set_clip_loop

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

Annotations already indicate idempotentHint=true and destructiveHint=false. The description adds behavioral details: 'omitted fields stay unchanged', 'end must be after start', and clarifies the role of each parameter. No contradictions.

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?

Two concise sentences with front-loaded purpose, followed by usage rule, parameter explanations, and sibling differentiation. Every sentence adds value.

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?

Given the output schema exists (though not shown) and annotations are present, the description covers purpose, usage, parameter semantics, and alternatives. It could explicitly mention required fields (track_index, clip_index) but schema covers them.

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% with basic descriptions. The description adds meaningful context: start/end are 'loop-brace positions in clip-relative beats', start_marker controls 'non-looped launch beginning', looping enables/disables repetition. This goes beyond 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 states a specific verb ('Update') and resource ('selected loop and launch markers on one existing Session clip'). It clearly distinguishes from sibling tools like set_loop (global loop) and get_clip_info (inspection).

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?

Explicitly tells when to use this tool vs alternatives: 'Use set_loop for the Arrangement's global loop region, not a clip, and get_clip_info to inspect current values.' Also advises to provide at least one optional field.

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