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

The readOnlyHint annotation already declares this is a safe read, so the description's 'read-only observability' note is largely reinforcing. It adds a useful scope boundary (no transfers created on this server), but discloses nothing about pagination flow or result characteristics beyond what the annotations and schema already cover.

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?

Front-loaded with the core action, then scope boundary and API endpoint in terse clauses. Every fragment carries information; nothing is padded.

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?

No output schema exists, but for a simple filtered-list tool with fully documented parameters and a readOnly annotation, the description covers what an agent needs. Return shape and pagination mechanics are the only unaddressed items, and those are minor here.

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 limit, cursor, and account_id are fully documented in the schema. The description's 'Filter by account' merely signals the account_id filter and adds no syntax or format detail beyond the schema, which is the expected baseline.

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 (List) and resource (Real-Time Payments transfers) and expands the RTP acronym. This clearly distinguishes it from the many sibling list tools (wire, ACH, check, card transfers), so an agent can select it without opening the schema.

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 implies usage ('Filter by account') and clarifies the boundary ('this server does NOT create transfers'), but it never states when to prefer this over sibling list tools or what prerequisites exist. Usage context is implied rather than explicit.

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