[BUG]

[mindthegaptutoring]

Bug Description

The edit-note tool fails with an "Invalid discriminator value" error regardless of which operation value is passed. The tool schema also returns empty properties {}, which prevents the tool from functioning. The create-note, delete-note, read-note, and search-vault tools all work correctly.

Environment

• OS: Windows 11
• Obsidian version: 1.12.7
• Claude Desktop version: Claude 1.5354.0 (9a9e3d) 2026-04-29T01:14:34.000Z)
• Plugin version: `-- obsidian-mcp@1.0.6
• Required plugins status:
  • Local REST API installed and configured

Steps to Reproduce

1. Install obsidian-mcp via npm and configure it as an MCP server in Claude Cowork
2. Call the edit-note tool with any valid operation value (append, prepend, replace, or delete)
3. Pass required parameters: vault name, filename, folder, operation, and content

Expected Behavior

The tool appends, prepends, replaces, or deletes content in the specified note.

Actual Behavior

The tool returns: MCP error -32602: Invalid arguments: Invalid discriminator value. Expected 'delete' | 'append' | 'prepend' | 'replace'

This occurs with all four operation values, including the ones listed in the error message itself. The tool schema returned to the client also shows empty properties {}, which means the calling agent cannot inspect valid parameter names or types.

Error Messages/Logs

MCP error -32602: Invalid arguments: Invalid discriminator value. Expected 'delete' | 'append' | 'prepend' | 'replace'

Additional Context

Updated to latest version via npm install -g obsidian-mcp@latest (updated 93 packages). The bug persists after the update and after restarting the client. As a workaround, delete-note followed by create-note achieves the same result but is significantly more expensive in terms of API tokens.

MCP server configuration:

{
  "obsidian": {
    "command": "C:\\Users\\krist\\AppData\\Roaming\\npm\\obsidian-mcp.cmd",
    "args": ["C:\\Users\\krist\\OneDrive\\Documents\\Obsidian Vault"]
  }
}

• Other plugins that might conflict
  -->

Troubleshooting Attempted

• Restarted Obsidian
• Restarted Claude Desktop
• Reinstalled the MCP server via plugin settings
• Checked Local REST API is running
• Other:

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Remember: This is volunteer work. Be patient and respectful. We'll help when we can.

[istefox]

Hi @mindthegaptutoring — heads-up that your repro body lists Plugin version: -- obsidian-mcp@1.0.6, which is a different plugin from this repo. obsidian-mcp-tools (here) and obsidian-mcp (the npm package) are unrelated projects with different tool surfaces — this repo doesn't have edit-note / create-note / read-note; the analogous tools are update_active_file, create_vault_file, get_vault_file. So this bug report is on the wrong tracker; you'd want to file it against the obsidian-mcp project itself.

If you're looking for a maintained MCP-for-Obsidian alternative with a similar surface: this repo's community fork is at istefox/obsidian-mcp-connector (0.4.0 released 2026-05-04 — HTTP transport, in-process server, no binary). Different tool names and response shapes from obsidian-mcp@1.0.6, but actively maintained per #79.