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sentinel199

Open Sentinel - Agent Reliability Layer

by sentinel199 · GitHub ↗ · v1.0.4
cross-platform ✓ Security Clean
561
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2
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1
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4
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Install in OpenClaw
/install open-sentinel
Description
Transparent LLM proxy that monitors and enforces policies on AI agent behavior — evaluates responses against configurable rules for hallucinations, PII leaks...
Usage Guidance
This skill appears to do what it says: a local proxy that evaluates LLM responses. Before installing: (1) verify the PyPI package 'opensentinel' and the GitHub repo links in the SKILL.md actually match and are trustworthy; (2) inspect the package contents (or review its source repo) for telemetry endpoints, network calls, or unexpected background behavior; (3) run the package in a sandboxed environment or container and use least-privilege API keys (rotate or use test keys) when first testing; (4) review and disable/trust tracing/OTLP/langfuse settings to avoid sending sensitive spans externally; (5) confirm which provider API keys the runtime needs (Anthropic vs OpenAI/Gemini) and only supply keys appropriate to your usage. Because the registry bundle did not include the actual package code, these verifications are recommended to raise confidence beyond 'medium'.
Capability Analysis
Type: OpenClaw Skill Name: open-sentinel Version: 1.0.4 The skill bundle describes and provides instructions for 'Open Sentinel', a transparent LLM proxy designed to monitor and enforce policies on AI agent behavior. Its primary function is to prevent hallucinations, PII leaks, prompt injection, and workflow violations. All instructions across SKILL.md, README.md, and example-configs.yaml are focused on installing, configuring, and using this defensive security tool. There is no evidence of data exfiltration, malicious execution, persistence mechanisms, prompt injection attempts against the OpenClaw agent, obfuscation, or suspicious supply chain practices. The content is entirely consistent with a tool intended to enhance the security of LLM interactions.
Capability Assessment
Purpose & Capability
Name and description claim a transparent proxy that evaluates LLM responses; requiring a provider API key and python3 is consistent with that purpose. The skill documentation repeatedly references calling provider LLMs (Anthropic/Claude) and running a local proxy, which aligns with the declared purpose.
Instruction Scope
SKILL.md instructs installing the opensentinel package and running a local proxy (osentinel serve) and to set an LLM API key. It does not instruct reading unrelated system files or exfiltrating data. One item to note: tracing/OTLP and external telemetry (langfuse) are configurable in examples — if enabled, telemetry could be sent to external endpoints, so users should audit tracing settings before enabling them.
Install Mechanism
The skill is instruction-only in the registry, but SKILL.md recommends pip install opensentinel (PyPI). Installing from PyPI is a common pattern but introduces typical supply-chain risk — the actual package contents were not included for review here, so verify the PyPI package and upstream GitHub repository before installing.
Credentials
PrimaryEnv is ANTHROPIC_API_KEY which is reasonable for the judge engine. The README and SKILL.md also mention OPENAI_API_KEY and GEMINI_API_KEY as alternatives but those are not declared as required env vars; this mismatch is minor but worth confirming. No unrelated secrets or file paths are requested.
Persistence & Privilege
always:false (not force-included). The skill does not request elevated platform privileges or modify other skills' configs. It runs as a local proxy and does not claim persistent system-wide modifications.
How to Use
  1. Make sure OpenClaw is installed (local or Docker)
  2. Run the install command in chat: /install open-sentinel
  3. After installation, invoke the skill by name or use /open-sentinel
  4. Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.0.4
- Updated installation method in metadata from "uv" to "pip" for compatibility. - Streamlined and condensed SKILL.md documentation for easier onboarding. - Clarified setup steps, proxy usage, CLI commands, and configuration. - Kept technical details and supported engines concise while preserving links and core instructions.
v1.0.3
Version 1.0.3 - No file changes detected in this release. - No updates or modifications to documentation or code.
v1.0.1
**Summary:** Major update with enhanced proxy mode, new requirements, improved security documentation, and streamlined policies. - Proxy mode now emphasized as the primary integration: point any OpenAI-compatible client to localhost for instant policy enforcement. - Explicit provider API key requirements and environment variable documentation added. - Enhanced documentation on security, tracing, and credential handling. - Simplified installation, initialization, and command-line usage instructions. - Workflow and state machine (FSM) policy engine now documented. - Policy definition and quick start instructions are more concise and YAML-based. - Troubleshooting and safe-by-default proxy behavior more clearly described.
v1.0.0
Open Sentinel 1.0.0 – Initial Release - Introduces a runtime reliability layer for LLM apps, guarding outputs for hallucinations, PII, prompt injection, and policy violations. - Offers inline guard decorators and a transparent local proxy for seamless integration with any OpenAI-compatible client. - Supports plain-English policies, YAML configuration, and multiple policy engines (judge, fsm, llm, nemo, composite). - Fails open by design: hook or timeout failures let traffic through; only explicit violations block output. - Fully open source, works with all major LLM vendors, and easy to install via pip.
Metadata
Slug open-sentinel
Version 1.0.4
License
All-time Installs 1
Active Installs 1
Total Versions 4
Frequently Asked Questions

What is Open Sentinel - Agent Reliability Layer?

Transparent LLM proxy that monitors and enforces policies on AI agent behavior — evaluates responses against configurable rules for hallucinations, PII leaks... It is an AI Agent Skill for Claude Code / OpenClaw, with 561 downloads so far.

How do I install Open Sentinel - Agent Reliability Layer?

Run "/install open-sentinel" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.

Is Open Sentinel - Agent Reliability Layer free?

Yes, Open Sentinel - Agent Reliability Layer is completely free (open-source). You can download, install and use it at no cost.

Which platforms does Open Sentinel - Agent Reliability Layer support?

Open Sentinel - Agent Reliability Layer is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).

Who created Open Sentinel - Agent Reliability Layer?

It is built and maintained by sentinel199 (@sentinel199); the current version is v1.0.4.

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