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

No annotations exist, so the description carries the burden. It discloses the cost (2 USDC), the seller, and the deliverable, but doesn't describe payment mechanics, contract creation, or what happens on success or failure.

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?

One compact sentence with the key facts front-loaded: price, purpose, and what the user can send. 'Sold by Sphere' is slightly extra but not damaging.

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 description of the return value or post-purchase behavior, so an agent cannot know what a successful call yields. For a paid marketplace tool with optional auth paths, this is a meaningful gap.

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 covers all 5 parameters with descriptions, so baseline is 3. The description adds high-level domain context (question, documents) but doesn't map to specific parameters beyond what the schema already provides.

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?

The description names the exact resource (consult_bagira), states the action (buy), and clarifies the service as 'send a question about Sphere or its public knowledge, optionally with documents.' It goes beyond the name, though it still doesn't explicitly separate it from the other buy_* siblings.

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?

No guidance about when to prefer this over other buy_* services or contact_sphere. Usage is only implied by 'question about Sphere', with no exclusions or alternatives.

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