emilia-crewai

Guard CrewAI tools with the EMILIA Protocol — require an offline-verifiable authorization receipt (EP-RECEIPT-v1) before an irreversible tool runs.

missing receipt  -> refused
valid receipt    -> runs
replayed receipt -> refused   (one-time consumption)
forged receipt   -> refused

Verification is offline Ed25519 over canonical JSON via emilia-verify — zero network, no vendor in the loop. The approval becomes portable evidence an auditor can check without trusting the operator. It is necessary, not sufficient: it composes with — never replaces — your tool's own checks.

The base gate proves a pinned issuer signed an action-bound authorization claim. For a human-presence claim, require assurance_class="class_a" and supply an independent assurance verifier pinned to the relying party's keys, RP, and origins.

Install

pip install emilia-crewai          # brings in emilia-verify
pip install "emilia-crewai[crewai]" # also install CrewAI (optional peer)

Quick start

Gate a CrewAI BaseTool instance — its _run now requires a receipt:

from emilia_crewai import guard_crewai_tool, using_receipt

guard_crewai_tool(
    my_wire_tool,
    action="payment.release",
    trusted_keys=[ISSUER_SPKI_B64URL],     # pin the issuer keys you trust
    target_for=lambda to, amount: f"payment.release:{to}",  # optional per-call binding
    assurance_class="class_a",
    verify_assurance=verify_pinned_class_a_evidence,
)

# Bind the human-approved receipt for the agent step, then run as normal:
with using_receipt(receipt):
    crew.kickoff()        # my_wire_tool runs only with a valid, action-bound receipt

Or decorate a plain tool function:

from emilia_crewai import require_receipt, using_receipt

@require_receipt("payment.release", trusted_keys=[ISSUER_SPKI_B64URL])
def send_payment(to: str, amount: int) -> str:
    return do_transfer(to, amount)

Lower-level gate (verify -> reserve -> execute -> commit yourself):

from emilia_crewai import ReceiptGate
gate = ReceiptGate("payment.release", trusted_keys=[ISSUER_SPKI_B64URL])
result = gate.run(receipt, lambda: do_transfer(to, amount), target=to)

run() consumes the receipt after any execution attempt, including an exception: the external effect may have happened before its response was lost. Production fleets must pass an atomic, ownership-fenced {reserve, commit, release} store; the default is process-local. Call release() only when you can prove execution never began.

Multi-agent / quorum

For collective decisions (M-of-N agents or humans approving one action), EMILIA's quorum produces a single composite, offline-verifiable receipt. See the emilia_verify.verify_quorum primitive and draft-schrock-ep-quorum.

What it is / isn't

• Is: an offline gate for an action-bound issuer receipt, with an explicit Class-A/quorum verifier hook for independently established human ceremony.
• Isn't: authentication ("who is the agent"), access control, or a hosted runtime. It composes on top of whatever runtime you use.

Apache-2.0. Reference implementation, experimental. Part of the EMILIA Protocol — an open IETF-track authorization-receipt standard (draft-schrock-ep-authorization-receipts).