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Obsidian MCP Server

Obsidian MCP Server

by cupkappu
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
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create_or_update_file

Create or update an Obsidian note by providing a file path and content, enabling direct file manipulation within the vault.

Instructions

Create a new file or update an existing one

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "filename": "<filename>",
      "content": "<content>"
    },
    "name": "create_or_update_file"
  }
}

Input Schema

NameRequiredDescriptionDefault
contentYesFile content
filenameYesPath to the file relative to vault root

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.2/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states the basic action and omits critical traits such as whether updates overwrite the entire file, whether directories are created, or any error semantics. This is insufficient for a mutation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence that directly states the tool's function without filler or redundancy. Every word contributes to the core message, making it highly concise and well-structured.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Although the tool is simple with only two well-documented parameters, the description lacks essential behavior like overwrite semantics and fails to clarify the difference between 'update' and append operations. It leaves important trust and safety questions unanswered, so it is not complete enough for reliable use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema provides descriptions for both parameters (filename and content), achieving 100% coverage. The description itself adds no extra parameter context, but the schema already documents the meaning of each parameter, warranting the baseline score of 3.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses specific verbs 'create' and 'update' with the resource 'file', clearly indicating the tool's dual purpose. It distinguishes from sibling tools like delete_file and append_to_file by implying full-content replacement on update, making the tool's scope unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool versus alternatives like append_to_file or update_active_file. The description does not explicitly state that update overwrites existing content or provide any decision rules, leaving the choice to the agent's inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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