**Your codebase's vocabulary, enforced — and your agents can't drift it.** Words and rulings live in a database; a tree-sitter scan checks every named thing your code declares against them — classes, structs, functions, types, modules, protocols — across twelve languages; a pre-write hook corrects your coding agent before drift ever lands. montology reads what your code *already declares* — every named thing in Python, TypeScript, Go, Rust, Swift, Java, Ruby, Elixir, C and C++ (and, where there is a UI, the Tailwind theme and the CSS) — and turns it into an ontology with a gate: drift fails CI with the file, the line, and the repair. It is a vocabulary layer for **all** of your code, not a styling tool; a repo with no UI in it uses every part of this except the last. ```sh # the CLI uvx --from "git+https://github.com/shinyobjectz/montology#subdirectory=.monty/cli" monty init # the agent skill (Claude Code, Cursor, and friends) npx skills add shinyobjectz/montology # npm (the launcher) npm install -g montology ```  ## Sixty seconds to a drift report ```sh cd your-repo monty init # .monty/, agent wiring, the pre-write guard hook monty explain # the X-ray: what this repo is, in one pass monty scan --candidates # the words your code is already asking for monty lint # the gate — every finding carries its repair monty config # what the gate enforces, and how to change it monty intake ask … # no words yet? the agent's `intake` skill asks the team # in a form, round by round, and ends in a glossary ``` ``` FAIL collision: struct 'Harness' at Sources/Runner.swift:14 is the word 'harness' — "the thing that runs a scenario end to end". Rename it, or record the exception: monty onto except harness --where … --why … FAIL divergence: type 'RowID' is declared as String (db/rows.ts:8) and as Int (api/rows.ts:12) — one noun, two things warn retired: 'pointer' was RENAMED to 'cursor' (the word moved when the UI stopped owning it). Name it 'cursor' — the old name stays retired. note design: rogue color #121212 ×2 (first at css/app.scss:37) — nearest token: ink #1b1b1f (Δ31) ``` Every finding names the file, the line and the repair. The first three are about the CODE — a struct wearing a word that means something else, a type declared as two different things, a name a ruling retired — and the last is the same contract applied to a hex code, which is a word that means one thing. If your repo has no UI you will never see that line. Where there IS a UI, the same machinery goes further: `monty design recipes` mines the class strings your markup repeats (`flex flex-wrap gap-2 items-center` ×102 — on shadcn/ui's own repo) so they can become *named* things. ## The firewall: your agent cannot write drift  Everything above is post-hoc. The guard runs **before the write**: `monty init` installs a pre-write hook in every harness it wires (merge-safe — `.claude/settings.json` and `.cursor/hooks.json`), and the plugin ships its own, so a plugin install is guarded without an init. It lints every proposed Write/Edit/NotebookEdit against the ontology in milliseconds — a declaration named after a **retired** word (renames are rulings; always blocks), a collision with an enforced word, a rogue hex when tokens exist. Deny is exit 2 with the repair on stderr: the harness feeds it straight back to the model, which corrects and retries. The agent *physically cannot* introduce a second gray or resurrect a renamed concept — it gets the token or the current word handed to it mid-edit. The guard **fails open** (malformed payload, no workspace, any internal error → allow silently) so it can never break an editor; humans in vim never meet it. `monty doctor` says, per harness, whether it is actually wired; `monty config guard.names block|warn|off` tunes it. ## `monty explain` — the one-shot conceptual X-ray  Point montology at any repo cold: one command composes the declared surface, the vocabulary it has, the vocabulary it is *asking for* (with definitions drafted on the atomic tier when one serves — law-checked, refused over wrong), **where meanings actually gather** (semantic clusters vs the directory tree's claimed architecture: cross-cutting concepts, grab-bag directories), the design system as measured, and every place the repo contradicts itself — straight to the terminal, because an instrument