diff --git a/README.md b/README.md
index 8204dac5..371ef256 100644
--- a/README.md
+++ b/README.md
@@ -242,6 +242,7 @@ By adding selected `.mdc` files to `.cursor/rules/`, you can use these rules dir
 - [Alpha Skills](https://github.com/PatrickJS/awesome-cursorrules/blob/main/rules/alpha-skills-quant-factor-research.mdc) - Quantitative factor research skills for Cursor. Evaluate factors, run backtests, mine new alpha through natural language.
 - [Anti-Over-Engineering](https://github.com/PatrickJS/awesome-cursorrules/blob/main/rules/anti-overengineering.mdc) - Keeping changes scoped, simple, and directly tied to the user's request.
 - [Anti-Sycophancy Code Discipline](https://github.com/PatrickJS/awesome-cursorrules/blob/main/rules/anti-sycophancy-code-discipline-cursorrules-prompt-file.mdc) - 17 directives blocking the most common LLM coding honesty failures: hallucinated APIs, invented signatures, false-confidence validation, manufactured-urgency capitulation, authority-driven softening, and self-referential comments. Drop the `.mdc` in `.cursor/rules/`.
+- [Architectural Decision Governance](https://github.com/PatrickJS/awesome-cursorrules/blob/main/rules/architectural-decision-governance.mdc) - Treats recorded architectural decisions as binding constraints, with rules for preventing contradictory implementations, parallel rebuilds, and reintroduced dependencies.
 - [Chrome Extension (JavaScript/TypeScript)](https://github.com/PatrickJS/awesome-cursorrules/blob/main/rules/chrome-extension-dev-js-typescript-cursorrules-pro.mdc) - Chrome extension development with JavaScript and TypeScript integration.
 - [Code Guidelines](https://github.com/PatrickJS/awesome-cursorrules/blob/main/rules/code-guidelines-cursorrules-prompt-file.mdc) - Code development with guidelines integration.
 - [Code Pair Interviews](https://github.com/PatrickJS/awesome-cursorrules/blob/main/rules/code-pair-interviews.mdc) - Interview practice and collaborative coding sessions.
diff --git a/rules/architectural-decision-governance.mdc b/rules/architectural-decision-governance.mdc
new file mode 100644
index 00000000..c59cc0e1
--- /dev/null
+++ b/rules/architectural-decision-governance.mdc
@@ -0,0 +1,44 @@
+---
+description: Enforce recorded architectural decisions (ADRs) so AI-generated code does not contradict prior choices. Prevents architectural drift, silent rebuilds, and reintroduced dependencies.
+globs: ["**/*"]
+alwaysApply: false
+---
+
+# Architectural Decision Governance
+
+This codebase records architectural decisions. Treat them as binding
+constraints, not suggestions. Check generated code against them before you write.
+
+## Rules
+
+1. Respect recorded decisions. If the project documents a decision (in
+   `docs/adr/`, `ADR.md`, `DECISIONS.md`, `.cursor/rules/`, or an
+   `ARCHITECTURE`/`CONTEXT` file), follow it. Do not generate code that
+   contradicts one.
+2. Extend, do not rebuild. If an abstraction already exists for a purpose,
+   reuse or extend it. Do not stand up a parallel implementation.
+3. Do not reintroduce rejected choices. If a dependency, pattern, or approach
+   was explicitly ruled out, leave it out. If you think it is now warranted,
+   say so and ask first.
+4. Stay inside the chosen stack. Do not add a new library, datastore, or
+   pattern when an approved one already covers the need.
+5. Surface conflicts early. If a request collides with a recorded decision,
+   stop and name the decision it violates instead of silently generating the
+   conflicting code.
+
+## Before you write code
+
+1. Identify which recorded decisions apply to the files you are touching.
+2. State, in one line, the decision(s) you are working under.
+3. Generate code consistent with them.
+4. If the choice is architecturally significant and no decision covers it
+   (a new dependency, a new boundary, a data-model change), propose the
+   decision and ask before committing to it.
+
+## When you cannot comply
+
+Do not proceed. Explain which decision blocks the request, what the request
+would require, and the options: comply, amend the decision, or escalate.
+
+---
+Source: [Mneme HQ](https://mnemehq.com/) architectural governance ruleset.