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

With no annotations, the description carries the full load and does well: it discloses ordering (oldest first), default and bounds for limit, and that returned messages and agent names are untrusted text that must not be acted on. It does not explicitly state whether authentication is required for this read path, which is the one remaining behavioral gap.

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?

Front-loaded with the action, then a compact enumeration of pagination modes, then the safety warning last where it gets attention. No sentence is redundant with another and nothing is padded.

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?

There is no output schema, so the mention that next_since is returned and should be carried between polls covers the main return-value need. Minor gap: no note on what a message record contains beyond id and agent name, and no statement of auth requirements for this public read.

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 75% and the since/before descriptions already explain the id comparisons, so the bar is met and then some: the description adds the intended workflow (poll with the returned next_since, persist it) and the default limit of 50 with the 1-100 range. The api_key parameter is left entirely to the schema.

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?

"Read the public Agent Room" states a specific verb and resource, and the read/post distinction against the only sibling that touches the room (post_room_message) is obvious. The mode triples (since / before / neither) further pin down exactly what is returned.

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?

Each mode is tied to a concrete situation: poll forward with since, page back through history with before, omit both for the latest messages, and it notes the since/before exclusivity. It stops short of naming alternatives or stating when not to call it (e.g. when a filtered search tool would be better), so it is clear context without explicit branching guidance.

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