Advanced Obsidian MCP Server

Instructions

Implementation Reference

• src/mcp_obsidian_advanced/tools.py:108-141 (handler)

  The run_tool method in SearchToolHandler class that implements the core logic of the obsidian_simple_search tool: validates input, calls the Obsidian API search, formats the results with context and match positions, and returns as JSON.

  def run_tool(self, args: dict) -> Sequence[TextContent | ImageContent | EmbeddedResource]:
      if "query" not in args:
          raise RuntimeError("query argument missing in arguments")
  
      context_length = args.get("context_length", 100)
      
      results = api.search(args["query"], context_length)
      
      formatted_results = []
      for result in results:
          formatted_matches = []
          for match in result.get('matches', []):
              context = match.get('context', '')
              match_pos = match.get('match', {})
              start = match_pos.get('start', 0)
              end = match_pos.get('end', 0)
              
              formatted_matches.append({
                  'context': context,
                  'match_position': {'start': start, 'end': end}
              })
              
          formatted_results.append({
              'filename': result.get('filename', ''),
              'score': result.get('score', 0),
              'matches': formatted_matches
          })
  
      return [
          TextContent(
              type="text",
              text=json.dumps(formatted_results, indent=2)
          )
      ]

• src/mcp_obsidian_advanced/tools.py:86-106 (schema)

  The get_tool_description method defining the input schema and description for the obsidian_simple_search tool.

  def get_tool_description(self):
      return Tool(
          name=self.name,
          description="""Simple search for documents matching a specified text query across all files in the vault. 
          Use this tool when you want to do a simple text search""",
          inputSchema={
              "type": "object",
              "properties": {
                  "query": {
                      "type": "string",
                      "description": "Text to a simple search for in the vault."
                  },
                  "context_length": {
                      "type": "integer",
                      "description": "How much context to return around the matching string (default: 300)",
                      "default": 300
                  }
              },
              "required": ["query"]
          }
      )

• src/mcp_obsidian_advanced/server.py:26-43 (registration)

  TOOL_MAPPING dictionary maps the tool name 'obsidian_simple_search' (via tools.TOOL_SIMPLE_SEARCH) to its handler class SearchToolHandler, used in register_tools() to instantiate and register the tool with the MCP server.

  TOOL_MAPPING = {
      tools.TOOL_LIST_FILES_IN_DIR: tools.ListFilesInDirToolHandler,
      tools.TOOL_SIMPLE_SEARCH: tools.SearchToolHandler,
      tools.TOOL_PATCH_CONTENT: tools.PatchContentToolHandler,
      tools.TOOL_PUT_CONTENT: tools.PutContentToolHandler,
      tools.TOOL_APPEND_CONTENT: tools.AppendContentToolHandler,
      tools.TOOL_DELETE_FILE: tools.DeleteFileToolHandler,
      tools.TOOL_COMPLEX_SEARCH: tools.ComplexSearchToolHandler,
      tools.TOOL_BATCH_GET_FILES: tools.BatchGetFilesToolHandler,
      tools.TOOL_PERIODIC_NOTES: tools.PeriodicNotesToolHandler,
      tools.TOOL_RECENT_PERIODIC_NOTES: tools.RecentPeriodicNotesToolHandler,
      tools.TOOL_RECENT_CHANGES: tools.RecentChangesToolHandler,
      tools.TOOL_UNDERSTAND_VAULT: tools.UnderstandVaultToolHandler,
      tools.TOOL_GET_ACTIVE_NOTE: tools.GetActiveNoteToolHandler,
      tools.TOOL_OPEN_FILES: tools.OpenFilesToolHandler,
      tools.TOOL_LIST_COMMANDS: tools.ListCommandsToolHandler,
      tools.TOOL_EXECUTE_COMMANDS: tools.ExecuteCommandsToolHandler,
  }

• src/mcp_obsidian_advanced/server.py:95-108 (registration)

  register_tools() function instantiates handlers from TOOL_MAPPING (conditionally based on INCLUDE_TOOLS env var) and adds them to tool_handlers dict, making them available via @app.list_tools() and @app.call_tool().

  def register_tools():
      """Register the selected tools with the server."""
      tools_to_include = parse_include_tools()
      
      registered_count = 0
      for tool_name in tools_to_include:
          if tool_name in TOOL_MAPPING:
              handler_class = TOOL_MAPPING[tool_name]
              handler_instance = handler_class()
              add_tool_handler(handler_instance)
              registered_count += 1
              logger.debug(f"Registered tool: {tool_name}")
      
      logger.info(f"Successfully registered {registered_count} tools")

• src/mcp_obsidian_advanced/tools.py:82-84 (helper)

  SearchToolHandler class definition and __init__ that sets the tool name to 'obsidian_simple_search'.

  class SearchToolHandler(ToolHandler):
      def __init__(self):
          super().__init__(TOOL_SIMPLE_SEARCH)