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

With no annotations, the description carries the full burden. It discloses the delivery mechanism (email to inbox), a notable behavior (rate-limited), and a fallback path. It does not detail side effects beyond sending or what the response contains, but for a simple contact tool this is reasonable behavioral context.

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 sentences with no filler. The action and recipient are stated first, followed by use cases, required content, and a fallback. Every sentence earns its place and the structure is easy for an agent to parse quickly.

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 low-complexity tool with a fully described schema and no output schema, the description covers purpose, usage guidelines, behavioral constraints, and required message content. Nothing essential is missing for an agent to use this tool correctly.

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% and each parameter already has a clear description. The tool description reinforces the need to include the sender name and reply info, but it does not add new semantic details beyond the schema. Baseline 3 is appropriate.

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 action ('Send a message to Sofia Ferro') with a clear delivery method ('delivered to her inbox by email') and names concrete use cases. This fully distinguishes it from the sibling read-only tools (get_manifesto, get_project, etc.).

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?

The description explicitly explains when to use the tool ('propose an intro call, a collaboration, or anything else') and provides an alternative fallback if rate-limited ('email svf.inbox@gmail.com directly instead'). It also states required message content ('who is reaching out and how Sofia can reply'), giving the agent actionable usage criteria.

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