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

Annotations already declare readOnly=false, openWorld=false, idempotent=false, destructive=false, so the safety profile is partly covered. The description adds genuinely new context beyond them: that only synthetic/test identities should be used, that no real credentials should be requested, and that lifecycle management (inspect/delete) happens through other tools and configuration through resource_request. It stops short of describing what is returned (client IDs/secrets, issuer/endpoint URLs) or whether created providers persist indefinitely.

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?

Three dense sentences, front-loaded with the capability statement, then safety constraint, then lifecycle/routing note. Every sentence carries information; the only mild awkwardness is the terse 'Inspect and delete with existing mock tools' clause, which requires the reader to infer which tools.

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 an 8-parameter creation tool with nested objects and no output schema, the description covers purpose, safety and lifecycle well but leaves the parameter space opaque, especially the scenario enum and TTL/persistence behavior. An agent could call it correctly only for the minimal required arguments and would be guessing on the optional ones.

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 0% across 8 parameters, so the description carries the full burden and largely does not meet it. It hints at 'synthetic users' mapping to the users array, but never explains headless, persistent, ttlSeconds, claims, or — most importantly — the nine-value scenario enum, whose failure-injection semantics (access_denied, invalid_pkce_verifier, rotated_signing_key, etc.) are impossible to infer from the schema.

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+resource pair ('Create a mock OAuth 2.0 and OpenID Connect test provider') and enumerates the concrete capabilities it provisions (synthetic users, S256 PKCE, client credentials, refresh tokens). An agent can tell this apart from siblings like create_mock_api or create_email_inbox without opening the 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 explicitly constrains usage ('Test accounts only. Never ask for real credentials') and routes the agent elsewhere for adjacent operations ('Inspect and delete with existing mock tools; configure through resource_request kind oauth-providers'). What is missing is an explicit comparison against create_mock_api or a statement of when an OAuth provider is the right choice over a generic mock API.

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