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feat(dotnet): add MCP protocol support with OWASP coverage, multi-target .NET 8/10, ML-DSA post-quantum signing
Add comprehensive MCP (Model Context Protocol) security governance to the .NET SDK with 11/12 OWASP MCP Security Cheat Sheet sections covered. Multi-targets .NET 8.0 (LTS) and .NET 10.0 with post-quantum ML-DSA-65 (NIST FIPS 204) signing on .NET 10+. Core components: - McpGateway: 5-stage pipeline (deny→allow→sanitize→rate-limit→approve) - McpSecurityScanner: 6-threat detection with SHA-256 fingerprinting - McpMessageHandler: JSON-RPC routing with tool-to-ActionType classification - McpResponseScanner: Output validation (injection, credentials, exfiltration) - McpSessionAuthenticator: Crypto session binding with TOCTOU-safe concurrency - McpMessageSigner: HMAC-SHA256 (.NET 8) + ML-DSA-65 post-quantum (.NET 10+) - CredentialRedactor: 10 credential pattern redaction for audit logs - McpSlidingRateLimiter: Per-agent sliding window rate limiting Integration: - ASP.NET Core: AddMcpGovernance(), UseMcpGovernance(), MapMcpGovernance() - IConfiguration binding, ILogger<T>, IHealthCheck, gRPC interceptor - McpToolRegistry with [McpTool] attribute auto-discovery - AgentGovernance.ModelContextProtocol adapter sub-package (official SDK) - OTel metrics: mcp_decisions, mcp_threats_detected, mcp_rate_limit_hits, mcp_scans Tests: 973 passing (0 failures) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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‎CHANGELOG.md‎

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## [Unreleased]
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### Added
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- **.NET MCP Protocol Support** — Full Model Context Protocol governance layer multi-targeting .NET 8.0 and .NET 10.0 with 11/12 OWASP MCP Security Cheat Sheet coverage
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- `McpGateway`: 5-stage pipeline (deny-list → allow-list → sanitization → rate-limiting → human approval)
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- `McpSecurityScanner`: 6-threat detection (tool poisoning, rug-pull, cross-server, description injection, schema abuse, protocol attacks)
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- `McpSessionAuthenticator`: Cryptographic session binding with TTL and TOCTOU-safe concurrency
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- `McpMessageSigner`: HMAC-SHA256 message integrity + ML-DSA-65 post-quantum signing on .NET 10+ (NIST FIPS 204)
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- `McpResponseScanner`: Output validation (HTML tags, imperatives, credential leakage, data exfiltration)
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- `CredentialRedactor`: 10 credential pattern redaction (API keys, tokens, PEM, connection strings)
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- `McpSlidingRateLimiter`: Per-agent sliding window rate limiting
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- ASP.NET Core integration: `AddMcpGovernance()`, `UseMcpGovernance()`, `MapMcpGovernance()`
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- `IConfiguration` binding, `ILogger<T>` structured logging, `IHealthCheck` implementation
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- gRPC server interceptor (all 4 handler types)
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- `[McpTool]` attribute for auto-discovery with `McpToolRegistry`
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- OpenTelemetry: 4 MCP-specific counters (decision, threat, rate-limit, scan)
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- `AgentGovernance.ModelContextProtocol` adapter sub-package for official MCP SDK integration
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- 2 sample apps: ASP.NET Core full-stack and Official MCP SDK integration
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- K8s MCP server hardening guide (`docs/deployment/mcp-server-hardening.md`)
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### Security
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- **Hardened CLI Error Handling** — standardized sanitized JSON error output across all 7 ecosystem tools to prevent internal information disclosure (CWE-209).
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- **Audit Log Whitelisting** — implemented strict key-whitelisting in `agentmesh audit` JSON output to prevent accidental leakage of sensitive agent internal state.

‎README.md‎

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- [Agent SRE](packages/agent-sre/) | [Observability integrations](packages/agent-hypervisor/src/hypervisor/observability/)
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- **MCP Security Scanner**: Detect tool poisoning, typosquatting, hidden instructions, and rug-pull attacks in MCP tool definitions
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- [MCP Scanner](packages/agent-os/src/agentos/mcp_security.py) | [CLI](packages/agent-os/src/agentos/cli/mcp_scan.py)
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- **.NET MCP Protocol Support**: Full governance pipeline for .NET 8.0 — 5-stage gateway, 6-threat scanner, session auth, message signing, credential redaction (11/12 OWASP MCP sections)
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- [.NET MCP SDK](packages/agent-governance-dotnet/) | [Official MCP SDK Adapter](packages/agent-governance-dotnet/src/AgentGovernance.ModelContextProtocol/)
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- **Trust Report CLI**: `agentmesh trust report` — visualize trust scores, task success/failure, and agent activity
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- [Trust CLI](packages/agent-mesh/src/agentmesh/cli/trust_cli.py)
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- **Secret Scanning & Fuzzing**: Gitleaks workflow, 7 fuzz targets covering policy, injection, sandbox, trust, and MCP

