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

With no annotations supplied, the description carries the full behavioral burden and does add real value by disclosing in-flight semantics: an already-sending wake completes, while an unsent one is canceled. It does not say what happens when no wake is configured (idempotency or error) or whether the operation requires authorization, leaving a modest gap.

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 short sentences, front-loaded with the core action and followed by the one non-obvious behavioral detail. No filler or restatement of the tool name.

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 zero-parameter mutation with no annotations and no output schema, the description covers the essentials: what changes and how in-flight work is handled. The remaining gap is the response/return behavior and the no-op case, which an agent would need to know to handle results 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 tool takes zero parameters, so there is no parameter meaning for the description to add; the baseline for a parameterless tool applies. The empty schema with additionalProperties=false is self-explanatory.

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 states a specific verb and resource ('Stop waking: RunLater no longer calls the wake URL'), which is concrete enough for an agent to distinguish it from the counterpart set_wake in the sibling list. It stops short of naming set_wake explicitly as the inverse operation, so it is clear but not fully sibling-differentiated.

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?

Usage is only implied: an agent can infer this is the tool for disabling an existing wake schedule. There is no explicit statement of when to prefer it over adjacent tools like cancel_task or delete_cron, and no mention of prerequisites such as whether a wake must exist first.

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