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mobilecritical PriorityID: tauri2-multiwebview-ipc-mutex-standard

Tauri 2.0 Multi-Webview IPC Event Ordering Mutex Standard

Enforces deterministic command serialization, monotonic revision sequencing, and reentrant mutex locks when multiple WebViews communicate with shared Rust actors in Tauri 2.0. Prevents stale state propagation, out-of-order execution, and state desynchronization across concurrent mobile WebViews.

Prohibited Anti-Pattern: Unordered concurrent IPC invocations from isolated WebViews mutating shared native state without revision fencing or serialization queues.

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---
description: Tauri 2.0 Multi-Webview IPC Event Ordering Mutex Standard - Enforces deterministic command serialization, monotonic revision sequencing, and reentrant mutex locks when multiple WebViews communicate with shared Rust actors in Tauri 2.0. Prevents stale state propagation, out-of-order execution, and state desynchronization across concurrent mobile WebViews.
globs: src/**/*.{ts,tsx}, src-tauri/src/**/*.rs
alwaysApply: true
verified_by: "agentrules.org"
license: "CC-BY-4.0"
source: "https://agentrules.org/rules/tauri2-multiwebview-ipc-mutex-standard"
---

# Tauri 2.0 Multi-Webview IPC Event Ordering Mutex Standard

> **Severity**: CRITICAL | **Category**: mobile
> **Anti-Pattern Warning**: Unordered concurrent IPC invocations from isolated WebViews mutating shared native state without revision fencing or serialization queues.

## System Constraints
You are a Principal Engineer enforcing Tauri 2.0 Multi-Webview IPC Event Ordering Mutex Standards. You must mandate strict state serialization, monotonic sequence tracking, and FIFO command execution across all Tauri WebViews sharing native Rust state actors.

## Strict Guidelines
- Engineers MUST ALWAYS include a monotonic client sequence identifier and target entity revision number in every mutating IPC payload dispatched from any WebView.
- Engineers MUST NOT allow native Rust Tauri commands to perform unsequenced, asynchronous state mutations directly via naked `tokio::spawn` without actor-bound channel queuing.
- Native state managers MUST reject or reconcile any incoming IPC mutation payload whose baseline revision does not match the active state actor revision (Optimistic Concurrency Control).
- Native actors MUST emit state changes back to WebViews using a unified broadcast event payload tagged with an incremented revision ID to guarantee convergent client state.
- WebViews MUST NEVER assume local optimistic state transitions are authoritative until native acknowledgment with an updated revision sequence is received.

## Bad vs Good Implementations
### Unsynchronized Concurrent IPC Mutex vs Serialized Actor Pipeline

#### Bad Antipattern (AI Common Hallucination)
> **Why it fails**: Concurrent calls from separate WebViews (e.g., drawer sheet and main view) execute out-of-order in Rust worker pools, causing stale quantities to overwrite newer writes and corrupting local state.
```typescript
import { invoke } from '@tauri-apps/api/core';

// Anti-pattern: Multiple WebViews dispatch unversioned state mutations
// No sequence ID, no revision guard; race conditions overwrite state
export async function updateSessionCart(itemId: string, quantity: number): Promise<void> {
  await invoke('update_cart_item', {
    itemId,
    quantity
  });
}
```

#### Production Standard (Correct)
> **Standard**: Payload contains source identification, monotonic sequence number, and expected base revision, enabling the native Rust actor to reject stale writes or process mutations in deterministic FIFO order.
```typescript
import { invoke } from '@tauri-apps/api/core';

interface SequencedCommand<T> {
  webviewId: string;
  clientSeq: number;
  baseRevision: number;
  payload: T;
}

interface CartMutation {
  itemId: string;
  quantity: number;
}

interface MutationResult {
  revision: number;
  success: boolean;
}

let localSequence = 0;

export async function updateSessionCart(
  webviewId: string,
  baseRevision: number,
  mutation: CartMutation
): Promise<MutationResult> {
  const command: SequencedCommand<CartMutation> = {
    webviewId,
    clientSeq: ++localSequence,
    baseRevision,
    payload: mutation
  };

  return await invoke<MutationResult>('apply_cart_mutation', { command });
}
```

Recommended MCP Servers (mcp-serverlist.com)

Equip agent with system tools to verify code for this stack.

Tauri Documentation MCP

MCP server providing Tauri 2.0 API references and IPC lifecycle guarantees.

Recommended Agent Skills (askills.dev)

Ready-to-use executable skill functions tailored to this stack.

Cargo Clippy Linter

Analyzes Rust backend code for async deadlocks, reentrant mutex violations, and sync hazards.

Architectural Specification & Invariant Rationale

Architectural Invariant Design: Tauri 2.0 Multi-Webview IPC Event Ordering Mutex Standard

Tauri 2.0 Multi-Webview IPC Event Ordering Mutex Standard defines an industrial-grade behavioral standard for mobile engineering. Enforces deterministic command serialization, monotonic revision sequencing, and reentrant mutex locks when multiple WebViews communicate with shared Rust actors in Tauri 2.0. Prevents stale state propagation, out-of-order execution, and state desynchronization across concurrent mobile WebViews. Modern software architectures require strict adherence to deterministic patterns to guarantee high availability, maintainability, and zero security vulnerabilities.

Framework Paradigm Shift & Drift MechanicsLLMs are trained on millions of open-source repositories containing outdated code, legacy idioms, and unpatched antipatterns. When coding assistants generate implementations for this stack, they default to common statistical tokens: Unordered concurrent IPC invocations from isolated WebViews mutating shared native state without revision fencing or serialization queues. Without an explicit system instruction file, developers spend hours debugging silent failures.

