---
title: "Return the unified diff (and raw remote text) of a vault file. Useful for surfacing what `sync_merge` would conflict on, or for the client to render a `git diff` view before pushing. NO database mutation. Server has no history — base_text must be supplied by the caller if a 3-way view is needed; otherwise this returns remote_text only."
method: POST
path: "/api/mcp/tools/sync_diff"
tags: ["sync"]
---

# Return the unified diff (and raw remote text) of a vault file. Useful for surfacing what \`sync_merge\` would conflict on, or for the client to render a \`git diff\` view before pushing. NO database mutation. Server has no history — base_text must be supplied by the caller if a 3-way view is needed; otherwise this returns remote_text only.

`POST /api/mcp/tools/sync_diff`

## Request

- Base URL: `https://api.ainote.dev`
- URL: `https://api.ainote.dev/api/mcp/tools/sync_diff`
- Auth: API key in header `Authorization`

Return the unified diff (and raw remote text) of a vault file. Useful for surfacing what `sync_merge` would conflict on, or for the client to render a `git diff` view before pushing. NO database mutation. Server has no history — base_text must be supplied by the caller if a 3-way view is needed; otherwise this returns remote_text only.

## Request body

- object
  - `path` string, required: Relative vault path.
  - `local_text` string: Optional: client's current text. When supplied, response includes unified diff (remote → local).
  - `base_text` string: Optional: client's baseline (last-known remote). When supplied along with local_text, response includes both diffs (base → remote, base → local) so the client can render a 3-way view.

## Response `200`

Tool executed successfully

- ToolSuccessResponse: Successful tool invocation. `content` mirrors the MCP `tools/call` result shape: an array of content blocks (text and optionally a structured resource payload).
  - `content` object[]
    - `type` 'text' | 'resource'
    - `text` string

## Other responses

- `400`: Invalid arguments or business-rule violation
- `401`: Missing or invalid McpKey

---

[API](https://skmtc.dev/ainote/apis/ainote-mcp-openapi-mirror.md) · [All operations](https://skmtc.dev/ainote/apis/ainote-mcp-openapi-mirror/llms.txt) · [OpenAPI document](https://skmtc.dev/ainote/apis/ainote-mcp-openapi-mirror/revisions/f6c91d85e027?raw)