AI agents use grow to create or update resources in Ombre Brain — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ombre Brain environment.
The tool archives diary entries and writes them into memory buckets. This is a Write operation — it creates or modifies persistent memory records. It does not appear to delete or execute code, but it does persistently store emotional memory data across conversations, which could have moderate blast radius if misused (e.g., polluting long-term memory with incorrect or manipulative entries).
From the tool's definition 日记归档。自动拆分长内容为多个记忆桶。 (Diary archiving. Automatically splits long content into multiple memory buckets.)
Documented attack patterns abuse exactly the kind of access grow gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ombre Brain, and nothing reaches the server without passing your rules. This is the rule we recommend for grow:
{
"version": "1",
"default": "deny",
"tools": {
"grow": {
"limits": [
{
"counter": "grow_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}grow stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
日记归档。自动拆分长内容为多个记忆桶。. It is categorised as a Write tool in the Ombre Brain MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ombre Brain MCP server in PolicyLayer and add a rule for grow: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Ombre Brain. Nothing to install.
grow is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the grow rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for grow. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
grow is provided by the Ombre Brain MCP server (p0lar1zzz/ombre-brain). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Ombre Brain tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
6 Ombre Brain tools catalogued and risk-classified — across an index of 42,500+ MCP servers.