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

Discloses the non-obvious one-time return of the plaintext clientSecret, which materially changes how an agent should capture the response. This adds behavioral context beyond annotations, which already mark it as non-read-only, non-idempotent, and non-destructive.

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 compact sentences lead with the operation and then surface the critical one-time secret behavior. Every sentence earns its place, and no content is repeated from the title or schema.

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 four-parameter create tool with full schema coverage, an output schema, and annotations, the only missing contextual risk is the one-time secret, which the description explicitly discloses. An agent has enough information to decide to call it and to handle the response correctly.

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?

The input schema covers all four parameters with descriptions and enum values, so the description carries no parameter burden under the baseline. It doesn't add meaning beyond the schema, such as validation behavior or how providerType affects secret generation.

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 and resource ('Register an OAuth client') and adds scope ('for mock identity flows'), so an agent knows what entity is being created. It does not explicitly contrast with sibling operations such as rotate_secret or identities.create, relying on the create/delete/list split already present in the tool name.

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?

'for mock identity flows' provides clear intended context and implies a test environment, but the description doesn't say when to choose this over sibling operations like oauth.clients.rotate_secret or oauth.clients.get. No explicit exclusion or alternative is given.

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