prints findings, it does not decorate them. ## The part that keeps you: words A repo's concepts drift exactly like its colors. montology's vocabulary is a **database, not a doc** — one word, one meaning, a one-line test, an optional dotted code — rendered into a generated agent skill and enforced against every declaration tree-sitter can parse (python, ts/tsx, js, go, rust, swift, elixir, ruby, java, c, c++):  ```sh monty onto check thread # FREE / TAKEN / RULED — before naming ANYTHING monty scan --candidates # the words your codebase is asking for monty onto add thread "a stateful user↔agent session" --code atl.thread --pos noun monty onto amend thread --definition "…" --why "a later ruling narrowed it" monty lint # collisions (advisory by default), code-tree # integrity, stale prose — each with its repair ``` Not every symbol sharing a word's name is drift, and treating them alike produces a list nobody reads. A word carries **what it names** — verb, noun, or value type — and the judgment follows from it: `Store.open` is English doing ordinary work below the surface, while a noun answering for a second thing is the failure a vocabulary exists to prevent. A collision you keep is a recorded decision, in the database with the rest of the vocabulary: ```sh monty onto except open --where "lib/**" --why "ordinary work below the surface" monty onto except --drafts # what an old [scan] allow list would become ``` What an exception can never do is silence a **divergence** — one value-typed word declared as two different values (`@type name :: term()` in one module, `@type name :: %{…}` in another). That is a separate law with a separate line: an exception says a *symbol* may share the name, not that the *name* may mean two things. Rulings end arguments permanently: **overloads** ("say cell, not sandbox"), **collisions** with frameworks (whose word it is, who moved), and **renames** — the old name retires, old material stays readable, and `monty migrate old new --apply` propagates the rename through the code by *token* (tree-sitter positions, strings and comments untouched, losslessly round-trippable — proven on eight real repos). When a ruling narrows a word you already authored, **`monty onto amend`** corrects the record in place: the name and its history stay, every field that changes is ledgered with the text it replaced, and an unknown name or a no-op is refused. Editing the database around the authoring path is the same drift the gate exists to catch. ## Meaning over time  Three instruments make a repo's meaning a *tracked quantity*: - **`monty vitals`** — the pulse: gate state, vocabulary state, design state, guard compliance → one verdict (**TENDED / DRIFTING / UNTENDED**) with every reason carrying its repair — plus whether the firewall is wired and the org upstream it inherits. `--json` is the dashboard shape; `--strict` exits 1 unless TENDED, so a repo can gate on its own tending. Track it per repo the way you track CI. - **`monty drift`** — the telescope: the git history sampled into lexicon, palette and convergence curves (`--csv` for the research lane). On excalidraw's full history the palette fragmented ~10× in two years (4→11→27→42 distinct colors) while declarations merely doubled. Flask's concept lexicon: 49 concepts in 15 years, flat since 2019. - **`monty guard --stats`** — repair-following, measured: every hook denial followed by a clean edit within 30 minutes is a complied denial. ## Semantic hearing  The string laws enforce *one word, one meaning*. The `[semantics]` extra hears the dual — *one meaning, one word* — with POTION static embeddings (~30 MB, numpy-only; no torch, no runtime): `monty onto audit` flags two words defined into the same idea, local words that duplicate inherited org words under different names, candidates that are secretly existing words, and owner groupings that don't match where meanings cluster. Advisory permanently — a cosine score proposes, only a ruling decides. ## One ontology, every repo The org's vocabulary is authored once — any montology workspace's `.monty/ontology.db` *is* the artifact — and inherited everywhere:  ```sh monty init --from git@github.com:acme/ontology.git # or a path, or a .db URL monty onto pull # refresh from the pin ``` Upstream rows refresh on every pull; local words always