send_newsletter

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

With no annotations, the description carries the full burden for an irreversible outbound action. It usefully discloses the confirm gate and that credentials come from env vars only, but says nothing about irreversibility, recipient scoping, rate limits, or what happens on partial failure, which are the key risks for a send operation.

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?

Four short sentences, front-loaded with the action and then the hard prerequisite. It is dense and free of filler, though the telegraphic style ('keys come from env vars only') borders on terse note-taking rather than guidance.

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 irreversible 7-parameter mutation with no annotations and no output schema, the definition leaves too much unsaid: required seed_id is never defined, recipient resolution is unaddressed, and there is no statement of success/failure 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% across 7 parameters, and the description only touches three (confirm, adapter, test_to_self). The required seed_id, plus to, subject, and draft, are left completely unexplained, including the critical question of who receives the mail when to is omitted.

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 ('Send the rendered newsletter') and names the two delivery paths (Resend or SMTP). It does not explicitly contrast with siblings like render_outputs or approve_draft, but the send action is unambiguous.

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 one hard precondition (confirm=true) and one usage mode (test_to_self uses owner.email), which implies a safe testing path before a real send. It does not say when to choose Resend vs SMTP, nor when not to send (e.g., draft not yet ready or approved).

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