refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조

에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게
[공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류.
문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인).

- Topic_Programming → Domain_Programming (내부 구조 보존)
- Topic_Graphic → Domain_Design
- Topic_Business → Domain_Product
- Topic_General → Domain_General
- _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning),
  Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing)
- 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서)
- 빈 폴더 정리 (memory/procedures)
- 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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---
id: wiki-2026-0508-tool-usage-optimization
title: Tool Usage Optimization
category: 10_Wiki/Topics
status: verified
canonical_id: self
aliases: [Function Calling, Tool Use, Agent Tools]
duplicate_of: none
source_trust_level: A
confidence_score: 0.9
verification_status: applied
tags: [llm, tool-use, function-calling, agentic]
raw_sources: []
last_reinforced: 2026-05-10
github_commit: pending
tech_stack:
language: Python
framework: Anthropic SDK / OpenAI SDK / MCP
---
# Tool Usage Optimization
## 매 한 줄
> **"매 LLM의 외부 capability 의 invoke"**. Tool use (function calling) 매 LLM 이 external API/code/DB 의 structured call 하는 패러다임. 2023 OpenAI function calling → 2024 parallel tools → 2025 MCP standard → 2026 매 every agent 의 backbone. 매 quality 매 tool 정의의 crisp / parallel call / error handling / cache strategy 에 의해 결정.
## 매 핵심
### 매 핵심 mechanics
- **Schema** — 매 JSON Schema 로 tool input 정의 — 매 model 이 fill.
- **Choice** — `auto` / `tool` (forced) / `none`.
- **Parallel** — 매 single turn 에 multiple tool calls (Claude / GPT-4o+).
- **Iterative loop** — 매 tool result 의 feed back → continue → repeat.
### 매 design principles
- **Crisp descriptions** — 매 tool description 매 "use this when X, not when Y" 명시.
- **Few well-named tools** > 매 many overlapping — 매 selection error rate 의 reduce.
- **Idempotent / safe** — 매 retry-safe — 매 LLM 매 retry 함.
- **Structured errors** — 매 tool error 매 LLM 이 recover 할 수 있게 actionable.
### 매 modern (2025-2026)
- **MCP (Model Context Protocol)** — 매 Anthropic 이 2024-11 release. 매 client/server tool sharing standard. 매 Claude Desktop, Cursor, Windsurf 모두 support.
- **Tool result caching** — 매 expensive tool (DB query, web fetch) 매 cache + hash check.
- **Tool budget** — 매 agent 의 max-call limit 의 prevent runaway.
### 매 응용
1. Code agents (file ops, shell, search).
2. Customer support (ticket, KB, account API).
3. Data analysis (SQL, plot, fetch).
## 💻 패턴
### Anthropic tool definition
```python
tools = [{
"name": "get_weather",
"description": "Get current weather. Use ONLY for weather; do not use for forecasts beyond 24h.",
"input_schema": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "City, country (e.g. 'Seoul, KR')"},
"unit": {"type": "string", "enum": ["c", "f"], "default": "c"},
},
"required": ["location"],
},
}]
resp = client.messages.create(
model="claude-opus-4-7",
max_tokens=2000,
tools=tools,
messages=[{"role": "user", "content": "Weather in Seoul?"}],
)
```
### Parallel tool execution
```python
import asyncio
async def run_tool(call):
return await TOOLS[call.name](**call.input)
# 매 LLM이 매 multiple tool_use blocks 의 emit
calls = [b for b in resp.content if b.type == "tool_use"]
results = await asyncio.gather(*(run_tool(c) for c in calls))
# 매 모든 result 의 single user message 로 feed back
```
### Tool loop (agentic)
```python
messages = [{"role": "user", "content": user_query}]
for _ in range(MAX_TURNS):
resp = client.messages.create(model="claude-opus-4-7", tools=tools, messages=messages)
messages.append({"role": "assistant", "content": resp.content})
if resp.stop_reason != "tool_use":
break
tool_results = [
{"type": "tool_result", "tool_use_id": b.id,
"content": str(TOOLS[b.name](**b.input))}
for b in resp.content if b.type == "tool_use"
]
messages.append({"role": "user", "content": tool_results})
```
### Structured error
```python
def search_db(query: str):
try:
return {"ok": True, "rows": db.execute(query).fetchall()}
except SQLError as e:
return {"ok": False, "error": str(e),
"hint": "Check column names; use `\\d table` to inspect."}
```
### Result caching
```python
import hashlib, json, functools
@functools.lru_cache(maxsize=1024)
def _cached_fetch(url_hash: str, url: str):
return requests.get(url, timeout=10).text
def web_fetch(url: str):
return _cached_fetch(hashlib.sha256(url.encode()).hexdigest(), url)
```
### Prompt cache + tools (Anthropic)
```python
resp = client.messages.create(
model="claude-opus-4-7",
tools=tools, # 매 tools 의 cacheable
system=[{"type": "text", "text": SYSTEM, "cache_control": {"type": "ephemeral"}}],
messages=messages,
)
```
### MCP server (Python)
```python
from mcp.server.fastmcp import FastMCP
mcp = FastMCP("my-tools")
@mcp.tool()
def query_orders(customer_id: str) -> list[dict]:
"""Return recent orders for a customer."""
return db.fetch_orders(customer_id)
if __name__ == "__main__":
mcp.run()
```
## 매 결정 기준
| 상황 | Approach |
|---|---|
| Few tools, in-app | Direct SDK tools |
| Many shared tools across apps | MCP server |
| Latency-critical | Pre-fetch / parallel tools |
| Expensive tools | Cache by input hash |
| Untrusted LLM output | Validate + sandbox tool exec |
| Long agent loop | Tool budget + checkpoint |
**기본값**: 매 5-15 well-named tools, parallel calling enabled, structured errors, prompt caching on system + tool definitions.
## 🔗 Graph
- 변형: [[Function-Calling]] · [[MCP]] · [[ReAct]]
- 응용: [[Code-Agent]]
- Adjacent: [[RAG]] · [[Structured-Output]]
## 🤖 LLM 활용
**언제**: 매 external state / capability 의 필요한 모든 LLM app — search, DB, email, code exec, API call.
**언제 X**: 매 pure text generation (summary, translate) — 매 tool 매 unnecessary.
## ❌ 안티패턴
- **Vague tool names**: `"do_thing"` — 매 LLM 매 selection 의 fail.
- **Too many tools**: 매 30+ tool 매 confuse — 매 group / route.
- **No retry on transient error**: 매 502 / timeout 매 transient — 매 retry-safe + LLM 의 hint.
- **Streaming tool output to user mid-call**: 매 tool result 매 internal — final assistant text 만 user 에.
- **No max-turn limit**: 매 infinite loop 의 risk.
## 🧪 검증 / 중복
- Verified (Anthropic tool use docs, OpenAI function calling, MCP spec 2024-11, parallel tool calling).
- 신뢰도 A.
## 🕓 Changelog
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | Manual cleanup — modern tool use + MCP + caching patterns |