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<!DOCTYPE html>
<!-- build: 2026-06-05 -->
<html lang="en" data-theme="dark">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CCA-F Exam Blueprint | car-e-pool-api</title>
<style>
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<body>
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<div class="mob-bar">
<button class="ham-btn" onclick="toggleSidebar()" aria-label="Open menu">☰</button>
<span class="mob-title">CCA-F STUDY TERMINAL</span>
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<!-- ═══════════════ SIDEBAR ═══════════════ -->
<aside class="sidebar" id="sidebar">
<div class="sb-top">
<div class="sb-title">CCA-F STUDY TERMINAL</div>
<div class="sb-prompt">~/car-e-pool-api/exam $</div>
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<nav class="sb-nav">
<div class="nav-folder">📁 sections/</div>
<div class="nav-item active" onclick="show('overview',this)" data-domain="overview">
<span class="nav-tree">├──</span><span class="nav-star" id="star-overview">[★ 0]</span><span class="nav-label">overview</span>
</div>
<div class="nav-item" onclick="show('d1',this)" data-domain="d1">
<span class="nav-tree">├──</span><span class="nav-star" id="star-d1">[★ 0]</span><span class="nav-label">01-agentic</span><span class="nav-weight">27%</span>
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<div class="nav-item" onclick="show('d2',this)" data-domain="d2">
<span class="nav-tree">├──</span><span class="nav-star" id="star-d2">[★ 0]</span><span class="nav-label">02-tools-mcp</span><span class="nav-weight">18%</span>
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<div class="nav-item" onclick="show('d3',this)" data-domain="d3">
<span class="nav-tree">├──</span><span class="nav-star" id="star-d3">[★ 0]</span><span class="nav-label">03-claude-code</span><span class="nav-weight">20%</span>
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<div class="nav-item" onclick="show('d4',this)" data-domain="d4">
<span class="nav-tree">├──</span><span class="nav-star" id="star-d4">[★ 0]</span><span class="nav-label">04-prompt-eng</span><span class="nav-weight">20%</span>
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<div class="nav-item" onclick="show('d5',this)" data-domain="d5">
<span class="nav-tree">├──</span><span class="nav-star" id="star-d5">[★ 0]</span><span class="nav-label">05-context-mem</span><span class="nav-weight">15%</span>
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<div class="nav-item" onclick="show('s13',this)" data-domain="s13">
<span class="nav-tree">├──</span><span class="nav-star" id="star-s13">[★ 0]</span><span class="nav-label">13-scenarios</span>
</div>
<div class="nav-item" onclick="show('cheat',this)" data-domain="cheat">
<span class="nav-tree">└──</span><span class="nav-star" id="star-cheat">[★ 0]</span><span class="nav-label">cheat-sheet</span>
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<div class="sb-footer">
<div class="sb-footer-hdr">── MARKED FOR REVIEW ──</div>
<div class="sb-footer-count"><span id="footer-count">★ 0</span> items flagged</div>
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</aside>
<!-- ═══════════════ MAIN ═══════════════ -->
<main class="main">
<!-- ══════════════════════════════════════════
OVERVIEW
══════════════════════════════════════════ -->
<div id="overview" class="section active">
<div class="dom-hdr">
<h2>CCA-F · CLAUDE ARCHITECT FOUNDATIONS</h2>
<p>A project-anchored study guide built from <strong>car-e-pool-api</strong> — a production Spring Boot 4 + Telegram bot carpooling system (~18 k lines across 6 Maven modules). Every concept below is mapped to real code I already own.</p>
<div class="weight-row"><div class="weight-bar"><div class="weight-fill" style="width:100%"></div></div><div class="weight-lbl">100 % Coverage</div></div>
</div>
<div class="prog-grid">
<div class="prog-card active" onclick="show('d1',document.querySelectorAll('.nav-item')[2])">
<div class="pct">27%</div>
<div class="abbr">D1</div>
<div class="name">Agentic Systems</div>
</div>
<div class="prog-card" onclick="show('d2',document.querySelectorAll('.nav-item')[3])">
<div class="pct">20%</div>
<div class="abbr">D3</div>
<div class="name">Claude Code</div>
</div>
<div class="prog-card" onclick="show('d3',document.querySelectorAll('.nav-item')[4])">
<div class="pct">20%</div>
<div class="abbr">D4</div>
<div class="name">Prompt Engineering</div>
</div>
<div class="prog-card" onclick="show('d4',document.querySelectorAll('.nav-item')[5])">
