, which is the right ordering. The middle enumeration is a single very long run-on sentence packing six checklist items plus three form IDs, which would read faster as a short list, but no sentence is filler.

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 9-parameter, zero-required tool with no output schema, the description covers the essential unknowns: what the return is (a readiness checklist), what triggers the extra form-matching output, and what it explicitly does not cover. The only gap is that all 9 params are optional and the description never says which combination produces a meaningful verdict versus a trivial one.

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; the description still earns above baseline by tying specific parameters to a document-type table (llc_type → DOS-1708-f domestic / DOS-1707-f foreign / DOS-1709-f PLLC) and by explaining that llc_name, county and formation_date exist to cross-check the form against the Filing Receipt. It does not mention payment_method or expedited, leaving those entirely to the schema.

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?

Opens with a specific verb+object: 'Checks whether a Certificate of Publication filing package ... is complete,' then enumerates exactly the document set evaluated (DOS-1708-f/DOS-1707-f/DOS-1709-f, both affidavits, $50 fee, signatures, Department address). The closing sentence names each sibling it is not, so an agent can route without opening another 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?

Explicit negative routing: 'Do NOT use for notice text (use ...verify_ad_compliance or ...generate_ad_text), the process overview (use ...get_process_guide), or requirements (use ...check_requirements).' Each exclusion names the correct replacement. This is the strongest form of when/when-not guidance.

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