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

With readOnlyHint=false and destructiveHint=false already declaring a non-destructive mutation, the description adds real value: recording a GAIP receipt, the fact that it is free with no account, and the hard constraint that inputs must be public and non-personal. It does not address idempotency or replay-determinism, which the annotations leave as non-idempotent.

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?

Three tight sentences, front-loaded with the trigger condition and followed by prereqs, mode choice, return values, and constraints. Every sentence carries information, though the return/constraint sentences could be marginally tighter.

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, yet the description covers the return shape (per-check PASS/FAIL/UNKNOWN plus a delivery receipt) and the auth/cost/data-handling profile. For a 7-parameter tool with two enums, the main remaining gap is guidance on which BUYER_SUBMITTED parameters to supply together.

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 already 100%, so the baseline is 3; the description still adds cross-tool provenance for terms_id (it must come from assurance_prepare) and clarifies the PUBLIC_REPLAY vs BUYER_SUBMITTED choice beyond the enum labels. It stops short of explaining the BUYER_SUBMITTED field bundle (body, http_status, content_type, body_sha256).

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 concrete action (finishing/completing a Buyer Assurance check) and names the specific output (PASS/FAIL/UNKNOWN per check plus a delivery receipt). It implicitly positions itself against assurance_prepare by consuming the terms_id that prepare produces, though it never names assurance_verify or other siblings directly.

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?

"Use this when finishing a Buyer Assurance check" gives clear context, and the prerequisite (terms_id from assurance_prepare) plus the two mode choices are explained inline. It lacks explicit when-not-to-use guidance against siblings like assurance_verify, 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.