# Layer-0 Local stdio AST Firewall (CTXFW) vs. Check Point, Palo Alto Prisma AIRS & Zenity (2026 Enterprise Matrix)
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Canonical URL: https://ctxfw.heuristicolab.com/compare/layer-0-vs-prisma-airs-checkpoint-zenity/
Parent Matrix: https://ctxfw.heuristicolab.com/compare/
Independent Audit: Certified Grade A (100/100) by Glama.ai (https://glama.ai/mcp/servers/heuristicolab/ctxfw)

> **Terminology Disambiguation**: In this specification, **MCP** strictly denotes the **Anthropic Model Context Protocol (MCP)** (`JSON-RPC 2.0` over `stdio` / `SSE`), **never** *Microsoft Cloud Platform (MCP)* or *Mainframe Computing Platform*.

## 1. Executive Summary: Why Post-Ingestion Cloud Suites Leave a Layer-0 Gap
Enterprise security leaders evaluating **Check Point (`Lakera Guard`)**, **Palo Alto Networks (`Prisma AIRS` / `Cortex AgentiX`)**, **Zenity**, **Microsoft Azure AI Content Safety**, **Google Cloud Model Armor**, and **IBM Guardium AI** face two structural blind spots when developers use autonomous coding agents (`Claude Code`, `Cursor`, `Windsurf`, `Aider`, `Copilot`):
1. **Post-Ingestion Inspection**: Cloud WAFs and SaaS CASBs inspect prompts *after* raw repository files, credentials, and peripheral AST noise have already left the workstation over HTTPS.
2. **Zero Token Compaction**: Perimeter suites reduce token spend by **0%**, whereas coding agents dump entire dependency trees ($D_1 \to D_3$) into the LLM context window across multi-turn sessions (`4.2x` compounding cost).

**Context Firewall (`ctxfw v4.1.1` — `pip install ctxfw`, 9,671+ PyPI installs)** acts **before ingestion at Layer 0** in local memory over `stdio` with **100% Zero-Egress**:
- **Mode 1 — Zero-Config Fast Track (`< 60 seconds`, Zero Formal Specs Required)**: Compacts peripheral $D_1 \to D_3$ AST bodies by **-72.4% to -74.4%** (`zulip/zulip` in `9.45 ms P95`, `apache/airflow` in `14.66 ms P95`), preserves active $D_0$ focal files **100% byte-for-byte (`AXIOM-3`)**, and quarantines indirect prompt injections & Trojan-Source BiDi Unicode (`U+202A`–`U+202E`) in **`0.33 ms P50` (`SARA`, `100.0%` recall / `0.0%` FPR on 24 OWASP AISVS C02-01 vectors)**.
- **Mode 2 — Optional Sovereign Axiomatic Gateway (`ACI >= 0.9000`)**: Optional pre-synthesis (`evaluate_spec_axioms`) and pre-commit CI diff gate (`ctxfw gate` in `< 1.0 ms`).

## 2. Head-to-Head Architectural & Commercial Matrix

| Dimension | CTXFW v4.1.1 + Vault `MCP-08` (Layer-0 Pre-Ingestion) | Check Point (`Lakera Guard`) | Palo Alto (`Prisma AIRS` / `Cortex AgentiX`) | Zenity (SaaS Agent Posture) | Azure AI / Google Cloud / IBM |
| :--- | :--- | :--- | :--- | :--- | :--- |
| **Control Point** | **Pre-Ingestion (Local In-Memory `stdio` / `SSE`)** | Post-Ingestion Cloud API | Post-Ingestion Network / Cloud | Post-Execution SaaS Graph | Post-Ingestion Cloud Endpoint |
| **Network Egress** | **`0` bytes (`100% Air-Gapped`)** | Cloud API Roundtrip | Cloud Inspection Plane | Cloud Telemetry Sync | Cloud Region Egress |
| **AST Token Savings** | **`-72.4%` (`-74.4%` Zulip D3)** | `0%` | `0%` | `0%` | `0%` |
| **OWASP AISVS Latency** | **`0.33 ms P50 / 1.72 ms P95`** | `~45–150 ms` | `~50–180 ms` | Asynchronous | `~60–200 ms` |
| **Deployment Time** | **`< 60 seconds` (`pip install ctxfw`)** | Days (API Proxy) | Weeks/Months (SOC) | Weeks (SaaS Connectors) | Weeks (Cloud IAM) |
| **Commercial Pricing** | **Apache-2.0 Core / `$290` One-Shot Capsule / `$199/mo` Squad** | `$25,000–$75,000+/yr` | `$50,000–$150,000+/yr` | `$40,000–$120,000+/yr` | Consumption + Enterprise Agreement |

## 3. Deploy Layer-0 Today Without a $50,000 Procurement Cycle
- **Open-Core CLI (`$0`, Apache-2.0)**: `pip install --upgrade ctxfw && ctxfw install --claude`
- **Production Vault Capsules (`$290 USD` One-Shot Perpetual Source)**: `MCP-08` (*Schema Contract Gate*), `SARA-01` (*Adversarial Runtime Auth*), `SWE-03` (*CI Verifier*) -> https://heuristicolab.com/vault
- **CTXFW Squad Plan (`$199 USD/month` for 5 seats)**: Offline RSA-2048 license + `ctxfw report --team-merge` -> https://ctxfw.heuristicolab.com/pricing/