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

Annotations already declare the mutation profile (readOnly=false, idempotent=true, destructive=false), so the safety burden is partly lifted. The description adds useful context about what the token powers (stand-up/break reminders), but omits important behavior: whether re-registering overwrites an existing token for the same platform, and any auth requirements.

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 sentences, zero filler, and the core action and its payoff are front-loaded before the usage note. Every clause earns its place.

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?

With an input-only tool, existing annotations covering the mutation profile, and no output schema, the description is nearly sufficient. However, with 0% schema coverage it should explain the label parameter and idempotent/overwrite behavior for a repeated platform token.

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% for all three parameters. The description mentions a 'device token' and 'manual token,' loosely mapping to the token parameter, but says nothing about the label parameter or the platform enum values (ios/android/macos/web), leaving the schema to carry semantics it does not actually document.

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 verb and resource ('Register a device token') plus the concrete downstream effect (server reminders reaching the device). It contrasts with the automatic registration path ('the phone app registers itself'), though it never names sibling tools like list_devices or delete_device, so sibling disambiguation is only partial.

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?

Explicitly gives the use case: 'use this for testing or a manual token,' which implies the normal flow is automatic registration and this is the exception. No named alternative tool and no stated prerequisites, but the when-to-use condition is clear.

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