Overwrite From Source

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

Annotations already declare readOnlyHint=false, idempotentHint=false, and destructiveHint=false, so the safety profile is largely covered. The description adds useful beyond-schema context (existing clips get replaced, and a placement verification occurs), but it omits undoability, required permissions, and does not resolve the tension between 'replaces existing clips' and destructiveHint=false.

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?

A single front-loaded sentence whose parenthetical is the highest-value clause. Nothing is wasted, though the trailing 'and verify a new placement' clause is slightly buried.

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?

An output schema exists, so return/verification details need not be spelled out, and annotations carry the read/write profile. The definition is complete enough to invoke correctly, with only the alternative-selection guidance and destructiveness clarification missing.

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 only two optional parameters, both documented in the schema itself (audio/video track index with defaults). The description's phrase 'requested tracks' loosely maps to those parameters but adds no format or default details, so it sits at the baseline.

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+resource+location: 'Overwrite the clip from the Source Monitor at the playhead position,' plus the parenthetical clarifies the edit semantics ('replaces existing clips'). An agent can tell this is an overwrite-style timeline edit. However, it never differentiates from close siblings like overwrite_clip or insert_from_source, so it stops short of full sibling disambiguation.

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?

There is no explicit guidance on when to choose this tool versus insert_from_source (which would ripple rather than replace) or overwrite_clip. The parenthetical describes the mechanism, not the selection criteria, so the agent must infer the when-to-use case from the name alone.

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