$ca-threat-model — STRIDE pass (opt-in)

Optional, lightweight pre-implementation security review for a sensitive change — new external endpoints, new secrets-handling paths, new auth/authz flows. Opt-in, not a routine gate: nothing routes here automatically. Invoke it when a change warrants the thought; skip it otherwise. Read-only — modifies no file. Describe what the component does, what data it handles, and which actors interact with it.

Routes to

security-architecture (routines/security-architecture/SKILL.md). The skill reads:

• <project-root>/.codearbiter/security-controls.md — compliance requirements.
• <project-root>/.codearbiter/decisions/ — existing security-relevant ADRs.

Output

## Scope
<what is being analyzed>

## STRIDE findings
| Threat | Category    | Likelihood | Impact | Control                      |
|--------|-------------|------------|--------|------------------------------|
| ...    | S/T/R/I/D/E | H/M/L      | H/M/L  | <control or NONE — needs one> |

## Recommended controls before implementation
- <control 1>

## Clearance
CLEAR TO IMPLEMENT | BLOCKED — resolve findings first

When NOT to use

• Reviewing already-written code → $ca-review.
• A full cross-cutting review → $ca-checkpoint.
• A security question → $ca-btw.

Hard gate

Read-only — modifies no file. This is an advisory pass, not a routine gate; it never runs unless invoked.