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

With no annotations provided, the description carries full burden for behavioral disclosure. While it mentions the outcome ('user pays only half the gross hourly rate via SEPA'), it doesn't describe what happens during enrollment, whether this is a one-time or reversible action, what permissions are needed, or what the response looks like. For a complex enrollment tool with 12 parameters, this is insufficient behavioral context.

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?

The description is appropriately concise with three sentences that each add value: purpose, outcome, and requirements. It's front-loaded with the main action and efficiently structured, though the requirement list could be slightly more organized.

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 complex enrollment tool with 12 parameters, no annotations, and no output schema, the description is incomplete. It doesn't explain the enrollment process, potential errors, response format, or how the various identity parameters relate to each other. The agent would struggle to understand the full context of this operation.

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?

With only 8% schema description coverage, the description compensates by listing key required parameters ('full identity, birth place, postal address, IBAN') and connecting bookingToken to create_booking. It provides meaningful context about what data is needed for enrollment, though it doesn't cover all 12 parameters or explain their relationships.

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 clearly states the specific action ('Enroll the end user with URSSAF for the 50% immediate tax credit advance'), identifies the resource (end user's tax credit enrollment), and distinguishes from siblings by mentioning a prerequisite from create_booking. It provides concrete purpose beyond just the tool name.

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?

The description explicitly states when to use this tool ('After this succeeds, the user pays only half the gross hourly rate via SEPA') and mentions a required prerequisite ('Required: bookingToken from create_booking'). However, it doesn't specify when NOT to use it or mention alternatives among sibling tools, keeping it at a 4 rather than a perfect 5.

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