MCP Tool: Appends content to a daily note (date optional, defaults today).
AI agents use append_to_daily_note to create or update resources in Obsidian MCP Tool Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Obsidian MCP Tool Server environment.
This tool adds content to an existing daily note, which is a reversible write operation. It modifies data but does not delete or overwrite existing content irreversibly. Severity is medium because an AI agent could append unwanted or malicious content to daily notes, but the damage is limited in scope and reversible.
From the tool's definition Appends content to a daily note (date optional, defaults today)
Documented attack patterns abuse exactly the kind of access append_to_daily_note gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Obsidian MCP Tool Server, and nothing reaches the server without passing your rules. This is the rule we recommend for append_to_daily_note:
{
"version": "1",
"default": "deny",
"tools": {
"append_to_daily_note": {
"limits": [
{
"counter": "append_to_daily_note_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}append_to_daily_note 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.
MCP Tool: Appends content to a daily note (date optional, defaults today). It is categorised as a Write tool in the Obsidian MCP Tool Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Obsidian MCP Tool Server MCP server in PolicyLayer and add a rule for append_to_daily_note: 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 Tool Server. Nothing to install.
append_to_daily_note 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 append_to_daily_note 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 append_to_daily_note. 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.
append_to_daily_note is provided by the Obsidian MCP Tool Server MCP server (rwb3n/obsidian-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 18 Obsidian MCP Tool Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
18 Obsidian MCP Tool Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.