survive; a name defined in both places is a loud conflict (local wins — reconcile deliberately). When the org renames a word, every repo's next pull prints the exact `monty migrate` command: that is how a rename crosses the fleet. ## The two models it carries (and the ones it refuses) montology is deliberately near-modelless — the deterministic laws do the enforcing — but it carries exactly two, each chosen for a measured floor: | model | size | lane | what it does | what it refuses | |---|---|---|---|---| | **POTION** (`potion-base-8M`, model2vec) | ~30 MB, numpy-only | `[semantics]` extra | static embeddings over definitions: `onto similar`, `onto audit` — duplicate meanings, org/local doubles, misfiled clusters. Millisecond inference, no torch, no runtime. | deciding anything. A cosine score proposes; only a ruling makes vocabulary. | | **gemma3:270m** (via Ollama, optional) | 292 MB, user-installed | `monty gen ` | drafts ONE-LINE definitions under the word laws (refused over written wrong) when no host agent is present — the autonomous lane. | bodies and prose. The 270M capability floor is atomic one-liners; everything longer is the host agent's work or a served endpoint (`MONTOLOGY_MODEL_URL`). | Nothing heavier ships, ever: no torch, no onnxruntime, no bundled weights. The host agent (Claude, Cursor, Codex) is always the best drafter available, and the gate never needs a model at all. ## For agents `monty init` wires the repo for Claude Code, Cursor, and Codex (merge-safe: sections are appended, JSON keys merged, global config never touched) — MCP server, the instructions section, and the pre-write guard hook in each harness's own dialect. `monty doctor` reports which of those actually landed. Two skills ship: **`montology`** routes the work (new repo → set up, empty vocabulary → build one, working repo → the check-first contract), and **`intake`** runs the guided walkthrough for a codebase whose words were never written down. The generated **`words`** skill carries the whole vocabulary — words, tokens, recipes, rulings, doctrine — tiering into reference pages rather than truncating when it outgrows its budget. The MCP server exposes `ontology_check`, `ontology_add`, `ontology_amend`, `ontology_rule`, `ontology_similar`, `ontology_words`, `ontology_lint`, `scan_surface`, `scan_candidates`, `structural_search`, `repo_explain`, `repo_vitals` and `workspace_config`. Prose is rendered from the database, never authored; a stale render fails the build. ## Under the hood tree-sitter (via `tree-sitter-language-pack`) measures declarations and CSS structurally; ast-grep (invoked, one static binary) powers structural pattern search; SQLite holds the vocabulary. The stress battery (`stress/run.py`, weekly in CI) proves four properties on eight real repos — flask, excalidraw, gin, ripgrep, phoenix, sinatra, spring-petclinic, redis: merge-safe idempotent init, zero-error parsing, truthful collision reporting, and lossless migrate round-trips. ## The taxonomy library 62 public ontologies and taxonomies, licence-verified, grouped by domain. Browse with `monty onto sources [group]`. ### core — any business, any industry | ontology | licence | commercial | source | |---|---|---|---| | BFO — Basic Formal Ontology | CC BY 4.0 | yes — attribution | [`bfo`](https://obofoundry.org/ontology/bfo.html) | | DCMI Metadata Terms (Dublin Core) | CC BY 4.0 | yes — attribution | [`dublin-core`](https://www.dublincore.org/specifications/dublin-core/dcmi-terms/) | | NAICS (North American Industry Classification System) | US federal work — public domain (17 U.S.C. §105) | public domain | [`naics`](https://www.census.gov/naics/) | | PROV-O — the Provenance Ontology (W3C) | W3C Software and Document Licence | yes | [`prov-o`](https://www.w3.org/TR/prov-o/) | | QUDT — Quantities, Units, Dimensions and Types | CC BY 4.0 | yes — attribution | [`qudt`](https://github.com/qudt/qudt-public-repo) | | RO — the Relation Ontology | CC0 1.0 | public domain | [`ro`](https://obofoundry.org/ontology/ro.html) | | Schema.org vocabulary (types + properties) | CC BY-SA 3.0 | yes — share-alike | [`schemaorg`](https://schema.org/version/latest/schemaorg-current-https.jsonld) | | SIC codes | US federal work — public domain (17 U.S.C. §105) | public domain | [`sic`](https://www.sec.gov/corpfin/division-of-corporation-finance-standard-industrial-classification-sic-code-list) | | SKOS — Simple Knowledge Organization System (W3C) | W3C Software and Document Licence | yes | [`skos`](https://www.w3.org/TR/skos-reference/) | ### health & life sciences | ontology | licence | commercial | source | |---|---|---|---| | ChEBI — Chemical Entities of Biological Interest | CC BY 4.0 | yes — attribution | [`chebi`](https://obofoundry.org/ontology/chebi.html) | | Human Disease Ontology | CC0 1.0 | public domain | [`doid`](https://obofoundry.org/ontology/doid.html) | | Gene Ontology | CC BY 4.0 | yes — attribution | [`go`](https://obofoundry.org/ontology/go.html) | | Mondo Disease Ontology | CC BY 4.0 | yes — attribution | [`mondo`](https://obofoundry.org/ontology/mondo.html) | | NCI Thesaurus (OBO edition) | CC BY 4.0 | yes — attribution | [`ncit`](https://obofoundry.org/ontology/ncit.html) | | Uberon multi-species anatomy ontology | CC BY 3.0 | yes — attribution | [`uberon`](https://obofoundry.org/ontology/uberon.html) | ### finance | ontology | licence | commercial | source | |---|---|---|---| | FIBO — Financial Industry Business Ontology | MIT | yes | [`fibo`](https://github.com/edmcouncil/fibo) | ### retail & e-commerce | ontology | licence | commercial | source | |---|---|---|---| | Google Product Taxonomy | none — a bare .txt on www.google.com, no licence, no terms page, and developers.google.com's CC BY 4.0 site policy does not reach it | no — unlicensed | [`google-product`](https://www.google.com/basepages/producttype/taxonomy.en-US.txt) | | Shopify Product Taxonomy | MIT | yes | [`shopify-product`](https://github.com/Shopify/product-taxonomy) | ### advertising & media | ontology | licence | commercial | source | |---|---|---|---| | AdCOM — Advertising Common Object Model (IAB Tech Lab) | CC BY 3.0 (stated in the repo README, no LICENSE file) | yes — attribution | [`adcom`](https://github.com/InteractiveAdvertisingBureau/AdCOM) | | Google NLP Content Categories | CC BY 4.0 (Google Cloud docs) | yes — attribution | [`google-nlp-categories`](https://cloud.google.com/natural-language/docs/categories) | | Google Topics API Taxonomy | W3C Software and Document Licence | yes | [`google-topics`](https://github.com/patcg-individual-drafts/topics) | | IAB Ad Product Taxonomy 2.0 | CC BY 3.0 (as above) | yes — attribution | [`iab-adproduct`](https://github.com/InteractiveAdvertisingBureau/Taxonomies) | | IAB Audience Taxonomy 1.1 | CC BY 3.0 (as above) | yes — attribution | [`iab-audience`](https://github.com/InteractiveAdvertisingBureau/Taxonomies) | | IAB Content Taxonomy 3.1 | CC BY 3.0 (stated in the repo README, no LICENSE file — so every automated scan calls it unlicensed) | yes — attribution | [`iab-content`](https://github.com/InteractiveAdvertisingBureau/Taxonomies) | | The Open Graph protocol | Open Web Foundation Agreement 0.9 | yes | [`open-graph`](https://ogp.me/) | | OpenOOH Venue Taxonomy | Apache-2.0 | yes | [`openooh-venue`](https://github.com/openooh/venue-taxonomy) | | OpenRTB (IAB Tech Lab) | CC BY 3.0 (stated in the repo README, no LICENSE file) | yes — attribution | [`openrtb`](https://github.com/InteractiveAdvertisingBureau/openrtb) | | Curlie (the DMOZ successor) web directory | CC BY 3.0 Unported | yes — attribution | [`dmoz-curlie`](https://curlie.org/) | | IABTechLab/iab-mapper (2.x → 3.0 mappings) | BSD-2-Clause | yes | [`iab-mapper`](https://github.com/IABTechLab/iab-mapper) | | IPTC Media Topics | CC BY 4.0 — IPTC states it for all NewsCodes | yes — attribution | [`iptc-media-topics`](https://iptc.org/standards/media-topics/) | | IAB taxonomies as JSON (iPullRank) | MIT | yes | [`ipullrank-iab-json`](https://github.com/iPullRank-dev/iab-taxonomy) | ### agriculture & food | ontology | licence | commercial | source | |---|---|---|---| | AGRO — the Agronomy Ontology | CC BY 4.0 | yes — attribution | [`agro`](https://obofoundry.org/ontology/agro.html) | | FoodOn — the Food Ontology | CC BY 4.0 | yes — attribution | [`foodon`](https://obofoundry.org/ontology/foodon.html) | ### environment & climate | ontology | licence | commercial | source | |---|---|---|---| | ENVO — the Environment Ontology | CC0 1.0 | public domain | [`envo`](https://obofoundry.org/ontology/envo.html) | ### software & infrastructure | ontology | licence | commercial | source | |---|---|---|---| | AsyncAPI Specification | Apache-2.0 | yes | [`asyncapi`](https://www.asyncapi.com/docs/reference/specification/latest) | | CDEvents (Continuous Delivery Foundation) | Apache-2.0 | yes | [`cdevents`](https://cdevents.dev/) | | Conventional Commits | MIT | yes | [`conventional-commits`](https://www.conventionalcommits.org/) | | OWASP CycloneDX | Apache-2.0 | yes | [`cyclonedx`](https://cyclonedx.org/specification/overview/) | | JSON Schema | BSD-style (JSON Schema Specification Authors) | yes | [`json-schema`](https://json-schema.org/specification) | | OpenAPI Specification | Apache-2.0 | yes | [`openapi`](https://spec.openapis.org/oas/latest.html) | | OpenTelemetry Semantic Conventions | Apache-2.0 | yes | [`otel-semconv`](https://opentelemetry.io/docs/specs/semconv/) | | purl — Package URL specification | MIT | yes | [`purl`](https://github.com/package-url/purl-spec) | | Semantic Versioning | CC BY 3.0 | yes — attribution | [`semver`](https://semver.org/) | | SPDX — specification and licence list | Community Specification Licence 1.0; pre-existing portions CC BY 3.0 | yes — attribution | [`spdx`](https://spdx.org/licenses/) | | SWO — the Software Ontology | CC BY 4.0 | yes — attribution | [`swo`](https://obofoundry.org/ontology/swo.html) | | DOAP — Description of a Project | Apache-2.0 | yes | [`doap`](https://github.com/ewilderj/doap) | | OASIS TOSCA (Topology and Orchestration Specification) | Apache-2.0 | yes | [`tosca`](https://github.com/oasis-open/tosca-community-contributions) | ### security | ontology | licence | commercial | source | |---|---|---|---| | CVE — Common Vulnerabilities and Exposures | CC0 1.0 | public domain | [`cve`](https://www.cve.org/) | | CWE — Common Weakness Enumeration | MITRE royalty-free licence (research, development AND commercial; reproduce the copyright designation) | yes — attribution | [`cwe`](https://cwe.mitre.org/) | | MITRE D3FEND — defensive countermeasures | MIT | yes | [`d3fend`](https://d3fend.mitre.org/) | | MITRE ATT&CK | MITRE royalty-free licence (research, development AND commercial; reproduce the copyright designation) | yes — attribution | [`mitre-attack`](https://attack.mitre.org/) | ### AI, ML & data science | ontology | licence | commercial | source | |---|---|---|---| | Croissant — ML dataset metadata (MLCommons) | Apache-2.0 | yes | [`croissant`](https://github.com/mlcommons/croissant) | | EDAM — data, operations, formats and identifiers | CC BY-SA 4.0 | yes — share-alike | [`edam`](https://edamontology.org/) | | MITRE ATLAS — adversarial threats to AI systems | Apache-2.0 | yes | [`mitre-atlas`](https://atlas.mitre.org/) | | OpenTelemetry GenAI Semantic Conventions | Apache-2.0 | yes | [`otel-genai`](https://github.com/open-telemetry/semantic-conventions-genai) | | OWASP Top 10 for LLM Applications | CC BY-SA 4.0 | yes — share-alike | [`owasp-llm`](https://genai.owasp.org/llm-top-10/) | | STATO — the Statistical Methods Ontology | CC BY 3.0 | yes — attribution | [`stato`](https://obofoundry.org/ontology/stato.html) | ### geography | ontology | licence | commercial | source | |---|---|---|---| | GeoNames ontology + gazetteer | CC BY 4.0 | yes — attribution | [`geonames`](https://www.geonames.org/ontology/documentation.html) | ### trade & occupations | ontology | licence | commercial | source | |---|---|---|---| | Harvard Growth Lab classifications (ISIC/HS/SITC/O*NET) | BSD-3-Clause | yes | [`cid-classifications`](https://github.com/cid-harvard/classifications) | ### research & information | ontology | licence | commercial | source | |---|---|---|---| | DCAT — Data Catalog Vocabulary (W3C) | W3C Software and Document Licence | yes | [`dcat`](https://www.w3.org/TR/vocab-dcat-3/) | | IAO — Information Artifact Ontology | CC BY 4.0 | yes — attribution | [`iao`](https://obofoundry.org/ontology/iao.html) | ### general knowledge | ontology | licence | commercial | source | |---|---|---|---| | wikidata-taxonomy (extraction CLI) | MIT (the tool; Wikidata's own data is CC0) | yes | [`wikidata-taxonomy`](https://github.com/nichtich/wikidata-taxonomy) | ## Contributors ```sh git clone https://github.com/shinyobjectz/montology && cd montology uv sync && just # the action surface just check # the gate (montology lints itself, strictly: # its own toml sets collisions = "enforce") ```