OAB — Open Architecture Brain, first release
Architecture intelligence for AI coding agents. Capacity planning, proportional system design, architecture review, and ADRs with measurable revisit triggers — 100% open source, Apache-2.0, local-first, vendor-neutral.
/plugin marketplace add mhayk/oab
/plugin install oab@oab
Planned as v0.1.0. The version counter was consumed by live-run iterations (0.1.0 → 0.1.7), each bump required to reach the installed plugin — the per-version cache freeze is documented in
docs/maintainers/release.md. The milestone ships under the number it reached.
What's in it
| Knowledge units, six domains — every one with a quantified when it does not apply | 37 |
| Client-agnostic reasoning frameworks with blocking gates | 6 |
| Deterministic capacity calculators, stdlib-only, tested | 8 |
| JSON Schema contracts, fixtures validating in both directions | 9 / 33 |
| Evaluation scenarios — over- and under-engineering guards, magnitude-perturbed | 5/5 passing |
Plus the complexity budget (4 + 1.5 × (engineers − 2) + 4 × ops), the oab-principles background skill, a repo-scanner subagent, and a PostToolUse hook that validates every OAB artifact the moment it is written.
Verified with live, unedited evidence
examples/live-run/— a real/oab:designrun passing every scenario assertion. Six earlier runs without an executing hook failed the same assertion; the mechanism closed what instructions could not.examples/live-review/— a real review of linkding, chosen because it is the trap: small, correct, SQLite by default. Zero scale-inappropriate findings, all 8 evidence citations verified against the code, and one genuine upstream-worthy bug found (unboundedrequests.getin the favicon and preview loaders).- Install: fresh clone 0.8 s / 8.1 MB, against ADR-0003 thresholds of 5 s / 50 MB.
Known caveat
Hooks from marketplace-installed plugins did not execute in headless sessions, while the identical hook via --plugin-dir did (#45). Skill-level validation instructions are the fallback layer until that is resolved.
What is deliberately not here
No MCP server, no knowledge graph, no second integration, no hosted anything, no telemetry — see §32 Overengineering Review, a critique of this project's own founding brief.
Full changelog: CHANGELOG.md