agledger 0.8.7

AGLedger SDK — Accountability and audit infrastructure for agentic systems.

AGLedger Python SDK

The official Python SDK for AGLedger — accountability infrastructure for AI agents. Self-hosted. The Layer 3 accountability layer of the agent stack.

Learn more

• agledger.ai — what AGLedger is and why Layer 3 accountability matters
• How it works — the four-endpoint lifecycle: Record, Completion, Verdict, fulfill
• Glossary — canonical definitions of Record, Completion, SCITT Receipt, Verdict, Settlement Signal
• Documentation — installation, integration guides, API reference
• Protocol (AOAP) — the coordination language behind AGLedger

Install

pip install agledger

Quick Start

import os
from agledger import AgledgerClient

client = AgledgerClient(
    api_key=os.environ["AGLEDGER_API_KEY"],
    base_url=os.environ["AGLEDGER_EXTERNAL_URL"],  # your AGLedger instance URL
)

# Create a Record. An agent key defaults the principal to itself; an admin
# key names the principal explicitly via principal_agent_id.
record = client.records.create(
    type="ACH-PROC-v1",
    contract_version="1",
    platform="internal",
    performer_agent_id="agt-123",
    criteria={"item_spec": "widgets", "quantity": {"target": 100}},
)

# Activate it
client.records.transition(record.id, "activate")

# Submit a completion
completion = client.completions.submit(
    record.id,
    evidence={"deliverable": "/out.pdf", "deliverable_type": "file_ref", "quantity_supplied": 95},
)

# Principal verdict
client.records.submit_verdict(record.id, completion_id=completion.id, verdict="accept")

Configuration

client = AgledgerClient(
    api_key="agl_agt_...",                              # or set AGLEDGER_API_KEY env var
    base_url="https://agledger.internal.example.com",   # your instance URL
    max_retries=2,                                      # default: 2
    timeout=30.0,                                       # default: 30s
)

Async Support

from agledger import AsyncAgledgerClient

async with AsyncAgledgerClient() as client:
    record = await client.records.get("rec-123")

Resources

records, completions (formerly receipts), verification, disputes, webhooks, reputation, events, schemas, compliance, health, admin (with admin.records + admin.vault sub-resources), a2a, agents, audit (with audit.org_reads_checkpoints and audit.vault_checkpoints), auth, capabilities, discovery, references, federation, federation_admin, verification_keys, scitt (SCITT/SCRAPI entries + Transparency Service keys), predicates (predicate schema discovery).

Webhook Verification

Webhooks ship in two signing schemes, selected per subscription via signing_alg.

HMAC (signing_alg="hmac", the default) — shared-secret HMAC-SHA256:

from agledger.webhooks import verify_signature

is_valid = verify_signature(raw_body, request.headers["x-agledger-signature"], webhook_secret)

Ed25519 (signing_alg="ed25519") — RFC 9421 HTTP Message Signatures signed with the Server's vault key. The receiver holds no secret and verifies against the Server's published public key, giving non-repudiation for the Settlement Signal hop. Settlement-event subscriptions default to this when the Server has a vault signing key.

from agledger.webhooks import verify_rfc9421

# Resolve the Server's published keys once (cache them); the delivery's
# keyid is matched against them automatically.
keys = client.verification_keys.list().data

is_valid = verify_rfc9421(
    request.headers,  # must include content-digest, signature-input, signature, x-agledger-idempotency-key
    raw_body,
    keys,             # or a single base64 public key string
)

verify_rfc9421 recomputes the RFC 9530 Content-Digest, reconstructs the RFC 9421 signature base, verifies the Ed25519 signature, and enforces the created replay window (default/max 300s). construct_event_rfc9421 verifies and parses in one step. The ed25519 path needs the cryptography extra (pip install 'agledger[verify]').

Offline Audit Export Verification

Verify a Record's hash-chained, Ed25519-signed audit export without calling the API:

from agledger.verify import verify_export

export_data = client.records.get_audit_export("rec-123")
result = verify_export(export_data.model_dump(by_alias=True))

if not result.valid:
    print(f"Broken at position {result.broken_at.position}: {result.broken_at.code}")
# VerifyExportResult(valid=True, verified_entries=12, total_entries=12, ...)

broken_at.code is a canonical SCREAMING_SNAKE FailureCode (e.g. CHAIN_HASH_MISMATCH, CHAIN_SIGNATURE_INVALID) shared with the TypeScript verification core, so both languages report identical verdicts over the shared conformance corpus.

Requires cbor2 (for COSE_Sign1 decoding) and cryptography (for Ed25519 verification):

pip install 'agledger[verify]'

Rewritten in 0.8.0 to decode canonical COSE_Sign1 envelopes (RFC 9052), walk the hash chain, and verify Ed25519 signatures. Format 2.0 (was 1.0 JCS + detached Ed25519). Pass public_keys={...} to supply out-of-band keys (these override the export's embedded keys), require_key_id="key-id" to reject exports signed by an unexpected key, or require_out_of_band_keys=True for a high-assurance audit that refuses the export's own embedded keys. result.key_provenance reports how many signatures were checked against out-of-band vs embedded keys.

SCITT / SCRAPI

Register Signed Statements with the Transparency Service and retrieve Transparent Statements (Signed Statement + Receipt(s)):

receipt = client.scitt.entries.register(signed_statement)
# COSE_Sign1 Merkle inclusion proof per draft-ietf-cose-merkle-tree-proofs-18

transparent = client.scitt.entries.get(entry_id)
# Transparent Statement: Signed Statement with one or more Receipts embedded

keys = client.scitt.keys.list()
# COSE_KeySet of the Transparency Service's signing keys

Wire format is binary application/cose. Errors surface as RFC 9290 CBOR problem-details on APIError.raw_body.

Predicate Schemas

Fetch the canonical JSON Schemas for each predicate kind (record-state, settlement-signal, vault-checkpoint, schema-event, org-read, counter-attestation, federation-projection):

kinds = client.predicates.list()
schema = client.predicates.get("settlement-signal")

Attestation Export

Pull a Record's chain as a tagged COSE_Sign1 stream or a sigstore-bundle v0.3.2 projection for Rekor / in-toto / sigstore-policy-controller ingest:

cose_sequence = client.records.get_attestation(record_id)
# application/cose-sequence bytes (tagged COSE_Sign1 stream)

bundle = client.records.get_attestation_bundle(record_id)
# sigstore-bundle v0.3.2 projection

Vault Checkpoints

Per-record signed Merkle anchors are emitted every 6 hours, letting an auditor detect audit-vault TRUNCATE / DELETE tampering offline:

checkpoints = client.audit.vault_checkpoints.list(record_id="rec-123")

Licensing

AGLedger is free for single-node deployments (Docker Compose with bundled database). An Enterprise License is required for external database connections, federation, and multi-node deployments.

Full details: agledger.ai/pricing | License Agreement

SDK License

Proprietary. Copyright (c) 2026 AGLedger LLC. All rights reserved.