Connect DG-LAB relay

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

Annotations indicate idempotentHint=true and safe read-like behavior (destructiveHint=false), and the description reinforces this by stating it is safe to call again to fetch pairing info. It also reveals a behavioral trait beyond annotations: it returns a QR code and link for pairing. No contradictions found.

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 concise and well-structured, front-loading the core action and outputs. Each sentence adds useful information: what it does, what it returns, how to use it, and that it is idempotent. No redundant phrases.

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 tool with no parameters and no output schema, the description is quite complete. It specifies the outputs, the pairing method, and the safe re-call property. A minor gap is not describing what the 'app socket URL' or 'session link' are used for in detail, but the core calling context is fully covered.

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 tool has zero parameters, so schema coverage is complete (100%). The description adds value by explaining what the session setup entails and what outputs are delivered, which is meaningful despite the absence of parameters.

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 tool's function: start or reuse a DG-LAB 4 V4 relay session and return pairing information. It explicitly lists the outputs (QR code, app socket URL, session link) and distinguishes this from an ordinary connect action by noting it is safe to call again.

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: call to initiate pairing or fetch existing pairing info. It does not explicitly contrast with sibling tools, but the context is clear. No alternative tools are named, so it lacks explicit exclusions but still provides sufficient guidance for typical use.

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