ostler

Tend your documentation graph.

ostler is the single system-of-record for a repository's docs/ knowledge graph. It defines, validates, searches and mutates your planning docs — backlog items, milestones, epics, stories, seeds, features and specs — as plain markdown Concepts (a strict profile of the Open Knowledge Format).

Everything is markdown. An epic's seeds and its story dependency-DAG live inside its epic.md; there is no seed.json, dependencies.json, inventory.json or epics-todo.json. Ostler owns id allocation and is the one tool that reads and writes the graph — so structure stays consistent while humans (or agents) author the prose. The one-shot migration can consume and delete a legacy features/inventory.json; no Ostler command or Python API creates one.

It is a standalone, repo-agnostic CLI that operates relative to the current working directory: roots default to <cwd>/docs/{epics,features,specs} and the organization name to the repo folder name. Point it at any repo with -C/--chdir.

Install

pipx install ostler          # recommended: isolated CLI on your PATH
# or
pip install ostler

For development against a local checkout:

pipx install --editable /path/to/stablemate/ostler --force

The package installs one console entry point, ostler.

Quickstart

Ostler creates the structure and ids; you author the content into the skeletons it scaffolds.

# 1. See if the graph is healthy
ostler doctor

# 2. Capture intake and its release boundary (both allocate immutable ids)
ostler create backlog-item "Ship checkout parity" --section Scope --json
ostler create milestone checkout-mvp --title "Checkout MVP" \
  --source-items <full-backlog-id> --json

# 3. Scaffold an epic (allocates an id, writes docs/epics/0001-checkout-flow/epic.md —
#    the directory carries the order it was created in; `--json` reports the name it used)
ostler create epic checkout-flow --title "Checkout Flow at Parity"

# 4. Record a seed (a unit of intended work) in that epic's ## Seeds
ostler seed add checkout-flow address-step --status researched \
  --surface checkout/address --summary "Collect & validate the shipping address"

# 5. Cut a story that covers the seed (adds it to the epic's ## Stories, scaffolds story.md)
ostler create story checkout-flow 01-address-step \
  --title "Address step" --covers address-step

# 6. Ask what to work on next, then list the epic's stories as JSON
ostler next-story checkout-flow
ostler list --type story --epic checkout-flow --json

Then open the scaffolded epic.md / story.md and write the narrative, acceptance criteria, and prose — ostler keeps the seeds, edges, ids and queue coherent around it.

The hierarchy

A repository's knowledge lives under docs/ as OKF bundles (directories of markdown Concepts). A Concept is one .md file with a YAML frontmatter block (whose only hard requirement is a non-empty type) and a markdown body using conventional headings.

Identity is the path. A Concept's id is its bundle-relative path without .md (docs/features/profile/preference-summary.md → profile/preference-summary). The reserved filenames index.md (an ordered listing of a bundle) and log.md (history) are not Concepts.

Entity types

Epic directories carry their creation order — create epic checkout-flow writes docs/epics/0001-checkout-flow/, so a listing of docs/epics reads as the work order rather than as an alphabetized set. The number is not an identity (that is the minted id, which never changes), so the bare slug still names the epic in every command: ostler todo add checkout-flow, --epic checkout-flow, create story checkout-flow …. Use ostler path epic <slug> when you need the directory itself, and read --json's name back after create epic rather than assuming one.

spec.* Concepts are process artifacts: typed and conformance-checked, but ostler does not own their internal schema. The subtype is the file's stem (executive.md → spec.executive); mint them with ostler create spec <slug> <doc>, which is idempotent and also retro-stamps free-form docs. Not Concepts (managed markdown, left in place): docs/backlog.md (an identified intake list) and docs/epics/index.md (the epics queue).

Planning intake identity

Use create backlog-item for new work. It allocates a full id and writes - [<full-id>] <text> under the requested ## section. If a person has already entered plain bullets, backlog adopt assigns ids to every unnamed bullet without changing its prose or nesting. The grammar is intentional: every bullet in the backlog is an item. Supporting context and detail that should not acquire identity must be written as prose rather than as a list. Repeated adoption is a no-op. Pruning a parent refuses while any nested item remains, so one item's completion cannot silently discard another.

