agent-native-architecture

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📁 references/
- 📄 action-parity-discipline.md 10.9 KB
- 📄 agent-execution-patterns.md 13.0 KB
- 📄 agent-native-testing.md 16.4 KB
- 📄 anti-patterns.md 4.4 KB
- 📄 architecture-patterns.md 16.8 KB
- 📄 core-principles.md 4.0 KB
- 📄 dynamic-context-injection.md 9.4 KB
- 📄 files-universal-interface.md 9.8 KB
- 📄 from-primitives-to-domain-tools.md 11.5 KB
- 📄 hooks-patterns.md 5.6 KB
- 📄 mcp-tool-design.md 15.3 KB
- 📄 mobile-patterns.md 25.0 KB
- 📄 product-implications.md 12.7 KB
- 📄 quick-start.md 1002 B
- 📄 refactoring-to-prompt-native.md 8.4 KB
- 📄 self-modification.md 7.7 KB
- 📄 shared-workspace-architecture.md 20.4 KB
- 📄 success-criteria.md 1.8 KB
- 📄 system-prompt-design.md 6.4 KB
📄 SKILL.md 7.7 KB

SKILL.md

---
name: agent-native-architecture
description: >-
  Build applications where agents are first-class citizens. Use when designing
  autonomous agents, MCP tools, or self-modifying agent-loop architectures.
---

# Agent-Native Architecture

## Core Principles

Five principles govern agent-native design. For detailed explanations, examples, and test criteria, see [core-principles.md](./references/core-principles.md).

| Principle | One-line test |
|-----------|--------------|
| **Parity** | Can the agent achieve every outcome the UI allows? |
| **Granularity** | To change behavior, do you edit prose or refactor code? |
| **Composability** | Can you add a feature by writing a new prompt, without new code? |
| **Emergent Capability** | Can the agent handle open-ended requests you didn't design for? |
| **Improvement Over Time** | Does the app work better after a month, even without code changes? |

## Focus Area Selection

1. **Design architecture** - Plan a new agent-native system from scratch
2. **Files & workspace** - Use files as the universal interface, shared workspace patterns
3. **Tool design** - Build primitive tools, dynamic capability discovery, CRUD completeness
4. **Domain tools** - Know when to add domain tools vs stay with primitives
5. **Execution patterns** - Completion signals, partial completion, context limits
6. **System prompts** - Define agent behavior in prompts, judgment criteria
7. **Context injection** - Inject runtime app state into agent prompts
8. **Action parity** - Ensure agents can do everything users can do
9. **Self-modification** - Enable agents to safely evolve themselves
10. **Product design** - Progressive disclosure, latent demand, approval patterns
11. **Mobile patterns** - iOS storage, background execution, checkpoint/resume
12. **Testing** - Test agent-native apps for capability and parity
13. **Refactoring** - Make existing code more agent-native
14. **Anti-patterns** - Common mistakes and how to avoid them
15. **Success criteria** - Verify your architecture is agent-native
16. **Hooks patterns** - Hook events, decision control, MCP matchers, async hooks

**Wait for response before proceeding.**

## Reference Routing

| Response | Action |
|----------|--------|
| 1, "design", "architecture", "plan" | Read [architecture-patterns.md](./references/architecture-patterns.md), then apply Architecture Checklist below |
| 2, "files", "workspace", "filesystem" | Read [files-universal-interface.md](./references/files-universal-interface.md) and [shared-workspace-architecture.md](./references/shared-workspace-architecture.md) |
| 3, "tool", "mcp", "primitive", "crud" | Read [mcp-tool-design.md](./references/mcp-tool-design.md) |
| 4, "domain tool", "when to add" | Read [from-primitives-to-domain-tools.md](./references/from-primitives-to-domain-tools.md) |
| 5, "execution", "completion", "loop" | Read [agent-execution-patterns.md](./references/agent-execution-patterns.md) |
| 6, "prompt", "system prompt", "behavior" | Read [system-prompt-design.md](./references/system-prompt-design.md) |
| 7, "context", "inject", "runtime", "dynamic" | Read [dynamic-context-injection.md](./references/dynamic-context-injection.md) |
| 8, "parity", "ui action", "capability map" | Read [action-parity-discipline.md](./references/action-parity-discipline.md) |
| 9, "self-modify", "evolve", "git" | Read [self-modification.md](./references/self-modification.md) |
| 10, "product", "progressive", "approval", "latent demand" | Read [product-implications.md](./references/product-implications.md) |
| 11, "mobile", "ios", "android", "background", "checkpoint" | Read [mobile-patterns.md](./references/mobile-patterns.md) |
| 12, "test", "testing", "verify", "validate" | Read [agent-native-testing.md](./references/agent-native-testing.md) |
| 13, "review", "refactor", "existing" | Read [refactoring-to-prompt-native.md](./references/refactoring-to-prompt-native.md) |
| 14, "anti-pattern", "mistake", "wrong" | Read [anti-patterns.md](./references/anti-patterns.md) |
| 15, "success", "criteria", "verify", "checklist" | Read [success-criteria.md](./references/success-criteria.md) |
| 16, "hook", "hooks", "PreToolUse", "decision control", "async hook" | Read [hooks-patterns.md](./references/hooks-patterns.md) |
| 0, "quick start", "getting started", "overview", "introduction" | Read [quick-start.md](./references/quick-start.md) |