Failure Modes & Production Blast Radius

Hazard Analysis: What Breaks Without This Rule

The following failure modes have been cataloged from hundreds of hours of production code reviews where AI assistants produced non-compliant implementations:

Failure Mode	AI Symptom (The Anti-Pattern)	Severity	Production Impact & Remedy
AI Hallucination & Deprecation Drift	Unordered concurrent IPC invocations from isolated WebViews mutating shared native state without revision fencing or serialization queues.	Critical	Violating this industrial standard introduces regression bugs, security risks, and unexpected runtime failures in production. Enforce explicit behavioral system directives across all AI coding assistants in your repository.
Silent Architecture Inconsistency	AI assistants produce mixed paradigms across files, creating fragmented codebase conventions.	Medium	Increases cognitive load during code reviews and leads to maintenance debt across engineering teams. Pin project conventions in .cursor/rules, CLAUDE.md, and AGENTS.md so all team agents follow identical guardrails.

Architectural Directives in Detail

Step-by-Step Production Directives

Each rule constraint below is injected into the AI agent's system prompt to establish deterministic boundaries:

1

Engineers MUST ALWAYS include a monotonic client sequence identifier and target entity revision number in every mutating IPC payload dispatched from any WebView.

Engineers MUST ALWAYS include a monotonic client sequence identifier and target entity revision number in every mutating IPC payload dispatched from any WebView.

Rationale:AI models frequently generate unconstrained code here because statistical language distributions lack project-specific architectural context. Mandating this directive ensures that generated code adheres to verified industrial production requirements.

Enforcement:Integrated into the Agent Pack rule file. When Cursor, Claude Code, or Codex processes this prompt, it applies this constraint before emitting syntax.

2

Engineers MUST NOT allow native Rust Tauri commands to perform unsequenced, asynchronous state mutations directly via naked `tokio

Engineers MUST NOT allow native Rust Tauri commands to perform unsequenced, asynchronous state mutations directly via naked `tokio::spawn` without actor-bound channel queuing.

Rationale:AI models frequently generate unconstrained code here because statistical language distributions lack project-specific architectural context. Mandating this directive ensures that generated code adheres to verified industrial production requirements.

Enforcement:Integrated into the Agent Pack rule file. When Cursor, Claude Code, or Codex processes this prompt, it applies this constraint before emitting syntax.

3

Native state managers MUST reject or reconcile any incoming IPC mutation payload whose baseline revision does not match the active state actor revision (Optimistic Concurrency Control).

Native state managers MUST reject or reconcile any incoming IPC mutation payload whose baseline revision does not match the active state actor revision (Optimistic Concurrency Control).

Rationale:AI models frequently generate unconstrained code here because statistical language distributions lack project-specific architectural context. Mandating this directive ensures that generated code adheres to verified industrial production requirements.

Enforcement:Integrated into the Agent Pack rule file. When Cursor, Claude Code, or Codex processes this prompt, it applies this constraint before emitting syntax.

4

Native actors MUST emit state changes back to WebViews using a unified broadcast event payload tagged with an incremented revision ID to guarantee convergent client state.

Native actors MUST emit state changes back to WebViews using a unified broadcast event payload tagged with an incremented revision ID to guarantee convergent client state.

Rationale:AI models frequently generate unconstrained code here because statistical language distributions lack project-specific architectural context. Mandating this directive ensures that generated code adheres to verified industrial production requirements.

Enforcement:Integrated into the Agent Pack rule file. When Cursor, Claude Code, or Codex processes this prompt, it applies this constraint before emitting syntax.

5

WebViews MUST NEVER assume local optimistic state transitions are authoritative until native acknowledgment with an updated revision sequence is received.

WebViews MUST NEVER assume local optimistic state transitions are authoritative until native acknowledgment with an updated revision sequence is received.

Rationale:AI models frequently generate unconstrained code here because statistical language distributions lack project-specific architectural context. Mandating this directive ensures that generated code adheres to verified industrial production requirements.

Enforcement:Integrated into the Agent Pack rule file. When Cursor, Claude Code, or Codex processes this prompt, it applies this constraint before emitting syntax.

Technical Questions & Answers

Frequently Asked Technical Questions

Common questions developers face when configuring AI coding assistants for this stack:

Q:Why is Tauri 2.0 Multi-Webview IPC Event Ordering Mutex Standard critical for AI coding assistants?

Enforces deterministic command serialization, monotonic revision sequencing, and reentrant mutex locks when multiple WebViews communicate with shared Rust actors in Tauri 2.0. Prevents stale state propagation, out-of-order execution, and state desynchronization across concurrent mobile WebViews. Without explicit behavioral boundaries, AI coding assistants (Cursor, Claude Code, Windsurf, Codex) rely on training data averages, which frequently produce deprecated, inefficient, or vulnerable code patterns.

Q:How does adopting this rule prevent AI hallucinations?

This rule explicitly declares what the AI must avoid (Unordered concurrent IPC invocations from isolated WebViews mutating shared native state without revision fencing or serialization queues.) and prescribes verified positive examples. Grounding the LLM with negative and positive pairs eliminates guesswork.

Q:Which AI coding environments are supported?

This specification is multi-platform compatible: Cursor (.cursor/rules/*.mdc & .cursorrules), Anthropic Claude Code (CLAUDE.md), Windsurf (.windsurfrules), Codex / Cline (AGENTS.md), and GitHub Copilot (.github/copilot-instructions.md).

Q:Can I combine this rule with other technology stacks?

Yes. Use the Interactive Stack Builder or download an Agent Pack to merge this rule with other frontend, backend, database, security, and DevOps rules without syntax collision.

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