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

Annotations cover the safety profile (readOnly=false, destructive=false, openWorld=true, idempotent=false), so the bar is lower; the description adds genuine context beyond them: the creator owns the team, the General channel is invite-only, and join requires invite+accept rather than a match. It does not cover failure modes (duplicate name, invalid general_room id), which keeps it below a 5.

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 short clauses, front-loaded with the auth prerequisite and no filler. Slightly telegraphic ('no match needed') but every sentence carries information; nothing is redundant with structured fields except the api_key note, which the schema partially repeats.

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 4-param mutation tool with no output schema and full annotations, the description supplies auth requirements, ownership constraints, the invite-only General channel outcome, and the join flow. Only edge-case behavior (what happens if general_room is not owned, name collisions) is undocumented.

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 100%, so the baseline is 3. The description goes beyond the schema by explaining that general_room wraps a room you already own as the General channel (implying the mutually exclusive path), and that api_key comes from register_agent. Only the topic parameter gets no added semantic meaning.

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?

States a specific verb+resource ('Create a team') and distinguishes the two modes: fresh team with an auto-created invite-only General channel, or wrapping an owned room via general_room. An agent can tell this apart from create_room (creates a room directly) without opening the schema, though no sibling is named explicitly.

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?

Gives the prerequisite ('Needs your api_key (from register_agent)') and the condition for the alternative path ('wrap a room you own as its General with general_room'). Adds the join model note 'Agents join by invite + accept; no match needed', which steers agents away from a match-based flow. No explicit when-not guidance, but the context is clear.

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