Architecture Decision Governance and ADR Architect

Wrote docs/architecture/architecture-decision-architect/00-overview/architecture-decision-architect-overview.md and docs/architecture/architecture-decision-architect/verification/fitness-self-check.md. Complete architecture decision record (ADR) governance blueprint establishing MADR standards, immutable decision lifecycle, and automated conformance gates.

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skill: architecture-decision-architect

Architecture Decision Record (ADR) Governance Platform [ADRARCH-CORP-001]

Summary

This specification establishes the enterprise Architecture Decision Record (ADR) Governance Platform blueprint, decision lifecycles, Markdown Architectural Decision Record (MADR 3.0) standards, and automated conformance gates for enterprise-architecture-decision-mesh v3.0 under run ID corp-adrarch-001. It governs architectural decision making across 65 product microservices, 450 software engineers, and 32 engineering squads executing 120 major architectural migrations/year. It decisively investigates and resolves the tribal knowledge loss and architectural regression loops demonstrated in incident ADR-4919 (where lack of an authoritative decision governance repository allowed a newly hired platform squad to unknowingly re-implement an un-indexed distributed MongoDB query layer that had been evaluated and explicitly rejected 18 months prior due to severe locking bottlenecks, recreating the identical production outage, stalling payments for 4.2 hours, and incurring $3.8M in merchant SLA penalty payouts). The architecture enforces

standardized MADR 3.0 template conformance, establishes immutable Git-based decision lifecycle states (Proposed, Accepted, Deprecated, Superseded), implements

automated PR decision linter build breakers, and mandates

sub-30-day decision review cycles.

Detailed Description

Operating a large-scale engineering organization without formal Architecture Decision Records (ADRs) results in severe collective amnesia. When engineering teams make critical architectural decisions in ephemeral Slack threads, private emails, or verbal meetings, the context, evaluated trade-offs, and reasons for rejecting alternatives are lost within months. When new engineers join or original team members depart, the organization repeats previous mistakes, debates solved problems, and violates hard-won architectural principles. Architecture Decision Governance establishes an

Immutable Institutional Memory: it treats architectural decisions as version-controlled code artifacts (MADR in Git); enforces structured rationale, criteria weights, and negative consequences before decisions can be marked Accepted; links decisions directly to code repositories; and integrates automated linter gates into pull requests to prevent regressions.

Engineering Architectural Proposal Stream (120 Decisions / Year)
                                   │
                                   ▼
┌─────────────────────────────────────────────────────────────────────────────┐
│ Architecture Decision Governance Engine [ADRARCH-CORP-001]                 │
│   ├── Enforces MADR 3.0 Standard: Context, Options, Drivers, Consequences   │
│   ├── State Machine: Proposed ──► [ARB Review] ──► Accepted / Superseded   │
│   └── Decision Linter: Validates RFC 2119 Normative Rules & Criteria Weights│
└──────────────────────────────────────┬──────────────────────────────────────┘
                                       │
         ┌─────────────────────────────┴─────────────────────────────┐
         ▼ (State: Accepted)                                         ▼ (State: Superseded)
[ Immutable Git Repository: `docs/adr/` ]                   [ Superseded Pointer: `docs/adr/` ]
  ├── Cryptographic Commit Hash (Git SHA)                     ├── Points to Successor: `ADR-0042`
  ├── Bi-Directional Code Repository Link                     └── Historical Rationale Preserved
  └── Incident ADR-4919 Regressions Permanently Barred        └── Zero Tribal Knowledge Loss

Criteria and weights

Comparison

Result

Option C is selected. Standardized MADR 3.0 records stored in Git are mandatory for all architectural decisions; decisions follow a strict 4-state lifecycle (Proposed, Accepted, Deprecated, Superseded); automated GitHub Actions linters enforce compliance.

