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

Well beyond the annotations, it discloses the consequence of silence (the claim expires and the task is treated as abandoned and offered to someone else) and explains why that is deliberate. This is exactly the kind of operational risk context an agent needs to keep a lease alive.

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 imperative action is front-loaded and the rationale follows in a compact three-sentence block. The middle sentence is long and clause-heavy, but every clause carries a distinct fact (cadence, consequence, design intent), so little is wasted.

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 five parameters, no output schema, and annotations already covering the safety profile, the description supplies the lease lifecycle and cadence an agent must know. It stops short of describing what the call returns or how to detect an expiring lease before it lapses.

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 100%, so runId, leaseToken, note, status, and learnings are already documented; the baseline is 3. The description adds only incidental param semantics (the renewEverySeconds timing signal and that blocked/needs_input park the task), largely duplicating what the schema's status description already says.

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 opening line 'Say you are still working' states the action in plain terms, and the second sentence pins it to the lease-renewal mechanism ('call this ... and it renews'). It is clearly distinguishable from siblings like start_task, complete_task, and request_input.

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 gives an explicit cadence rule (at least every renewEverySeconds returned by start_task) and an explicit alternative use ('the place to say you are blocked or waiting on the user'). It does not name when to prefer request_input over the needs_input status, so the routing between those two overlapping mechanisms is left slightly ambiguous.

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