<div class="pct">18%</div>
<div class="abbr">D2</div>
<div class="name">Tools & MCP</div>
</div>
<div class="prog-card" onclick="show('d5',document.querySelectorAll('.nav-item')[6])">
<div class="pct">15%</div>
<div class="abbr">D5</div>
<div class="name">Context & Memory</div>
</div>
</div>
<div class="g3">
<div class="card">
<h3>📦 Project Architecture</h3>
<ul>
<li><code>carpool-common</code> — shared exceptions, <code>ApiResponse</code></li>
<li><code>carpool-domain</code> — JPA entities, enums (no Spring)</li>
<li><code>carpool-repository</code> — Spring Data JPA repositories</li>
<li><code>carpool-service</code> — business logic, DTOs, MapStruct, events</li>
<li><code>carpool-bot</code> — Telegram state machine, 8 k+ LOC</li>
<li><code>carpool-web</code> — Spring Boot entry-point, JWT, REST, Flyway</li>
</ul>
</div>
<div class="card">
<h3>🔑 Key AI Touchpoints</h3>
<ul>
<li><code>AiService</code> — Spring AI + Ollama <code>llama3.1:8b</code></li>
<li><code>MessageHandler</code> — NL ride-post intent detection</li>
<li><code>.claude/agents/*.md</code> — 9 specialist subagent roles</li>
<li><code>.claude/skills/*/SKILL.md</code> — 15 custom slash commands</li>
<li><code>.claude/hooks/*.sh</code> — PreToolUse + Stop lifecycle hooks</li>
<li><code>settings.json</code> — hook wiring (Bash, Write, Edit, Stop)</li>
</ul>
</div>
<div class="card">
<h3>🎯 Exam Strategy</h3>
<ul>
<li>D1 is the heaviest domain — master loop control</li>
<li>D3 + D4 are tied — both need precision</li>
<li>Know the difference: <code>tool_use</code> vs <code>end_turn</code></li>
<li>MCP: project-scoped vs personal config files</li>
<li>Prompt caching: <code>cache_control</code> block placement</li>
<li>Never rely on NL parsing where tool_choice can force JSON</li>
</ul>
</div>
</div>
<div class="stitle">🚗 car-e-pool-api Key Facts (Project-Specific)</div>
<div class="g2">
<div class="card">
<h3>🔒 Critical Invariants</h3>
<ul>
<li>BookingService uses <code>findByIdWithLock()</code> — SELECT FOR UPDATE</li>
<li>Event listeners require all 3 annotations: <code>@Async + @TransactionalEventListener(AFTER_COMMIT) + @Transactional(REQUIRES_NEW)</code></li>
<li>Plate masking enforced in <code>EntityMapper</code> (MapStruct compile-time)</li>
<li><code>UserState.timeWindowStart</code> must always be the <em>adjusted</em> value, never raw default</li>
<li>H2 ignores SELECT FOR UPDATE — concurrency tests need real MySQL</li>
</ul>
</div>
<div class="card">
<h3>🏗️ Module Dependency Chain</h3>
<div class="flow" style="flex-direction:column;gap:.4rem">
<div class="flow-step" style="text-align:center">carpool-common (shared utils)</div>
<div class="flow-arrow" style="text-align:center">↓</div>
<div class="flow-step" style="text-align:center">carpool-domain (JPA entities, enums)</div>
<div class="flow-arrow" style="text-align:center">↓</div>
<div class="flow-step" style="text-align:center">carpool-repository (Spring Data JPA)</div>
<div class="flow-arrow" style="text-align:center">↓</div>
<div class="flow-step a" style="text-align:center">carpool-service (business logic)</div>
<div class="flow-arrow" style="text-align:center">↓ ↓</div>
<div style="display:flex;gap:.5rem;justify-content:center">
<div class="flow-step">carpool-bot</div>
<div class="flow-step">carpool-admin</div>
<div class="flow-step s">carpool-web (executable)</div>
</div>
</div>
</div>
</div>
<div class="callout wisdom">
<div class="callout-icon">[★]</div>
<div>
<h4>Architect Wisdom — The Golden Thread</h4>
<p>Every CCA-F question can be answered with one mental model: <strong>determinism beats flexibility</strong>. Structured tool calls beat natural-language parsing. Hooks beat prompt guidance. Schema-enforced JSON beats "please respond in JSON". Project-scoped config beats global config when you want reproducibility. When in doubt, choose the option that reduces ambiguity for the model.</p>
</div>
</div>
</div>
<!-- ══════════════════════════════════════════
D1: AGENTIC SYSTEMS
══════════════════════════════════════════ -->
<div id="d1" class="section">
<div class="dom-hdr">
<h2>D1 · AGENTIC SYSTEMS</h2>
<p>Covers the full lifecycle of an agentic loop: how <code>stop_reason</code> drives execution, how tool results feed back into history, orchestration topologies (hub-and-spoke vs. sequential), programmatic lifecycle hooks, and context isolation between coordinator and subagents.</p>
<div class="weight-row"><span class="weight-bar-text">█████░░░░░░░░░░░░░░░</span><span class="weight-lbl">27% exam weight</span></div>
