Contrib/1212 - Stagehand Agent param is instructions instead of systemPrompt

[miguelg719]

from #1212 shoutout @bennycortese
Stagehand agent no longer directly takes in instructions. It takes in a systemPrompt instead, I noticed this while running npx create-browser-app and seeing the error appear

[changeset-bot]

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR updates v3 documentation to fix the agent configuration parameter from instructions to systemPrompt, aligning with the actual API implementation.

Changes Made

• Updated agent-fallbacks.mdx (1 occurrence)
• Updated mcp-integrations.mdx (9 occurrences across multiple examples)

Impact

The changes fix a documentation bug that would cause runtime errors for developers following the examples. The parameter name systemPrompt is confirmed correct per the AgentConfig type definition in packages/core/lib/v3/types/public/agent.ts:176.

Confidence Score: 5/5

• This PR is safe to merge with no risk - it only fixes documentation to match the actual API
• The changes are purely documentation updates that fix incorrect parameter names. All changes have been verified against the actual TypeScript implementation which confirms systemPrompt is the correct parameter name in AgentConfig
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
packages/docs/v3/best-practices/agent-fallbacks.mdx	5/5	Updated stagehand.agent() parameter from instructions to systemPrompt to match current API
packages/docs/v3/best-practices/mcp-integrations.mdx	5/5	Updated all stagehand.agent() examples (9 instances) from instructions to systemPrompt parameter

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Docs as Documentation
    participant API as Stagehand API
    
    Note over Dev,API: Before PR (Incorrect)
    Dev->>Docs: Read agent documentation
    Docs-->>Dev: Shows instructions parameter
    Dev->>API: agent({ instructions: "..." })
    API-->>Dev: ❌ Error: Parameter not recognized
    
    Note over Dev,API: After PR (Correct)
    Dev->>Docs: Read agent documentation
    Docs-->>Dev: Shows systemPrompt parameter
    Dev->>API: agent({ systemPrompt: "..." })
    API-->>Dev: ✅ Agent created successfully

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