A milestone's generated id is independent of its readable filename and title. Its sourceItems contains the full ids of the backlog intake it owns. Use milestone set-source-items to update that set when an active milestone absorbs more intake. doctor rejects a backlog id owned by multiple milestones. Never persist a short handle: handles are display/input conveniences and may lengthen after a collision; Ostler resolves command inputs and writes full ids.

epic.md — single source of truth for an epic

An epic's epic.md carries the narrative and its seeds and story dependency-DAG. Ostler parses two canonical sections back out of the markdown by exact heading:

---
type: epic
id: ACME-01JBXR7K9QZ4M2T8VNF3HD6PWC
title: Account Credits "Aperçu" Billing Body at Legacy Parity
status: in-progress        # optional: planned | in-progress | done
---

Free narrative prose (any headings: ## Goal, ## Method, ## Acceptance, …).

## Seeds

### apercu-landing-body
- status: researched       # backlog | researched | covered | resolved | dropped | deferred
- surface: account-billing/apercu-billing-body
- legacySurface: /{_locale}/employe/profile/edit (BuyCreditsAction)
- backing: GET /billing/customer → CustomerDetails

The first paragraph after the metadata bullets is the seed summary; further prose is free markdown.

## Stories

### 01-apercu-billing-body
- title: Account Credits "Aperçu" Billing Body at Legacy Parity
- id: ACME-01JBXR7M4E0S9YCG5NAKQ2TZVJ
- covers: apercu-landing-body, apercu-subscription-change-plan-link
- depends on: (none)
- phase: 1
- effort: 8-10 hours

• ## Seeds → ### <seed-id> per seed (omit the whole section for a seedless epic).
• ## Stories → ### <slug> per story, carrying the edges: covers: (seed ids) and depends on: (sibling slugs). The detailed spec lives in the story's own story.md.

See SPEC.md for the authoritative, formal definition of every field, status enum, and conformance rule.

Command interface

All read commands accept --json. Mutating commands allocate ids as needed and write canonical markdown in place. ostler --version prints the version; -C/--chdir DIR runs any command as if from DIR; --handles / --full-ids choose how ids are printed (see Short handles — human output abbreviates, --json does not, and a handle is accepted as input either way).

edit is dry-run unless --write, so a rename across a whole graph is reviewable before it happens; create … --json returns {"ok": true, "id": "<allocated-id>", "name": "<name-on-disk>", "message": "…"} — name is what create epic numbered the directory, which is why it is reported rather than assumed.

Every verb, with its real flags and what each one operates on, is in docs/CLI.md.

The feature graph

Alongside the epic/story planning graph, ostler tends docs/features/ — a typed node/edge book describing a product's actual surfaces (screens, components, endpoints, flows). graph queries it, reach derives the documented click-path between two screens, locators emits the Playwright locator for every documented control, coverage joins the book's code: citations against a source inventory, and vet checks a rendered screenshot against what the book claims. The visual-fidelity contract is in docs/VET.md.

Verification control plane

ostler qa owns the bookkeeping of a QA run. qa context turns a base/head diff into a deterministic obligation scope for one story; qa validate and qa run then execute a version-2 plan that declares command, Playwright and Maestro targets and maps every scenario to acceptance-criterion and OKF obligation ids. Validation rejects unknown coverage, unsupported actions and locators, disposable pre-run inputs, literal secrets, and coverage without a machine assertion. Each run starts with an empty qa/, writes an append-only ledger and content-hashed manifest, and returns passed, failed, blocked, or invalid. ostler artifact schema-checks what a workflow produces (a plan, a review resolution, a QA outcome) against a registered contract.

ostler qa context --base <rev> --head WORKTREE --spec docs/specs/<story> \
  --source-root web=web --source-root api=api --story-file docs/epics/.../story.md
ostler qa validate docs/specs/<story>/qa-plan.yml --json
ostler qa run      docs/specs/<story>/qa-plan.yml --json

The run contract is in docs/QA-RUN.md, the artifact contracts in docs/ARTIFACT-CONTRACTS.md.

