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

With no annotations, the description carries the full burden and does real work: it discloses that the call returns a Stripe Checkout url and does not itself complete payment ('The person still confirms and pays'), plus the unit (whole US dollars) and per-type minimums. It omits auth/permission requirements and what happens on repeat calls, so it is not fully exhaustive.

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?

Short, front-loaded sentences with zero filler: identity, return value, payment flow, unit, then the two thresholds. Every sentence adds a fact an agent needs.

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 2-param tool with no output schema and no annotations, the description covers the essentials — what it creates, what it returns, who completes payment, and value constraints. Missing only auth/prerequisite context and error or duplicate-handling behavior.

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 0%, so the description must compensate, and it does for the critical param: 'amount is whole US dollars', one-time minimum $1, monthly minimum $50 — semantics the integer/exclusiveMinimum-0 schema cannot express. The 'type' param is only addressed indirectly through the per-type minimums, relying on the enum to explain itself.

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 ('Start a gift') and resource (donation to Changing Our Futures, with EIN), and adds the returned artifact (Stripe Checkout url). No sibling tool (login, list_donors, personality tools) is even adjacent, so there is no ambiguity to resolve.

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 by the name and the natural reading of the description — there is no explicit 'use this when...' or alternative named. The line 'The person still confirms and pays' does implicitly scope it as the initiate step rather than a completion step, which gives partial guidance.

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