bytedance/deer-flow · error · ValueError

mem0 failure_policy.write must be one of {sorted(_WRITE_POLI

Error message

mem0 failure_policy.write must be one of {sorted(_WRITE_POLICIES)}

What it means

Raised by Mem0Config.from_backend_config when memory.backend_config.failure_policy.write is not one of the two supported values: log_and_drop (default; write errors are logged and the memory write is dropped — at-most-once semantics) and raise (write errors raise MemoryManagerError). Checked after str() coercion, so typos and case variants are rejected.

Source

Thrown at backend/packages/harness/deerflow/agents/memory/backends/mem0/config.py:101

        config = cls(
            api_key_env=str(cfg.get("api_key_env", "MEM0_API_KEY")),
            base_url=str(cfg.get("base_url", "https://api.mem0.ai")).rstrip("/"),
            allow_insecure_http=allow_insecure_http,
            top_k=int(cfg.get("top_k", 8)),
            score_threshold=float(cfg.get("score_threshold", 0.1)),
            max_injection_chars=int(cfg.get("max_injection_chars", 12000)),
            timeout_seconds=float(cfg.get("timeout_seconds", 10.0)),
            startup_policy=str(cfg.get("startup_policy", "fail_fast")),
            read_policy=str(failure_policy.get("read", "fail_open")),
            write_policy=str(failure_policy.get("write", "log_and_drop")),
        )
        if config.startup_policy not in _STARTUP_POLICIES:
            raise ValueError(f"mem0 startup_policy must be one of {sorted(_STARTUP_POLICIES)}")
        if config.read_policy not in _READ_POLICIES:
            raise ValueError(f"mem0 failure_policy.read must be one of {sorted(_READ_POLICIES)}")
        if config.write_policy not in _WRITE_POLICIES:
            raise ValueError(f"mem0 failure_policy.write must be one of {sorted(_WRITE_POLICIES)}")
        if not 1 <= config.top_k <= 1000:
            raise ValueError("mem0 top_k must be in [1, 1000]")
        if not 0.0 <= config.score_threshold <= 1.0:
            raise ValueError("mem0 score_threshold must be in [0, 1]")
        if config.max_injection_chars <= 0:
            raise ValueError("mem0 max_injection_chars must be positive")
        if config.timeout_seconds <= 0:
            raise ValueError("mem0 timeout_seconds must be positive")
        if not config.api_key_env.strip():
            raise ValueError("mem0 api_key_env must be a non-empty env var name")
        parsed_base_url = urlsplit(config.base_url)
        if parsed_base_url.scheme not in {"http", "https"} or not parsed_base_url.netloc:
            raise ValueError("mem0 base_url must be an absolute http:// or https:// URL")
        if parsed_base_url.scheme == "http" and not config.allow_insecure_http:
            raise ValueError("mem0 base_url must use https:// because it carries the API key; set allow_insecure_http: true only for trusted local development")
        return config

    def resolve_api_key(self) -> str:

View on GitHub (pinned to 1dd6ba1acb)

Solutions

1. Use exactly log_and_drop (default, fire-and-forget writes) or raise (writes fail the operation)
2. There is no write-retry policy — put retry/queueing concerns in the surrounding infra, not this key
3. Remove the write key to accept the log_and_drop default

Example fix

# before (config.yaml)
memory:
  backend_config:
    failure_policy:
      write: log-and-drop   # hyphens not accepted

# after
memory:
  backend_config:
    failure_policy:
      write: log_and_drop

WRITE_POLICIES = {"log_and_drop", "raise"}

def write_policy_ok(backend_config: dict) -> bool:
    fp = (backend_config or {}).get("failure_policy") or {}
    return str(fp.get("write", "log_and_drop")) in WRITE_POLICIES

def is_write_policy(v: object) -> bool:
    return v in ("log_and_drop", "raise")

When it happens

Trigger: failure_policy: {write: drop}, {write: log-and-drop}, {write: retry}, or {write: Raise} in backend_config.

Common situations: Trying to configure a retry behavior that does not exist (write policy is only log_and_drop or raise); hyphenated instead of underscored spelling; copy-paste from other systems.

Related errors

• mem0 failure_policy.read must be one of {sorted(_READ_POLICI
• mem0 backend_config has unknown keys: {sorted(unknown)}
• mem0 failure_policy must be a mapping {read, write}
• mem0 failure_policy has unknown keys: {sorted(unknown_fp)}
• mem0 allow_insecure_http must be a boolean

AI-assisted analysis of bytedance/deer-flow@1dd6ba1acb (2026-08-14). Data as JSON: /api/errors/ed0eb684ae466bf0. Report an issue: GitHub.