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potiuk merged 1 commit into from
Jul 15, 2026
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docs/setup/secure-agent-internals: three-layer → four-layer #879

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6 changes: 3 additions & 3 deletions docs/setup/secure-agent-internals.md
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@

- [Secure agent setup — how it works](#secure-agent-setup--how-it-works)
- [Threat model](#threat-model)
- [Three-layer defence](#three-layer-defence)
- [Four-layer defence](#four-layer-defence)
- [What `sandbox.enabled` actually does](#what-sandboxenabled-actually-does)
- [Linux: bubblewrap + user namespaces](#linux-bubblewrap--user-namespaces)
- [macOS: Seatbelt](#macos-seatbelt)
Expand Down Expand Up @@ -35,7 +35,7 @@ there. Read this document when you want to:

- understand the threat model the setup is built against, and
what it deliberately does not defend against;
- reason about which of the three layers (clean env / filesystem
- reason about which of the four layers (clean env / filesystem
sandbox / tool permissions / forced confirmation) is enforcing
any given guard;
- debug an unexpected denial (or worse, an unexpected *allow*) by
Expand Down Expand Up @@ -74,7 +74,7 @@ It does **not** defend against:
- A maliciously-crafted MCP server installed at user scope. Audit
`~/.claude/.mcp.json` and `~/.claude.json` periodically.

## Three-layer defence
## Four-layer defence

| Layer | Mechanism | What it stops |
|---|---|---|
Expand Down