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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the description carries a lighter burden and adds real value: the auth model, the absence of a token parameter, and the fact that revocation and member removal take effect immediately. It stops short of describing how 'bounded' and 'recent' are actually limited (result caps, pagination), which would matter for a read tool.

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 tight sentences with no filler, and the core capability is front-loaded before the constraints. The final sentence about revocation is somewhat tacked on but still earns its place as behavioral context.

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-only tool with full annotation coverage and no output schema, the description covers purpose, auth, and scope exclusions well. The remaining gap is the roomId value format, which is left entirely to the schema pattern and is easy for an agent to miss.

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?

The single required parameter, roomId, has zero schema description coverage; the schema only supplies a pattern and maxLength. The description never explains that roomId accepts either the literal 'internet' or a 36-character UUID, so it fails to compensate for the coverage gap on the one parameter that matters.

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?

Specific verb (read) with an enumerated resource set (room metadata, tool titles, recent messages, versions) and an explicit scope qualifier ('bounded'). The negative clauses ('No token argument, room enumeration, AI execution or edits') further delineate it from the sibling read_connection_guide, so an agent can distinguish the two without opening a schema.

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 states the precondition clearly: the caller must use an Authorization: Bearer header carrying the room-scoped agent token issued by a member, and it explicitly excludes token-passing as an argument. Exclusions for enumeration, AI execution, and edits tell the agent when NOT to reach for this tool, though it never names an alternative tool.

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