Claude Security: Protect Tool Use Agents
Drop-in security wrapper for the Anthropic Python SDK
Claude's tool use capability enables agents that interact with external systems — databases, APIs, file systems, and more. Rune wraps your Anthropic client transparently, scanning every message and tool use block for security threats. Claude's large context window means agents process more data per turn, increasing the attack surface for injected instructions.
Add Security in Minutes
from anthropic import Anthropic from rune import Shield from rune.integrations.anthropic import shield_client shield = Shield(api_key="rune_live_xxx") client = shield_client(Anthropic(), shield=shield, agent_id="my-agent") # Use exactly like a normal Anthropic client response = client.messages.create(...)
Full setup guide in the documentation
Why Anthropic Agents Need Runtime Security
Claude's 200K context window is a double-edged sword. Agents can process entire codebases, long documents, and complex multi-turn conversations — but that same window gives attackers more surface area to embed hidden instructions. A single malicious instruction buried in a 100-page document can hijack agent behavior for the rest of the conversation.
Top Threats to Anthropic Agents
Claude's 200K context window means agents ingest massive documents where attackers hide instructions deep in the text — far from where humans review. A buried directive at page 47 of a PDF can override the system prompt.
Claude's structured tool_use and tool_result blocks can be exploited to inject malicious parameters into tool calls or forge tool results that alter agent reasoning.
Attackers inject content early in a long conversation that influences Claude's behavior in later turns. The instruction persists across the entire context window.
What Rune Does for Anthropic
Transparent Client Wrapping
shield_client() returns a drop-in replacement. Same API, same message types, same streaming behavior. Your existing Claude integration works unchanged.
Tool Use Scanning
Every tool_use block Claude generates is scanned before execution. Text blocks, tool use blocks, and tool results are all validated against your security policies.
Large Context Protection
Rune scans the full content of messages — including long documents — for hidden injection attempts. Catches instructions buried deep in context that humans would miss.
Structured Block Validation
Claude's complex message structure (text blocks, tool_use blocks, tool_result blocks) is fully parsed and each block type is scanned with appropriate detection rules.
Common Anthropic Use Cases
- Claude-powered agents with tool use for enterprise workflows
- Document analysis agents processing large PDFs and reports
- Multi-turn conversational agents with persistent context
- Claude agents integrated into IDE extensions and developer tools
Other Integrations
Secure your Anthropic agents today
Add runtime security to your Anthropic agents in under 5 minutes. Free tier includes 10,000 events per month.