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

With no annotations provided, the description carries the full burden. It discloses the core behavior (add and remove permissions), the default empty lists, and the project_key fallback, as well as the return type (JSON string). However, it does not specify side effects, error conditions, permission requirements, or whether changes are immediately persistent. Some behavioral transparency is present, but not comprehensive 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 structured with a purpose sentence, then Args and Returns sections. Every sentence adds value, and the parameter explanations are necessary because the schema provides no descriptions. It is slightly longer than strictly needed but not wastefully verbose.

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?

The description covers the main input parameters and return type, and the existence of an output schema is noted. However, it lacks information about edge cases such as what happens when permission IDs are invalid, whether the role must exist, or whether the operation is idempotent. For a mutation tool without annotations, this leaves gaps for the agent.

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 0%, but the description fully compensates by explaining each parameter: role_slug is an identifier, add_permissions and remove_permissions are lists of permission IDs with defaults, and project_key acts as a tenant ID with a global fallback. This adds essential meaning beyond the bare schema and clarifies default behavior.

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 first sentence, 'Assign or remove permissions from a role,' clearly states the action and target. This distinguishes it from sibling tools like get_role_permissions (read-only) and create_permission (creating a permission definition). The verb 'assign/remove' makes the purpose unambiguous.

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 context on how the tool works (e.g., project_key fallback to global tenant) but does not explicitly state when to use it over alternatives or provide exclusions. Usage is implied by the role-permission modification function, but there is no direct guidance about 'use this instead of get_role_permissions' or when not to use it.

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