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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the agent knows this is a contained, non-destructive mutation. The description adds only the "short" framing (consistent with the 500-character cap); it says nothing about whether existing chalkboard content is overwritten, whether the note persists, or who can see it.

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?

One sentence, front-loaded with the action, with no filler or redundancy. Its brevity is efficient, though it leaves essentially no room for the behavioral detail an agent might want.

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 one-parameter tool with full schema coverage and annotations covering the safety profile, the definition is close to sufficient. The missing pieces are whether writes replace prior content and how the note becomes visible to others, which matter in a shared chalkboard context.

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 the single parameter is documented as "Your note." with a maxLength of 500. The phrase "short note" reinforces the size constraint but adds no format, tone, or content guidance beyond the schema; 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?

"Write a short note on the chalkboard" gives a specific verb (write) and resource (chalkboard), and the verb form plainly contrasts with the sibling read_chalkboard. It stops short of explicitly naming or differentiating from other communication-style siblings such as pass_note or tell_teacher.

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?

There is no when-to-use or when-not-to-use guidance. The write/read pairing with read_chalkboard is only implied by the tool name, and nothing tells the agent when this is preferable to other communication siblings in the catalog.

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