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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the safety profile is partly covered. The description adds meaningful behavioral detail beyond annotations by stating that the account stops being read and is never proposed again. It does not discuss reversibility or response behavior, but the key consequence is disclosed.

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 description is short, front-loaded, and every sentence earns its place. It states the action first, then the behavioral consequence, then the scoping rule. There is no redundant or filler text.

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?

For a mutation tool with no output schema, the description covers the essential purpose, consequence, and Space scoping. The schema is fully described, so parameter details do not need to be repeated. It could be slightly more complete by explicitly contrasting with confirm_competitor_library_account, but the core context is present.

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 description coverage is 100%, so the schema already documents competitor_id, body, and space_id. The description mentions the space_id override, but mostly repeats what the schema already says and adds little about the nested body fields sourceId and ref. Baseline 3 is appropriate when the schema carries parameter semantics.

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 action on a specific resource: rejecting a library account as not being a given competitor. It also states the outcome, that the account stops being read and is never proposed again, which clearly distinguishes it from the confirm/track siblings. It does not explicitly name the sibling alternative, so it is clear but not maximally differentiated.

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 gives clear usage context: use this when a library account is not the competitor. It also explains Space scoping and points to set_active_space or the space_id override for switching context. It does not explicitly say to use confirm_competitor_library_account in the opposite case, but the usage condition is otherwise clear.

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