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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds real value beyond that by enumerating what a successful call returns (holder, UEI, dollars obligated, dates, location, bids, set-aside, office, official record link). It does not say what happens on a miss or malformed PIID, which keeps it from a 5.

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?

One sentence, front-loaded with the operation and identifier, then a compact comma-delimited field list. No preamble, no filler, every clause carries information.

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?

Since there is no output schema, enumerating the returned fields is exactly the right compensation, and for a 1-parameter read-only lookup that is nearly everything an agent needs. Only the not-found / invalid-PIID behavior is left unstated.

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 description coverage is 100% and the schema's own example ('36C25225P1123') is identical to the one repeated in the description, so no meaning is added. Baseline 3 for a fully documented single parameter.

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?

Names a specific verb (returns details) and resource (a VA HVAC or plumbing contract) and pins the access method to a keyed identifier ('by its contract number (PIID)'). That keyed-lookup framing distinguishes it from the filter/aggregation siblings (find_expiring_contracts, location_contracts, typical_prices) without needing to name them.

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?

Usage is only implied: an agent can infer this is the tool for an exact PIID, but the description never states when to prefer it over the sibling search tools or what to do when the PIID format is unknown. No exclusions, no prerequisites.

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