Paylyte

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

Annotations already declare destructiveHint=true, openWorldHint=true, idempotentHint=false and readOnlyHint=false, so the safety profile is largely supplied. The description adds real value beyond that: Paylyte holds no wallet, missing payment returns the 402 challenge with price and maxAmountRequired, and unknown paths are refused. However, it never addresses the non-idempotent risk (that a retry could charge twice) or whether payment is refundable, which is the most consequential behavior for a money-spending tool.

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?

Front-loaded with the action and price/rail, then the input contract, then the failure modes. Sentences are dense but each carries information; the side note about not writing or editing Core is the only borderline line.

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 five-parameter, no-output-schema mutation tool, the description covers cost source, payment precondition, the 402 fallback, and rejection of unknown paths — enough to call it correctly. The main gap is what a successful response contains and retry/idempotency behavior, both of which matter for a paid call.

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 each of the five parameters is already documented in the schema. The description restates the two central inputs (path and X-PAYMENT) but adds no syntax, allowed values, or conditional rules beyond what the schema says, so baseline 3 applies.

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 (buys one live paid offering) plus the scope ('from the same catalogue shown on agent cards') and the payment rail (x402, priceUsd). An agent can tell this is the purchase step rather than discovery, but the description never names the sibling tools, so differentiation is inferred rather than stated.

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?

Clear context for invocation: the caller must already hold a signed X-PAYMENT for a specific path, and omitting payment yields a 402 challenge instead of an error. It does not explicitly tell the agent to call discover_live_offerings first or name any alternative, so it falls short of full when/when-not guidance.

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

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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, and the description redundantly confirms "Read only." The genuine added value is the caveat that being listed confers no trust score or proof-of-outcome record, which prevents a false inference an agent could otherwise make from the listing. It does not mention pagination or result-size behavior.

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 short sentences, front-loaded with the core action and the returned fields before the trust caveat. The closing "Read only" duplicates the readOnlyHint annotation and could be dropped without loss.

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?

With no output schema and no parameters, the description carries the return-value burden and does so by naming each field, including the sellerAgentId. The one missing piece is whether the listing is complete or paginated and roughly how large it is.

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 tool takes zero parameters, so there is no parameter semantics to document and the baseline of 4 applies. The description instead spends its words on the shape of the response, which is the more useful information here.

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 opens with a specific verb and resource ("Lists the live data offerings on Paylyte") and enumerates the returned fields, so an agent knows exactly what it gets back. It does not explicitly name the siblings buy_live_offering or get_track_record, but "lists" is plainly distinct from a purchase action.

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?

There is no explicit when-to-use or when-not statement. The caveat that a listed seller has no Agent Trust Score or Proof of Outcome record from listing alone implicitly routes the agent to get_track_record for trust checks, but the connection is left for the agent to infer rather than stated.

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

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the trailing 'Read only' is largely redundant. The description does add real behavioral context: the data comes from the Paylyte ledger, and the response includes an additional 'Outside sales' count that a caller might not expect. It omits any note about how the twelve alias parameters interact or which identifier wins when several are supplied.

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 short sentences, front-loaded with what the tool returns and followed by the two calling modes. Minor waste in the redundant 'Read only' clause and the slightly awkward 'Also returns Outside sales, a separate count of this agent's sales to outside customers', but nothing obstructive.

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?

With no output schema present, the description carries the burden of describing return values and does so at a useful level: Trust Score, individual claims with grade and proof, an agent list when no input is given, and an Outside sales count. It is not fully complete — the shape of the claim list and the meaning of 'grade' are left unspecified — but an agent could call this tool confidently from what is given.

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% and the schema itself documents the twelve alias parameters, so the baseline is 3. The description adds genuine meaning beyond the schema by tying claimId to a single-claim result with grade and proof, and by stating that omitting input returns the agent list — mode semantics the schema does not convey. It does not restate the alias mappings, but it doesn't need to.

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 and resource ('Returns an agent's public track record from the Paylyte ledger') and enumerates what comes back: Agent Trust Score, Proof of Outcome claims, and an Outside sales count. That is enough to distinguish it from the commerce siblings buy_live_offering and discover_live_offerings, which are action-oriented rather than retrieval. It stops just short of 5 because it never explicitly contrasts itself with those siblings.

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?

The description explains two invocation modes ('With claimId, returns one claim... With no input, returns the list of agents'), which implies how to call it. However, it gives no guidance on when an agent should reach for this tool versus the sibling discovery/buy tools, and no prerequisites or caveats about which identifier form is required beyond what the schema states.

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