# Tüm agent'lar aynı project context'i kullanır → aynı cache prefix
PROJECT_CONTEXT = open("project_brief.md").read() + open("codebase_summary.md").read()
# ~30K token, stabil
 
def researcher_agent(task):
    return client.messages.create(
        model="claude-sonnet-4-6",
        system=[
            {"text": PROJECT_CONTEXT, "cache_control": {"ttl": "1h"}},     # ← shared cache key
            {"text": RESEARCHER_PROMPT, "cache_control": {"ttl": "5m"}},
        ],
        messages=[{"role": "user", "content": task}],
    )
 
def coder_agent(task):
    return client.messages.create(
        model="claude-sonnet-4-6",
        system=[
            {"text": PROJECT_CONTEXT, "cache_control": {"ttl": "1h"}},     # ← AYNI prefix
            {"text": CODER_PROMPT, "cache_control": {"ttl": "5m"}},
        ],
        messages=[{"role": "user", "content": task}],
    )
 
# Anthropic cache: hem researcher hem coder PROJECT_CONTEXT cache hit
# (aynı prefix paylaşılıyor)