Make CopyPromptButton default prompt self-contained again

[dprevoznik]

Summary

• The homepage's copy-prompt button is broken in production with ReferenceError: DEFAULT_PROMPT is not defined, thrown from CopyPromptButton's per-page render.
• Add Foreman integration guide to Vercel section #510 hoisted the button's default prompt text out of the function body into a module-level DEFAULT_PROMPT const so the new Foreman page could override it via props. That constant isn't resolving wherever this snippet gets evaluated per-page, which breaks the homepage's no-props usage while the Foreman page (which always passes an explicit prompt) is unaffected.
• Fix CopyPromptButton crashing when rendered with no props #513 fixed a related but different bug (destructuring a null props object) without touching where DEFAULT_PROMPT lives, so the ReferenceError was still live after that merged.

Fix

Move the default prompt text back inside CopyPromptButton's function body — the same shape it had before #510 — instead of a module-level constant, while keeping the prompt/label override the Foreman page relies on. No more identifier needs to resolve outside the function's own scope.

Test plan

• Read through both call sites (index.mdx homepage, integrations/vercel/foreman.mdx) to confirm the override path still works with only props.prompt set and label on its default.
• Could not run mintlify dev in this sandbox to visually confirm; the previous fix (Fix CopyPromptButton crashing when rendered with no props #513) looked correct under local JS semantics but didn't reproduce the actual production error, so this should be spot-checked on preview once deployed.

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Note

Low Risk
Small docs-snippet scoping fix with no auth, data, or infrastructure impact. Override behavior for explicit prompt props is preserved.

Overview
Fixes a production ReferenceError: DEFAULT_PROMPT is not defined on the homepage copy-prompt button.

Moves the default prompt string back inside CopyPromptButton instead of a module-level DEFAULT_PROMPT. Callers can still pass prompt (Foreman) or omit it (homepage). label still defaults when props is missing.

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Project	Status	Preview	Updated (UTC)
Kernel	🟢 Ready	View Preview	Aug 21, 2026, 7:09 PM

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[cursor]

Risk assessment: Low

Verdict: Approving. Single-file, isolated docs-snippet scoping fix with no auth, infra, or shared-library impact.

What changed

• File: snippets/copy-prompt-button.jsx (+5/−5)
• Moves the default copy-prompt string from a module-level DEFAULT_PROMPT into the component body, and binds prompt with (props && props.prompt) || <default> instead of a destructuring default.
• The default prompt text is unchanged; only identifier scope and defaulting mechanics changed.
• Call sites remain index.mdx (no prompt prop) and integrations/vercel/foreman.mdx (explicit prompt). Override path is preserved for a truthy props.prompt.

Why Low (not Medium+)

• Blast radius is one Mintlify snippet used by two docs pages.
• No CODEOWNERS file, no auth/billing/permissions, no schema or infra.
• Not a prompt-content change: the LLM instruction string is identical; this is a JS scoping fix around an existing string.

Residual note (non-blocking)

Destructuring defaulted only on undefined; || also treats other falsy values (e.g. "") as missing. Neither current call site relies on a falsy prompt, so this is not a reason to withhold approval.

Action: Approve.

  

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