mds-core (Python)

MDS — Markdown Document Schema: validate Markdown against .mds contracts from files, strings or streams with deterministic structure, types, constraints and LLM-readable semantic expectations.

Install

pip install mds-core        # or: pipx install mds-core (CLI only)
mds validate doc.md doc.mds

Coding examples

# Files
from mds import validate_files
r = validate_files("doc.md", "doc.mds")
print(r["exitCode"], r["stream"])

# Strings
from mds import validate_document
r = validate_document(doc_text=doc, schema_text=schema, doc_name="doc.md", schema_name="doc.mds")
print(r["exitCode"], r["stream"])

# Streams
import io
from mds import validate_streams
r = validate_streams(io.StringIO(doc_text), io.StringIO(schema_text))
print(r["exitCode"], r["stream"])

Skills for agents

mds skills install

This installs four skills for agent integration (Claude Code, Hermes, Kilo):

Skill	Purpose
`mds-validate`	Validate a document against a contract, repair until clean
`mds-write`	Generate a document from a contract, then validate
`mds-draft`	Derive a starter contract from an existing document (`mds draft`)
`mds-install`	Resolve or install the `mds` CLI when none is available

See the repository root README and the normative specification for details, the zero-config extension contract (entry-point group mds_ext) and conformance fixtures.

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