Reference engagement
Prompt Injection Defense & Tool Authorization
Make agentic systems safe: strict tool boundaries, least privilege, and robust input handling.
// Delivery pattern
This page describes a representative engagement of this shape — how the system is scoped, built, and handed over. Specific figures reflect typical outcomes of the pattern when delivered with the operational discipline described on the About page. Named customer engagements are shared under NDA on request.
Engagement shape
Typical outcomes
- ✓ Safer tool use
- ✓ Reduced unauthorized actions
- ✓ Stronger governance
Stack
- — Allowlists
- — Authorization
- — Validation
- — Sandboxing (optional)
Typical timeline
2–4 weeks
kick-off to handover
Risks & guardrails
- Testing gaps — run adversarial abuse tests across all tool types before launch
- Allowlist false positives — tune with real usage patterns, not synthetic examples
Problem
Prompt injection is not just “bad prompts” — it’s a systems problem. When models can call tools (APIs, databases, actions), an attacker can try to steer the model into unsafe behavior: leaking data, escalating privileges, or executing unintended operations.
Solution
We enforce hard controls outside the model:
- Tool allowlists and scoped permissions (least privilege)
- Input validation and output sanitization
- Authorization checks per action (who/what/why)
- Safe fallbacks and incident-ready logging
Architecture (practical pattern)
- Model → Tool Router (policy engine) → Approved Tools
- Each tool call is validated, authorized, and logged
- Sensitive outputs are redacted and access-controlled
Implementation steps
- Inventory tools and classify risk levels
- Define permissions per role and per environment
- Build a policy gate (allowlist + constraints)
- Add validation, sanitization, and safe defaults
- Add monitoring and “abuse tests”
Measurement (typical)
- Fewer high-risk tool calls reaching execution
- Increased coverage of tool calls with authorization + logging
- Clear audit trail for tool actions
CTA
If your assistant can “do things”, harden it. We’ll help you ship safe tool-use.
Related patterns
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