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

Annotations already declare read-only, idempotent, non-destructive, closed-world behavior, so the safety profile is largely covered and the description's "Read-only call" restates it. It does add real value beyond annotations: a 32 KB payload ceiling, 60 RPM rate limit, auth options (?demo=true or MPP at 30 sats), and a 400 response on invalid input. Those operational limits are useful, but the return shape and how partial criteria satisfaction is reported are left unstated. With annotations carrying the behavioral baseline, this is solid added context rather than a full disclosure.

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 verdict-producing action and the three outcomes, then routing guidance, then operational constraints, so the most decision-relevant content comes first. It is one dense block with every clause carrying information (limits, pricing, error code), though the run-on cramming of transport/auth/limits reduces scannability slightly.

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 read-only arbitration tool with a full schema, an enum-bearing standard, and an output schema, the description covers purpose, routing, budget limits, rate limit, auth method, and error behavior. Since an output schema exists, it need not explain the returned verdict structure, so no decision-relevant gap remains.

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 arbitration_standard enum are already documented in the schema, which sets the baseline at 3. The description's parenthetical "accepts 'deliverable' (with enum defaults)" is slightly muddled since deliverable is a plain string and the enum belongs to arbitration_standard, adding no real semantics. The terms default and standard default are already in the schema, so the description neither compensates nor detracts materially.

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 (evaluates), resource (worker agent's submitted deliverable), comparison basis (contract acceptance criteria), and the exact outcome (deterministic escrow verdict) with all three verdict values spelled out. It also explicitly contrasts with the nearest sibling, enforce_json_schema_types, so the agent can distinguish the two 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 both sides of the routing decision: use when settling multi-agent bounties or verifying subcontractor deliverables before releasing MPP/L402 escrow funds, and use enforce_json_schema_types instead when only syntactic JSON Schema property types matter. It even notes the exclusion is about not evaluating semantic contract terms, which is the exact boundary an agent needs.

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