# Signal Coding Ltd

> Signal Coding is a UK-owned, security-cleared AI-accelerated software engineering company serving Government, Defence, and National Security. We deliver governed AI development with defence-grade security assurance. We also build Signal Sentinel, a family of open-source security tools for the Model Context Protocol (MCP) and Agent Skill ecosystems.

Signal Coding is registered in England and Wales. SC/DV cleared personnel. Microsoft .NET / Azure stack. Royal Corps of Signals heritage.

## Company

- [About Signal Coding](https://www.signalcoding.co.uk/about/): Company background, heritage, team, and mission. UK-owned SME serving Government, Defence, and National Security.
- [Our Approach](https://www.signalcoding.co.uk/approach/): Governed AI-accelerated development methodology. Development Super Prompt framework. Human-in-the-loop assurance. Secure by Design aligned.
- [Services](https://www.signalcoding.co.uk/services/): Rapid capability delivery, legacy modernisation, cloud solutions, AI advisory, and through-life support for UK Government and Defence.
- [Security](https://www.signalcoding.co.uk/security/): Security posture, certifications (Cyber Essentials Plus, ISO 27001 in progress), JSP 440/656 alignment, and Secure by Design methodology.
- [Contact](https://www.signalcoding.co.uk/contact/): Contact Signal Coding for enquiries about AI-accelerated software development, Signal Sentinel products, or partnership opportunities.

## Sectors

- [Defence](https://www.signalcoding.co.uk/sectors/defence/): Software development for UK MOD, Defence Digital, DSTL, DIO, SDA. JSP 440 compliant. SC/DV cleared. D2S deployment capable.
- [National Security](https://www.signalcoding.co.uk/sectors/national-security/): Software for UK intelligence community and national security organisations. DV cleared. Air-gapped capability. Compartmentalised projects.
- [Government](https://www.signalcoding.co.uk/sectors/government/): AI-accelerated software for UK Government departments and public bodies. GDS Service Standard aligned. G-Cloud supplier.

## Products – Signal Sentinel

- [Signal Sentinel Suite](https://www.signalcoding.co.uk/products/): Signal Sentinel is a family of security tools for MCP servers and Agent Skills. 25 security rules. Triple OWASP mapping (Agentic AI Top 10, Agentic Skills Top 10, MCP Top 10). Free and open source.
- [Sentinel Scanner](https://www.signalcoding.co.uk/products/sentinel-scanner/): CLI security scanner for MCP server configurations and Agent Skill packages. 25 rules, A-F grading, SARIF v2.1.0 output, offline mode, CI/CD integration, auto-discovery across 7 platforms. .NET 10 LTS. Apache 2.0. v2.3.0.
- [MCP Scanner Comparison](https://www.signalcoding.co.uk/products/sentinel-scanner/compare/): Feature comparison of Signal Sentinel Scanner vs Invariant MCP Scan vs Pillar MCP Audit.
- [Sentinel Gateway](https://www.signalcoding.co.uk/products/sentinel-gateway/): Real-time MCP proxy and firewall. Policy enforcement, PII redaction, behavioural monitoring, kill switch, audit logging. Coming Q2 2026.
- [Sentinel Classify](https://www.signalcoding.co.uk/products/sentinel-classify/): Document classification MCP server for AI agents. Multi-cloud deployment. UK data residency. Coming Q4 2026.

## Technical Resources

- [GitHub Repository](https://github.com/SignalCoding/signal-sentinel-scanner): Source code, issues, and releases for Signal Sentinel Scanner.
- [NuGet Package](https://www.nuget.org/packages/SignalSentinel.Scanner): .NET global tool distribution for Signal Sentinel Scanner.

## Markdown Versions (clean content for AI parsing)

- [Signal Sentinel Suite (markdown)](https://www.signalcoding.co.uk/products.md): Products overview in clean markdown.
- [Sentinel Scanner (markdown)](https://www.signalcoding.co.uk/products/sentinel-scanner.md): Full Scanner page in clean markdown including all rules, examples, and FAQ.
- [About Signal Coding (markdown)](https://www.signalcoding.co.uk/about.md): Company background in clean markdown.
- [Defence Sector (markdown)](https://www.signalcoding.co.uk/sectors/defence.md): Defence capabilities in clean markdown.
- [Services (markdown)](https://www.signalcoding.co.uk/services.md): Service catalogue in clean markdown.

## Insights

- [Insights](https://www.signalcoding.co.uk/insights/): Articles on AI-accelerated development, defence technology, government digital transformation, MCP security, and AI governance.

## Key Facts

- Headquarters: United Kingdom
- Founded: 2025
- Security clearances: SC and DV cleared personnel
- Technology stack: .NET 10 LTS, C#, ASP.NET Core, Azure
- Target sectors: UK Government, Defence, National Security
- Products: Signal Sentinel Scanner v2.3.0 (released April 2026), Signal Sentinel Gateway (Q2 2026), Signal Sentinel Classify (Q4 2026)
- Licensing: Apache 2.0 (Scanner), BSL 1.1 (Gateway)
- Contact: contact@signalcoding.co.uk
- Security contact: security@signalcoding.co.uk