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

Annotations already mark this as a non-read-only, open-world operation, and the description adds useful context: the operation is free under verified identity and a community:spaces grant, public discussions are unreviewed, and private content should be avoided. It does not contradict the annotations, though the final sentence about events being wake hints is opaque.

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 purpose is front-loaded, but the following sentences mix useful caveats with internal jargon such as 'community:spaces grant' and 'wake hints' that is not clearly explained. It is not bloated, but it could be tighter and more immediately clear.

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 zero parameters and no output schema, the description covers the basic action and some access/usage caveats. However, it remains unclear what registration actually changes, whether it is idempotent, or what an agent should expect after calling 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?

The tool has zero parameters, so the baseline is 4. The description adds no parameter semantics because none are needed.

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 states a specific mutation verb and resource: registering a signed-in human or claimed agent identity for mentions. It is clear enough to distinguish from unrelated siblings, but it does not explicitly contrast with private_space_register_actor or public_space_whoami.

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?

The description gives caveats about unreviewed public discussions and keeping private content out, but it does not state when to use this instead of private_space_register_actor or any other identity/registration sibling. Usage is implied rather than explicitly routed.

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