‎docs/deployment/mcp-server-hardening.md‎

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# MCP Server Hardening Guide
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Deployment guidance for running MCP tool servers securely, aligned with
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[OWASP MCP Security Cheat Sheet §3 — Sandbox & Isolate MCP Servers](https://cheatsheetseries.owasp.org/cheatsheets/MCP_Security_Cheat_Sheet.html).
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## Transport: prefer stdio over HTTP
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When the MCP server runs on the same host as the agent, use **stdio** transport
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rather than HTTP/SSE. This eliminates the network attack surface entirely —
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no open ports, no TLS configuration, no SSRF vectors.
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```yaml
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# docker-compose.yml — stdio transport
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services:
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mcp-server:
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image: myregistry/mcp-tools:1.2.3@sha256:abc...
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stdin_open: true
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read_only: true
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security_opt: ["no-new-privileges"]
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```
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For HTTP transport, require mTLS between agent and server (see §6).
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## Kubernetes: securityContext
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Every MCP server pod should run as a non-root user with a read-only root
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filesystem and all capabilities dropped:
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: mcp-server
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spec:
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securityContext:
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runAsNonRoot: true
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runAsUser: 65534 # nobody
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runAsGroup: 65534
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fsGroup: 65534
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seccompProfile:
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type: RuntimeDefault
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containers:
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- name: mcp-tools
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image: myregistry/mcp-tools:1.2.3@sha256:abc...
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securityContext:
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allowPrivilegeEscalation: false
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readOnlyRootFilesystem: true
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capabilities:
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drop: ["ALL"]
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resources:
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limits:
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cpu: "500m"
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memory: "256Mi"
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volumeMounts:
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- name: tmp
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mountPath: /tmp
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volumes:
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- name: tmp
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emptyDir:
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sizeLimit: 50Mi
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```
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## Network Isolation: NetworkPolicy
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Restrict MCP servers so they can **only** communicate with the agent
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orchestrator and required backends (database, blob storage). Block all
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egress to the public internet and to the cloud metadata service:
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```yaml
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apiVersion: networking.k8s.io/v1
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kind: NetworkPolicy
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metadata:
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name: mcp-server-policy
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spec:
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podSelector:
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matchLabels:
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app: mcp-server
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policyTypes: [Ingress, Egress]
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ingress:
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- from:
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- podSelector:
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matchLabels:
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app: agent-orchestrator
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ports:
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- port: 8080
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protocol: TCP
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egress:
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# Allow DNS
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- to:
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- namespaceSelector: {}
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ports:
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- port: 53
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protocol: UDP
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# Allow specific backends
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- to:
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- podSelector:
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matchLabels:
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app: postgres
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ports:
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- port: 5432
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protocol: TCP
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# Block cloud metadata (SSRF protection)
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# Azure IMDS: 169.254.169.254
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# AWS IMDS: 169.254.169.254
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# GCP metadata: metadata.google.internal (100.100.100.200)
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# These are blocked by default when no egress rule matches.
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```
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## gVisor / Kata Containers for Untrusted Servers
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For MCP servers that execute arbitrary code (code interpreters, shell tools),
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use a sandbox runtime like [gVisor](https://gvisor.dev/) or
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[Kata Containers](https://katacontainers.io/):
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```yaml
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# AKS with gVisor runtime class
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apiVersion: node.k8s.io/v1
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kind: RuntimeClass
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metadata:
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name: gvisor
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handler: runsc
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---
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apiVersion: v1
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kind: Pod
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metadata:
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name: mcp-code-interpreter
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spec:
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runtimeClassName: gvisor
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containers:
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- name: interpreter
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image: myregistry/code-interpreter:1.0@sha256:def...
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securityContext:
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allowPrivilegeEscalation: false
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readOnlyRootFilesystem: true
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capabilities:
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drop: ["ALL"]
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```
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On **Azure Kubernetes Service (AKS)**:
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- Enable the [Kata Container node pool](https://learn.microsoft.com/azure/aks/use-katacontainers) for VM-level isolation.
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- Use [Azure Container Instances (ACI)](https://learn.microsoft.com/azure/container-instances/) with Hyper-V isolation for per-tool ephemeral sandboxes.
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## File System Restrictions
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MCP tools should only access explicitly mounted paths:
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```yaml
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volumeMounts:
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- name: workspace
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mountPath: /workspace
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readOnly: false # only if tool needs write
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- name: config
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mountPath: /config
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readOnly: true
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```
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Combine with the `.NET SDK path traversal sanitization pattern`
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(`SanitizationDefaults.AllPatterns` detects `../` sequences) to prevent
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escape even if mounts are misconfigured.
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## Resource Limits
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Prevent a compromised tool from consuming cluster resources:
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| Resource | Recommendation |
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|----------|---------------|
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| CPU | 500m limit per tool pod |
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| Memory | 256Mi limit (512Mi for code interpreters) |
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| Ephemeral storage | 50Mi via emptyDir sizeLimit |
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| Process count | `pids-limit` cgroup (64 for simple tools) |
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| Network bandwidth | Use Cilium/Calico bandwidth annotations |
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## Checklist
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- [ ] Non-root user (`runAsNonRoot: true`)
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- [ ] Read-only root filesystem
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- [ ] All capabilities dropped
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- [ ] seccomp profile enabled (`RuntimeDefault`)
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- [ ] NetworkPolicy restricts ingress + egress
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- [ ] Cloud metadata IPs blocked (169.254.169.254)
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- [ ] Resource limits set (CPU, memory, storage)
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- [ ] gVisor/Kata for code execution tools
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- [ ] stdio transport where possible
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- [ ] Container images use SHA digest tags
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- [ ] `.NET SDK McpGateway` sanitization + response scanning enabled
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## Related
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- [McpGateway](../../packages/agent-governance-dotnet/README.md#mcp-protocol-support) — 5-stage governance pipeline
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- [McpSecurityScanner](../../packages/agent-governance-dotnet/README.md#mcp-protocol-support) — tool definition scanning
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- [OWASP MCP Security Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/MCP_Security_Cheat_Sheet.html)

