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

Annotations declare readOnlyHint=true, and the description is consistent with that, adding valuable context the annotations cannot convey: no payment is taken here, notes are reviewed before going up, and rejected notes are refunded. It does not disclose how long the payment link is valid, whether it is single-use, or what the tool returns for an invalid note other than the refund statement.

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?

Three short sentences, front-loaded with what the tool does, then the most important disambiguation (no payment taken), then the review/refund policy. Every sentence earns its place with no repetition of schema content.

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?

With no output schema, the description correctly identifies the return value as a Stripe payment link, and it covers the moderation and refund behavior that would otherwise be invisible. Minor gaps remain around link validity and failure modes, but nothing essential to calling it is missing.

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 name, note, and color are all already documented with length and word constraints and an enum default. The description adds nothing about the parameters themselves, so the baseline 3 applies.

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 resource: checks a note for the Tack Board and returns the $3 Stripe payment link. It also pre-empts a likely misreading of the name 'pin_tack' by clarifying that it does not itself post or take payment. There is no explicit differentiation from siblings, but check_site, live_numbers, and request_redesign are unrelated enough that this is not a real ambiguity.

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 implied rather than stated: an agent can infer it should call this when it has a name and note to submit, before payment. There is no explicit 'use this when' clause, no stated prerequisites, and no guidance on what to do with the returned link or what to do if a note is rejected beyond the refund remark.

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