microsoft--agent-framework/python/samples/02-agents/security/README.md

FIDES security samples

This folder contains runnable FIDES samples. Keep this README as the quick entry point for choosing and running a sample; use FIDES_DEVELOPER_GUIDE.md for the architecture, security model, middleware behavior, and API reference.

What each sample demonstrates

Sample	Focus	Demonstrates
email_security_example.py	Prompt injection defense	SecureAgentConfig, Foundry-backed email handling, quarantined_llm, and approval on policy violations
repo_confidentiality_example.py	Data exfiltration prevention	Confidentiality labels, Foundry-backed repository access, max_allowed_confidentiality, and approval before leaking private data
github_mcp_example.py	Remote MCP URL with local FIDES enforcement	SecureMCPToolProxy(url=...), direct GitHub MCP access, tool auto-labeling, and post-tool-call policy enforcement

Prerequisites

Run these samples from the python/ directory with the repo development environment available.

• Azure CLI authentication: az login
• FOUNDRY_PROJECT_ENDPOINT set in your environment
• FOUNDRY_MODEL set in your environment for the main agent deployment
• Local dev environment installed (for example, uv sync --dev)

These samples use Foundry for the main agent and keep the quarantine client pinned to gpt-4o-mini where applicable.

For github_mcp_example.py, set:

• GITHUB_PAT (GitHub Personal Access Token)
• FOUNDRY_PROJECT_ENDPOINT (Foundry project endpoint)
• FOUNDRY_MODEL (optional model override)

Suppressing the experimental warning

The FIDES APIs in these samples are still experimental. Each sample includes a short commented warnings.filterwarnings(...) snippet near the imports. Uncomment it if you want to suppress the FIDES warning before using the experimental APIs locally.

Running the samples

email_security_example.py

This sample simulates an inbox containing trusted and untrusted emails, including prompt-injection attempts that try to force a privileged send_email tool call.

Run it with:

uv run samples/02-agents/security/email_security_example.py --cli
uv run samples/02-agents/security/email_security_example.py --devui
uv run samples/02-agents/security/email_security_example.py --cli --debug

When you run the DevUI variant, the sample prints the active DevUI bearer token before starting the server.

Add --debug to enable verbose tool and security middleware logging.

What to look for:

• Untrusted email bodies are handled through the FIDES security flow
• quarantined_llm processes hidden content in isolation
• DevUI requests approval if the agent tries a blocked privileged action

repo_confidentiality_example.py

This sample simulates a public issue that tries to trick the agent into reading private repository secrets and posting them to a public channel.

Run it with:

uv run samples/02-agents/security/repo_confidentiality_example.py --cli
uv run samples/02-agents/security/repo_confidentiality_example.py --devui

When you run the DevUI variant, the sample prints the active DevUI bearer token before starting the server.

What to look for:

• Reading public content keeps the context public
• Reading private content taints the context as private
• Posting private data to a public destination triggers an approval request

github_mcp_example.py

This sample connects directly to https://api.githubcopilot.com/mcp/ through MCPStreamableHTTPTool, then wraps the MCP client in SecureMCPToolProxy so FIDES middleware can inspect tool results and enforce policy locally. The X-MCP-Features: ifc_labels header is passed to opt in to server-side IFC label emission in tool result _meta.

Run it with:

uv run samples/02-agents/security/github_mcp_example.py --cli
uv run samples/02-agents/security/github_mcp_example.py --cli --attack
uv run samples/02-agents/security/github_mcp_example.py --devui
uv run samples/02-agents/security/github_mcp_example.py --devui --debug

What to look for:

• MCP tools are auto-labeled from remote annotations
• Untrusted tool output is tracked by FIDES label middleware
• Attack-mode write attempts can trigger policy enforcement or approval

Where to find the details

For the full FIDES design and API details, see FIDES_DEVELOPER_GUIDE.md, which covers:

• integrity and confidentiality labels
• label propagation and auto-hiding behavior
• policy enforcement middleware
• security tools such as quarantined_llm and inspect_variable
• SecureAgentConfig and manual integration patterns