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Playground is an interactive sandbox to experiment with prompts, models, and tools—either from scratch or directly from traced spans.

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What You Can Do

  • Prompt experimentation: Test prompt variations and inputs with instant results.
  • Open from spans: Reproduce exact configurations from any span with Open in Playground.
  • Tool integration: Configure and test custom tools that models can call.
  • Session history: Review and replay past runs with full context.
Laminar Playground Interface
To access the playground:
  1. In the Laminar dashboard, click New playground.
  2. Choose a model and start experimenting—or open directly from a span.

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Start from Scratch

  • Create a new playground to iterate quickly.
  • Send requests, view responses, and compare outputs side by side.
  • Save versions to revisit later.

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Start from a Span

Click Open in Playground on any LLM span; the playground inherits:
  • Model settings (model, temperature, token limits, thinking tokens)
  • Images and input formatting
  • Tools and tool configuration
  • System prompts and message history
This removes the need to recreate complex requests—tweak and rerun immediately.
Playground opened from a traced span

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Tools

Add tools so models can call functions during a session. Tools are defined as JSON with function names, descriptions, and parameter schemas; choose when tools are allowed (none, auto, required, or a specific function).
Laminar Playground Tools
Example tool config 
{
  "searchDatabase": {
    "description": "Search for information in the company database",
    "parameters": {
      "type": "object",
      "properties": {
        "query": { "type": "string", "description": "Search query or keywords" },
        "category": {
          "type": "string",
          "enum": ["users", "orders", "products"],
          "description": "Database category to search"
        },
        "limit": {
          "type": "number",
          "description": "Maximum number of results to return",
          "default": 10
        }
      },
      "required": ["query", "category"]
    }
  }
}
Learn more about tool choice options in the AI SDK documentation.

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History

Every playground run is saved. The History tab shows:
  • Full conversations (prompts and responses)
  • Model configurations (model, temperature, tokens, etc.)
  • Tool calls with inputs/outputs
  • Performance metrics (latency, tokens, cost)
  • Timestamps for each run
Laminar Playground History
Open any past run to review, compare, or duplicate it for new experiments.