ce9e8718df
Each flowchart node now links to the specific guide section it represents via Mermaid `click NodeId href "URL"` directives. sequenceDiagram blocks (10 total) are skipped as Mermaid does not support click directives for them. Files updated: - 01-foundations.md through 10-adoption-and-learning.md - All flowchart nodes linked to their respective guide anchors - Architecture, MCP, security, workflows, multi-agent, cost, adoption sections Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
255 lines
12 KiB
Markdown
255 lines
12 KiB
Markdown
---
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title: "Claude Code — Configuration System Diagrams"
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description: "Config precedence, skills vs commands vs agents, agent lifecycle, hooks pipeline"
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tags: [configuration, hooks, agents, skills, commands]
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---
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# Configuration System
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How Claude Code loads settings, resolves conflicts, and orchestrates extensibility.
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---
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### Configuration Precedence (5 Levels)
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Claude Code resolves settings through a strict priority hierarchy. Higher layers override lower ones. Knowing this prevents "why isn't my config working?" bugs.
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```mermaid
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flowchart TD
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A["1️⃣ CLI Flags<br/>--model, --dangerously-skip-permissions<br/>--max-turns, --system-prompt"] --> B["2️⃣ Environment Variables<br/>ANTHROPIC_API_KEY<br/>CLAUDE_MODEL, CLAUDE_CONFIG"]
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B --> C["3️⃣ Project Config<br/>.claude/settings.json<br/>.claude/settings.local.json"]
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C --> D["4️⃣ Global Config<br/>~/.claude/settings.json<br/>~/.claude/CLAUDE.md"]
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D --> E["5️⃣ Built-in Defaults<br/>Hardcoded in Claude Code binary"]
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A1["Highest priority<br/>Overrides everything<br/>Use: automation, CI/CD"] --> A
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E1["Lowest priority<br/>Fallback values<br/>Use: baseline behavior"] --> E
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style A fill:#E87E2F,color:#fff
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style B fill:#6DB3F2,color:#fff
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style C fill:#6DB3F2,color:#fff
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style D fill:#F5E6D3,color:#333
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style E fill:#B8B8B8,color:#333
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style A1 fill:#B8B8B8,color:#333
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style E1 fill:#B8B8B8,color:#333
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click A href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#34-precedence-rules" "CLI Flags — highest priority"
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click B href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#33-settings--permissions" "Environment Variables"
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click C href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#33-settings--permissions" "Project Config"
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click D href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#31-memory-files-claudemd" "Global Config"
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click E href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#34-precedence-rules" "Built-in Defaults"
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click A1 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#34-precedence-rules" "Highest priority"
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click E1 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#34-precedence-rules" "Lowest priority"
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```
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<details>
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<summary>ASCII version</summary>
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```
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PRIORITY (highest to lowest)
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═══════════════════════════
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1. CLI Flags ← --model, --system-prompt
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2. Environment Vars ← ANTHROPIC_API_KEY
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3. Project .claude/ ← settings.json, settings.local.json
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4. Global ~/.claude/ ← settings.json, CLAUDE.md
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5. Built-in defaults ← hardcoded fallbacks
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```
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</details>
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> **Source**: [Configuration System](../ultimate-guide.md#configuration) — Line ~3760
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---
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### Skills vs. Commands vs. Agents — When to Use Each
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Three extensibility mechanisms with different purposes and tradeoffs. Choosing the wrong abstraction leads to over-engineering or under-powered automation.
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```mermaid
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flowchart LR
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subgraph SKILLS["📦 Skills (.claude/skills/)"]
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S1[Bundled capability<br/>with resources]
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S2[Invoked via /skillname]
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S3[Portable across projects]
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S4["Use for: reusable<br/>cross-project capabilities"]
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end
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subgraph COMMANDS["⚡ Commands (.claude/commands/)"]
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C1[Simple template<br/>or script]
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C2[Project slash command]
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C3[Project-specific only]
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C4["Use for: project<br/>automation, shortcuts"]
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end
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subgraph AGENTS["🤖 Agents (.claude/agents/)"]
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A1[Full autonomous agent]
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A2[Own tool set & CLAUDE.md]
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A3[Spawned via Task tool]
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A4["Use for: complex<br/>delegated tasks"]
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end
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Q{What are<br/>you building?} --> |Reusable feature| SKILLS
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Q --> |Project shortcut| COMMANDS
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Q --> |Complex sub-task| AGENTS
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style S1 fill:#6DB3F2,color:#fff
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style S4 fill:#7BC47F,color:#333
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style C1 fill:#F5E6D3,color:#333
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style C4 fill:#7BC47F,color:#333
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style A1 fill:#E87E2F,color:#fff
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style A4 fill:#7BC47F,color:#333
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style Q fill:#E87E2F,color:#fff
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click S1 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#51-understanding-skills" "Skills: Bundled capability"
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click S2 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#51-understanding-skills" "Skills: Invoked via /skillname"
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click S3 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#51-understanding-skills" "Skills: Portable across projects"
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click S4 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#51-understanding-skills" "Skills: Reusable capabilities"
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click C1 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#62-creating-custom-commands" "Commands: Simple template"
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click C2 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#62-creating-custom-commands" "Commands: Project slash command"
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click C3 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#62-creating-custom-commands" "Commands: Project-specific"
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click C4 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#62-creating-custom-commands" "Commands: Project automation"
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click A1 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#41-what-are-agents" "Agents: Full autonomous"
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click A2 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#41-what-are-agents" "Agents: Own tool set"
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click A3 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#41-what-are-agents" "Agents: Spawned via Task tool"
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click A4 href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#41-what-are-agents" "Agents: Complex delegated tasks"
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click Q href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#41-what-are-agents" "What are you building?"
