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

With no annotations, the description carries the full burden and does disclose several traits: the check is free, it is read-only, and it is limited to signature/expiry rather than settlement. It does not describe failure behavior (what an invalid or expired token yields) or any rate/limit constraints, which is the remaining gap.

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 safety/cost profile ('Free, read-only token check') is front-loaded as a scannable lead, followed by one dense sentence covering validation targets and the explicit non-goal. No filler sentences.

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 single-parameter verification tool with no output schema and no annotations, the description covers purpose, scope, and cost/safety. It omits any hint of the result shape (valid/invalid, expiry info), which is a minor gap since no output schema exists to fill it.

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?

Only one parameter and schema coverage is 100%, so the schema already documents 'token' fully. The description restates the accepted token origins, which mirrors the schema text rather than adding format or syntax detail beyond it. 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+resource ('verify/validate ... a Trust token') and enumerates the token types it handles (policy, authorization, clearance, settlement receipt). It also carves out scope against the sibling verify_settlement by declaring it does NOT perform on-chain settlement verification, so an agent can separate 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?

'Use this to validate the signature and expiry of...' gives clear positive guidance and the closing clause states when not to use it (settlement verification). It stops short of naming the alternative tool (verify_settlement) as the replacement, so the routing is implied rather than explicit.

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