‎packages/agent-governance-dotnet/AGENTS.md‎

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# Agent Governance .NET SDK — Coding Agent Instructions
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## Project Overview
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The .NET SDK provides **governance-as-code for AI agents** targeting .NET 8.0+. It integrates with ASP.NET Core, gRPC, and the official ModelContextProtocol C# SDK to enforce policy, security scanning, and audit logging at the MCP protocol layer.
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**Architecture:** GovernanceKernel (policy engine) + MCP governance stack
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- **GovernanceKernel:** Deterministic policy evaluation, action classification, middleware pipeline
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- **MCP Gateway:** 5-stage pipeline (deny-list → allow-list → sanitization → rate-limiting → human approval)
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- **MCP Security Scanner:** 6-threat detection with SHA-256 fingerprinting
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- **Extensions:** ASP.NET DI, middleware, health checks, IConfiguration, gRPC interceptor
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## Build & Test Commands
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```bash
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# Build the solution (all projects)
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cd packages/agent-governance-dotnet
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dotnet build
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# Run all tests
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dotnet test
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# Run tests with verbosity
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dotnet test --verbosity normal
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# Build samples
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dotnet build samples/McpGovernance.AspNetCore/McpGovernance.AspNetCore.csproj
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dotnet build samples/McpGovernance.OfficialSdk/McpGovernance.OfficialSdk.csproj
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```
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## Project Structure
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```
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packages/agent-governance-dotnet/
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├── AgentGovernance.sln
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├── src/
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│ ├── AgentGovernance/ # Core library (no MCP SDK dependency)
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│ │ ├── AgentGovernance.csproj
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│ │ ├── Core/ # GovernanceKernel, middleware, policy
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│ │ ├── Mcp/ # MCP protocol components
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│ │ ├── Extensions/ # ASP.NET, DI, config, gRPC, health
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│ │ └── Telemetry/ # OpenTelemetry metrics
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│ └── AgentGovernance.ModelContextProtocol/ # Adapter sub-package
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│ ├── AgentGovernance.ModelContextProtocol.csproj
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│ └── McpSdkGovernanceExtensions.cs
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├── tests/
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│ └── AgentGovernance.Tests/
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└── samples/
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├── McpGovernance.AspNetCore/
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└── McpGovernance.OfficialSdk/
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```
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## Coding Conventions
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- **Target:** .NET 8.0, C# 12
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- **Test framework:** xUnit 2.9.3 with `[Fact]` and `[Theory]`
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- **JSON:** `System.Text.Json` (never Newtonsoft)
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- **Crypto:** `System.Security.Cryptography` (HMAC-SHA256, SHA-256)
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- **Logging:** `ILogger<T>` via settable property (not constructor injection), matching existing `Metrics` pattern
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- **Telemetry:** `System.Diagnostics.Metrics` counters via `GovernanceMetrics`
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- **DI pattern:** `IServiceCollection` extensions returning the collection for chaining
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- **Fail-closed:** Any exception in governance pipeline → deny (never silent pass-through)
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- **Regex safety:** All compiled regexes must have `matchTimeout: TimeSpan.FromMilliseconds(200)` for ReDoS prevention
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- **Constant-time comparison:** Use `CryptographicOperations.FixedTimeEquals` for all secret comparison
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## Key Design Decisions
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1. **Core has no ModelContextProtocol NuGet dependency** — the adapter lives in `AgentGovernance.ModelContextProtocol` sub-package (Serilog/MediatR pattern)
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2. **HMAC-SHA256** instead of Ed25519 — .NET 8 lacks Ed25519 support
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3. **SortedDictionary** for schema hashing — ensures deterministic SHA-256 fingerprints
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4. **Nonce cache capped at 10,000** with oldest eviction to prevent memory exhaustion
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5. **Session limit checked under lock** — TOCTOU-safe concurrency for `McpSessionAuthenticator`
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6. **Properties use `set` not `init`** on `McpGovernanceOptions` — required for `IConfiguration` binding
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## OWASP MCP Security Coverage
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11 of 12 OWASP MCP Security Cheat Sheet sections covered. §11 (Consent UI) is client-side and out of scope for a server SDK.

‎packages/agent-governance-dotnet/AgentGovernance.sln‎

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