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update_text_style

Modify the font size, color, alignment, bold, and italic settings of an existing text overlay in a CapCut project.

Instructions

Update the styling of an existing text overlay.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
boldNoSet bold style (optional).
colorNoNew text color hex (optional).
italicNoSet italic style (optional).
alignmentNoNew alignment — 0=left, 1=center, 2=right (optional).
font_sizeNoNew font size (optional).
segment_idYesID of the text segment to update (from get_project_info or add_text).
project_nameYesName of the CapCut project.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations provided, description carries full burden but only states 'update styling' without disclosing behavioral traits like destructive nature, overwrite behavior, or required permissions.

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

Conciseness4/5

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

Single clear sentence with no excess, but could be more informative without becoming verbose.

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

Completeness2/5

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

Despite having an output schema, the description lacks crucial context about how updates apply (e.g., partial vs full overwrite), constraints, and prerequisites for a mutation tool with 7 parameters.

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

Parameters3/5

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

Schema description coverage is 100%, so baseline is 3. Description adds no additional meaning beyond the schema's parameter descriptions.

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

Purpose5/5

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

Description uses specific verb 'Update' and resource 'styling of an existing text overlay', clearly distinguishing it from sibling 'update_text_content' which updates text content.

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

Usage Guidelines3/5

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

Description implies use for styling changes versus content changes, but provides no explicit when-to-use, prerequisites, or alternatives.

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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