create_region

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

With no annotations, the description carries the burden of disclosing behavior. It explains that times are in seconds and measures use 'measure:beat,fraction', and hints that start_time/end_time are optional if the corresponding measure is provided. However, it does not clarify behavior when both time and measure are supplied, or what happens if neither is provided.

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 compact and front-loaded with the core purpose, followed by a structured Args list. It avoids unnecessary prose, though the parameter list duplicates schema field names in a way that is acceptable but not minimal.

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 5 parameters, no annotations, and no schema descriptions. The description covers the parameters well and provides an output schema, so return values are not needed. However, it lacks explicit guidance on tool selection and leaves some ambiguity around the exact start/end position requirements, making it slightly 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%, and the description compensates by adding units ('seconds', 'measure:beat,fraction') and dependency information for all five parameters. This is meaningful and goes beyond what the schema provides, though it could be more explicit about constraints.

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 states 'Create a region in the project' with a specific verb and resource. It clearly distinguishes from sibling tools like delete_region and get_region_list.

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 implies usage (creating a region) and provides parameter-level guidance (e.g., 'optional if start_measure is provided'), but it does not explicitly explain when to choose this tool over alternatives or mention any exclusions.

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