Room MCP

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It successfully describes key behavioral traits: the synchronous nature ('automatically wait for the response'), error handling ('inform if the peer has left'), and that it's a communication action rather than a read operation. It doesn't cover rate limits, authentication needs, or what specific response format to expect.

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?

The description is extremely concise at just two clauses, with zero wasted words. The first clause states the core purpose, and the second adds crucial behavioral context about waiting and error conditions. Every element earns its place, making it efficiently front-loaded with essential information.

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?

Given no annotations, no output schema, and 0% schema description coverage for a 2-parameter tool, the description provides adequate basic purpose and behavioral context but leaves significant gaps. It explains what the tool does and its synchronous nature but doesn't document parameters, return values, error conditions beyond peer absence, or integration with sibling tools. For a messaging tool in a room system, this is minimally viable but incomplete.

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 schema description coverage is 0%, meaning neither parameter has any documentation in the schema. The description provides no information about what 'roomId' represents (format, how to obtain it) or what 'message' should contain (content type, length limits). For a tool with 2 required parameters and zero schema documentation, this is a significant gap that the description fails to address.

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 clearly states the action ('send a message') and target ('to a room'), making the purpose immediately understandable. It distinguishes itself from siblings like 'create-room-as-host' or 'exit-room' by focusing on messaging rather than room management. However, it doesn't explicitly differentiate from potential messaging alternatives that might exist in the broader system.

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 context by mentioning 'wait for the response' and 'peer has left', suggesting this is for synchronous communication in active rooms. However, it provides no explicit guidance on when to use this versus alternatives like 'wait-for-room-response', nor does it mention prerequisites like needing to be in a room first or having proper permissions.

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