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

No annotations, so the description carries the full burden and does well: it discloses delta semantics, that cursors are stable across restarts, the bootstrap path, that the response includes changed_count and a new next_cursor, and the $0.01 x402 price. It omits any rate-limit or cursor-expiry behavior, keeping it short of 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?

Dense but front-loaded, with the core delta semantics and bootstrap instruction first, followed by pricing and docs. The opening fragment "delta of /v1/contrac." reads like truncated boilerplate and costs a little clarity.

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 one-param delta tool with no output schema, the description covers what an agent needs: how to call it, how to bootstrap, what comes back (awards plus changed_count and next_cursor), and how to avoid paying unnecessarily. Nothing material is missing.

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 the baseline is 3, but the description adds value beyond the schema by explaining the parameter's role in the cursor loop (feed back next_cursor, omit once to bootstrap) and asserting cursor stability across restarts.

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/resource/scope: only federal contract awards changed since a cursor, keyset delta of /v1/contracts/awards. It explicitly distinguishes itself from the sibling changes endpoint and from the full awards list, so an agent can pick it without opening a 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?

Gives explicit operating instructions: pass since=<next_cursor from your last call>, omit since once to bootstrap, and poll the free sibling /v1/contracts/awards/changes for counts so you "pay only when there is something to fetch." When-to-use and cost-avoidance guidance are both present.

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