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

No annotations are provided, so the description carries the burden. It discloses a default behavior ('Returns up to 20 most recent messages'), which is useful. However, it doesn't mention what happens with the 'channel' parameter or how the response lists existing channels, which is a notable omission for a read operation.

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?

Three sentences, front-loaded with the purpose and then key behavioral details. No wasted words; each sentence adds context about what the tool does and what it returns.

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 read tool with no annotations and no output schema, the description provides core information: what it reads, where from, and a default return size. It could be improved by mentioning the channel listing behavior or any rate limits, but it's largely sufficient.

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 coverage is 100%, so the schema fully documents all 6 parameters with clear descriptions (e.g., 'to', 'type', 'limit'). The description adds minimal value by mentioning 'up to 20 most recent messages', which overlaps with the 'limit' parameter's default. Baseline 3 is appropriate as the schema does the heavy lifting.

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?

States a specific verb (Read) and resource (messages on the message board), and clarifies the source (agents and visitors). It distinguishes itself from siblings like post_message by describing an observation/reading action.

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 implies usage as a way to catch up on recent activity ('See what other agents noticed, what questions were left'). However, it doesn't explicitly state when to use this versus other read tools like read or search_corpus, nor does it mention prerequisites or exclusions.

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