typedstandards

Sign, withdraw, attest to, build views of and verify Typed Standards records from Python. The package drives @typedstandards/cli 0.2.0 as a child process. It holds no key, reads no signing seed, and computes none of the format's hashes: the CLI does all of the format's work.

Install

pip install typedstandards        # or: uv add typedstandards

The wheel carries the CLI and its dependencies (vendored at build time from this repository's package-lock.json), so installing needs nothing from npm. Running needs Node.js: the wrapper and the CLI need Node 20.19 or later, and a @typedstandards/host-core site build needs Node 22 or later.

The wrapper looks for Node in this order:

1. TYPEDSTANDARDS_NODE, when set: the path (or name on PATH) of a Node binary;
2. node on PATH.

Only the calls that run the CLI need Node: sign, withdraw, attest, view, verify, cli_version(), and show without a precomputed result. With no Node, or one older than 20.19.0, each of those raises typedstandards.NodeLocatorError, whose message names the floor and TYPEDSTANDARDS_NODE. pin, badge_cell, comparison_cell, sidecar and show(record, result) run without Node.

Linux and macOS are tested. Windows is untested.

The signing key

The CLI reads the signing seed (the standard base64 of a 32-byte Ed25519 seed) from one environment variable, TYPEDSTANDARDS_SIGNING_SEED_B64, and from nowhere else. The wrapper never reads it: it starts the CLI with the environment it inherited, and passes no environment of its own. Set the variable from a secret store for the process that signs, for example:

op run --env-file=signing.env -- jupyter lab

where signing.env maps TYPEDSTANDARDS_SIGNING_SEED_B64 to a secret reference. Make a new seed with:

openssl rand -base64 32

Only sign, withdraw and attest need it; view and verify do not.

Use

import typedstandards as ts

signed = ts.sign(
    {
        "type": "content/analysis/v1",
        "producerProfile": "scripted-recomputation/example",
        "captureMethod": "script-run",
        "prompt": "Recompute the summary table.",
        "promptVisibility": "full_text",
        "queries": [],
        "dataSources": [],
        "cost": {"model": "none"},
        "skillMetadata": {},
        "trace": {},
        "signer": {"bindingTier": "pseudonymous", "displayName": "Example analyst"},
    },
    output_file="analysis.ipynb",
)  # signed inline under raw-bytes/v1

bundle = ts.view(signed, visibility="public", title="Example analysis")
result = ts.verify(bundle)  # {ok, nodeId, failures, checks, lifecycle}

Each function returns the CLI's stdout parsed as JSON. An input may be a mapping (written as JSON to a temporary file the CLI reads) or the path of a JSON file.

Function	CLI command	Returns
sign(input, *, output_file=None, output_url=None, content_type=None)	sign	{package, envelopeHash, signature}
withdraw(input)	withdraw	{node, nodeId, signature}
attest(input)	attest	{node, nodeId, signature}
view(signed, *, visibility, attestations=(), trust_registry_url=None, package_url=None, title=None)	view	the commitment view, package inline
verify(input, *, blobs=(), full=True)	verify (--json when full)	{ok, nodeId, failures, checks, lifecycle}

The temporary files are removed before the function returns, whether the CLI succeeded or not. No input reaches the CLI through a pipe, where CLI 0.2.0 fails on a document larger than a pipe buffer holds. The CLI's README describes each command's inputs. What the CLI prints on stderr when it succeeds (attention readings, such as an offline registry_unavailable) is logged at INFO on the typedstandards logger.

typedstandards.CLI_VERSION is the version of the vendored CLI ("0.2.0"), and typedstandards.cli_version() asks the vendored CLI for it.

Errors

A non-zero exit raises a subclass of typedstandards.CliError, which carries exit_code, stderr (the CLI's standard error) and command:

Exit	Exception	Meaning
1	VerificationError	a record, or the CLI's own result, did not verify; for verify, .document is the {ok: false, ...} verdict
2	UsageError	an argument or an input is wrong
3	SeedError	the seed's variable is missing or malformed
4	InternalError	an internal error in the CLI

Verifying a served bundle

@typedstandards/host-core inlines a top-level trustRegistry in every bundle it serves under a registry, and CLI 0.2.0's verify refuses that key (typedstandards#136). Until the wrapper pins a CLI that accepts it, verify drops a bundle's top-level trustRegistry before the CLI sees the bundle, and changes nothing else. A test pins that the CLI receives the same document minus that one key.

