code-reuse-enforcement

Code Reuse Enforcement

CRITICAL GUARDRAIL: Discover existing code BEFORE writing new code.

Why This Matters

• Magic strings scatter across 50 files instead of 1 constant
• Duplicate utilities create maintenance nightmares
• Inconsistent values break features silently

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The Discovery-First Workflow

BEFORE writing ANY code with literals or utilities:

1. Check Constants - URLs, paths, timeouts, limits, env var names
2. Check Enums - States, statuses, types, actions
3. Check Utilities - Path ops, env reading, file ops, validation

Quick Reference: discovery-catalog.md

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Common Violations

Magic Strings

# ❌ BAD
url = "https://ai-debugger.com/support"
log_dir = ".aidb/log"
debug = os.getenv("AIDB_LOG_LEVEL", "INFO")

# ✅ GOOD
from aidb_common.constants import AIDB_BASE_URL
from aidb_common.path import get_aidb_log_dir
from aidb_logging.utils import get_log_level

url = f"{AIDB_BASE_URL}/support"
log_dir = get_aidb_log_dir()
log_level = get_log_level(default="INFO")

Magic Numbers

# ❌ BAD
await asyncio.sleep(0.1)
timeout = 5.0

# ✅ GOOD
from aidb.common.constants import EVENT_POLL_TIMEOUT_S, CONNECTION_TIMEOUT_S

await asyncio.sleep(EVENT_POLL_TIMEOUT_S)
timeout = CONNECTION_TIMEOUT_S

Reimplementing Utilities

# ❌ BAD
def get_bool_env(name: str, default: bool) -> bool:
    value = os.getenv(name)
    return value.lower() in ("true", "1", "yes") if value else default

# ✅ GOOD
from aidb_common.env import read_bool
result = read_bool("AIDB_TRACE", default=False)

String States

# ❌ BAD
if session_state == "running":
    pass

# ✅ GOOD
from aidb_mcp.core.constants import SessionState
if session_state == SessionState.RUNNING:
    pass

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