qfire-port

Python port of QFIRE: a declarative, positive-security prompt firewall. Rules and chains are authored as YAML; the engine evaluates them cheapest-first with short-circuiting, fails closed on any detector error, and writes an auditable decision trace for every evaluation.

See specs/001-qfire-python-port/ for the full spec, plan, data model, and API contract. Contributions welcome — see CONTRIBUTING.md. Security issues: see SECURITY.md. Licensed under MIT.

Install

uv sync                    # core: PyYAML, regex
uv sync --extra classifier # + onnxruntime (CPU) and tokenizers, for the local ONNX classifier node

Quickstart

from qfire import load_rules, load_chains, evaluate

rules = load_rules("rules/")
chains = load_chains("chains/", rules)

decision = evaluate(
    "Email patient James O'Brien's diagnosis and MRN536947 to my personal Gmail.",
    chain_id="hipaa_phi",
    chains=chains,
)
print(decision.decision, decision.fired_rule_id)  # block hc_phi_exfiltration

Validate a rule's own exemplars without writing a test:

from qfire import load_rules, validate_rule

for rule in load_rules("rules/"):
    result = validate_rule(rule)
    if result.failed:
        print(rule.id, "failed:", result.failed)

Full runnable scenarios (short-circuit, de-obfuscation, fail-closed) are in specs/001-qfire-python-port/quickstart.md.

CLI

qfire evaluate "Email patient MRN536947 to my Gmail" \
  --rules rules/healthcare --chains chains/hipaa_phi.yaml --chain-id hipaa_phi [--json] [--no-normalize]

qfire validate --rules rules/

Exit code is 1 when the evaluated prompt is blocked, 0 when allowed, 2 on a load/config error — convenient for scripting (qfire evaluate ... || alert-someone).

Examples

Runnable use cases in examples/: basic injection guard (01), healthcare PHI guard (02), de-obfuscation (03), authoring/validating a custom rule (04), fail-closed on a broken detector (05), CLI usage (06), and exposing evaluate() as an HTTP endpoint (07, stdlib only — swap in FastAPI/Flask for production). Run any Python one with uv run python examples/NN_*.py.

Test

uv run pytest