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

Annotations only declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so the description adds genuinely new context: the data is relayed to a human operator and must be scrubbed of personal/conversation data. It stops short of describing limits or what a receipt means, but the recipient and privacy constraints are real behavioral disclosures.

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?

Two short sentences with no filler; the recipient is front-loaded before the content restrictions. Wording is slightly indirect ('This content is sent to...'), but nothing is wasted.

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 5-parameter write tool with no output schema, the description covers the essentials an agent needs: who receives the payload and what must not be included. The enum and optional fields are fully explained in the schema, so no critical gap remains.

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 the schema already documents 'kind', 'text', 'about', 'model' and 'client' with examples and constraints. The description only reinforces the text-privacy rule and adds no syntax or format detail beyond the schema, so 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?

The description conveys a specific action and destination: the supplied content is sent to the headlesson operator, and it clarifies the content is feedback about headlesson itself. It is clear enough to distinguish this submission tool from retrieval siblings (headlesson_get, headlesson_search, headlesson_whats_new), though it never names those siblings or states the verb 'send' directly.

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?

It states when the tool applies ('Feedback about headlesson itself is sufficient') and imposes content exclusions (no personal information, no conversation contents). It does not name alternatives or explain when to prefer another tool, keeping it short of a 5.

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