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

Beyond the annotations it adds real behavioral context: the note is created once, is not a tenant message, and is never retried automatically — this reinforces the idempotentHint=false and tells the agent not to assume retry safety. It does not describe permissions or the response, keeping it shy of a 5.

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 WRITE marker and the core action, then the HTTP endpoint, then the caveats. Nothing is padding, though the raw endpoint path is of limited use to an agent.

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 3-param mutation with no output schema, it covers purpose, confirmation, and non-retry semantics but leaves the tags parameter entirely unexplained. Adequate overall, with one clear gap an agent would hit when deciding how to populate tags.

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 only 33% — task_id is documented but content and tags are not. The description mentions adding a 'note' (loosely implying content) but says nothing about the tags array or content limits, so it fails to compensate for the coverage gap.

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 names a specific verb and resource ('add a note to an existing maintenance task') and prefixes it with 'WRITE:' to signal the operation class. No sibling tool touches task notes, so the agent can distinguish it from the get_/list_ family without inspecting schemas.

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 gives a clear triggering condition ('when the user requests it') and a prerequisite ('Confirm the intended task and note first'), which is actionable pre-call guidance. It stops short of naming an alternative tool or stating when not to use it, but no obvious sibling competes for this job.

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