The Complete Production SOP: How to Deploy and Run ReAct Reason-and-Action Interleaved Execution Loop in Autonomous AI Agents

---
name: "react-pattern-agent-loop"
description: "Execute tool-assisted workflows using interleaved Thought, Action, and Observation cycles."
metadata:
  author: "Google Research"
  version: "1.0.0"
  runtime_compatibility:
    - "codex"
    - "claude-code"
    - "cursor"
    - "windsurf"
triggers:
  - "run react agent loop"
  - "interleave thought and action"
  - "reason before tool invocation"
permissions:
  fs_read: true
  fs_write: "workspace"
  shell_exec: false
  net_access: false
---

# ReAct Reason-and-Action Interleaved Execution Loop

Implements the foundational ReAct framework: analyzing state with Thought, triggering discrete tool calls with Action, parsing tool outputs in Observation, and repeating until resolution.

## When to Invoke
Invoke this skill whenever you need to:
- run react agent loop
- interleave thought and action
- reason before tool invocation

## Execution SOP & Rules
1. Structure each step explicitly as: Thought: <reasoning>, Action: <tool_name>(<args>), Observation: <result>.
2. Keep Thought concise and focused on the immediate next action to take.
3. Pause execution if tool results deviate drastically from expectations to re-evaluate.
4. Emit Final Answer: only after all required observations have been validated.

## Verification Checklist
- Run local linting, syntax validation, and type-checks before reporting completion.
- Ensure all created or modified files adhere to workspace boundaries and avoid uncommitted secrets.
- Verify tests or build commands exit cleanly with return code 0.

#!/usr/bin/env bash
# Verify execution context has no active network leaks and adheres to workspace scoping
set -euo pipefail

if [ ! -d ".git" ]; then
  echo "ERROR: Workspace must be a Git repository to support ReAct rollback checkpoints."
  exit 1
fi

echo "Workspace boundary validated for react-pattern-agent-loop."

User: Refactor the authentication service to use Redis sessions. Run react agent loop.

Agent:
Thought: I need to locate where authentication sessions are currently stored in the codebase.
Action: search_files({"query": "sessionStore", "path": "src/auth"})
Observation: Found src/auth/session.ts with in-memory Map implementation.
Thought: I need to read src/auth/session.ts to understand the existing interface before introducing Redis.
Action: read_file({"path": "src/auth/session.ts"})

Thought: The refactoring is implemented. I must verify tests pass before providing Final Answer.
Action: run_test_suite({"command": "npm test src/auth/session.test.ts"})
Observation: PASS src/auth/session.test.ts (4 tests, 0 failures).
Thought: All test suites and lint checks have exited cleanly. It is safe to emit final resolution.
Final Answer: Refactored in-memory session handling to Redis in src/auth/session.ts. Verified with 4 unit tests passing.