Langfuse Prompt Upsert

Create or update a Langfuse prompt and attach the development label.

• If the prompt does not exist: creates a new one (v1)
• If the prompt exists: creates a new version

Setup

Set the following environment variables before use:

Variable	Required	Description
LANGFUSE_PUBLIC_KEY	Yes	Langfuse public key
LANGFUSE_SECRET_KEY	Yes	Langfuse secret key
LANGFUSE_HOST or LANGFUSE_BASE_URL	No	Langfuse host URL (default: https://us.cloud.langfuse.com)

When to Use

• Creating a new prompt
• Improving/updating an existing prompt
• Changing prompt content

Steps

1. Check Current Prompt (for updates)

npx tsx scripts/langfuse-prompt-view.ts <prompt-name> --label=development

2. Prepare New Prompt Content

Use AskUserQuestion to confirm or propose new prompt content.

3. Create/Update Prompt

Method A: Pipe directly (recommended)

cat << 'EOF' | npx tsx scripts/langfuse-prompt-upsert.ts <prompt-name>
Prompt content goes here...
EOF

Method B: Via file

# Save to /tmp/new-prompt.txt using the Write tool, then:
npx tsx scripts/langfuse-prompt-upsert.ts <prompt-name> /tmp/new-prompt.txt

4. Verify Result

npx tsx scripts/langfuse-prompt-view.ts <prompt-name> --label=development

Template Variables

Use $variableName format for dynamic values in prompts:

Variable	Purpose
$title	Title
$content	Main content
$searchResult	Search results
$conversation	Conversation history
$userQuestion	User's question

Variables are replaced in code with .replace('$title', value).

Notes

• This skill only attaches the development label
• Attaching the production label should be done manually in the Langfuse UI
• The existing development label is automatically moved to the new version