Set cut start/end

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

Annotations only declare that it is not read-only, not destructive, and not open-world. The description adds genuinely useful behavior beyond that: it discloses that it performs seeks as a side effect and that a new segment is created when the playhead lies past the current segment. It still does not say what happens to an already-set start/end or what is returned, keeping it short of a 5.

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 tight sentences with the primary action front-loaded and the edge-case behavior second. Nothing is padded, though the quoted UI action names consume space without adding agent-relevant meaning.

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?

For a two-optional-parameter mutator with no output schema, the description covers the core action and one important side effect. It is still silent on return value, on whether both bounds can be set in one call and in what order they are applied, and on the state the tool assumes (open file, existing segment).

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 reported as 0% at the property level, so per the rubric the description must compensate. It only echoes 'start and/or end' and adds nothing about optionality, units, accepted timecode forms, ordering between start and end, or what happens if only one is supplied; the only parameter meaning available comes from the anyOf branches in the raw 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?

States a specific verb and resource ('sets the start and/or end of the current segment') and explains the mechanism (seek then press 'set cut start'/'set cut end'). It is distinguishable from set_segments and add_segment by the word 'current segment', though it never names those siblings explicitly.

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?

Usage is implied: adjust the boundary of the segment you are currently on. There is no explicit 'use this instead of set_segments/add_segment when...' guidance, and no statement of prerequisites such as a file being open or a segment existing. The note about the playhead being after the segment implicitly warns about an out-of-scope call but is not framed as guidance.

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