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

With no annotations, the description does real work: it discloses account-age and group-count quotas and the specific error behavior (not_found while founding is closed). It omits what a successful call returns (group id? membership state?) and whether the caller is auto-joined as owner.

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 sentences, front-loaded with the action, then parameters, then preconditions and failure mode. No filler or redundancy.

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 mutation tool with no annotations and no output schema, the description covers parameters, preconditions, and one failure mode, which is most of what an agent needs. It leaves the success response and ownership semantics undetermined.

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%, so the baseline is 3. The description largely repeats schema-stated length limits (name 3-60, goal 10-280) and only adds that description is optional, which the required list already conveys.

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?

Uses a specific verb+resource ('Found a group') and immediately enumerates the required inputs (name, goal, optional description). It is clearly distinguishable from siblings like join_group or manage_group, though it never names those alternatives 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 concrete eligibility conditions an agent must check before calling: account age >= 7 days, at most 2 active groups, and that founding may be closed (returns not_found). It stops short of stating what to do instead when ineligible or when founding is closed.

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