<div class="weight-row"><div class="weight-bar"><div class="weight-fill" style="width:27%"></div></div><div class="weight-lbl">27% weight</div></div>
</div>
<!-- 1.1 The Loop -->
<div id="sd11" class="stitle">🔄 1.1 The Agentic Loop Lifecycle</div>
<p style="font-size:.875rem;color:var(--muted);margin-bottom:1rem">An agent is not a single API call — it is a loop that continues until the model signals completion. Understanding <code>stop_reason</code> is the most tested concept in this domain.</p>
<div class="g2">
<div class="card">
<h3>⏹️ stop_reason Values</h3>
<ul>
<li><strong>tool_use</strong> — model wants to call a tool; loop MUST continue by appending results</li>
<li><strong>end_turn</strong> — model finished; loop should terminate</li>
<li><strong>max_tokens</strong> — context limit hit; handle gracefully</li>
<li><strong>stop_sequence</strong> — custom stop token matched; usually terminal</li>
</ul>
</div>
<div class="card">
<h3>📜 Conversation History Rules</h3>
<ul>
<li>Tool results MUST be appended before the next API call</li>
<li>Role alternation: <code>user → assistant → user → assistant</code></li>
<li>Tool result role = <code>user</code>, not <code>tool</code></li>
<li>Never skip a tool result — the model loses context</li>
<li>Each tool result maps to its <code>tool_use_id</code></li>
</ul>
</div>
</div>
<div class="stitle">🗺️ Canonical Loop Pattern</div>
<div class="code-wrap">
<div class="code-lbl">PYTHON — Canonical Agentic Loop (CCA-F Reference Pattern)<button class="copy-btn" onclick="copyCode(this)">[COPY]</button></div>
<pre>messages = [{"role": "user", "content": user_input}]
while True:
response = client.messages.create(
model="claude-opus-4-7",
max_tokens=4096,
tools=tools,
messages=messages
)
# Always append the assistant's full response
messages.append({"role": "assistant", "content": response.content})
if response.stop_reason == "end_turn":
# Model is done — extract final text and exit
final = next(b.text for b in response.content if b.type == "text")
break
if response.stop_reason == "tool_use":
# Execute every tool call the model requested
tool_results = []
for block in response.content:
if block.type == "tool_use":
result = execute_tool(block.name, block.input)
tool_results.append({
"type": "tool_result",
"tool_use_id": block.id, # ← must match the request id
"content": result
})
# Append results as a USER message before the next call
messages.append({"role": "user", "content": tool_results})
# Loop continues — model now sees the results
else:
break # max_tokens / stop_sequence — handle accordingly</pre>
</div>
<div class="callout danger">
<div class="callout-icon">[DANGER]</div>
<div>
<h4>Anti-Pattern #1 — Skipping Tool Results</h4>
<p>Calling the API again without appending the tool result is the most common agentic bug. The model re-enters without knowing what the tool returned, leading to hallucinated results or infinite loops. The exam will test this — always append results before the next call.</p>
</div>
</div>
<!-- Project Blueprint -->
<div class="stitle">🔵 Project Blueprint — How car-e-pool-api Implements an Agentic Pattern</div>
<p style="font-size:.875rem;color:var(--muted);margin-bottom:.9rem">The Telegram bot implements a stateful, event-driven agentic loop across <code>CallbackHandler</code>, <code>MessageHandler</code>, <code>StateManager</code>, and the sub-handlers. The conversation state (<code>UserState</code>) is the analogue of <em>conversation history</em>.</p>
<div class="flow">
<div class="flow-step">Telegram Update</div><div class="flow-arrow"> ──► </div>
<div class="flow-step a">CallbackHandler / MessageHandler</div><div class="flow-arrow"> ──► </div>
<div class="flow-step">Route by BotFlow enum</div><div class="flow-arrow"> ──► </div>
<div class="flow-step a">Sub-Handler (tool execution)</div><div class="flow-arrow"> ──► </div>
<div class="flow-step">StateManager.save()</div><div class="flow-arrow"> ──► </div>
<div class="flow-step s">Bot sends response (end_turn analogue)</div>
</div>
<div class="g2">
<div class="card">
<h3>🔄 Loop Continue — <code>tool_use</code> analogue</h3>
<p style="margin-bottom:.5rem">In the bot, a "tool call" is any handler that mutates <code>UserState</code> and expects another user interaction to continue the flow:</p>
<ul>
<li><code>handleDateSelected()</code> → sets <code>flow=DEPARTURE_TIME</code>, sends time picker</li>
<li><code>handleRideTimeSelected()</code> → sets <code>flow=ORIGIN</code>, sends hub list</li>
<li>Each step waits for the next update (next "tool result")</li>
</ul>
</div>
<div class="card">
