langchain-textual 0.1.1

LangChain integration for Tonic Textual PII redaction

langchain-textual

PII redaction tools for LangChain, powered by Tonic Textual.

Strip names, emails, addresses, and other sensitive data from text, JSON, HTML, and files before they hit your LLM — or on the way back out. Drop them into any LangChain chain or agent as standard tools.

Installation

pip install langchain-textual

Quick start

export TONIC_TEXTUAL_API_KEY="your-api-key"

from langchain_textual import TonicTextualRedactText

tool = TonicTextualRedactText()
tool.invoke("My name is John Smith and my email is [e-mail].")
# "My name is [NAME_GIVEN_xxxx] [NAME_FAMILY_xxxx] and my email is [EMAIL_ADDRESS_xxxx]."

Tools

Tool	Input	Use for
TonicTextualRedactText	Plain text string	Raw text, .txt file contents
TonicTextualRedactJson	JSON string	Raw JSON, .json file contents
TonicTextualRedactHtml	HTML string	Raw HTML, .html/.htm file contents
TonicTextualRedactFile	File path	PDFs, images (JPG, PNG), CSVs, TSVs
TonicTextualPiiTypes	None	List all supported PII entity types

Text

from langchain_textual import TonicTextualRedactText

tool = TonicTextualRedactText()
tool.invoke("My name is John Smith and my email is [e-mail].")
# "My name is [NAME_GIVEN_xxxx] [NAME_FAMILY_xxxx] and my email is [EMAIL_ADDRESS_xxxx]."

JSON

from langchain_textual import TonicTextualRedactJson

tool = TonicTextualRedactJson()
tool.invoke('{"name": "John Smith", "email": "[e-mail]"}')
# '{"name": "[NAME_GIVEN_xxxx] [NAME_FAMILY_xxxx]", "email": "[EMAIL_ADDRESS_xxxx]"}'

HTML

from langchain_textual import TonicTextualRedactHtml

tool = TonicTextualRedactHtml()
tool.invoke("<p>Contact John Smith at [e-mail]</p>")
# "<p>Contact [NAME_GIVEN_xxxx] [NAME_FAMILY_xxxx] at [EMAIL_ADDRESS_xxxx]</p>"

Files

from langchain_textual import TonicTextualRedactFile

tool = TonicTextualRedactFile()
tool.invoke({"file_path": "/path/to/scan.pdf"})
# "/path/to/scan_redacted.pdf"

tool.invoke({"file_path": "/path/to/photo.jpg", "output_path": "/tmp/redacted.jpg"})
# "/tmp/redacted.jpg"

For .txt, .json, and .html/.htm files, read the file contents and pass them to the corresponding text, JSON, or HTML tool instead.

Configuration

All tools share the same configuration options.

Synthesis mode — replace PII with realistic fake data instead of placeholders:

tool = TonicTextualRedactText(generator_default="Synthesis")
tool.invoke("Contact Jane Doe at [e-mail].")
# "Contact Maria Chen at [e-mail]."

Per-entity control — set handling per PII type with generator_config:

tool = TonicTextualRedactText(
    generator_default="Off",
    generator_config={
        "NAME_GIVEN": "Synthesis",
        "NAME_FAMILY": "Synthesis",
        "EMAIL_ADDRESS": "Redaction",
    },
)
tool.invoke("Contact Jane Doe at [e-mail].")
# "Contact Maria Chen at chen@[EMAIL_ADDRESS_xxxx]."

Use TonicTextualPiiTypes to list all supported entity type names:

from langchain_textual import TonicTextualPiiTypes

TonicTextualPiiTypes().invoke("")
# "NUMERIC_VALUE, LANGUAGE, MONEY, ..., EMAIL_ADDRESS, NAME_GIVEN, NAME_FAMILY, ..."

Self-hosted deployment:

tool = TonicTextualRedactText(tonic_textual_base_url="https://textual.your-company.com")

Explicit API key (instead of env var):

tool = TonicTextualRedactText(tonic_textual_api_key="your-api-key")

Using with a LangChain agent

Every tool in this package is a standard LangChain tool, so they work anywhere tools do. Give your agent whichever combination it needs:

from langchain_textual import (
    TonicTextualRedactText,
    TonicTextualRedactJson,
    TonicTextualRedactFile,
)
from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent

llm = ChatOpenAI(model="gpt-4o-mini")
tools = [TonicTextualRedactText(), TonicTextualRedactJson(), TonicTextualRedactFile()]
agent = create_react_agent(llm, tools)

Development

# install dependencies
uv sync --group dev --group test --group lint --group typing

# install pre-commit hooks (auto-runs ruff on each commit)
uv tool install pre-commit
pre-commit install

# run unit tests
make test

# run integration tests (requires TONIC_TEXTUAL_API_KEY)
make integration_tests

# lint & format
make lint
make format

License

MIT