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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the mutation/safety profile is partly covered. The description adds genuinely non-annotated behavior: claims are advisory marks rather than locks, and the addressing rule governs whether an autonomous agent is permitted to act. It stops short of saying what happens if the handoff is already claimed or already closed, which is the remaining behavioral 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?

Three sentences, each carrying distinct load: what the tool does, the concurrency rationale, and the addressing decision rule. The most important action timing ('BEFORE working on it') is front-loaded with zero filler.

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?

There is no output schema, so the description must stand alone for behavior, and it covers purpose, timing, concurrency semantics, and authorization. It is nearly complete; only the outcome of claiming an already-taken or closed handoff is unaddressed, a minor gap given the idempotentHint annotation.

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%: project, handoff, and note are each documented in the schema, including that note names the taker. The description adds no format, handle syntax, or requiredness detail beyond what the schema already provides, so the baseline of 3 is appropriate.

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 ('Mark that you are taking an open handoff') plus the scope constraint ('BEFORE working on it, so parallel sessions do not duplicate it'). It also clarifies the semantics of the operation ('a claim is a mark, never a lock'), which cleanly separates it from siblings like arroway_withdraw, arroway_pass, and arroway_close.

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?

Gives an explicit when ('BEFORE working on it'), a why (avoid duplication across parallel sessions), and a when-not with the deciding authority spelled out: addressed to someone else, only a human in this conversation may take it and an autonomous session must leave it. That is a complete routing rule an agent can act on without inference.

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