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

With no annotations, the description carries the full burden and does well: it discloses the confirm-gating behaviour (preview vs. execute), the consequence of an incorrect account number, and that the account receives payouts. It stops short of covering permission/auth requirements, whether the previous account is replaced, or any effect on pending earnings.

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 sentences, purpose front-loaded, then the confirmation caveat. The second sentence is dense but every clause earns its place by justifying why the extra confirmation step exists rather than merely asserting it.

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 simple confirm-gated mutation with no output schema, the description covers the highest-risk behaviour (irreversible wrong-account consequences, preview limitation) that an agent most needs. It leaves the return payload of a confirm:true call and the remaining field semantics to inference, which is a modest gap for a five-parameter tool.

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 coverage is only 20% (only 'confirm' is documented), so the description must compensate for four undocumented required fields. It highlights that account number and IFSC are the high-risk values and must match exactly, which is useful emphasis, but adds no format or validation guidance (e.g. IFSC syntax, name-must-match-bank-account rules).

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 a precisely scoped resource: 'Update the coach's own payout bank account'. The 'coach's own payout' framing cleanly separates it from the other self-update siblings (update_my_contact, update_my_professional, update_my_testimonials), and the added stake clause ('this is where Trainzilla sends earnings') removes any ambiguity about what account is being changed.

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 operational precondition: obtain the coach's verbal confirmation of the exact account/IFSC before calling with confirm: true, and warns that the tool's own preview is insufficient. It does not name alternative tools, but no sibling competes for this job, so the guidance is effectively complete on the when/how axis.

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