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

No annotations are provided, so the description carries the disclosure burden. It's a read-only limits lookup; 'base + purchased extra slots' hints at what's returned, but it doesn't state the shape, whether limits are per-workspace, or what happens when the limit is exceeded (does create_agent fail?). Adequate but thin for an annotation-free tool.

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 and skimmable. No filler. Slightly informal with the embedded question quote, but tight.

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?

No output schema and no annotations, so the description must cover behavioral and return aspects. It gives the use case but not what the response contains (e.g., fields, current vs. max, unless output schema covers it). Just enough to call, not enough to depend on the result.

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?

Zero parameters, so the baseline is 4. No parameter detail is needed and none is given; nothing is misrepresented.

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 the resource differently: 'base + purchased extra agent slots' clarifies that the tool returns both the plan allowance and any add-on slots. However, it never states the actual verb (it's implied 'get limits') and doesn't distinguish from the near-identical sibling get_agent_plan_limits. An agent could confuse which of the two returns which limits.

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?

Explicitly says when to use it — 'check "can I create another agent?" before calling create_agent' — and names the triggering sibling. That is a concrete pre-flight check use case, not vague guidance.

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