ape-langchain 0.1.2

LangChain integration layer for the Ape AI-first programming language

ape-langchain

LangChain integration layer for the Ape AI-first programming language

What is this?

ape-langchain bridges the Ape programming language with LangChain, enabling you to:

• Use Ape tasks as LangChain tools with deterministic execution
• Eliminate AI hallucination in tool invocation through strict validation
• Build reliable AI agents with formally defined, constraint-validated workflows

Ape is a deterministic AI-first language designed to remove ambiguity from AI-generated code. ape-langchain makes Ape tasks seamlessly callable from LangChain agents.

Installation

pip install ape-langchain

This will automatically install ape-lang and langchain as dependencies.

Quick Start

1. Write an Ape Task

Create pricing.ape:

task calculate_total_price
  inputs:
    base_price: String
    tax_rate: String
  outputs:
    total: String
  constraints:
    - base_price must be numeric
    - tax_rate must be between 0 and 1
  steps:
    - Parse base_price as decimal
    - Multiply by (1 + tax_rate)
    - Return as string

2. Use it in LangChain

from ape_langchain import ApeTool
from langchain.agents import initialize_agent, AgentType
from langchain.llms import OpenAI

# Wrap Ape task as LangChain tool
pricing_tool = ApeTool(
    ape_file="pricing.ape",
    function="calculate_total_price",
    description="Calculate total price with tax"
)

# Create agent with deterministic tool
llm = OpenAI(temperature=0)
agent = initialize_agent(
    tools=[pricing_tool],
    llm=llm,
    agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION,
    verbose=True
)

# Execute - AI decides when to call, but execution is deterministic
result = agent.run("What's the total for $99.99 with 21% tax?")
print(result)

3. Or Use ApeChain Directly

For simpler workflows without full agent orchestration:

from ape_langchain import ApeChain

chain = ApeChain.from_ape_file("pricing.ape", function="calculate_total_price")

result = chain.run(base_price="99.99", tax_rate="0.21")
print(result)  # Deterministic, validated output

Why Use This?

Problem: AI Tool Invocation is Unreliable

# Traditional approach - AI can hallucinate parameters, miss constraints
def calculate_price(base, tax):
    return base * (1 + tax)  # What if base is negative? What if tax > 1?

Solution: Ape + LangChain

# Ape approach - constraints enforced, no ambiguity
pricing_tool = ApeTool("pricing.ape", "calculate_total_price")
# - Input validation automatic
# - Constraints checked before execution
# - No hallucination possible

API Overview

ApeTool

LangChain BaseTool adapter for Ape tasks.

from ape_langchain import ApeTool

tool = ApeTool(
    ape_file="path/to/module.ape",
    function="task_name",
    description="Optional description for LLM"
)

# Use in LangChain agents
agent = initialize_agent(tools=[tool], llm=llm, ...)

ApeChain

High-level wrapper for direct execution.

from ape_langchain import ApeChain

chain = ApeChain.from_ape_file("module.ape", function="task_name")
result = chain.run(param1="value", param2="value")

ApeTask

Low-level task representation with JSON Schema export.

from ape_langchain import ApeTask
from ape import compile

module = compile("module.ape")
task = ApeTask.from_module(module, "task_name")

# Get JSON Schema for OpenAI/Anthropic function calling
schema = task.to_json_schema()

Features

• ✅ Deterministic execution - Ape constraints prevent invalid inputs
• ✅ Type-safe - Full type checking before execution
• ✅ LangChain native - Works with all LangChain agent types
• ✅ JSON Schema export - Compatible with OpenAI/Anthropic function calling
• ✅ Error handling - Clear exception types for debugging

Requirements

• Python 3.11+
• ape-lang >=0.2.0
• langchain >=0.1.0

Development Status

v0.1.0 - Initial release

Currently supports:

• Basic Ape task wrapping
• LangChain tool integration
• Simple type mapping (all parameters as strings for now)

Roadmap:

• Advanced type system (int, float, list, dict)
• Async execution support
• Multi-task orchestration
• Native Ape control flow support

Contributing

Contributions welcome! See the main Ape repository for guidelines.

License

MIT License - see LICENSE file for details.

Links

• Ape Language
• LangChain
• Documentation

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Built with Ape 🦍 - Because AI should execute deterministically, not approximately.