<h3>🛑 Loop Terminate — <code>end_turn</code> analogue</h3>
<p style="margin-bottom:.5rem">The loop terminates when a terminal step is reached:</p>
<ul>
<li><code>handleConfirmPostRide()</code> → publishes ride, calls <code>stateManager.reset()</code></li>
<li><code>handleCancelPostRide()</code> → discards draft, calls <code>stateManager.reset()</code></li>
<li><code>BotFlowHelper.showMainMenu()</code> → always calls <code>stateManager.reset()</code></li>
</ul>
</div>
</div>
<!-- Before vs After -->
<div class="stitle">⚡ Before vs After — Natural Language Anti-Pattern</div>
<div class="cmp">
<div class="cmp-panel bad">
<div class="cmp-hdr">❌ Anti-Pattern (pre-fix in MessageHandler)</div>
<pre>// Fragile: relies on NL parsing keywords
// MessageHandler.isNaturalLanguageRidePost()
boolean isNL = text.contains("post") &&
(text.contains("sucat") || text.contains("bgc") ||
text.contains("7am") || text.contains("bukas"));
if (isNL) {
// Calls Ollama, parses free-form JSON response
// Fails silently on bad JSON, model errors
ParsedRideRequest parsed = aiService.parseRideRequest(text);
if (parsed.isEmpty()) showFallback(); // ← silent failure path
}</pre>
</div>
<div class="cmp-panel good">
<div class="cmp-hdr">✅ Correct Pattern (structured tool_choice)</div>
<pre>// Deterministic: force schema via tool definition
// The model MUST fill every field or call fails
Tool parseRide = Tool.of("parse_ride_request",
"Extract structured ride info from natural language",
schema(Map.of(
"direction", enumOf("HOME_TO_WORK","WORK_TO_HOME"),
"departureDate", stringOf("YYYY-MM-DD"),
"departureTime", stringOf("HH:mm"),
"seats", integerOf(1, 4),
"originHint", stringOf("landmark name"),
"destinationHint",stringOf("landmark name")
), required("direction","departureDate","departureTime"))
);
response = client.messages.create(
model("claude-haiku-4-5"),
toolChoice(ToolChoice.tool("parse_ride_request")),
tools(parseRide),
messages(...)
);
// stop_reason is always "tool_use" — no ambiguity</pre>
</div>
</div>
<div class="callout wisdom">
<div class="callout-icon">[★]</div>
<div>
<h4>Architect Wisdom — Tool Choice Eliminates Ambiguity</h4>
<p>When you need structured output, use <code>tool_choice: {type: "tool", name: "..."}</code> to force the model into a specific tool call. This is more reliable than asking the model to "respond in JSON" in a system prompt. The model cannot call a different tool, cannot return plain text — the structure is enforced at the protocol level, not via prompt persuasion.</p>
</div>
</div>
<!-- 1.2 Orchestration Patterns -->
<div id="sd12" class="stitle">🕸️ 1.2 Orchestration Topologies</div>
<div class="g3">
<div class="card">
<h3>📍 Single Agent</h3>
<p>One model, one loop, all tools available. Best for focused tasks with clear termination. Used in: <code>AiService.parseRideRequest()</code> — single Ollama call, immediate result.</p>
</div>
<div class="card" style="border-color:var(--accent)">
<h3>🕸️ Hub-and-Spoke (Exam Favourite)</h3>
<p>Coordinator agent delegates to specialist subagents via tool calls. Coordinator never executes directly — it orchestrates. <strong>Car-e-pool-api parallel:</strong> <code>Claude Code</code> is the coordinator; <code>.claude/agents/*.md</code> define the 9 specialist spokes.</p>
</div>
<div class="card">
<h3>🔗 Sequential Pipeline</h3>
<p>Agent A's output becomes Agent B's input. No shared state. Used in: <code>NotificationService</code> event chain — <code>BookingService</code> commits → <code>ApplicationEventPublisher</code> fires → <code>NotificationService</code> sends DM.</p>
</div>
</div>
<div class="stitle">🏗️ Hub-and-Spoke in car-e-pool-api</div>
<div class="code-wrap">
<div class="code-lbl">.claude/agents/ — 9 Specialist Subagents (Context Isolation)<button class="copy-btn" onclick="copyCode(this)">[COPY]</button></div>
<pre>architect.md — feature planning, cross-module dependency chain
java-backend.md — Spring Boot 4, service layer, MapStruct, events
db-engineer.md — MySQL 8, Flyway migrations, JPA entity design
bot-engineer.md — Telegram bot patterns, BotContext, conversation flows
qa.md — tests-first, integration tests, concurrency tests
security.md — JWT, Telegram HMAC, OWASP, plate privacy enforcement
concurrency.md — pessimistic locking, TransactionPhase, race conditions
frontend-web.md — Next.js App Router, Telegram auth, JWT cookie
flutter-mobile.md — Flutter, Riverpod, Dio, go_router, freezed
// Each agent receives ONLY what it needs — coordinator never dumps
// the full conversation into each subagent's context.
