maister.yaml lives at the registered repository root. Schema version 2 binds the project to its default branch, promotion mode, Flow packages, runners, and capabilities.

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Minimal manifest

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Flow binding

version is a tag pin. Installation records the resolved commit, and an active Run stays on that revision even if the upstream tag later changes.

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Package binding

One packages[] entry attaches every Flow and capability bundle a package ships, pinned to one per-package tag of the form <name>/vX.Y.Z. path is the package directory inside a multi-package repository. MAIster writes this entry when a package is attached, upgraded, or rolled back in the UI, and installs and attaches the listed versions when a repository is registered. See Package sources and versions.

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Promotion

Use local_merge when MAIster should land changes into a local target branch. Use pull_request with a configured remote when the host can push and authenticate to the provider.

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Capabilities and secrets

Project capabilities may bind skills, MCP servers, tools, settings, agent definitions, and environment profiles to compatible agent families. Put only secret references such as env:PROVIDER_TOKEN in configuration. Secret values belong in the appropriate host process environment.

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Validation behavior

Unknown schema versions, duplicate Flow identifiers, empty sources or versions, and unresolved runner references fail configuration validation. MAIster reports the error and does not guess a replacement.