Python API

Everything the CLI does is available in-process through the Ostler facade — the library face of the tool (the analog of GitPython's Repo or PyGithub's Github). Prefer it over spawning the CLI and parsing its JSON when you're calling ostler from Python: you load the graph once and get back plain objects (dict/list/str, a Result, an EditPlan, a QaOutcome) instead of a subprocess and a stdout scrape.

from ostler import Ostler

okf = Ostler("path/to/repo")          # graph root discovered upward, like `-C DIR`; None ⇒ cwd
scoped = Ostler("path/to/repo", doc_roots={"epics": "product/epics"})

okf.todo()                            # ["checkout-flow", …]        (ostler todo list)
okf.list("story", epic="checkout-flow")   # [{"slug","status",…}]  (ostler list --type story)
okf.next_story("checkout-flow")       # {"slug": …} | None          (ostler next-story)
okf.spec_path("01-cart")              # "docs/specs/01-cart"        (ostler path spec)
okf.doctor()                          # {...} referential-integrity report (ostler doctor --json)

res = okf.create_story("checkout-flow", "02-pay", "Payment", covers=["seed-1"])
res.ok, res.entity_id                 # a Result, not parsed JSON   (ostler create story)
okf.update_story("02-pay", title="Payment", covers=["seed-1"], depends=["01-cart"])
item = okf.create_backlog_item("Ship checkout parity", section="Scope")
milestone = okf.create_milestone("checkout-mvp", "Checkout MVP", [item.entity_id])
okf.set_milestone_source_items("checkout-mvp", [item.entity_id])
okf.backlog_adopt("docs/backlog.md")  # name direct unnamed work bullets in place
okf.delete_story("02-pay")             # same mutation surface as `ostler delete story`
okf.delete_epic("checkout-flow")        # also removes milestone and legacy queue references
okf.set_status("01-cart", "QA passed")

doc_roots overrides configured roots for that facade's reads and mutations; relative values resolve from the discovered repository root. The loaded graph is a snapshot: reads reuse one cached load; a mutation (create_*/update_story/delete_*/add_seed/set_status/backlog_*/ set_milestone_*/todo_*/settle_review) applies against a fresh load and invalidates the cache, so the next read reflects it (reload() forces a refresh). A read never returns None — an unloadable graph raises. The QA/artifact/edit surface is on the same object (qa_context/qa_validate/qa_run/qa_context_validate, artifact_vet, settle_review), lazy-imported so a read-only caller never loads the QA/vet machinery. from ostler import load returns the bare Graph if you want the functional core directly.

ostler.markdown — the markdown parser everything reads through

The graph is markdown, so ostler.markdown is the one parser for it, and it is a public module: workhorse workflows, benchmarks and any other caller query documents through it rather than matching their own regexes. split(text) returns a MarkdownDoc carrying the parsed frontmatter (a real front-matter token, not a fence regex) alongside a byte-exact body — render() round-trips a document a human wrote without reflowing it.

from ostler import markdown

doc = markdown.split(path.read_text(encoding="utf-8"))
doc.frontmatter["type"]                    # YAML decided the types, not a line split
doc.find_section("Stories").bullets        # Bullet.label / .value / .bracketed
doc.find_bullet("status").value            # `- **Status**: Done` → "Done"
for table in doc.walk_tables():            # GFM pipe tables: .headers / .rows
    table.records                          # rows keyed by header; also .column("Type")
for label, href, line in markdown.iter_links(text):
    ...                                    # never a link inside a fence or code span

A heading, bullet, table row or link inside a fenced code block is not one — that falls out of the token stream rather than being approximated. Line numbers on Section and Table are 0-indexed and body-relative; doc.body_offset converts to a file line. The rule this serves, and the parser for every other format, is the structured-parsing skill in the base library; make check-parsers enforces it.

ostler.syntax — the same rule, for source code

The code side of the graph gets the same treatment: ostler.inventory answers "what does this file declare?" for the coverage join, doctor's code: citation grounding and the QA diff mapper, and all three read a parse, never a line match. Python goes through the stdlib ast; Go, TypeScript/TSX, PHP and Twig go through ostler.syntax, which is tree-sitter behind a four-function surface (parse / walk / text_of / lines_of).

tree-sitter rather than the target language's own toolchain, deliberately: ostler runs in agent containers and CI against repos it never builds, and okf-builder reads working trees mid-edit. A go build-shaped parser would need Go installed and the tree compiling, and the fallback that absence forces is a second grammar disagreeing with the first — the exact failure this module exists to end. tree-sitter is a prebuilt wheel, needs nothing from the repo it reads, and recovers from a syntax error instead of refusing the file.

What that buys, concretely: a commented-out export function is no longer a unit the book owes coverage for, a name inside a template literal no longer grounds a citation, and the shapes no pattern spelled — export abstract class, export const {a, b} = …, Go's grouped type (…) — are visible, so a correct citation stops failing with no way to fix it. Where a file is mid-edit, the region the parser could not read grounds any name it mentions; everywhere else stays exact.

