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

Annotations declare readOnlyHint=false, idempotentHint=false and destructiveHint=false, so safety is partly covered; the description adds genuinely new context by disclosing a side effect ('included in the assessment it closes') and a privacy guarantee ('Only amounts, dates, rates and charges are read from a message, never the parties'). That second point is behavior an agent could not learn from any structured field and matters for sensitive bank message data. It does not contradict the annotations, since signing and closing an assessment is consistent with a non-read-only call.

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 opening 'After money moves' is well front-loaded and the second sentence usefully lists the four reconciliation questions. But the prose is dense and telegraphic, and the closing fragment 'Paid, included in the assessment it closes.' is grammatically broken and forces re-reading to extract the side-effect information. Tightening that sentence would materially improve it.

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 non-read-only, open-world tool with no output schema, the description does the important work: it describes what the returned signed reconciliation contains, states the input prerequisite, and discloses both the privacy handling of bank messages and the closure side effect. It is only short of full marks because it says nothing about failure behavior (e.g. a mismatch between quoted and landed amounts) or the consequence of non-idempotent repeated calls.

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 all three parameters and the nested settlement fields are already documented, which sets the baseline at 3. The description adds modest meaning by framing 'message' versus 'settlement' as an either/or evidence path and by stating the provenance of 'attestation'. No format, validation, or fallback-precedence detail is added beyond the schema.

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 names a specific verb+resource: it takes the signed decision record from swapeazi_guardrail_check plus settlement evidence and 'returns a signed reconciliation'. It goes further by enumerating what the reconciliation answers (quote honoured, policy adherence, market drift, bank chain cost), which lets an agent distinguish this from generic siblings like reconcile_payment. It stops short of explicitly naming which sibling it replaces, so it is not a 5.

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?

Timing is clearly implied by 'After money moves' and the prerequisite is explicit ('the signed decision record from swapeazi_guardrail_check'). However, there is no statement of when NOT to use it versus the many adjacent siblings (reconcile_payment, reconcile_outcome, record_landed, track_payment_settlement), leaving the agent to infer boundaries. Usage is implied rather than routed.

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