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```
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<details>
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<summary>ASCII version</summary>
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```
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Skills Commands Agents
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Location: .claude/skills/ .claude/commands/ .claude/agents/
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Trigger: /skillname /commandname Task tool
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Scope: Cross-project This project Any context
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Complexity: Medium (bundled) Low (template) High (autonomous)
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Use when: Reusable caps Quick shortcuts Complex tasks
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```
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</details>
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> **Source**: [Extensibility System](../ultimate-guide.md#extensibility) — Line ~4495, ~5025, ~3900
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---
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### Agent Lifecycle & Scope Isolation
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Sub-agents run in complete isolation from the parent. They receive a copy of context but share no state. Understanding this prevents "why can't my sub-agent see X?" confusion.
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```mermaid
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sequenceDiagram
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participant P as Parent Claude
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participant T as Task Tool
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participant S as Sub-Agent
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participant FS as File System
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P->>T: Task(prompt, tools_allowed)
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T->>S: Spawn new Claude instance
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Note over S: Gets: prompt + tool grants<br/>Does NOT get: parent conversation
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S->>FS: Read files (if granted)
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S->>FS: Edit files (if granted)
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S->>S: Independent reasoning
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Note over S,FS: Fully isolated execution
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Note over S: No access to parent state
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S->>T: Return: text result only
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T->>P: Result string
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P->>P: Continues with result
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Note over P,T: Parent sees only final text<br/>No side-effects leaked back
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```
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<details>
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<summary>ASCII version</summary>
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```
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Parent ──Task(prompt, tools)──► Sub-Agent
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│
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[isolated exec]
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- read files
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- edit files
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- bash (if allowed)
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│
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Parent ◄───── text result ──────────┘
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(no state sharing, no side effects back)
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```
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</details>
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> **Source**: [Sub-Agents](../ultimate-guide.md#sub-agents) — Line ~3900
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---
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### Hooks Event Pipeline
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Hooks let you run custom code at key points in Claude Code's lifecycle — for security scanning, logging, enforcement, or notifications. The execution order matters.
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```mermaid
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flowchart TD
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A([User sends message]) --> B{PreToolUse Hook}
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B -->|Exit 0: allow| C[Tool executes]
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B -->|Exit 1: block| D([Tool blocked<br/>Clause stops])
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C --> E{PostToolUse Hook}
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E --> F[Next tool or response]
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F --> G{More tool calls?}
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G -->|Yes| B
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G -->|No| H([Session ends])
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H --> I{Stop Hook}
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I --> J([Complete])
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K{PreCompact Hook} -.->|Before /compact| L[/compact runs]
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L --> M{PostCompact Hook}
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style B fill:#E87E2F,color:#fff
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style D fill:#E85D5D,color:#fff
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style E fill:#E87E2F,color:#fff
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style I fill:#E87E2F,color:#fff
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style K fill:#6DB3F2,color:#fff
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style M fill:#6DB3F2,color:#fff
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style C fill:#7BC47F,color:#333
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style J fill:#7BC47F,color:#333
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click A href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "User sends message"
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click B href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "PreToolUse Hook"
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click C href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/architecture.md#2-the-tool-arsenal" "Tool executes"
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click D href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "Tool blocked"
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click E href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "PostToolUse Hook"
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click F href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "Next tool or response"
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click G href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "More tool calls?"
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click H href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "Session ends"
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click I href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "Stop Hook"
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click J href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#72-creating-hooks" "Complete"
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click K href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "PreCompact Hook"
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click L href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "/compact runs"
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click M href "https://github.com/FlorianBruniaux/claude-code-ultimate-guide/blob/main/guide/ultimate-guide.md#71-the-event-system" "PostCompact Hook"
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```
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<details>
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<summary>ASCII version</summary>
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```
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User message
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│
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PreToolUse ──exit 1──► BLOCKED
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│ exit 0
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▼
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Tool executes
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│
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PostToolUse
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│
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More tools? ──yes──► PreToolUse (loop)
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│ no
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Session ends
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│
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Stop Hook
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│
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Complete
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Separately: PreCompact ──► /compact ──► PostCompact
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```
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</details>
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> **Source**: [Hooks System](../ultimate-guide.md#hooks) — Line ~5350
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