bases_upsert_config

THE RISK

Medium Risk

Why bases_upsert_config needs a policy

This tool creates or modifies configuration files (.base config), which are reversible changes. It does not delete data (Destructive), execute arbitrary code (Execute), or move money (Financial).

From the tool's definition Tool name 'bases_upsert_config' uses 'upsert' (update or insert), and description explicitly references 'replacement' of '.base config'. The 'headless-guarded' qualifier indicates it validates but still permits modification of configuration files.

Documented attack patterns abuse exactly the kind of access bases_upsert_config gives an agent:

POLICY

How to control bases_upsert_config

PolicyLayer is an MCP gateway — it sits between your AI agents and Optimike Obsidian MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for bases_upsert_config:

policy.json

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

bases_upsert_config 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.

Create a free account and register Optimike Obsidian MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

More Optimike Obsidian MCP tools

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All 15 Optimike Obsidian MCP tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about bases_upsert_config

What does the bases_upsert_config tool do? +

Headless-guarded filesystem .base config replacement/validation. It is categorised as a Write tool in the Optimike Obsidian MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on bases_upsert_config? +

Register the Optimike Obsidian MCP server in PolicyLayer and add a rule for bases_upsert_config: 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 Optimike Obsidian MCP. Nothing to install.

What risk level is bases_upsert_config? +

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

Can I rate-limit bases_upsert_config? +

Yes. Add a rate_limit block to the bases_upsert_config 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 bases_upsert_config completely? +

Set action: deny in the PolicyLayer policy for bases_upsert_config. 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 bases_upsert_config? +

bases_upsert_config is provided by the Optimike Obsidian MCP server (optimikelabs/optimike-obsidian-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Optimike Obsidian MCP tool call.

Start from Optimike Obsidian MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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