Design params json

Skill cxcscmu/SkillLearnBench/skills/b4-skill-creator-claude-sonnet-4-6/anthropic-poster-design/design-params-json

[COLM'26] SkillLearnBench is the first benchmark for evaluating continual learning methods that automatically generate agent skills.

Install

npx -y skills add cxcscmu/SkillLearnBench --skill design-params-json

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How to generate a design_parameters.json file containing the applied HEX color values and heading font name used in a branded poster or artifact. Use this skill whenever a task requires outputting a machine-readable record of design tokens alongside a visual output. Triggers on: "design_parameters.json", "design parameters", "applied hex values", "color parameters json", "brand token json output".

SKILL.md

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Design Parameters JSON Output

Purpose

After generating a branded visual artifact, output a companion JSON file that records every applied design token so engineers can reproduce or audit the styling.

Required JSON Structure

The file must use exactly these keys (no additions, no renames):

{
  "background_hex": "",
  "corporate_dark_hex": "",
  "primary_accent_hex": "",
  "secondary_accent_hex": "",
  "tertiary_accent_hex": "",
  "muted_mid_gray_hex": "",
  "applied_heading_font": ""
}

Population Rules

Key	Value source
`background_hex`	Color used for the poster/page background
`corporate_dark_hex`	Color used for the outer casing / dark surfaces
`primary_accent_hex`	Color used for interaction details / highlights
`secondary_accent_hex`	Color used for the Thermal Management Unit
`tertiary_accent_hex`	Color used for the PCB substrate
`muted_mid_gray_hex`	Color used for annotation leader lines
`applied_heading_font`	Exact font family string used in the title block

Python Output Snippet

import json

design_params = {
    "background_hex":      IDENTITY_LIGHT,
    "corporate_dark_hex":  CORPORATE_DARK,
    "primary_accent_hex":  PRIMARY_ACCENT,
    "secondary_accent_hex": SECONDARY_ACCENT,
    "tertiary_accent_hex": TERTIARY_ACCENT,
    "muted_mid_gray_hex":  MUTED_MID_GRAY,
    "applied_heading_font": HEADING_FONT,
}

with open("/root/design_parameters.json", "w") as f:
    json.dump(design_params, f, indent=2)

Validation

All HEX values must start with # and be 7 characters (e.g. #F5F0EB).
Font name must be the exact string passed to fontfamily= in matplotlib.
File must be valid JSON parseable by json.load().

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