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leancoderkavy

Premiere Pro MCP Server

Set Start Time

set_start_time

Set the start time offset for a project item in seconds to define its timeline position and synchronize clips accurately.

Instructions

Set the start time (timecode offset) for a project item

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
item_idYesNode ID or name of the project item
start_secondsYesStart time in seconds

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
okYesWhether the tool completed successfully.
dataNoTool-specific result data when ok is true.
toolYesThe registered MCP tool name.
errorNoFailure detail when ok is false.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changedv1.14.4
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
      +  "$schema": "https://json-schema.org/draft/2020-12/schema",
      +  "additionalProperties": false,
      +  "properties": {
      +    "data": {
      +      "description": "Tool-specific result data when ok is true."
      +    },
      +    "error": {
      +      "description": "Failure detail when ok is false.",
      +      "type": "string"
      +    },
      +    "ok": {
      +      "description": "Whether the tool completed successfully.",
      +      "type": "boolean"
      +    },
      +    "tool": {
      +      "description": "The registered MCP tool name.",
      +      "minLength": 1,
      +      "type": "string"
      +    }
      +  },
      +  "required": [
      +    "ok",
      +    "tool"
      +  ],
      +  "type": "object"
      +}
  2. Changed1 schema field changedv1.4.0
    • removedInput schema / additionalProperties
      Removed value: -false
  3. Addedv1.1.5
  4. Removedv1.1.5
  5. First observedv1.1.1

TDQS

B3.4/5.0
Behavior3/5

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

Annotations already convey readOnlyHint=false, idempotentHint=false, and destructiveHint=false, so the bar for added behavioral context is lower. The description adds some useful context by specifying 'timecode offset' and restricting the target to 'project item', but it does not mention overwrite behavior, side effects, or preconditions.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single focused sentence with the verb and object front-loaded, and the clarifying 'timecode offset' phrase is included without redundancy. It contains no unnecessary words or repeated schema content.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple two-parameter setter with full schema coverage, annotations, and an output schema, the description is nearly adequate. However, it lacks sibling guidance, especially versus set_clip_start_time, and gives no indication of valid ranges or overwrite semantics, so an agent might select it incorrectly or call it with invalid values.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the baseline is 3. The description adds meaning beyond the schema by clarifying that start time means 'timecode offset', a nuance not present in the schema's 'Start time in seconds' description. No other parameter-level detail is added, hence not a 5.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states a concrete action ('Set') and a specific resource ('start time (timecode offset)' for a 'project item'). However, it does not explicitly distinguish itself from similarly named siblings like set_clip_start_time, so it stops short of the differentiating clarity needed for a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance about when to use this tool versus set_clip_start_time, set_playhead_position, or other timing-related siblings. The description only restates the core function and gives no prerequisites, exclusions, or alternative selection hints.

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

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