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

Annotations already declare readOnlyHint=false, idempotentHint=false, and destructiveHint=false, signaling a mutating, non-idempotent operation. The description adds the specific state transition (open to accepted) and the side effect of recording the accepting platform/agent. This covers basic behavior but does not disclose potential errors (e.g., if handoff is not open) or concurrency implications. It is consistent with 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?

A single, direct sentence that front-loads the primary action. No filler, no repetition of the tool name, and the information is efficiently packed. Every word contributes to understanding the tool's purpose.

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 tool with only two parameters and no output schema, the description adequately conveys the core operation. It implies the precondition that the handoff must be open and specifies what is recorded. It does not elaborate on error handling or edge cases, but given the simple nature and existing annotations, it is sufficiently complete for an agent to call it 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?

Schema description coverage is 100%, with clear descriptions for 'id' and 'acceptedBy'. The description adds no new parameter meaning beyond what the schema already states; it simply echoes 'records the accepting platform or agent', which maps directly to acceptedBy. Baseline 3 is appropriate given full 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?

The description states a specific action on a specific resource: changing an open handoff to accepted and recording the accepting party. It distinguishes from siblings like vault_complete_handoff (which likely marks completion) and vault_post_handoff (creation). The verb 'changes' and object 'handoff' are clear.

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 gives no guidance on when to use this tool versus siblings. It does not mention alternatives like vault_complete_handoff or vault_checkpoint_handoff, nor any preconditions beyond 'open handoff' implied by the phrase. An agent must infer usage from the tool name alone.

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