// This is context isolation: the key property of hub-and-spoke.</pre>
</div>
<!-- 1.3 Lifecycle Hooks -->
<div class="stitle">🪝 1.3 PreToolUse / PostToolUse Lifecycle Hooks</div>
<p style="font-size:.875rem;color:var(--muted);margin-bottom:.9rem">Hooks fire <em>before</em> or <em>after</em> tool execution and can block, modify, or log. They enforce policies programmatically — stronger than system-prompt instructions because they execute outside model context.</p>
<div class="g2">
<div class="card">
<h3>🔒 Our settings.json Hook Config</h3>
<div class="code-wrap" style="margin-top:.5rem">
<pre>{
"hooks": {
"PreToolUse": [
{
"matcher": "Bash",
"hooks": [{ "type": "command",
"command": "bash .claude/hooks/guard-bash.sh" }]
},
{
"matcher": "Write",
"hooks": [
{ "type":"command","command":"bash .claude/hooks/flyway-gate.sh" },
{ "type":"command","command":"bash .claude/hooks/module-boundary-check.sh" }
]
},
{
"matcher": "Edit",
"hooks": [
{ "type":"command","command":"bash .claude/hooks/flyway-gate.sh" },
{ "type":"command","command":"bash .claude/hooks/module-boundary-check.sh" }
]
}
],
"Stop": [
{ "hooks": [{ "type":"command",
"command": "bash .claude/hooks/vault-writeback.sh" }] }
]
}
}</pre>
</div>
</div>
<div class="card">
<h3>🛡️ What Each Hook Enforces</h3>
<ul>
<li><strong>guard-bash.sh</strong> — blocks <code>rm -rf</code>, <code>DROP TABLE</code>, <code>--force-push</code></li>
<li><strong>flyway-gate.sh</strong> — enforces <code>V#__description.sql</code> naming; blocks editing any existing migration file</li>
<li><strong>module-boundary-check.sh</strong> — blocks illegal cross-module Java imports (e.g., <code>carpool-bot</code> importing <code>carpool-web</code>)</li>
<li><strong>vault-writeback.sh</strong> — on session stop: auto-creates dispatch log in <code>memory/dispatch-logs/</code></li>
</ul>
<div class="callout tip" style="margin-top:.75rem">
<div class="callout-icon">[TIP]</div>
<div><h4>Exam Key</h4><p>Hooks exit non-zero to <em>block</em> the tool call. Exit zero to <em>allow</em>. The model cannot override a blocking hook via prompting — this is the core advantage over system-prompt policies.</p></div>
</div>
</div>
</div>
<div class="cmp">
<div class="cmp-panel bad">
<div class="cmp-hdr">❌ Weak — Prompt-Only Policy</div>
<pre># In CLAUDE.md or system prompt:
"IMPORTANT: Never edit existing Flyway
migration files. Always create new ones
with the next version number."
// Problem: Model can "forget", be confused
// by context, or be talked out of it.
