midpoint_calc

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

No annotations are provided, so the description carries the burden. It describes the operation as a simple calculation with no side effects, but does not disclose any behavioral traits like error handling, permissions, or rate limits. For a straightforward math tool, this is adequate but lacks additional depth.

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 concise and well-structured, with a one-line summary followed by a list of parameters. However, repeating parameter documentation in the description slightly reduces conciseness.

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?

The output schema exists, so the description does not need to explain return values. However, the description could mention the output format briefly for clarity. It is complete enough for a simple tool but lacks mention of edge cases or result structure.

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?

The description adds parameter descriptions (e.g., 'x1 — X coordinate of first point.') that are not present in the schema (0% schema description coverage). This provides clear meaning beyond the parameter names and types.

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 'Calculate the midpoint between two points in 2D space.' This is a specific verb-resource combination, accurately describing the tool's function and distinguishing it from sibling tools like 'calculate_distance' or 'slope_calc'.

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 is given on when to use this tool versus alternatives. It does not mention when not to use it or provide context for selection among similar calculation tools.

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