**After reading the reference, apply those patterns to the user's specific context.**

## Architecture Review Checklist

When designing an agent-native system, verify these **before implementation**:

### Core Principles
- [ ] **Parity:** Every UI action has a corresponding agent capability
- [ ] **Granularity:** Tools are primitives; features are prompt-defined outcomes
- [ ] **Composability:** New features can be added via prompts alone
- [ ] **Emergent Capability:** Agent can handle open-ended requests in your domain

### Tool Design
- [ ] **Dynamic vs Static:** For external APIs where agent should have full access, use Dynamic Capability Discovery
- [ ] **CRUD Completeness:** Every entity has create, read, update, AND delete
- [ ] **Primitives over Workflows:** Tools expose atomic capabilities; compose workflows in prompts
- [ ] **API as Validator:** Use `z.string()` inputs when the API validates, not `z.enum()`

### Files & Workspace
- [ ] **Shared Workspace:** Agent and user work in same data space
- [ ] **context.md Pattern:** Agent reads/updates context file for accumulated knowledge
- [ ] **File Organization:** Entity-scoped directories with consistent naming
- [ ] **Context Durability:** Incremental progress writes (WAL pattern) so interrupted tasks resume from last checkpoint

### Agent Execution
- [ ] **Completion Signals:** Agent has explicit `complete_task` tool (not heuristic detection)
- [ ] **Partial Completion:** Multi-step tasks track progress for resume
- [ ] **Context Limits:** Designed for bounded context from the start
- [ ] **Validate-Before-Run:** Agent previews planned actions before executing destructive operations

### Context Injection
- [ ] **Available Resources:** System prompt includes what exists (files, data, types)
- [ ] **Available Capabilities:** System prompt documents tools with user vocabulary
- [ ] **Dynamic Context:** Context refreshes for long sessions (or provide `refresh_context` tool)

### UI Integration
- [ ] **Agent -> UI:** Agent changes reflect in UI (shared service, file watching, or event bus)
- [ ] **No Silent Actions:** Agent writes trigger UI updates immediately
- [ ] **Capability Discovery:** Users can learn what agent can do

### Governance
- [ ] **Approval Gates:** Destructive or irreversible actions require user confirmation
- [ ] **Audit Trail:** Agent actions logged with timestamp, tool, and outcome
- [ ] **Scope Boundaries:** Agent cannot access resources outside its designated workspace

### Hooks & Governance Automation
- [ ] **Event Coverage:** Only 6 hook events fire in agent context (PreToolUse, PostToolUse, PermissionRequest, PostToolUseFailure, Stop/SubagentStop); session lifecycle logic lives in the orchestrator
- [ ] **Decision Gates:** PreToolUse hooks enforce tool-level policy (allow/deny/ask/defer) instead of hardcoded checks
- [ ] **Completion Gating:** SubagentStop hooks block premature completion when verification steps remain
- [ ] **MCP Matchers:** Regex patterns target tools by server and operation for capability-based security
- [ ] **Two-Tier Config:** Shared policy committed, personal overrides git-ignored, per-hook disable toggles

### Mobile (if applicable)
- [ ] **Checkpoint/Resume:** Handle iOS app suspension gracefully
- [ ] **iCloud Storage:** iCloud-first with local fallback for multi-device sync
- [ ] **Cost Awareness:** Model tier selection (Haiku/Sonnet/Opus)

**When designing architecture, explicitly address each checkbox in your plan.**

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