Paylyte

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

Adds substantial context beyond the annotations: payment is over x402, Paylyte does not spend a wallet, a missing payment yields a 402 challenge containing priceUsd and maxAmountRequired, unknown paths are refused, and the tool does not write or edit Core. These are exactly the behavioral traits (cost, failure mode, retry policy, side-effect boundary) an agent needs before invoking a paid endpoint.

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-loads the core instruction and the priceUsd prerequisite. It is a touch repetitive ('Read priceUsd first' vs 'Do not retry payment until you have read priceUsd', the latter duplicating the schema), but every sentence still carries actionable content.

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 annotations covering the safety profile, the description covers the purchase flow, the 402 failure path, and refusal conditions, so an agent can call it correctly. It stops short of describing the successful paid response, which is the one remaining gap for a purchase tool with no output schema.

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%, so the schema already documents every parameter, including the meaning of payment, path, and the per-path-only params. The description mostly restates the priceUsd/402 guidance already present in the schema, adding little parameter meaning of its own; baseline 3 is appropriate.

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 ('buy one live paid offering from the catalogue') plus the payment mechanism (x402). It is plainly distinguishable from discover_live_offerings, which only lists offerings, and it names scope constraints (no writes to Core).

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 clear preconditions: read priceUsd first, do not retry payment until priceUsd is read, and only paths from the catalogue are accepted. The discovery step (discover_live_offerings) is implied via 'the catalogue you already see' but never explicitly named in the description as the routing alternative.

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, so the safety profile is covered. The description adds real semantic context beyond that: prices are denominated in priceUsd, and external sellers carry no Agent Trust Score or Proof of Outcome merely from listing. It does not describe volume, pagination, or freshness of the listing.

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 core statement is front-loaded, but several sentences are loose or puzzlingly negative, e.g. 'It is not a new Paylyte product' and the repeated 'Read that price before you buy,' which read as filler relative to the tool's purpose. Tighter phrasing would earn more per sentence.

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 zero-parameter, read-only list tool with no output schema, the description supplies the key return semantics an agent needs (USD pricing, external-seller caveats). Missing pagination/result-size behavior keeps it short of full completeness.

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 is 4. The description correctly adds no fake parameter guidance and instead spends its words on result semantics.

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 specific verb and resource: 'list every live paid offering,' and clarifies the scope includes both Paylyte products and external sellers. It distinguishes itself from siblings only implicitly (the 'read that price before you buy' line gestures at buy_live_offering), so it is clear but not sharply differentiated.

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 only usage guidance is the implied 'read that price before you buy,' which suggests this precedes a purchase, but the description never explicitly states when to use this versus buy_live_offering or get_track_record. Usage context is present but left to inference.

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, and the description reinforces it ('Read only. You cannot write or edit Core'), which is redundant but reassuring. It adds genuinely new behavioral context by disclosing the data source (public ledger, same as the listed endpoints) and that Outside sales is a distinct metric, helping the agent interpret the payload correctly.

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 core purpose is front-loaded, but the enumeration of four REST endpoints and the triple-negative clarification ('not the Agent Trust Score, not Rank, and not a Proof of Outcome grade') is repetitive. The content earns most of its place but could be tightened without losing meaning.

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, the description carries the burden of describing returns and does so reasonably well, naming the Trust Score, one Proof of Outcome claim, and the Outside sales count/USDC. Read-only behavior is covered. It is nearly complete for a two-parameter read tool, though it omits what happens when claimId is absent or how multiple claims are handled.

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%, so both parameters (slug and claimId) are already documented in the schema. The description references 'one Proof of Outcome claim' and the endpoint paths, which loosely maps to the parameters but adds no syntax or format detail beyond the schema. 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?

The description states a specific verb (read/pull) and resource (Agent Trust Score and a Proof of Outcome claim from the public ledger), and names the exact REST endpoints that back it. An agent can immediately tell this is a read of ledger data, clearly distinct from the buy/discover 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?

It establishes the context of use ('You can read... from the public ledger') and usefully clarifies what the card is NOT (not Rank, not a Proof grade, Outside sales is separate), but it never states when to choose this tool over alternatives or any preconditions. Usage is implied rather than spelled out.

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