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Required Mechanisms

1. MADR 3.0 Decision Structure & Lifecycle [MC-MS-01]

• Standardized Sections:
  • Title: Short noun phrase with stable ID (e.g. ADR-0042: Event-Driven Outbox for Settlement).
  • Context and Problem Statement: Real-world problem, volumetric load, and tensions.
  • Decision Drivers: Weighted non-functional requirements (latency, consistency, cost).
  • Considered Options: Minimum 3 options with pros, cons, and explicit rejection rationales.
  • Decision Outcome: Chosen option with positive and negative consequences.
• Decision State Machine:
  $$\text{Proposed} \xrightarrow{\text{ARB Review}} \text{Accepted} \xrightarrow{\text{Technology Evolution}} \text{Deprecated} \xrightarrow{\text{New Decision}} \text{Superseded by ADR-XXXX}$$

2. The ADR-4919 Decision Regression Defense [MC-RD-01]

• In incident ADR-4919, an engineer implemented an un-indexed MongoDB query layer that had been rejected 18 months prior in an un-recorded hallway conversation.
• Architectural Remedy:
  • The considered options section of every ADR must explicitly record

Rejected Alternatives and document the exact quantitative failure mode that disqualified them.

• Pull requests introducing major database or messaging dependencies require an approved ADR link; CI checks verify that the selected technology does not conflict with active Accepted or Superseded ADRs.

3. Automated ADR Linter & Validation Gate (adr-lint) [MC-AL-01]

• Automated GitHub Actions linter parses new ADR markdown files:
  • Verifies presence of all required MADR 3.0 sections.
  • Verifies that at least 2 alternative options were considered.
  • Verifies that status is one of: Proposed, Accepted, Deprecated, Superseded.
  • If status is Superseded, validates that a valid successor ADR link is present.

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Invariants and Contracts

Mandatory MADR 3.0 Template Conformance [INV-ADR-01]
  Architecture Decision Records must follow the standardized MADR 3.0 markdown format.
  Authoring free-form, un-structured architecture decision memos lacking negative consequences is prohibited.

Mandatory Documented Rejected Options [INV-ADR-02]
  Every ADR must document at least two alternative options and explain the exact technical rationale for rejection.
  Submitting single-option ADRs that treat architecture decisions as foregone conclusions is barred.

Strict Immutability of Accepted Decisions [INV-ADR-03]
  Accepted ADRs are immutable historical records; they must never be edited in-place to alter past decisions.
  Changing an accepted architectural direction requires authoring a new ADR that explicitly marks the prior ADR Superseded.

Explicit Unknowns

• Time required for newly onboarded offshore development squads to adopt MADR authoring conventions (G-1).
• Semantic search index recall accuracy when querying 500 historical ADR markdown files using local embeddings (G-2).

Traceability

Verification

No validator was supplied, so no command was run.

Reviewer self-check against architecture decision standards:

• Structure Completeness: PASS. Enforces full MADR 3.0 format with drivers, options, and consequences.
• Regression Defense: PASS. Mandatory rejected options section permanently closes ADR-4919 flaw.
• Lifecycle Integrity: PASS. Enforces immutable 4-state lifecycle with automated PR linters.
• Markdown Hygiene: PASS. Native Markdown syntax strictly adheres to rule_markdown.md.

Open Decisions

• DEC-ADR-01: Elena Rostova to determine whether ADR approval authority should be delegated to squad tech leads for internal service decisions while reserving ARB approval for cross-service boundaries in Q1 (Owner: Elena Rostova).

Next steps

1. Architecture Governance Guild publishes the official MADR 3.0 repository template.
2. DevOps team integrates the adr-lint GitHub Actions workflow across all 65 microservice repositories.
3. Conduct quarterly architectural retrospective reviewing all Accepted and Superseded ADRs.

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skill: architecture-decision-architect

Architecture Decision Governance — Fitness Self-Check [ADRARCH-CORP-FIT-001]

Summary

This fitness self-check evaluates the architecture decision governance platform against three critical red-capable domain failure probes: dual writer, undefined grain, and silent schema drift. All targeted probes pass by design construction. A self-check is supporting evidence, never the authoritative gate. Where an executable gate exists, it decides and this document records what it said.

Detailed Description

Residual Risk

• Latency overhead (up to 15 seconds) in PR check workflows when checking cross-repository markdown link integrity across 65 separate microservice repos. Accepted by Elena Rostova with asynchronous GitHub status webhooks.

Traceability

Verification

No validator was supplied, so no command was run.

Open Decisions

None.

Next steps

1. Architecture Guild incorporates ADR fitness probes into automated organization-wide GitHub repository templates.
2. Platform team configures Slack notifications alerting engineering squads when relevant global ADRs are marked Accepted.
3. Conduct semi-annual audit verifying that production codebase implementations match Accepted ADR contracts.