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

Annotations already declare readOnly/idempotent/non-destructive/openWorld, so safety is covered. The description adds genuinely useful behavior: it returns an approximate file-by date derived from the denial notice date, and warns that the date on the user's own notice governs. It doesn't describe output shape, but with annotations this is solid.

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, then example queries, then the key caveat. The three example phrases are mildly redundant but serve retrieval matching; no dead sentences.

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?

No output schema exists, and the description covers the meaningful return (an approximate deadline) plus the authoritative-date caveat. Parameters, defaults and the urgent flag are carried by the schema, so an agent has enough 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 three parameters (including the urgent enum and plan_type cross-reference) are already documented. The description adds only the linkage that denial_date yields an approximate file-by date, which is minor value over the schema. 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?

The description states a specific resource and scope: appeal filing deadlines plus the plan's decision-speed obligation. It is clearly distinct in domain from explain_denial_code and draft_appeal_letter, though it never explicitly distinguishes itself from get_appeal_rights, which is the nearest sibling.

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 names concrete user phrasings ('how long do I have to appeal?', 'how fast does my insurer have to answer?') that map to this tool and ties invocation to having the denial notice date. No when-not-to-use or sibling routing is given, so it stops short of a 5.

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