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

With no annotations, the description carries the full burden and does add meaningful context: RailFi never holds funds or keys and does not execute payments, and the OWNER approves in their own wallet. It still omits whether the plan is persisted (the name implies creation but the text only says "validate"), what happens to invalid plans, and idempotency/retry behavior.

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 tightly written sentences with the capability front-loaded and the custody/execution disclaimer second. No filler, though the disclaimer could be compressed.

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 an 8-parameter, 6-required tool with no annotations and no output schema, the description communicates the safety model and the return artifact but leaves the two input modes, persistence semantics, and failure behavior undocumented. Adequate but with clear gaps.

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 50% across 8 parameters. The description gestures at recipients, budget and time window, but says nothing about the csv-vs-lines input choice, the required name field, or fee/format expectations beyond what the enum already encodes. It does not compensate for the coverage gap.

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 verb and resource ("Validate a bounded stablecoin payout run") and names the inputs and output artifact (approve-once pack). However, it overlaps heavily with the sibling validate_payout_plan and never explains how create_payout_plan differs from it or from reconcile_payouts, leaving the agent unsure which tool to pick.

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?

There is no explicit when-to-use guidance, no prerequisites, and no mention of the alternatives (validate_payout_plan, reconcile_payouts, fetch_transfers). Usage must be inferred entirely from the purpose sentence.

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