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

No annotations exist, so the description carries the full burden. 'Show' implies a read-only introspection with no side effects, and the enumerated fields (owner, permissions, spend limit) add real value, but it never states that nothing is mutated, that there are no arguments, or whether the spend limit is enforced elsewhere.

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?

A single front-loaded sentence that names the actor, its ownership, its authorization scope, and its budget. Every clause carries distinct information; nothing is redundant.

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 parameters and no output schema, the description usefully enumerates what comes back (agent identity, owner, permissions, 30-day spend limit). That covers the essentials for a trivial introspection call, with only minor gaps such as return format or whether spend is cumulative or remaining.

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 the baseline of 4 applies; there is nothing for the description to disambiguate, and it correctly implies the call is argument-free.

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 ('Show') and enumerates the exact resource set: this agent, owner, permissions, and 30-day spend limit. It is clearly distinct from the marketplace siblings (buy_listing, publish_listing, etc.), though it never explicitly contrasts itself with them.

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?

Usage is only implied: an agent infers it should call this to learn who it is, who owns it, what it may do, and its spending cap. There is no explicit when-to-use or when-not-to-use guidance, no mention of whether permissions or limits can change.

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