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

With no annotations provided, the description carries the burden of disclosing side effects and call behavior. It adds some transparency by flagging LOW_WRITE and noting the endpoint keying by email, which is meaningful context. However, it does not explain what `confirm` does, whether certain transitions require confirmation, or what the response looks like.

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?

The description is tight and front-loaded, with the status vocabulary and keying note adding real value without padding. The formatting is serviceable, though the note block could be slightly more polished. No wasted sentences.

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 4-parameter mutation tool with no annotations, no output schema, and 0% schema descriptions, the description covers only the two required parameters. The role of `confirm` and `campaign_id` is left entirely to guesswork, and there is no indication of success/failure feedback. This is incomplete for safe invocation.

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 for all parameter meaning. It fully documents `status` by providing the accepted label set and the raw int range, and it explains why `lead_email` is used instead of a lead id. The optional `confirm` and `campaign_id` parameters remain unexplained, keeping this from a 5.

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 opening sentence 'Set a lead's interest status' names a specific verb and resource, making the core purpose clear. It goes on to enumerate the valid status labels, which sharpens the intent. It does not explicitly distinguish itself from the sibling update_lead, so it stops short of a 5.

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 provides a useful operational note — the endpoint is keyed by lead_email rather than lead id — but it does not say when to choose this tool over update_lead or other lead-related siblings. No explicit when-to-use or exclusions are present, leaving the agent to infer the context from the name.

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