Manually create bidirectional links between memories WHEN: You or the user decide that a memory wants to connect a related concept not caught by auto-linking, establish a relationship between memories, or build a knowledge graph structure. BEHAVIOUR: Creates a symmetric (bidirectional) links - if...
AI agents use link_memories to create or update resources in Forgetful — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Forgetful environment.
This tool creates relationships (links) between existing memory entries. It modifies data by adding link records but does not delete or overwrite anything, making it a reversible Write operation. The blast radius is low since misuse only results in unwanted associations between memories, which can be corrected.
From the tool's definition Manually create bidirectional links between memories... Creates a symmetric (bidirectional) links - if A links to B, B automatically links to A
Documented attack patterns abuse exactly the kind of access link_memories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Forgetful, and nothing reaches the server without passing your rules. This is the rule we recommend for link_memories:
{
"version": "1",
"default": "deny",
"tools": {
"link_memories": {
"limits": [
{
"counter": "link_memories_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}link_memories 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.
Manually create bidirectional links between memories WHEN: You or the user decide that a memory wants to connect a related concept not caught by auto-linking, establish a relationship between memories, or build a knowledge graph structure. BEHAVIOUR: Creates a symmetric (bidirectional) links - if A links to B, B automatically links to A Prevents duplicate and self linking. NOT-USE: Auto-linking during creation (happens automatically in create_memory), retrieving linked memories (use query_memory with include_links) Args: memory_id: Source memory ID related_ids: List of target memory IDs Returns: List of target memory IDs that were successfully linked. It is categorised as a Write tool in the Forgetful MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Forgetful MCP server in PolicyLayer and add a rule for link_memories: 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 Forgetful. Nothing to install.
link_memories 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 link_memories 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 link_memories. 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.
link_memories is provided by the Forgetful MCP server (scottrbk/forgetful). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 59 Forgetful tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
59 Forgetful tools catalogued and risk-classified — across an index of 42,500+ MCP servers.