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

No annotations are provided, so the description must carry the full burden. It fails to disclose side effects (e.g., does it override existing shares?), reversibility, permission requirements, or the existence of the 'public' mode which is present in the schema but not mentioned in the description. This is a significant gap for a mutation 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?

The description is a single, focused sentence with a colon introducing the modes. It front-loads the core purpose and then clarifies options. It is concise and efficient, though the omission of the 'public' mode could be seen as a structure issue.

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 tool with 4 parameters and no output schema, the description is incomplete. It fails to mention the 'public' mode allowed by the schema, does not explain what happens to existing access settings when changing modes, and omits any prerequisites or consequences. An agent would need to infer or look elsewhere for critical behavior.

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 all parameters. The description adds extra meaning for the 'mode' parameter (explains members vs listed) but does not clarify 'public' (which the schema does) or add context for tier/tool/workspace beyond what the schema provides. Baseline 3 is appropriate.

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 action ('Set who a tool is open to by default') with clear explanations of the two main modes. This distinguishes it from sibling tools like share/unshare (explicit sharing) and access_requests (request handling) by emphasizing the 'default' aspect.

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?

Provides a single recommendation: 'Use listed for anything sensitive.' However, it doesn't explicitly contrast with alternatives like share or access_requests, nor does it state when not to use this tool. The context of setting default access is clear but not elaborated.

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