Redis MCP Server

Instructions

Implementation Reference

• src/tools/hash.py:121-146 (handler)

  The handler function for the 'set_vector_in_hash' MCP tool. It uses the @mcp.tool() decorator for registration and implements the logic to store a vector (converted to np.float32 binary blob) into a Redis hash field using hset.

  @mcp.tool()
  async def set_vector_in_hash(
      name: str, vector: List[float], vector_field: str = "vector"
  ) -> Union[bool, str]:
      """Store a vector as a field in a Redis hash.
  
      Args:
          name: The Redis hash key.
          vector_field: The field name inside the hash. Unless specifically required, use the default field name
          vector: The vector (list of numbers) to store in the hash.
  
      Returns:
          True if the vector was successfully stored, False otherwise.
      """
      try:
          r = RedisConnectionManager.get_connection()
  
          # Convert the vector to a NumPy array, then to a binary blob using np.float32
          vector_array = np.array(vector, dtype=np.float32)
          binary_blob = vector_array.tobytes()
  
          r.hset(name, vector_field, binary_blob)
          return True
      except RedisError as e:
          return f"Error storing vector in hash '{name}' with field '{vector_field}': {str(e)}"