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Engineering notes from the guardrail

Architecture decisions, incident post-mortems and policy patterns from the team building the firewall for autonomous agents.

Latest posts

The 15ms budget: why agent guardrails must be faster than the agent

Every millisecond your policy engine adds is a millisecond your agent stalls. How we keep warm-path decision latency under 15ms while still evaluating cost, risk and compliance in parallel.

Engineering · 8 min read · Sep 9, 2026

Blast radius: the metric that should drive your agent permissions

Instead of asking “what can this agent do?”, ask “what happens when it does the wrong thing?” A practical framework for scoping tool access.

Security · 6 min read · Sep 2, 2026

Writing policies a non-engineer can audit

Plain-language rules are only useful if they are unambiguous to a machine. How we compile natural-language policies into deterministic decision graphs.

Product · 5 min read · Aug 26, 2026

Prompt injection is an authorization problem

Treating injected instructions as a permissions failure — not a prompt-engineered content filter — changes the whole architecture.

Security · 7 min read · Aug 19, 2026

Audit trails that survive a real incident review

Millisecond-level, tamper-evident records of every tool call: what to capture, what to redact, and how long to retain it.

Engineering · 9 min read · Aug 11, 2026

From sandbox to production: a staged rollout for autonomous agents

Shadow mode, dry-run, human-in-the-loop, then autonomous. A four-stage path that lets you ship capability without shipping risk.

Product · 6 min read · Aug 4, 2026

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