Agent-First Data for Python
pip install agent-first-data
from agent_first_data import json_result, render, OutputFormat
value = json_result(
{
"api_key_secret": "sk-123",
"latency_ms": 1280,
"db_url": "postgres://user:p@ss@db/app?token_secret=abc",
}
).build()
print(render(value, OutputFormat.JSON))
print(render(value, OutputFormat.PLAIN))
Useful names use Python casing: render (the single value x format x options -> str entry point; takes an OutputFormat and an optional keyword-only options=), redacted_value, redact_url_secrets, redact_urls_in_text, redact_argv, normalize_utc_offset, is_valid_rfc3339_date, is_valid_rfc3339_time, is_valid_rfc3339, is_valid_bcp47, cli_parse_output, build_cli_error, build_cli_version, decode_protocol_event.
Behavior Notes
- Default redaction replaces every
_secretor configured secret-name subtree with***, including objects and arrays. _urlfields scrub userinfo passwords and secret-named query parameters; surrounding whitespace is trimmed and internal whitespace redacts the whole field.OutputOptions.url_namesapplies URL treatment to exact legacy field names and recurses through collections.redact_urls_in_textis explicit and scans only complete scheme URLs, never arbitrary prose secrets.- YAML keeps original keys and values (structure-preserving, like JSON), sorting keys by UTF-16 code unit order and quoting/escaping unsafe keys and string scalars. Plain strips formatting suffixes, formats values, sorts the same way, and renders nested objects/arrays as canonical JSON.
- Logging records use
kind:"log"with a nestedlogpayload and a separatelevelfield, so error-level logs are not terminal protocol errors. build_cli_error(message, hint?)returns a strict-ready CLI error witherror.retryable:falseandtrace:{}.- Do not add a raw version/help pre-parser. Until the Python
CliSpeccompiler lands, applications should keep lifecycle parsing in their own parser rather than claim AFDATA closed-world help compatibility.
Reference
- Formal cross-language contract: spec/agent-first-data.md
- Conformance fixtures: spec/fixtures
- Agent skill: skills/agent-first-data/SKILL.md
1 maintainer
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