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

No annotations are supplied, so the description bears the full disclosure burden and largely fails it. It does not say whether marking done is reversible, what permissions or session state are required, what happens to a task already marked done, or what the call returns.

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?

It is a single short sentence with the verb and resource front-loaded, which is good. The trailing rationale clause is ambiguous and does not earn its place, since it neither clarifies behavior nor routes the agent between siblings.

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 four-required-parameter mutation with no annotations and no output schema, the description is far too thin. It leaves the caller guessing at session/project semantics, the role of note, and the consequences of the state change.

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?

All four parameters are required with 0% schema description coverage, and the description explains none of them. "Board task" loosely implies task_id, but project, session, and especially the free-text note are given no meaning or format guidance anywhere.

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 ("mark a board task complete"), so the agent knows the core operation. It does not differentiate from the close sibling "mark_complete", and the trailing clause "because the code already does it" muddies rather than sharpens the purpose.

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 clause "because the code already does it" gestures at a precondition but never states it plainly: it is unclear whether the tool should only be called when the work is already implemented, or whether that is merely a rationale. No when-not guidance or comparison with "mark_complete" or "audit_done" is given.

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