Notebook helpers

Five helpers arrange and render around the CLI. None of them computes one of the format's hashes, reads the seed, or verifies anything itself.

import io
import pandas as pd
import typedstandards as ts

# Before signing: pin each input, and add the reader's badge and the comparison cell.
content, entry = ts.pin("https://data.example.org/resource/abcd-1234.csv", licence="CC-BY-4.0")
frame = pd.read_csv(io.BytesIO(content))

ts.badge_cell(
    "https://records.example.org/bundles/analysis.bundle.json",
    capture_method="script-run",
    notebook="analysis.ipynb",
)
ts.comparison_cell(
    "analysis.ipynb",
    {"rows": 1204, "mean_fare": 13.75},
    recompute="recompute_key_metrics()",
    captured_at="2026-10-03T12:00:00Z",
)

# Sign (record is an envelope input like the one under Use), then serve and show.
signed = ts.sign({**record, "queries": [entry]}, output_file="analysis.ipynb")
bundle = ts.view(signed, visibility="public", title="Example analysis")
ts.sidecar(bundle, "analysis.ipynb")  # writes analysis.ipynb.record.yaml
ts.show(bundle)  # in Jupyter; ts.show(bundle, marimo=True) in Marimo

• pin(url, *, licence=None, dataset_id=None, portal_metadata=None, save=None, ...) fetches url once and returns Pinned(content, entry): the response body, and a retrieval entry for the record's queries[] with url, sha256 (of the body), bytes, httpStatus and fetchedAt (ISO 8601 UTC) under arguments. A URL shaped like an open-data portal resource (…/resource/<id>[.ext] or …/api/views/<id>/rows.<ext>, <id> being xxxx-xxxx) gets a second request to <origin>/api/views/<id>, and the entry gains the portal's rowsUpdatedAt (epoch seconds) and datasetId. A response that is not 2xx raises. save= writes the bytes to that path and the entry to <path>.pin.json. The SHA-256 is the one digest the package computes: a signed assertion in queries[] that no check recomputes.
• badge_cell(bundle_url, *, capture_method, notebook=None, host=None, marimo=False) writes the verifier badge, linked to https://typedstandards.org/verify?url=<the bundle URL, percent-encoded> as @typedstandards/host-core writes it, above a two-row table (the host and the capture method). With notebook, it is inserted as the notebook's first cell (id typedstandards-badge on nbformat 4.5). With marimo=True, it returns the source of a mo.md(...) cell to paste into the app. The cell is written before signing and is part of the signed bytes, so it names no hash and no time; a URL or value holding a 64-hex string, a date or a time is refused. The URL's host and port are not read as a time (192.168.1.10:8080 is accepted).
• comparison_cell(notebook, values, *, recompute, captured_at) appends the comparison cell of spec §8.7.4 as the last cell (id typedstandards-comparison): the values as Python literals, current = <recompute>, and a loop that prints each delta. Values are None, bool, int, finite float, str, and lists and str-keyed dicts of those; anything else is refused.
• sidecar(view, artifact, *, directory=None) writes the commitment view as YAML (spec §8.8.3) beside the artifact: every field view printed except the inline package and a served bundle's trustRegistry, which are not §8.8.1 fields. The file is named <artifact's file name>.record.yaml, extension kept (analysis.ipynb.record.yaml): the spec's <artifact-basename> does not say whether the extension stays, and keeping it is the POSIX basename and cannot collide when two artifacts share a stem (analysis.ipynb beside analysis.py).
• show(record, result=None, *, role_path=("role",), marimo=False) renders a record (what view or sign printed) with its verify --json result: the type, the role, the signer, the hash, createdAt, the vcsRef (marked as asserted and not fetched), the status with its reason or successor, one line per check, and a sentence saying that verification does not say the analysis is correct. Without result it runs verify. In Jupyter it returns an object with _repr_html_; with marimo=True, mo.Html. The role is a signed assertion the signer made, read from the package's extensions at role_path (by default extensions["role"], a string or a list of strings); show labels it as the signer's and checks nothing about it.

The notebook helpers edit the notebook as JSON, splicing the new cell into cells so every other byte of the file stays as written. httpx is imported only inside pin, PyYAML only inside sidecar, and marimo only inside a Marimo call; IPython, marimo and nbformat are not dependencies.

Versions

Each wrapper release pins one CLI version exactly. A CLI upgrade reaches users as a wrapper release that moves the pin.

Development

See CLAUDE.md for the development loop and the checks CI runs.

License

MIT. The wheel also carries each vendored npm package's own licence file: five are MIT, and canonicalize is Apache-2.0.