Executive Summary
In the context of securing Model Context Protocol (MCP) servers—the critical link between LLMs and sensitive system resources—we propose the formalization of a Pre-Modification Specification Protocol.
To prevent systemic entropy and security regressions, no source code modification affecting MCP server logic (transport, resource access, or permission mapping) should be implemented without a prior Design Specification Document (Cahier des Charges).
1. Rationale: From Experimental to Mission-Critical
MCP servers operate at the intersection of untrusted model outputs and trusted system assets (File Systems, Robotics APIs, Industrial DBs).
Systemic Integrity: Ad-hoc modifications increase the attack surface without oversight.
Compliance: Alignment with the EU AI Act (Art. 11/12) and NIS2 requires exhaustive technical documentation before deployment.
Traceability: A formal "Cahier des Charges" ensures that every architectural shift is intentional and peer-reviewed.
2. Mandatory Impact Analysis (Before/After Matrix)
Every proposed modification must be accompanied by a comparative matrix to evaluate the expansion of the security perimeter:
Security Dimension | Primary State (Baseline) | Proposed Modification | Risk Assessment
-- | -- | -- | --
Execution Environment | Isolated (e.g., FreeBSD Jail/Capsicum) | Unchanged / Expanded | Permission escalation check
Communication Layer | Local Unix Socket | Local + Hardened TCP | Network surface exposure
Supply Chain (SBOM) | Standard Library Only | New Third-Party Dependency | ISO/IEC 5230 Compliance check
Input Validation | Strict Schema Enforcement | Dynamic/Extended Schema | Injection risk analysis
3. Documented Reversibility & Primary State Restoration
Resilience is defined by the ability to return to a known secure state. Any modification must include a Restoration Protocol:
State Pinning: Explicit identification of the Origin Commit SHA (Baseline).
Rollback Procedure: A documented, tested sequence to revert code and data schemas to the primary state.
Integrity Healthcheck: A post-rollback diagnostic script to verify that the server has recovered its original "Sovereign" configuration without residual artifacts.
4. Proposed Validation Workflow
To ensure high-integrity contributions, we recommend the following cycle:
Phase A (Specification): Submission of the Design Intent (Cahier des Charges).
Phase B (Architectural Review): Evaluation by Maintainers focusing on Determinism and Security.
Phase C (Implementation): Signed-off commits with an updated SBOM.
Phase D (Verification): Testing of both the new feature and the rollback mechanism.
Conclusion
By enforcing a "Specification-First" approach, the OSSF AI-ML Security group can set a benchmark for Sovereign AI Governance. We move from "Move Fast and Break Things" to "Architect for Resilience".
Executive Summary
In the context of securing Model Context Protocol (MCP) servers—the critical link between LLMs and sensitive system resources—we propose the formalization of a Pre-Modification Specification Protocol.
To prevent systemic entropy and security regressions, no source code modification affecting MCP server logic (transport, resource access, or permission mapping) should be implemented without a prior Design Specification Document (Cahier des Charges).
1. Rationale: From Experimental to Mission-Critical
MCP servers operate at the intersection of untrusted model outputs and trusted system assets (File Systems, Robotics APIs, Industrial DBs).
Systemic Integrity: Ad-hoc modifications increase the attack surface without oversight.
Compliance: Alignment with the EU AI Act (Art. 11/12) and NIS2 requires exhaustive technical documentation before deployment.
Traceability: A formal "Cahier des Charges" ensures that every architectural shift is intentional and peer-reviewed.
2. Mandatory Impact Analysis (Before/After Matrix)
Every proposed modification must be accompanied by a comparative matrix to evaluate the expansion of the security perimeter:
Security Dimension | Primary State (Baseline) | Proposed Modification | Risk Assessment -- | -- | -- | -- Execution Environment | Isolated (e.g., FreeBSD Jail/Capsicum) | Unchanged / Expanded | Permission escalation check Communication Layer | Local Unix Socket | Local + Hardened TCP | Network surface exposure Supply Chain (SBOM) | Standard Library Only | New Third-Party Dependency | ISO/IEC 5230 Compliance check Input Validation | Strict Schema Enforcement | Dynamic/Extended Schema | Injection risk analysis3. Documented Reversibility & Primary State Restoration
Resilience is defined by the ability to return to a known secure state. Any modification must include a Restoration Protocol:
State Pinning: Explicit identification of the Origin Commit SHA (Baseline).
Rollback Procedure: A documented, tested sequence to revert code and data schemas to the primary state.
Integrity Healthcheck: A post-rollback diagnostic script to verify that the server has recovered its original "Sovereign" configuration without residual artifacts.
4. Proposed Validation Workflow
To ensure high-integrity contributions, we recommend the following cycle:
Phase A (Specification): Submission of the Design Intent (Cahier des Charges).
Phase B (Architectural Review): Evaluation by Maintainers focusing on Determinism and Security.
Phase C (Implementation): Signed-off commits with an updated SBOM.
Phase D (Verification): Testing of both the new feature and the rollback mechanism.
Conclusion
By enforcing a "Specification-First" approach, the OSSF AI-ML Security group can set a benchmark for Sovereign AI Governance. We move from "Move Fast and Break Things" to "Architect for Resilience".