create_connection

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

Without annotations, the description carries full burden. It clearly states it's a WRITE operation, runs setup tests, and returns testing results. It also warns about future required fields and fingerprint details limitations. This provides substantial behavioral context beyond what annotations would offer.

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 reasonably concise, front-loading the critical warning about user confirmation. It uses bullet points for emphasis and includes necessary details without excessive verbosity. Slight redundancy could be trimmed, but still effective.

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 exists, so the description should explain return values more thoroughly. It only says 'returns testing results' without specifying format or fields. Also missing prerequisites (e.g., existing group) and error handling. For a complex creation tool, this is a 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 coverage is 100%, so baseline is 3. The description adds value by explaining that schema_file must be read from a specific path and that request_body is a JSON string. It also gives important notes about destination_schema_names and trust_fingerprints, which are not in the schema.

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 action ('Creates a new connection') and the resource ('within a specified group in your Fivetran account'), with a specific verb and resource. It distinguishes itself from sibling tools like modify_connection or delete_connection.

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 includes a prominent warning to confirm with the user before calling, which is a key usage guideline. It also advises including the destination_schema_names field and setting trust_fingerprints appropriately. However, it does not explicitly compare with alternative tools for when not to use.

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