create_region_tool

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

With no annotations provided, the description carries the full burden of behavioral disclosure, but it only mentions what the tool does without detailing side effects, prerequisites, or return values. There is no indication of whether creation is idempotent, what happens on invalid input, or whether it modifies persistent state. This is a significant gap for a creation 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?

The description is concise, with two sentences that front-load the core purpose and then provide level semantics. Every sentence contributes meaningful information, and there is no redundant filler.

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 tool has 6 parameters, 1 required, no output schema, and no annotations, yet the description only covers the 'level' parameter semantics. It leaves out crucial context such as how to combine parameters for each level, any error conditions, and what the function returns. For a tool with this complexity, the description is incomplete.

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 description coverage is 0%, so the description must compensate. It explains the meaning of each 'level' value, which partially clarifies the relevance of funcName, className, and lineStart/lineEnd, but it does not explicitly map levels to parameter names or state whether lineStart/lineEnd are both required for 'lines'. The required filePath parameter is not mentioned at all, leaving some parameters underspecified.

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 tool's function: creating a region identifier for a code location. It specifies valid level values, which distinguishes it from sibling tools like parse_region_tool or get_region_metrics_tool. The verb 'create' plus the resource 'region identifier' is specific and unambiguous.

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 gives implicit guidance on when to use this tool (whenever a region identifier is needed), but it does not explicitly distinguish it from alternatives or state when not to use it. The level-specific instructions are more about parameter selection than tool selection, so usage context is only implied rather than fully elaborated.

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