configure_external_access

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

Annotations only convey idempotent, non-destructive, read-write hints. The description adds important behavioral detail: approval mode emails admins on every signup, unapproved users are never billed, appLoginUrl becomes the approval email button, and reading is supported by calling with no changes. No contradiction with annotations.

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 dense and front-loaded with the core purpose, then details each policy and parameter. Every sentence adds value, though the long run-on style could be tightened without losing information.

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 configuration tool with three optional parameters and no output schema, the description is complete: it covers permissions, read vs. change behavior, every enum value, the appLoginUrl semantics, side effects, and prerequisites. Nothing needed for correct invocation is missing.

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%, so the baseline is 3, but the description substantially enriches each parameter: it explains the real-world meaning of open/approval/closed, the admin email and billing implications, the appLoginUrl button behavior, and the '' clearing convention. This goes far beyond the schema descriptions.

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 verb ('Read or change') and a clear resource: how external users get into an organization via registrationPolicy and appLoginUrl. It also distinguishes this configuration tool from general authentication tools like sign_up and login by spelling out the external-user flow it controls.

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 concrete usage context: call with no changes to read settings, set appLoginUrl when deploying an app using this flow, pass '' to clear it, and organization admin rights are required. It doesn't explicitly name sibling alternatives, so it stops short of a 5.

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