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thincms_create_preview

Preview draft template or content changes by creating a session with overrides. Obtain a time-limited URL to review without publishing.

Instructions

Create a preview session with draft template or content overrides. Returns a token-based preview URL (valid for 2 hours). Use this to preview CSS/template changes or draft content without publishing.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
siteIdNoOverride the active site for this single call. Pass to target a specific tenant without mutating shared active-site state — the right pattern when running concurrent agent sessions managing different tenants. Must match a siteId from your THINCMS_SITES config (use thincms_list_sites to inspect). When omitted, the call uses the active site set by thincms_switch_site.
pageFrameNoDraft HTML page frame to preview
stylesheetNoDraft CSS to preview
customHeadHtmlNoDraft custom head HTML to preview
contentOverridesNoArray of post/page content overrides to preview
confirmProductionWriteNoAcknowledge that this call may write to a configured production site (THINCMS_PRODUCTION_SITE_IDS env var). Required for any POST/PUT/PATCH/DELETE against a production-listed site; ignored otherwise. The error message lists which site triggered the requirement and recommends thincms_snapshot before any production write.
Behavior3/5

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

No annotations are provided, so the description must carry the burden of behavioral disclosure. It mentions the preview URL is token-based and valid for 2 hours, and implies the operation is non-destructive ('without publishing'). However, it does not disclose whether creating a preview modifies state, idempotency, or any side effects.

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 consists of two sentences that are front-loaded with the primary action. There is no fluff or redundant information.

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

Completeness4/5

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

Given the tool has 6 optional parameters and no output schema, the description provides adequate context: what the tool does, key features (token-based, 2-hour validity), and use case. It could be more complete by mentioning the response format or prerequisites, but it is sufficient overall.

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?

The input schema has 100% parameter description coverage, so the schema already documents each parameter fully. The description adds no additional meaning beyond what is in the schema, so a baseline score of 3 is appropriate.

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?

The description clearly states it creates a preview session with draft template or content overrides and returns a token-based URL. It distinguishes from sibling tools like thincms_get_preview_url (which likely retrieves an existing preview) and thincms_go_live (which publishes).

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

Usage Guidelines4/5

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

The description explicitly says 'Use this to preview CSS/template changes or draft content without publishing,' which gives clear context for when to use the tool. It does not explicitly state when not to use or mention alternatives, but the guidance is sufficient.

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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