Sentinel

What is Sentinel?

Sentinel vs Similar AI Tools

	Sentinel	Sentinel	SonOf	IntentGuard
Pricing Model	Free	Free	Paid	Free
Free Credits
Key Features	Code review agent that analyzes git diffs and posts findings (read-only) Documentation sync agent that updates Markdown docs to match code via PRs (docs-only, never auto-merges) Autonomous QA testing agent that understands product from code and executes end-to-end flows with backend assertions	Reads repository structure without model calls (grep+find) to extract routes, services, and entities Derives prioritized end-to-end business flows from code analysis Runs each flow as an agent loop with Playwright browser driving and backend API assertions via token reuse	Free audit of codebase and knowledge base Agentic code generation and refactoring Senior engineer review on every PR	Reviews PRs against linked Linear issues and sprint context Classifies PRs as ALIGNED, MISALIGNED, or UNCLEAR with reasoning Self-hosted via GitHub Actions, no data sent externally except to LLM provider
Pros	Requires no manual test writing — QA agent derives flows from code Deep autonomous testing with frontend and backend assertions	Open source and self-hosted, no vendor lock-in Automatically understands application logic from code, not just UI	Pay only for shipped code, no retainer Free audit with no obligation	Open-source and self-hosted, full data control Direct integration with GitHub and Linear
Cons	Requires setup of multiple dependencies (Node.js, Playwright, CLI tools) Agent-based testing can be non-deterministic and slower than scripted tests	Requires manual setup of environment and dependencies Not a hosted SaaS; operator must manage infrastructure	Not ideal for greenfield projects without scoping Requires upfront deposit for work	Requires LLM API key (Anthropic) for live use Only supports Linear issue tracking (no Jira, Notion, etc.)
Best For	Developers and teams wanting automated, continuous code review and testing QA engineers looking to reduce manual test script maintenance	Development teams needing automated end-to-end QA without writing test scripts Projects with complex business flows where UI-only testing misses backend state bugs	Non-technical founders Startups with overflowing backlogs	Engineering teams using Linear and GitHub Teams using AI coding agents like Copilot or Cursor

How to use Sentinel?

1. 1Clone the repository: git clone https://github.com/Simbastack-hq/sentinel.git.
2. 2Install dependencies: npm install and cd pi-ext/qa-browser && npm install.
3. 3Copy configuration files: cp config/sentinel.env.example config/sentinel.env and cp config/targets.json.example config/targets.json.
4. 4Set up credentials and targets in the config files.
5. 5Verify setup with: bin/sentinel doctor.
6. 6Run a single agent: bin/sentinel run <target> qa.
7. 7Install the scheduler for 24/7 operation: bin/sentinel install.

Sentinel Key Features

• Code review agent that analyzes git diffs and posts findings (read-only)
• Documentation sync agent that updates Markdown docs to match code via PRs (docs-only, never auto-merges)
• Autonomous QA testing agent that understands product from code and executes end-to-end flows with backend assertions
• Brain-sync agent that distills repository changes into a shared knowledge repo as PRs
• Scheduled execution via launchd or systemd with configurable cadences
• Safety model: sandboxed agents, no direct shell/filesystem access for LLMs, credentials kept out of logs
• Support for testing deployed apps, wallet-gated dApps, and multi-service stacks
• Detailed reports with screenshots, bug lists, and UI/UX grading

Sentinel Use Cases

• Automated code review on every commit without human intervention
• Keeping documentation in sync with evolving codebase
• End-to-end testing of web applications without writing test scripts
• Continuous knowledge distillation across multiple repositories for team awareness

Sentinel Pricing & Free Credits

Sentinel currently operates on a Free model.

Sentinel Pros & Cons

What is Sentinel best for?

• Developers and teams wanting automated, continuous code review and testing
• QA engineers looking to reduce manual test script maintenance
• Open-source projects needing unattended monitoring and documentation sync

Sentinel FAQ