// Zero enforcement at execution time.</pre>
</div>
<div class="cmp-panel good">
<div class="cmp-hdr">✅ Strong — Hook-Enforced Policy</div>
<pre># In settings.json PreToolUse for Write/Edit:
bash .claude/hooks/flyway-gate.sh
# flyway-gate.sh checks the target file path:
if [[ "$FILE" =~ V[0-9]+__.+\.sql$ ]]; then
if [[ "$FILE" == *"db/migration"* ]]; then
# Existing migration → block with exit 1
echo "ERROR: Editing existing migration forbidden"
exit 1
fi
fi
# New file or non-migration → allow with exit 0</pre>
</div>
</div>
<!-- ─────────────────────────────────────── -->
<!-- 1.5 Hook Security Best Practices -->
<!-- ─────────────────────────────────────── -->
<div id="sd15hooks" class="stitle">🔐 1.5 Hook Security Best Practices<span class="sub-tag">SD 1.5</span></div>
<p style="font-size:.875rem;color:var(--muted);margin-bottom:.9rem">Hooks run with the same OS permissions as the developer and receive AI-generated input. That combination makes them a meaningful attack surface. The official Claude Code documentation defines five mandatory hardening practices — all five appear in <strong>car-e-pool-api</strong>'s hook files and are tested on the CCA-F exam.</p>
<div class="callout danger">
<div class="callout-icon">[RISK]</div>
<div>
<h4>Why Hook Security Is AI-Specific</h4>
<p>In a conventional CI script the operator controls the input. In an agentic hook the <em>model</em> proposes the file path, command, or argument that the hook receives. A crafted or hallucinated path like <code>../../.env</code> can bypass a domain-specific check (e.g. "only act on db/migration files") and expose a secret. Every hook must treat its input as untrusted.</p>
</div>
</div>
<!-- Practice 1 — Structured JSON parsing -->
<div id="hp1" class="stitle" style="font-size:.82rem;margin-top:1.2rem;margin-bottom:.5rem">① Validate and Sanitize Inputs — Never Trust Tool Input JSON Blindly</div>
<p style="font-size:.83rem;color:var(--muted);margin-bottom:.7rem">Hooks receive a JSON blob on stdin describing the tool call. Parse it with a real JSON parser — never split on whitespace or use shell parameter expansion to extract values.</p>
<div class="cmp">
<div class="cmp-panel bad">
<div class="cmp-hdr">❌ Insecure — Raw String Extraction</div>
<pre>#!/usr/bin/env bash
# Raw stdin split — fragile and injectable
INPUT=$(cat)
# A path with spaces or special chars breaks this:
FILE_PATH=$(echo "$INPUT" | grep -o '"file_path":"[^"]*"' \
| cut -d'"' -f4)
# If model sends: {"file_path":"foo\";rm -rf /;echo \""}
# the grep/cut approach may pass a malformed value through</pre>
</div>
<div class="cmp-panel good">
<div class="cmp-hdr">✅ Secure — Structured JSON Parsing</div>
<pre>#!/usr/bin/env bash
INPUT=$(cat)
# python3 json.load handles escapes, unicode, edge cases
FILE_PATH=$(echo "$INPUT" | python3 -c "
import json, sys
data = json.load(sys.stdin)
# KeyError → empty string, never crashes the hook
print(data.get('tool_input', {}).get('file_path', ''))
" 2>/dev/null || echo "")
# FILE_PATH is now a clean, properly decoded string</pre>
</div>
</div>
<!-- Practice 2 — Quote shell variables -->
<div id="hp2" class="stitle" style="font-size:.82rem;margin-top:1.2rem;margin-bottom:.5rem">② Always Quote Shell Variables — Prevent Word Splitting and Globbing</div>
<p style="font-size:.83rem;color:var(--muted);margin-bottom:.7rem">An unquoted variable containing spaces, <code>*</code>, or <code>?</code> undergoes shell word-splitting and globbing. In a hook that receives AI-generated paths, this is a reliable source of unexpected behaviour.</p>
<div class="cmp">
<div class="cmp-panel bad">
<div class="cmp-hdr">❌ Insecure — Unquoted Variable</div>
<pre>#!/usr/bin/env bash
FILE_PATH=$(extract_path "$INPUT")
# If FILE_PATH = "some dir/V45__add column.sql"
# the space causes word-splitting:
if echo $FILE_PATH | grep -q "db/migration"; then
# ^^^^^^^^^^ → treated as two arguments:
# echo "some" "dir/V45__add" "column.sql"
exit 1
fi
# Globbing risk: if FILE_PATH = "*.sql"
# echo *.sql expands to ALL .sql files in CWD</pre>
</div>
<div class="cmp-panel good">
<div class="cmp-hdr">✅ Secure — Always Quote</div>
<pre>#!/usr/bin/env bash
FILE_PATH=$(extract_path "$INPUT") # ← quote here too
# Quote in every context: conditionals, grep, echo, test
if echo "$FILE_PATH" | grep -q "db/migration"; then
# ^^^^^^^^^^^ ← quoted: one argument, no splitting
exit 1
fi
# Quote in test expressions too:
if [[ "$FILE_PATH" == *".sql" ]]; then
