obsidian_append_content · Obsidian MCP Server MCP

WHAT IT DOES

What obsidian_append_content does on Obsidian MCP Server

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

WHY IT NEEDS A POLICY

Why obsidian_append_content needs a policy

The name 'append_content' strongly suggests adding data to a file. In the context of an Obsidian MCP server managing vault notes, this is a Write operation. Appending is generally reversible (content can be removed). Severity is medium since misuse could pollute notes at scale. Confidence is reduced due to the empty description.

From the tool's definition Tool name: obsidian_append_content — 'append' implies adding content to an existing file without overwriting, a reversible write operation. Description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

obsidian_append_content Rate-limited

obsidian_append_content 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": {
    "obsidian_append_content": {
      "limits": [
        {
          "counter": "obsidian_append_content_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about obsidian_append_content

What does the obsidian_append_content tool do? +

obsidian_append_content. It is categorised as a Write tool in the Obsidian MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on obsidian_append_content? +

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

What risk level is obsidian_append_content? +

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

Can I rate-limit obsidian_append_content? +

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

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

obsidian_append_content is provided by the Obsidian MCP Server MCP server (shepherd-creative/obsidian-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.