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

Annotations already declare readOnlyHint=true, so the agent knows this is a safe read. The description confirms it is a GET, but adds no behavioral detail beyond that (no pagination, result shape, or filtering semantics). With the safety profile covered by annotations, a 3 is appropriate.

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?

Two short sentences, front-loaded with the purpose before the filter detail. The trailing 'Basis Theory: GET /permissions' is largely redundant with the readOnlyHint and adds little, but costs almost nothing.

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 zero-required-parameter read-only list endpoint with an output-schema-less return, the description supplies enough to call it correctly. Nothing critical is missing given annotations cover the safety profile.

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 the single optional parameter is fully documented in the schema. The description paraphrases the same idea ('optionally for one application type') without adding syntax, format, or behavior beyond the schema. Baseline 3.

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 verb+resource: it lists permissions that can be granted to an application, and narrows the scope to a single application type. It is distinguishable from the sibling list_* tools (applications, roles, tokens) without opening a schema, though it never names them.

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 phrase 'optionally for one application type' conveys the available usage mode, so the agent can infer when the filter applies. There is no explicit when-to-use versus when-not-to-use guidance and no alternative tool is referenced.

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