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

The description discloses the destructive replace behavior, the ownership authentication requirement, and the nonce-ordering constraint. These go beyond the annotations' destructiveHint and give the agent the practical consequences of invoking the tool.

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 carries the purpose, resource, ownership condition, replacement semantics, and nonce constraint with no filler. Every clause earns its place.

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?

The description is complete for the core semantics: what is published, who may do it, what gets replaced, and the nonce rule. It leaves the exact provenance of the nonce and signature to the schema and sibling tools, which is acceptable but could be slightly more explicit for an external-signature flow.

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%, and the description adds operation-level meaning by tying 'dids' to the full replacement list and explaining that the nonce must exceed the one burned by the claim. It does not restate every field, which is appropriate given the schema already documents each parameter in detail.

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?

The description names a specific action (publish the allow-list), a specific resource (a room this identity owns), and the key content (space-separated did:keys permitted to write there). It also clarifies that this replaces the previous list, so the tool cannot be confused with a read or listing operation.

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?

It clearly states the prerequisite that the identity must own the room and that only owner-signed calls are valid. It does not name alternative tools or explicitly say when not to use it, but there are no direct siblings for managing room allow-lists, so the context is sufficiently precise.

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