The coverage model

story (epic.md ## Stories)  ->  covers: seed (epic.md ## Seeds)

ostler doctor checks OKF conformance (every Concept has a non-empty type) plus the typed referential-integrity contract:

• cross-epic references — an id/slug used inside epic E that only resolves in another epic;
• orphan seeds — an active seed no story covers;
• dangling references — a knowledge path or sibling slug that resolves to nothing;
• frozen drift — an approved (frozen) story/seed that changed or vanished.

It exits non-zero when any error-level finding is present, so it drops straight into CI or a pre-commit hook. Warning-level findings (e.g. story-covers-no-seed, ungrounded-surface) are reported but do not fail the check.

Id allocation

Ostler owns .agents/ids.json ({prefix, frozen}). create backlog-item|milestone|epic|story|feature allocates an id, scaffolds the canonical markdown, and (for stories) inserts the ### <slug> block into the epic's ## Stories. There is no external id allocator.

An id is <PREFIX>-<ULID> — the repo prefix (first four letters of the repo name, pinned on first use) plus a monotonic ULID: 26 Crockford-Base32 chars encoding a millisecond timestamp and 80 bits of randomness. It sorts by mint time and needs no coordination, so two worktrees, two processes or two clones never collide and there is no counter to lock or merge. (The former <prefix>-<n> counter could not be distributed; ids minted under it keep resolving — an id is an opaque string.)

Short handles

A 26-char id is not a thing anyone retypes, so ostler abbreviates it git-style to a handle — <PREFIX>-<6+ chars>, the shortest slice unambiguous among the ids currently in the repo:

ostler list --type seed                # ACME-K3XQ7P    ← handles, the default for human output
ostler list --type seed --json         # ACME-01JB…     ← full ids, the default for --json
ostler --full-ids list --type seed     # full ids in human output
ostler --handles  list --type seed --json

The split is the point: a person wants a token short enough to copy, while a program wants the identity that never changes. A handle lengthens the moment a colliding id is minted, so it is a display form — never what gets written into a document.

Input is not modal. A handle is accepted wherever ostler takes an id, in either mode and from either surface, so a token copied out of one command goes straight into the next:

ostler query stories-covering-seed ACME-K3XQ7P
ostler seed add checkout ACME-K3XQ7P --status resolved
ostler backlog prune ACME-K3XQ7P

The slice is of a hash of the ULID rather than of the id itself: monotonic ids minted in the same millisecond differ only in their low bits, and hashing decorrelates them so even a burst abbreviates to six characters. From Python, okf.handle(id) / okf.handles() render and okf.expand(token) resolves — though every ostler entry point already expands its own id arguments.

Profiles

ostler infers a profile from the tree: full when docs/epics exists (the epic/story/seed/ knowledge coverage graph), exploration otherwise (knowledge/docs only, no coverage graph). Override any default in an optional organization: block in ostler.yml / agents.yml at the repo root.

Templates (custom hierarchies)

The built-in types above (epic/story/knowledge/feature/spec) are fixed. For a different documentation shape — your own Concept kinds, nesting, required fields, status enums — declare it per-repo in .agents/templates.yml (git-tracked, alongside .agents/ids.json). A kind is live for new/find/set/remove/doctor the moment it's written — no separate activation step.

ostler template new    <name> [kind ...]        # declare a template, optionally with stub kinds
ostler template edit   <name> --set <kind>.<field>[.<subfield>]=<value>
ostler template find   [<name>]                 # list templates, or one template's definition
ostler template delete <name>
ostler template apply  <name>                   # mkdir -p each doc_root + inject CLAUDE.md guidance

Once a template's kinds are declared, use the same generic verbs against instances:

ostler new    <kind> <name> [field=value ...]   # <parent-kind>=<name> scopes nesting
ostler find   <kind> [<name>]
ostler set    <kind> <name> field=value ...
ostler remove <kind> <name>

See SPEC.md §9 for the full YAML schema, a worked 3-level nesting example, and the bundle-vs-leaf shape rules.

Versioning

The format is the OKF profile v1.0, versioned <major>.<minor>. Minor bumps add backward-compatible fields; major bumps may change required frontmatter or the epic.md grammar. A repo may record okf_version and ostler_profile in docs/epics/index.md.

License

MIT. See LICENSE.