redline

Targeted, exact document edits for AI agents - no full-document rewrites.

Install

pip install py-redline
pip install "py-redline[pydantic-ai]"   # optional, for the pydantic-ai wrapper

Usage

from redline import Document, apply_edit, read

doc = Document("# Todo\n- buy milk\n")
apply_edit(doc, "buy milk", "buy oat milk")
print(read(doc))

Document holds the text. apply_edit finds old_str and swaps in new_str - it must match exactly once, unless allow_multiple=True. Other tools: read_lines, append, undo.

With pydantic-ai

from pydantic_ai import Agent
from redline import Document
from redline.pydantic_ai import TOOLS

doc = Document(your_text)
agent = Agent("your-model", deps_type=Document, tools=TOOLS)
agent.run_sync("fix the typo in the intro", deps=doc)
print(doc.text)

TOOLS includes everything. For a session that should only ever read, use READ_TOOLS instead - WRITE_TOOLS holds the tools that can change the document.

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