spawn-agent

Purpose

Spawn an AI coding agent in a new terminal window. Follow the 'Instructions', execute the 'Workflow', based on the 'Cookbook'.

Variables

| Variable | Default | Description | |----------|---------|-------------| | DEFAULT_AGENT | claude-code | Agent to use when not explicitly specified | | ENABLED_CLAUDE_CLI | true | Enable Claude Code agent | | ENABLED_CODEX_CLI | true | Enable OpenAI Codex agent | | ENABLED_GEMINI_CLI | true | Enable Google Gemini agent | | ENABLED_CURSOR_CLI | true | Enable Cursor agent | | ENABLED_OPEN_CODE_CLI | true | Enable OpenCode agent | | ENABLED_COPILOT_CLI | true | Enable GitHub Copilot agent | | LOG_TO_FILE | false | Write full terminal output to debug file | | LOG_AGENT_OUTPUT | true | Write clean agent JSON response to file | | READ_CAPTURED_OUTPUT | false | Read and display agent output after spawn | | AGENTIC_CODING_TOOLS | claude-code, codex-cli, gemini-cli, cursor-cli, opencode-cli, copilot-cli | Available agentic tools |

Instructions

MANDATORY - You MUST follow the Workflow steps below in order. Do not skip steps.

Agent Selection

1. Explicit request: If user specifies an agent (e.g., "use gemini", "spawn codex"), use that agent
2. No agent specified: Use DEFAULT_AGENT (claude-code)
3. Check enabled: Verify the ENABLED_*_CLI flag is true before proceeding

Reading Cookbooks

• Based on the selected agent, follow the 'Cookbook' section to read the appropriate .md file
• You MUST read and execute the appropriate cookbook file before spawning the agent

Red Flags - STOP and follow Cookbook

If you're about to:

• Spawn an agent without reading the cookbook first
• Execute a CLI command without running --help
• Skip steps because "this is simple"
• Run a CLI agent with a prompt but without checking INTERACTIVE_MODE requirements

STOP -> Read the appropriate cookbook file -> Follow its instructions -> Then proceed

Common Mistake: When spawning agentic CLIs (Claude, Codex, Gemini) with a prompt,

most require command chaining (e.g., && claude --continue) to stay in interactive

mode after the prompt completes. Always check the cookbook for the correct pattern.

Spawn Summary User Prompt

• IF: The user requests spawning an agent with a summary of the conversation
• THEN:
• Read and REPLACE the <user_prompt_summary> and <agent_response_summary> fields in './prompts/fork-summary-user-prompt.md' with the history of the conversation between you and the user.
• Include the next users request in the Next User Request field.
• This will be what you pass into the PROMPT field of the agentic coding tool.
• Spawn the agent with: fork_terminal(command: str, capture=False, log_to_file=False, log_agent_output=True)
• Examples:
• "Spawn agent use claude code to <xyz> with a summary"
• "spin up a new terminal with <xyz> with claude code. Include a summary of the conversation."
• "create a new agent with claude code to <xyz>. Summarize work so far."
• "spawn agent use gemini to <xyz> with a summary"

Workflow

MANDATORY CHECKPOINTS - Verify each before proceeding:

1. [ ] Understand the user's request
2. [ ] SELECT AGENT: Determine which agent (explicit or DEFAULT_AGENT)
3. [ ] READ: './fork_terminal.py' to understand the tooling
4. [ ] Follow the Cookbook (read the appropriate .md file for selected agent)
5. [ ] CHECKPOINT: Confirm cookbook instructions were followed (e.g., ran --help)
6. [ ] Execute fork_terminal(command: str, capture=False, log_to_file=False, log_agent_output=True)
7. [ ] IF 'READ_CAPTURED_OUTPUT' is true: Read and display the agent output using read_fork_output()

Cookbook

Claude Code (Default)

• IF: User requests Claude Code OR no agent explicitly specified
• THEN: Read and execute './cookbook/claude-code.md'
• Examples:
• "Spawn an agent to <xyz>"
• "Fork terminal to <xyz>" (no agent specified = claude-code)
• "Spawn agent use claude code to <xyz>"
• "spin up a new terminal with claude code"

Codex CLI

• IF: User requests Codex/OpenAI agent and 'ENABLED_CODEX_CLI' is true
• THEN: Read and execute './cookbook/codex-cli.md'
• Examples:
• "Spawn agent use codex to <xyz>"
• "create a new terminal with codex cli to <xyz>"
• "spawn openai agent to <xyz>"

Gemini CLI

• IF: User requests Gemini/Google agent and 'ENABLED_GEMINI_CLI' is true
• THEN: Read and execute './cookbook/gemini-cli.md'
• Examples:
• "Spawn agent use gemini to <xyz>"
• "create a new terminal with gemini cli to <xyz>"
• "spawn google agent to <xyz>"

Cursor CLI

• IF: User requests Cursor agent and 'ENABLED_CURSOR_CLI' is true
• THEN: Read and execute './cookbook/cursor-cli.md'
• Examples:
• "Spawn agent use cursor cli to <xyz>"
• "create a new terminal with cursor to <xyz>"
• "spawn cursor agent to <xyz>"

OpenCode CLI

• IF: User requests OpenCode agent and 'ENABLED_OPEN_CODE_CLI' is true
• THEN: Read and execute './cookbook/opencode-cli.md'
• Examples:
• "Spawn agent use opencode cli to <xyz>"
• "create a new terminal with opencode to <xyz>"
• "spawn opencode agent to <xyz>"

Copilot CLI

• IF: User requests Copilot/GitHub agent and 'ENABLED_COPILOT_CLI' is true
• THEN: Read and execute './cookbook/copilot-cli.md'
• Examples:
• "Spawn agent use copilot cli to <xyz>"
• "create a new terminal with copilot to <xyz>"
• "spawn github copilot agent to <xyz>"

Output Retrieval

The fork_terminal() function supports three output controls:

| Parameter | Default | Output File | Description | |-----------|---------|-------------|-------------| | log_agent_output | True | /tmp/fork-agent-.json | Clean agent JSON response | | log_to_file | False | /tmp/fork-debug-.txt | Full terminal output (debug) | | capture | False | N/A | Block and return content directly |

Parameter Combinations

| capture | log_agent_output | log_to_file | Behavior | |-----------|-------------------|---------------|----------| | False | True (default) | False | Returns agent JSON file path | | False | False | True | Returns debug file path | | False | False | False | Returns empty string | | True | True | * | Blocks, returns agent JSON content | | True | False | True | Blocks, returns debug content |

Retrieving Output Later

When log_agent_output=True (default), clean agent output is logged. Use read_fork_output(file_path) to retrieve it:

# Spawn without blocking (returns path to JSON output)
file_path = fork_terminal(cmd, log_agent_output=True)
print(f"Agent output will be at: {file_path}")

# Later, read the output when needed
output = read_fork_output(file_path, timeout=60)

Debug Mode

For debugging, enable log_to_file=True to capture full terminal output (including stderr):

# Debug mode: capture everything
file_path = fork_terminal(cmd, log_to_file=True, log_agent_output=False)