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

The description discloses important behavioral details beyond the annotations: delivery is via a signed webhook to a caller-supplied URL, and the watched transition is specifically phantom to squat. This adds useful operational context without contradicting the readOnlyHint, openWorldHint, idempotentHint, or destructiveHint annotations.

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 with the core action, then gives usage context and delivery details. The phrase 'a name models invent that somebody then registers' is awkward and slightly garbled, but it does not prevent the overall structure from being useful and focused.

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 registration tool with no output schema, the description sufficiently covers what to register, when to register, and how notifications are delivered. It is missing explicit response-handling and duplicate-registration behavior, but the core invocation needs are met.

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 description gives meaning to both parameters: identifiers are dependency names to watch, and callbackUrl is a signed webhook destination supplied by the caller. Since the schema only describes callbackUrl and leaves identifiers undocumented, this description partially compensates, though it does not explain the internal namespace/value structure.

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 and resource: 'Register identifiers for notification when their verdict changes.' It also defines the phantom-to-squat transition, clarifying that this is a watch operation rather than a check, which distinguishes it from the sibling check tools.

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 clear guidance on when to use the tool: for dependencies that returned absent or phantom but will still be used, or for sets of dependencies worth monitoring. It does not explicitly name alternatives or state when not to use it, but the intended contexts are clear.

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