# safe — [[ ]] suppresses globbing even unquoted,
# but quoting is still the correct habit everywhere
fi</pre>
</div>
</div>
<!-- Practice 3 — Block path traversal -->
<div id="hp3" class="stitle" style="font-size:.82rem;margin-top:1.2rem;margin-bottom:.5rem">③ Block Path Traversal — Check for <code>..</code> Before Using Any File Path</div>
<p style="font-size:.83rem;color:var(--muted);margin-bottom:.7rem">A domain-specific check (e.g. "only act on <code>db/migration</code> files") does not protect against <code>../../.env</code> — that path doesn't match the guard, so execution continues with a sensitive file. The traversal check must come <em>first</em>, before any domain logic.</p>
<div class="cmp">
<div class="cmp-panel bad">
<div class="cmp-hdr">❌ Insecure — Domain Check Only</div>
<pre>#!/usr/bin/env bash
FILE_PATH=$(parse_path "$INPUT")
# Domain check — looks safe…
if ! echo "$FILE_PATH" | grep -q "db/migration"; then
exit 0 # ← "not a migration file, skip"
fi
# BYPASSED by: ../../db/migration/../../.env
# grep finds "db/migration" substring → continues
# actual operation targets .env</pre>
</div>
<div class="cmp-panel good">
<div class="cmp-hdr">✅ Secure — Traversal Check First</div>
<pre>#!/usr/bin/env bash
FILE_PATH=$(parse_path "$INPUT")
# ① Traversal guard — MUST come before all domain logic
if echo "$FILE_PATH" | grep -q '\.\.'; then
echo "BLOCKED: path traversal detected: $FILE_PATH" >&2
exit 2 # exit 2 = security block (distinct from exit 1)
fi
# ② Sensitive file guard (see practice 5)
# ...
# ③ Domain logic — now safe to apply
if ! echo "$FILE_PATH" | grep -q "db/migration"; then
exit 0
fi</pre>
</div>
</div>
<!-- Practice 4 — Use absolute paths -->
<div id="hp4" class="stitle" style="font-size:.82rem;margin-top:1.2rem;margin-bottom:.5rem">④ Use Absolute Paths — Hooks May Run From an Unpredictable CWD</div>
<p style="font-size:.83rem;color:var(--muted);margin-bottom:.7rem">The hook dispatcher does not guarantee that <code>$PWD</code> is the project root when the hook runs. Relative paths like <code>memory/dispatch-logs</code> silently write to the wrong location. Resolve to absolute using <code>git rev-parse --show-toplevel</code>.</p>
<div class="cmp">
<div class="cmp-panel bad">
<div class="cmp-hdr">❌ Insecure — Relative Path</div>
<pre>#!/usr/bin/env bash
# vault-writeback.sh — original version
LOG_DIR="memory/dispatch-logs"
LOG_FILE="$LOG_DIR/$DATE.md"
mkdir -p "$LOG_DIR"
# If CWD is not the project root (e.g. the hook
# dispatcher sets CWD to the user's home dir),
# the log silently writes to ~/memory/dispatch-logs
# — or mkdir creates the wrong directory tree</pre>
</div>
<div class="cmp-panel good">
<div class="cmp-hdr">✅ Secure — Absolute Path via git rev-parse</div>
<pre>#!/usr/bin/env bash
# vault-writeback.sh — hardened version
PROJECT_ROOT=$(git rev-parse --show-toplevel 2>/dev/null \
|| dirname "$(dirname "$(readlink -f "$0")")")
LOG_DIR="$PROJECT_ROOT/memory/dispatch-logs"
LOG_FILE="$LOG_DIR/$DATE.md"
mkdir -p "$LOG_DIR"
# LOG_DIR is always the correct absolute path
# regardless of what CWD the dispatcher uses
# Same principle applies to ALL path constructions
# in hooks: config files, temp dirs, output files</pre>
</div>
</div>
<div class="callout warn">
<div class="callout-icon">[WARN]</div>
<div>
<h4>Bare Commands Like <code>mvn</code> Depend on PATH</h4>
<p>Hooks that invoke build tools (e.g. <code>compile-check.sh</code> runs <code>mvn test-compile</code>) rely on <code>mvn</code> being on the shell's <code>$PATH</code>. This is correct on a developer workstation but can fail silently in a stripped CI environment or when the hook dispatcher uses a minimal environment. Known risk — document it; for portable hooks use the absolute Maven wrapper path: <code>./mvnw</code> or <code>$PROJECT_ROOT/mvnw</code>.</p>
</div>
</div>
<!-- Practice 5 — Sensitive file guard -->
<div id="hp5" class="stitle" style="font-size:.82rem;margin-top:1.2rem;margin-bottom:.5rem">⑤ Skip Sensitive Files — Block Writes to Credentials Regardless of Domain Logic</div>
<p style="font-size:.83rem;color:var(--muted);margin-bottom:.7rem">Write/Edit hooks must explicitly reject operations on credential files. This guard is independent of — and must precede — any domain-specific logic. Applies to <em>every</em> hook wired to Write/Edit events.</p>
<div class="cmp">
<div class="cmp-panel bad">
<div class="cmp-hdr">❌ Insecure — No Sensitive File Check</div>
<pre>#!/usr/bin/env bash
FILE_PATH=$(parse_path "$INPUT")
