eo-toolbelt 0.1.3

Python SDK for EO Toolbelt built-in tools, MCP tools, and provider-native tool schemas

EO Toolbelt SDK

Korean documentation: README.ko.md

EO Toolbelt SDK helps Python applications expose utility tools, custom Python functions, and MCP server tools to model providers.

It gives you three small building blocks:

• list available tool specs
• execute a selected tool by name
• build provider-native tool option payloads for OpenAI, Anthropic, Gemini, and Bedrock Converse

The SDK does not call a language model for you. Your application keeps the model message loop and passes tool results back using the provider's normal API format.

Install

pip install eo-toolbelt

Import package:

from eo_toolbelt import Tools

Quick Start

import asyncio

from eo_toolbelt import Tools


async def main() -> None:
    tools = Tools()

    result = await tools.call_tool(
        "safe_calculate",
        {"expression": "(12 + 8) * 3"},
    )
    print(result)


asyncio.run(main())

Build Model Tool Options

from openai import AsyncOpenAI
from eo_toolbelt import Tools

client = AsyncOpenAI()
tools = Tools()

tool_options = await tools.model_tool_options(
    provider="openai",
    tool_names=["safe_calculate", "get_current_datetime"],
)

response = await client.responses.create(
    model="gpt-5",
    input="What is 12 * 8, and what time is it in Seoul?",
    **tool_options,
)

If the model returns a tool call, parse the provider response, call tools.call_tool(...), then send the tool result back to the model.

Tools Constructor

tools = Tools(
    config_path="mcp_servers.json",
    timeout_seconds=30,
    custom_tools=[my_custom_tool],
)

Option	Type	Description
config_path	`str	Path
timeout_seconds	`float	None`
custom_tools	iterable	Python callables or CustomTool objects registered on this instance.
backend	internal backend	Alternate runtime backend for tests and advanced embedding.

Main Methods

list_tools(...)

Returns canonical tool specs.

catalog = await tools.list_tools(
    include_internal=True,
    include_mcp=True,
    include_custom=True,
    mcp_server_names=["fetch"],
    selected_tool_names=["safe_calculate"],
)

call_tool(tool_name, arguments=None)

Executes one built-in, custom, or MCP tool.

result = await tools.call_tool(
    "safe_calculate",
    {"expression": "7 * 6"},
)

MCP tools use this name format:

mcp__{server_name}__{tool_name}

model_tool_options(provider, ...)

Converts tool specs into provider-native request fields.

tool_options = await tools.model_tool_options(
    provider="bedrock",
    tool_names=["safe_calculate"],
    tool_choice={"auto": {}},
)

Provider value	Returned fields
openai, gpt, openai_responses	OpenAI Responses API tools and optional tool_choice.
openai_chat_completions	OpenAI Chat Completions tools and optional tool_choice.
anthropic, claude	Anthropic Messages tools and optional tool_choice.
gemini	Gemini tools with function_declarations and optional tool_config.
bedrock, bedrock_converse	Bedrock Converse toolConfig.

select_tools(query, ...)

Selects a compact tool list from a catalog. Pass an LLM callback for model-judged selection, or omit llm for the deterministic keyword fallback.

tool_names = await tools.select_tools(
    query="Calculate actual vs budget variance by department.",
    max_tools=4,
    llm=select_with_llm,
)

Custom Tools

from typing import Literal

from eo_toolbelt import Tools, custom_tool


def apply_discount(amount: float, rate: float = 0.1) -> dict:
    """Apply a discount rate."""
    return {"amount": amount, "rate": rate, "total": amount * (1 - rate)}


@custom_tool(name="classify_priority")
def classify_priority(level: Literal["low", "high"]) -> str:
    """Classify a priority level."""
    return level.upper()


tools = Tools(custom_tools=[apply_discount, classify_priority])

MCP Config

Pass an MCP config file when your application wants to expose MCP server tools:

tools = Tools(config_path="mcp_servers.json")

An example config is available at examples/mcp_servers.example.json.

Environment variable placeholders use this form:

${ENV_NAME}
${ENV_NAME:-default}

Credential values can also be attached to a Tools instance:

tools.configure_integration(
    "github",
    {"access_token": "github_pat_..."},
)

Detailed Guides

The PyPI project description links to the repository documentation for the full service guide and tool catalog:

Document	Purpose
SDK usage guide	Detailed SDK options, provider values, selection modes, and examples.
SDK dependency guide	Fact-focused guide for including EO Toolbelt as a service dependency.
Tool catalog	Built-in tools, configured MCP servers, and common MCP tool ids.
Korean tool catalog	Korean tool catalog for built-in and MCP tools.

License

Distributed under the Apache License 2.0. See LICENSE.