agent-custody (Python)
Signed, verifiable receipts for AI agent tool calls, from Python. The key, the Cedar policy, and the Merkle log live in the agent-custody sidecar, a local process from the npm package; this client talks to it over HTTP with the standard library only.
npm install -g @agent-custody/receipts && agent-custody keygen --dir keys --name app
agent-custody serve --config sdk.json # loopback, port 8788
pip install agent-custody
from agent_custody import Client, PolicyDeniedError
client = Client() # http://127.0.0.1:8788/
refund = client.wrap("stripe.refund", lambda args: stripe.refund(**args))
refund({"amount": 5000}) # decide, run, record; raises PolicyDeniedError on deny
Adapters, each tested against the real package: agent_custody.langchain.ReceiptCallbackHandler (record-only), agent_custody.crewai.wrap_tools (enforce: each CrewAI tool becomes a CustodyTool with the same name, description, and schema whose run is decided, executed, and recorded; a denial is returned as the tool result), agent_custody.openai_agents.wrap_tools (enforce and record), agent_custody.claude_agent_sdk.claude_hook (PreToolUse deny, PostToolUse record). Receipts are verified by the TypeScript verifier; the tests do exactly that.
The memory tools. agent_custody.memory.MemoryClient (extra memory) talks to the shared memory server from @agent-custody/state over MCP: write, read, retract, history. Writes from here are claimed, quarantined until a gateway confirms them, and reads leave quarantined facts out unless asked; that is the honest position of an agent that did not go through the gateway.
async with MemoryClient("http://127.0.0.1:8790/mcp", token=os.environ["MEMORY_TOKEN"]) as memory:
await memory.write("acct:42", "plan", "pro", space="team:support", actor="py-agent")
await memory.read(subject="acct:42", include_claimed=True)
Everything recorded is claimed: the sidecar trusts what this process reports, the same as the in-process TypeScript SDK. For enforcement the agent cannot skip, put the gateway in front of the tools instead; it is an MCP server and needs nothing from this package.
uv run --extra test pytest # from packages/python; starts a sidecar with node from ../receipts
1 maintainer
Metadata
1 maintainer
Release files for agent-custody 0.6.13
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| agent_custody-0.6.13.tar.gz | 375.1 kB | Without provenance | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| agent_custody-0.6.13-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 385.8 kB
Release files / agent_custody-0.6.13.tar.gz
| Download URL | agent_custody-0.6.13.tar.gz |
|---|---|
| Size | 375.1 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
9dceaedbd8ab27d8f7542e05f551813307ba3c27392b100bf4493b62168c1ba5
|
|
BLAKE2b-256 checksum How to use checksums |
c0eacda2f1616ee1949938fc29af4d61f1fbd3783adda091c9758790575a1db5
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
No |
| Uploaded via |
uv/0.9.24 {"installer":{"name":"uv","version":"0.9.24","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"macOS","version":null,"id":null,"libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":null}
|
Release files / agent_custody-0.6.13-py3-none-any.whl
| Download URL | agent_custody-0.6.13-py3-none-any.whl |
|---|---|
| Size | 10.7 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
05824fe055f10c13a07d89a65e97d17fc5a95158643c596b9e6db741027d7e27
|
|
BLAKE2b-256 checksum How to use checksums |
74768552861ca5a78d387774071662229fc48aa8ce389bbf0da5fcebac7d8e4a
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
No |
| Uploaded via |
uv/0.9.24 {"installer":{"name":"uv","version":"0.9.24","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"macOS","version":null,"id":null,"libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":null}
|
Security for agent-custody 0.6.13
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
No provenance found
None of the files in this release were uploaded with provenance metadata.
A note on package security
PyPI is a repository for distributing packages, not a service for auditing them. While third-party security researchers and our staff do their best to detect and remove malicious packages, PyPI cannot guarantee the quality, security or suitability of any given package.
To learn more about protecting yourself from malicious actors, visit our package security documentation.
