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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and a closed-world scope, so the safety profile is covered. The description adds value by naming the two outputs (price and deadline) and the pricing tiers ($120 federal via Epics Deals, $75 B2B/white-label per filing). It does not say whether deadlines are per-year, jurisdiction-specific, or how pricing varies by form.

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 lead question front-loads the user intent, followed by the form list and pricing tiers, all in two sentences with no filler. The promotional phrasing ('via Epics Deals') is slightly sales-oriented but still conveys the price basis, so it roughly earns its place.

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 single-parameter read-only lookup with no output schema, the description covers inputs and names the two returned values. However, it never specifies whether 'deadline' is calendar-year dependent or which state jurisdictions 'state_return' covers, leaving gaps an agent must discover by calling.

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%, but 'form' is a bare enum whose values are cryptic ('5472_1120', '1040_nr', 'state_return'). The description expands these into human-readable filing types (e.g., Form 5472 + pro-forma 1120 for foreign-owned single-member), which is genuine meaning beyond the schema's one-line 'The form or filing type'.

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 verb-and-resource pair: it returns price and deadline for filing a US LLC tax return, enumerated by form. The form list (5472 + pro-forma 1120, 1065, 1040-NR, 1120/1120-F, 990, state filings) maps directly to the enum, so an agent can tell what the tool answers. It stops short of distinguishing itself from the overlapping siblings llc_cost_calculator and compliance_deadlines.

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?

There is no explicit statement of when to call this versus llc_cost_calculator (costs) or compliance_deadlines (deadlines), even though this tool appears to overlap both. Usage must be inferred from the phrase 'price and deadline', and no exclusions or prerequisites are given.

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