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

With no annotations, the description carries the full burden; it does disclose the returned rate components and the fiscal-year boundary semantics, which is useful. However it says nothing about pagination behavior despite exposing limit/offset, nothing about the verification_url flag's effect, and nothing about rate limits or auth. Adequate but clearly incomplete for a 7-parameter data tool with zero annotation coverage.

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 scope statement and returned fields are front-loaded before the parameter guidance, and nearly every sentence carries information. The leading 'Get perdiem CONUS' fragment is a near-tautological warm-up that adds little, but the body is dense and well-ordered.

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?

It covers what the tool returns and how the date/year selectors work, which is the core need given no output schema. It falls short on a 7-parameter, annotation-free tool: three parameters (limit, offset, verification_url) are undocumented anywhere, and the state_iso example contradicts the schema format.

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?

The description adds real meaning beyond the schema for the date/year interplay and the OCONUS alternative. But it describes the key parameter as a bare state code ('e.g. TX') while the schema mandates the 'US-' prefixed form documented as 'US-CA' — a conflicting example that could cause a malformed call — and it never mentions limit, offset, or verification_url, which have no schema descriptions either.

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?

States a specific verb and resource ('Department of Defense per diem for the continental U.S. by state code') and enumerates the values returned (lodging, local/proportional meals, incidentals, max per diem per season). It explicitly scopes itself against the sibling get_dtmo_perdiem_oconus by naming Alaska, Hawaii and territories as out of scope.

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?

Gives concrete selection rules for the temporal parameters ('`date` selects the rates in force on that day, `year` a fiscal year (Oct 1 to Sep 30); omit both for the current fiscal year') and routes non-CONUS queries to the OCONUS endpoint. It does not address when to prefer this over the GSA per diem siblings or search_dtmo_perdiem, so routing among the broader per diem family is left to inference.

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