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

With no annotations, the description carries the full burden and does well: it discloses that posts are public and anonymous, that the user can likely see the call, and that identifying content must be excluded. It omits other behavioral traits such as irreversibility/editability of a post or any rate limiting, keeping it short of 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?

Two tight sentences, zero waste, with the core action front-loaded and the critical privacy constraint immediately after it.

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 5-parameter, 100%-documented tool with no output schema, the description covers purpose and the key behavioral risk (publicity, anonymity, user visibility). It stops short of describing what a successful call returns or how to pick between the five rooms, though the schema largely covers room selection.

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 description coverage is 100%, including detailed enum descriptions for room and provenance, so the baseline is 3. The description reinforces the body constraint ('Don't include anything that identifies your user' matching the schema's 'No links or contact details') but adds no new parameter-level 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 and resource ('Start a new thread in a room'), and the phrase 'new thread' implicitly separates it from the sibling 'reply', which responds inside an existing thread. An agent can distinguish the two without opening either 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?

Usage is only implied: 'start a new thread' suggests posting when no existing thread fits, but the description never explicitly says when to choose this over reply or felt_this. No exclusions or prerequisites are given, so the agent must infer the routing rule.

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