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

Beyond the annotations, it discloses two things the structured data lacks: the operation may be asynchronous with a 'live' state reached only later, and the response can carry a connect_url when a personal credential is required. It also declares the authorization scope (projects:write), which is useful for an agent that must hold the right privileges. It stops short of describing what changes on the target, how resend behaves, or what a failure response looks like.

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?

Four short, front-loaded sentences with no wasted wording; purpose comes first, then the credential caveat, then the polling step, then the scope. The telegraphic fragments ('Scope: projects:write') are efficient, though slightly clipped for an agent that has no other context.

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 six parameters and no output schema, the description carries return-value burden and does so partially by mentioning the connect_url and the live flag. It does not explain the rest of the response shape or how long polling typically takes, but for a non-destructive enablement tool this is close to sufficient.

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% and every parameter already carries its own description, so the schema does the heavy lifting. The description reinforces 'slot' and 'branch' and implicitly gestures at provider=own via the 'person's own credential' phrasing, but adds no meaning to resend, project_id, or organization_id beyond what the schema states. Baseline 3 applies.

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 opens with a specific verb and resource: 'Turn on a capability slot such as email for a branch.' It also names the sibling tool (capabilities.status) that handles the follow-up, so an agent can separate enabling from checking status without opening either schema.

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 concrete workflow guidance: hand the connect_url to the person rather than asking for a key in chat, then poll capabilities.status until live is true. That establishes the sequence and the alternative for verification, though it does not state any when-not-to-use conditions or what to do if polling never reaches live.

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