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

Annotations mark this as a mutating, non-idempotent operation. The description usefully discloses the side effect ('renews the existing four-hour ownership lease') and clarifies it does not transfer ownership, which goes beyond the raw 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?

Two succinct sentences, front-loaded with the core action ('Publishes progress on an accepted handoff') followed by the key constraints. No filler or 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?

Covers the main lifecycle behavior (accepted handoff, no completion, lease renewal, no transfer) and schema covers all parameters. It does not describe error/edge cases such as nonexistent or already-completed handoffs, but this is acceptable for a compact tool description.

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 already covers all parameters (100% coverage) with descriptions, so the description need not repeat them. It adds only the general notion of 'progress,' which is not required given the schema coverage.

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 ('Publishes progress') and resource ('an accepted handoff'), and immediately distinguishes itself with 'without completing it' and 'without transferring ownership,' making it clearly distinct from sibling tools like vault_complete_handoff.

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 clearly implies the scenario: checkpoint progress on an accepted handoff while explicitly excluding completion. It also explains the lease-renewal effect, but it never names sibling tools or states 'use this instead of X,' so it stops short of fully explicit guidance.

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