niahub_save_context · Niahub MCP: Risk & Policy

WHAT IT DOES

What niahub_save_context does on Niahub

AI agents use niahub_save_context to create or update resources in Niahub — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Niahub environment.

WHY IT NEEDS A POLICY

Why niahub_save_context needs a policy

This tool creates or modifies data (user session memory) in a reversible manner. It is not destructive since saved values can be overwritten or cleared. It does not retrieve data (Read), execute arbitrary operations (Execute), delete data permanently (Destructive), or move money (Financial).

From the tool's definition Tool description states 'Save a value to cross-session memory keyed by the current user' — this modifies persisted state by writing data to a user-keyed memory store.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

niahub_save_context Rate-limited

niahub_save_context 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "niahub_save_context": {
      "limits": [
        {
          "counter": "niahub_save_context_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Niahub, so you can run agents against it safely.

FAQ

Questions about niahub_save_context

What does the niahub_save_context tool do? +

Save a value to cross-session memory keyed by the current user. It is categorised as a Write tool in the Niahub MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on niahub_save_context? +

Register the Niahub MCP server in PolicyLayer and add a rule for niahub_save_context: 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 Niahub. Nothing to install.

What risk level is niahub_save_context? +

niahub_save_context is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit niahub_save_context? +

Yes. Add a rate_limit block to the niahub_save_context 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.

How do I block niahub_save_context completely? +

Set action: deny in the PolicyLayer policy for niahub_save_context. 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.

What MCP server provides niahub_save_context? +

niahub_save_context is provided by the Niahub MCP server (kush614/niahub). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.