AsDecided MCP server

AsDecided

Engineering decisions your agents can follow. Build, as decided.

AsDecided keeps requirements, decisions, designs, roadmaps, and prompts as typed Markdown in your repository. Its native Rust engine validates that knowledge, retrieves relevant decisions deterministically, and serves it read-only to agents over MCP.

No embeddings, model call, hosted index, or Python runtime is required. The same repository state produces the same answer.

Product site · Documentation · Canonical sources · Changelog

Install

Install the native engine and MCP server through Homebrew:

brew install asdecided/tap/asdecided-core

Rust users can install the decided CLI directly from crates.io:

cargo install decided
cargo install decided-mcp

cargo install compiles from source. To install the prebuilt release binaries instead, use cargo binstall. Crates published after v0.31.0 point it at the GitHub release archives:

cargo binstall decided decided-mcp

Windows users can install both native executables through Scoop:

scoop bucket add asdecided https://github.com/asdecided/scoop-bucket
scoop install asdecided

Native decided and decided-mcp archives are also published on GitHub Releases. The Linux archives (x86_64 and aarch64) need glibc 2.17 or newer, so they run on RHEL/CentOS 7 and later, Amazon Linux 2 and 2023, and current Debian and Ubuntu releases.

Python API consumers should use the asdecided/sdk client SDK. It talks to the native engine; this repository does not ship a second Python engine or a PyPI package.

Start a repository

decided quickstart
decided validate decisions/
decided gate decisions/
decided gate decisions/ --code --base origin/main

New repositories use:

.decided/config.yaml
decisions/

Existing artifact IDs such as RAC-ABC123DEF456 are durable identities and do not change with the product name.

Federate corpora

Manifest version 2 composes several pinned, materialised parent corpora into one source-aware DAG while preserving every source, diamond route, override, and read-only boundary:

decided corpus status decisions/
decided corpus explain organization/standards::ADR-01K000000001 decisions/

Federation is fully offline and forge-neutral: the engine consumes verified working-tree bytes, not GitHub APIs or a hosted index. See the federation guide and runnable multi-parent example.

Migrate an existing repository

Migration is explicit and never runs during an ordinary command:

decided migrate layout . --dry-run
decided migrate layout .

The migration moves .rac/ to .decided/ and rac/ to decisions/. It refuses to overwrite either destination.

MCP

The official MCP Registry identity is io.github.asdecided/core. Its Registry package is the versioned local MCP image under ghcr.io/asdecided/core; Homebrew and Cargo remain direct native installation paths for the same Rust server.

The OCI server still needs an explicit repository grant:

docker run --rm -i -v "$PWD:/work:ro" \
  ghcr.io/asdecided/core:mcp-latest --root /work

{
  "mcpServers": {
    "asdecided": {
      "command": "decided-mcp",
      "args": ["--root", "."]
    }
  }
}

Architecture

Rust is the product engine and the only CLI/MCP runtime in this repository. The authoritative language-neutral compatibility fixtures live in asdecided-spec. Live-corpus validation is based on validity, determinism, freshness, and cache/no-cache equality.

Document ingestion remains an ancillary Python connector rather than part of the core engine. The retired Python engine is preserved for historical review at the immutable python-engine-final tag; it is not maintained or run in normal CI.

License

Apache-2.0. See LICENSE and NOTICE.

Governance and continuity

AsDecided core is solo-maintained and supported on a best-effort basis. The project does not depend on a hosted service: adopters keep their Markdown corpus in their own git repository, while the Apache-2.0 implementation and language-neutral specification remain public. See GOVERNANCE.md for the maintainer, release, support, and continuity posture.