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 key behavioral traits: 'Free, read-only entry point,' which tells the agent there is no cost and no mutation risk. It also enumerates the returned payload categories (capabilities, authority modes, proof key, price/network info, endpoints), though it omits auth requirements or rate limits — likely moot for a free read.

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?

Two sentences, front-loaded with the critical 'call this first' instruction and the cost/safety profile, followed by a compact enumeration of return contents. No wasted words.

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?

There is no output schema, so the description must characterize the return, and it does so by listing the returned fields (capabilities, authority modes, proof key, price/network, endpoints). It is complete enough to act on, though it does not describe the structure or format of those values.

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, which sets the baseline at 4. The description correctly does not invent input options and instead redirects attention to what the call yields, matching the empty 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?

States a specific verb+resource ('get_trust_manifest') and positions it as the read-only discovery entry point, which cleanly separates it from the action-oriented siblings (authorize_x402_ap2, clearance_x402_ap2, verify_settlement). An agent can tell exactly what this returns without opening the 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?

Explicitly says 'Call this first when deciding whether Agent Transaction Trust fits an x402 purchase,' giving a clear ordering signal relative to the authorize/clearance/verify siblings. It stops short of stating when NOT to use it or naming a fallback alternative, so it is clear context rather than 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.