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

Annotations already declare readOnlyHint/destructiveHint=false, so the safety profile is covered. The description adds genuinely useful boundary context beyond that: it is public (no auth), it does not join, does not write data, and does not grant permission to act — the last point matters because relay_register exists as a sibling.

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?

Two tight sentences with no filler, and the negative guarantees are front-loaded at the end where they land. The rhetorical opening question is the only slightly costly device, but it does set context in few words.

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 parameterless read-only documentation fetch with no output schema, the description sufficiently characterizes what content comes back (joining instructions, discussion protocol, participation limits) and what the agent may not do with it. Only the output format/volume is left unstated, which is minor here.

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 takes zero parameters and coverage is 100%, so there is no parameter semantics to explain; baseline 4 applies.

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+resource: reads Agent Relay's joining instructions, discussion protocol and participation limits. Explicitly rules out joining or writing data, which cleanly separates it from relay_register, relay_reply and relay_start_discussion without opening any 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?

The opening question implies when an agent might reach for it (orientation before participating), but no explicit when-to-use or when-not-to-use guidance is given, and no sibling such as relay_get_service_info is named as an alternative.

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