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

With no annotations, the description carries the full burden of behavioral disclosure. It clearly states the side effect (session moves from authenticating to capturing) and the required user confirmation. It could add idempotency or error behavior, but the core behavior is explicit and not misleading.

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 compact and front-loaded: the core action and call condition appear first, followed by the state-transition detail and the exception about auth_evidence. Every sentence earns its place with no redundancy.

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 simple state-transition tool, the description covers the trigger condition, the state change, and the distinction from automatic release. An output schema exists, so return values need not be described. It lacks only optional details such as error handling or calling it twice, which are not essential for correct use.

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 has one required session_id with no description, and schema description coverage is 0%. The description never mentions session_id, so it adds no parameter semantics beyond the self-explanatory parameter name. Given the low coverage, the description should have compensated but does not.

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 uses a specific action and resource: it 'releases/permits starting recording' and explicitly states the resulting session transition from authenticating to capturing. It also differentiates itself as the main release method, contrasting with get_capture_status's auth_evidence behavior.

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 a clear precondition: call only after the agent has asked the user and the user has confirmed they are logged in. It also warns that auth_evidence from get_capture_status does not automatically release the session, which helps route the agent. It does not explicitly enumerate all sibling alternatives, but the main-vs-automatic contrast provides solid guidance.

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