# flyway-gate only checks for migration files.
# A crafted path to .env passes through untouched:
# FILE_PATH = "carpool-web/src/main/resources/.env"
# → no migration pattern match → exit 0 → write allowed
if ! echo "$FILE_PATH" | grep -q "db/migration"; then
exit 0 # ← .env gets through here
fi
# ... migration-specific checks below</pre>
</div>
<div class="cmp-panel good">
<div class="cmp-hdr">✅ Secure — Sensitive File Guard</div>
<pre>#!/usr/bin/env bash
FILE_PATH=$(parse_path "$INPUT")
# ① Traversal guard (practice 3)
if echo "$FILE_PATH" | grep -q '\.\.'; then
echo "BLOCKED: path traversal" >&2; exit 2
fi
# ② Sensitive file guard — before ALL domain logic
if echo "$FILE_PATH" | grep -qE \
'(^|/)\.(env|git)(/|$)|\.pem$|\.key$|\.p12$|\.jks$|\.pkcs12$'; then
echo "BLOCKED: sensitive file: $FILE_PATH" >&2
exit 2
fi
# ③ Domain logic — now safe
if ! echo "$FILE_PATH" | grep -q "db/migration"; then
exit 0
fi</pre>
</div>
</div>
<!-- Summary table -->
<div class="tbl-wrap" style="margin-top:1.2rem">
<table>
<tr><th>#</th><th>Practice</th><th>Mechanism</th><th>Our Hook</th><th>Exam Trap</th></tr>
<tr><td>①</td><td>Validate inputs</td><td><code>python3 json.load(sys.stdin)</code></td><td>All hooks (<code>parse_path</code> helper)</td><td>Using <code>grep -o</code> / <code>cut</code> to extract JSON fields — broken by special chars</td></tr>
<tr><td>②</td><td>Quote variables</td><td><code>"$VAR"</code> everywhere</td><td>All hooks</td><td>Unquoted <code>$FILE_PATH</code> with a space → word-split into multiple arguments</td></tr>
<tr><td>③</td><td>Block traversal</td><td><code>grep -q '\.\.'</code> → <code>exit 2</code></td><td><code>flyway-gate.sh</code>, <code>module-boundary-check.sh</code></td><td>Relying on domain check alone — <code>../../db/migration/../../.env</code> satisfies "db/migration" grep</td></tr>
<tr><td>④</td><td>Absolute paths</td><td><code>git rev-parse --show-toplevel</code></td><td><code>vault-writeback.sh</code></td><td>Relative <code>LOG_DIR</code> writes to wrong location when CWD ≠ project root</td></tr>
<tr><td>⑤</td><td>Skip sensitive files</td><td><code>grep -qE '\.env|\.pem|\.key…'</code> → <code>exit 2</code></td><td><code>flyway-gate.sh</code>, <code>module-boundary-check.sh</code></td><td>Hook exits 0 on "not a migration" without checking whether the target IS a credential file</td></tr>
</table>
</div>
<div class="callout wisdom">
<div class="callout-icon">[★]</div>
<div>
<h4>Architect Wisdom — exit 2 vs exit 1</h4>
<p>By convention in car-e-pool-api hooks: <code>exit 1</code> = policy violation (wrong migration name, illegal import), <code>exit 2</code> = security block (path traversal, sensitive file). Both cause Claude Code to treat the tool call as blocked. The distinction is for operators reading hook logs — a security block warrants a different response than a naming convention violation.</p>
</div>
</div>
<!-- 1.4 Context Isolation -->
<div class="stitle">🔒 1.4 Context Isolation Between Coordinator and Subagents</div>
<div class="callout info">
<div class="callout-icon">[INFO]</div>
<div>
<h4>The Principle</h4>
<p>A coordinator agent should pass only the <em>minimum necessary context</em> to each subagent. The coordinator synthesizes results itself — it does not dump its full conversation history into every subagent call. This keeps subagent prompts focused, reduces token cost, and prevents context poisoning.</p>
</div>
</div>
<div class="g2">
<div class="card">
<h3>✅ Correct — Targeted Handoff</h3>
<div class="code-wrap" style="margin-top:.5rem">
<pre># Coordinator sends to db-engineer agent:
"Add a NOT NULL column `group_message_posted_at
TIMESTAMP` to the rides table. The existing
migration is V44. Write V45."