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Update Theme

update_theme
DestructiveIdempotent

Modify theme settings like colors, fonts, and custom HTML in LightCMS. Update specific fields without affecting other settings, with automatic content regeneration when header or footer HTML changes.

Instructions

Update theme settings. Only the fields you provide are changed — all other settings are preserved (partial update, safe to call without get_theme first).

Changing header_html or footer_html triggers background regeneration of all published pages. Changing colors, fonts, or custom_css does NOT require content regeneration.

Use pin_theme_version to protect important milestones before making major changes.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
logo_urlNoLogo image URL
head_htmlNoCustom HTML for <head> section
site_nameNoSite name
custom_cssNoAdditional custom CSS
text_colorNoText color (hex)
font_familyNoBody font family CSS value
footer_htmlNoCustom footer HTML (changing regenerates all content)
header_htmlNoCustom header HTML (changing regenerates all content)
accent_colorNoAccent theme color (hex)
heading_fontNoHeading font family CSS value
site_taglineNoSite tagline
border_radiusNoBorder radius CSS value
primary_colorNoPrimary theme color (hex)
secondary_colorNoSecondary theme color (hex)
background_colorNoBackground color (hex)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv4.2.0

TDQS

A4.7/5.0
Behavior4/5

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

Adds critical side-effect details beyond annotations: header_html/footer_html trigger background regeneration of all published pages while colors/fonts/custom_css do not, and clarifies partial update semantics. Annotations declare idempotent/destructive hints; description adds regeneration timing and scope.

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?

Three tightly structured paragraphs: partial update semantics upfront, regeneration behavior specifics in middle, workflow recommendation at end. No redundancy with schema or annotations.

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

Completeness5/5

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

Comprehensive for a 15-parameter mutation tool: covers mutation type (partial), side effects (regeneration), sibling interactions (get_theme, pin_theme_version), and safety profile. With 100% schema coverage and annotations present, no output schema needed in description.

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 has 100% coverage establishing baseline 3. Description adds semantic value by grouping specific parameters (header_html/footer_html vs colors/fonts/custom_css) by their regeneration behavior, explaining operational significance of modifying each group.

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?

Specific verb 'Update' with resource 'theme settings', clearly distinguishes from sibling get_theme by noting 'safe to call without get_theme first', and differentiates from pin_theme_version by explaining this performs the update while that protects milestones.

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

Usage Guidelines5/5

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

Explicit prerequisites ('safe to call without get_theme first'), clear workflow guidance ('Use pin_theme_version to protect important milestones before making major changes'), and behavioral conditions for regeneration provide clear when-to-use guidance.

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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