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

Annotations already declare destructiveHint=true, idempotentHint=true, openWorldHint=true and readOnlyHint=false, so the mutation/safety profile is known structurally. The description adds useful behavioral context — the lead lands in the target agent's queue — but does not say what happens to the previous owner's claim, whether the previous owner is notified, or what authorization is required for a destructive reassignment.

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 action and its effect; nothing is padded. The trailing 'PATCH /leads/{id}/delegate' is marginally useful implementation detail but earns little for an agent choosing a tool.

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 two-parameter mutation with full schema coverage and rich annotations, the description covers the action and its user-visible consequence, which is close to sufficient. Gaps remain: the 'claim' case mentioned in the title is never explained, and the impact on the current owner of the lead is unstated.

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 both lead_id and delegate_to are documented in the schema itself. The description's 'identified by user id or email' merely restates the delegate_to schema description and adds no format, constraint, or edge-case detail beyond it.

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 names a specific verb+resource ('Give the claim on a lead to a user') and states the observable effect (the lead appears in that agent's queue), which is more than the title alone provides. It does not, however, distinguish this from siblings like myphoner_move_lead or myphoner_update_lead, nor does it explain the 'claim' half of the title (delegating to oneself).

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 reassigning lead ownership, but there is no explicit when-to-use guidance, no mention of when to prefer move_lead or update_lead, and no prerequisites or exclusions stated.

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