Configuration

Arcantry uses the same schema for shared arcantry.toml and private .local/arcantry.toml. Configuration is optional.

Resolution precedence

Arcantry selects one file:

1. --config <path> selects an explicit file.
2. Otherwise, each directory from the working directory toward the filesystem root is checked for .local/arcantry.toml, then arcantry.toml.
3. The first match is active. A sibling file at that boundary is reported as shadowed.
4. Without a match, Arcantry uses configuration-free discovery.

Configurations are never merged. A private configuration resolves its default project root from the directory that contains .local, not from .local itself.

Minimal configuration

config_version = 1

[toml-schema]
location = "https://mrmaxie.github.io/arcantry/schemas/arcantry-config-v1.tosd"
version = "1.0.0"

repo init --scope shared creates this contract in arcantry.toml. repo init --scope private creates it in .local/arcantry.toml.

Source example

config_version = 1

[toml-schema]
location = "https://mrmaxie.github.io/arcantry/schemas/arcantry-config-v1.tosd"
version = "1.0.0"

[tool]
requires = ">=1.0.0 <2.0.0"

[sources.intent]
kind = "openspec"
path = "openspec"
management = "manage"
adapter = "openspec@1"
scope = "."

[sources.history]
kind = "changelog"
path = "CHANGELOG.md"
management = "manage"
adapter = "keep-a-changelog@2"
from = ["intent"]
managed_from = "1.0.0"

[sources.tasks]
kind = "todo-txt"
path = ".local/todo.txt"
management = "observe"
adapter = "todo-txt@1"
visibility = "private"

[release]
adapter = "openspec-release@1"
manifests_path = "releases"
changelog_source = "history"
tag_prefix = "v"
repository_url = "https://github.com/example/project"

[[release.version_sources]]
path = "Cargo.toml"
adapter = "cargo-workspace@1"

The equivalent private intent and release sources use .local/openspec and .local/CHANGELOG.md. They can be configured explicitly or discovered without configuration.

Top-level fields

Field	Required	Contract
config_version	Yes	Configuration format version. The value is 1.
[toml-schema].location	No	URL or path used by editors to find the TOML Schema.
[toml-schema].version	No	Full SemVer version of that schema.
[tool].requires	No	SemVer range the running Arcantry version must satisfy.
[project].root	No	Project root relative to the configuration boundary.
[sources.<id>]	No	One independently versioned knowledge source.
[release]	No	Local OpenSpec-backed release planning and rendering.

Source fields

Field	Required	Default	Contract
kind	Yes	-	openspec, changelog, or todo-txt.
path	Yes	-	Source path, normally relative to the project root.
management	No	observe	ignore, observe, validate, or manage.
adapter	Yes	-	Versioned adapter id in <name>@<integer-version> form.
from	No	[]	Source ids that provide semantic input to this source.
managed_from	No	-	Full SemVer boundary for managed changelog meaning.
visibility	No	Path-based	private for .local paths, otherwise shared.
scope	No	.	Project scope governed by an OpenSpec authority.

Relationships and privacy

from relationships form an acyclic graph. A managed changelog requires at least one OpenSpec source. Shared and private OpenSpec authorities can govern the same project scope independently, but authorities with the same visibility cannot overlap.

Project-local configuration rejects absolute source paths. An explicit external configuration may use them. A source inside .local is private and cannot be declared shared.

Shared and private source content is not synchronized automatically. Use inspection and an explicit transition plan to promote, relocate, or preserve it.

A shared changelog cannot depend on private OpenSpec because collaborators could not reproduce that release meaning. A private changelog may depend on shared OpenSpec, private OpenSpec, or both.

Release fields

Field	Required	Default	Contract
adapter	Yes	-	openspec-release@1 or the opt-in openspec-release@2.
topology	v2 only	single	single, independent, or composed.
manifests_path	Single only	-	Directory containing <version>.yaml release manifests.
changelog_source	Single only	-	Id of the managed changelog source for the release.
tag_prefix	Single only	v	Prefix used only for generated changelog links.
repository_url	No	-	Repository URL used for comparison links. Links are omitted when absent.
version_sources	Single only	-	One or more explicit path and adapter tables.
units	Multi-unit only	-	Named release-unit tables for independent and composed.

openspec-release@1 keeps the original single-release contract unchanged. openspec-release@2 with no topology also uses the flat single-release shape. Multi-unit configurations move manifest, changelog, tag, version-source, selector and dependency ownership into each unit:

[release]
adapter = "openspec-release@2"
topology = "composed"

[release.units.core]
manifests_path = "releases/core"
changelog_source = "core_history"
tag_prefix = "core/v"

[[release.units.core.version_sources]]
path = "packages/core/package.json"
adapter = "json-package@1"

[[release.units.core.selectors]]
source = "shared_openspec"
components = ["product:core"]

[release.units.app]
manifests_path = "releases/app"
changelog_source = "app_history"
tag_prefix = "app/v"
dependencies = ["core"]

[[release.units.app.version_sources]]
path = "apps/app/package.json"
adapter = "json-package@1"

[[release.units.app.selectors]]
source = "shared_openspec"
components = ["product:app"]

An independent topology forbids dependencies. A composed topology requires an acyclic dependency graph with at least one edge. Paths, changelog sources, version-source paths and tag prefixes are owned by exactly one unit.

Every selector names an OpenSpec source used by the unit’s changelog. Omitting components claims the whole source exclusively. Component selectors may split a shared OpenSpec source between units, but ownership cannot overlap. A release-bearing archived change that matches no unit is an error.

Version source adapters are json-package@1 for a top-level JSON version and cargo-workspace@1 for [workspace.package] version in Cargo TOML. Release commands do not inspect or update an unconfigured version file.

A baseline manifest anchors an existing version without reconstructing unknown history. Later versions are computed from archived OpenSpec release artifacts. Internal artifacts stay in manifests and SemVer planning but are omitted from the public changelog. In composed projects, each parent manifest pins exact direct-dependency versions. A child release never bumps its parent automatically.

The editor contract is arcantry-config-v1.tosd. Runtime validation also enforces SemVer compatibility, graph cycles, authority overlap, path privacy, and changelog dependencies.