get_registry_public_key

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

With no annotations supplied, the description carries the behavioral burden and does so well: it discloses the trust-channel requirement, that the fetch is a one-time operation, the key_id comparison step, offline verification, and the error shape ({'error': '...'}). It does not cover authentication requirements or rate limits, but for a public-key endpoint that is a minor 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?

Purpose is front-loaded in the first sentence, the operational workflow second, and the return shape last. Every sentence is load-bearing and no filler appears.

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?

An agent knows what the tool returns, how to use the result, and what failure looks like. The return fields are also restated in prose despite an output schema existing, which errs on the side of completeness for a zero-param tool.

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 is 4; there is nothing for the description to disambiguate in the input schema and it correctly spends no words on parameters.

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 (return the registry's public key) plus the audience and goal (third parties who verify attestations). It is clearly distinguishable from siblings such as register_principal_key or issue_mandate_attestation, which write keys or mint attestations rather than expose the registry key for offline verification.

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 a concrete usage pattern: fetch once through a trusted channel, compare key_id against the operator-published value, then verify attestations offline. That is clear when-to-use context, but it names no alternatives or explicit when-not conditions, so it stops short of the top mark.

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