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

Adds meaningful behavior beyond annotations: the agent never sees the link or taxpayer number, canonicality delegates to the shared backend action, and idempotency instructs obeying the retry key or inspecting refreshed state before retrying. The confirmation-boundary sentence is a generic template dump ('read, reversible save, explicit fact/evidence record, link preparation, plan refresh'), which weakens rather than clarifies the safety profile.

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?

Labeled sections (Prerequisite, Canonicality, Idempotency, Confirmation boundary) front-load well and the first two sentences are tight. The Confirmation boundary sentence is bloated boilerplate listing unrelated action categories, and 'every prerequisite stated above' is a filler referent.

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 no-output-schema, side-effecting send tool with annotations covering read/write and open-world hints, the description supplies prerequisites, visibility constraints, canonicality, and retry policy. The remaining gap is parameter meaning for targetId and companyId, which no other structured field covers.

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?

With 0% schema description coverage, the description must carry the parameter burden, and it only partly does. It maps the purpose enum values implicitly by naming Form 8822-B and 83(b), but never explains what targetId refers to (responsible party vs. stockholder) or what companyId scoping means.

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: sending a fresh one-time secure taxpayer-number link, scoped to the responsible party or new stockholder, and tied to expired Form 8822-B or 83(b) links. It does not, however, distinguish itself from near-neighbors like prepare_83b_tin_input or nudge_signer, so an agent must infer the boundary.

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 a clear triggering condition (an earlier link expired), which is real usage guidance. But the prerequisite sentence trails off into 'plus every prerequisite stated above,' an unresolvable reference to injected context, and no alternative tool or when-not-to-use case is named.

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