Save a summary of an AI coding thread to Obsidian
AI agents use save_thread_summary 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.
This tool writes data to the knowledge base (creates/modifies a note), which is a reversible operation. It does not delete, execute code, trigger external operations, or move money. The severity is medium because unauthorized saves could pollute the vault with incorrect summaries or sensitive information, but the effect is reversible by deletion or editing.
From the tool's definition Tool name 'save_thread_summary' and description 'Save a summary of an AI coding thread to Obsidian' indicate the tool creates or modifies data by persisting a summary to a note in an Obsidian vault.
Documented attack patterns abuse exactly the kind of access save_thread_summary gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Obsidian MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for save_thread_summary:
{
"version": "1",
"default": "deny",
"tools": {
"save_thread_summary": {
"limits": [
{
"counter": "save_thread_summary_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}save_thread_summary 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.
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Save a summary of an AI coding thread to Obsidian. 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.
Register the Obsidian MCP Server MCP server in PolicyLayer and add a rule for save_thread_summary: 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.
save_thread_summary 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 save_thread_summary 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 save_thread_summary. 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.
save_thread_summary is provided by the Obsidian MCP Server MCP server (kynlos/obsidian-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Obsidian MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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120 Obsidian MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.