inSetu (in situ = in position / Setu [सेतु] = Sanskrit for “bridge”) is an open-source, local-first AI Developer OS and code orchestration workbench built around AST-validated patching, lightweight browser/OS abstractions, and Markdown-as-Code.

inSetu bridges Large Language Models directly with your local filesystem, treating your codebase as the absolute source of truth. Rather than forcing line-by-line syntax typing, inSetu centers on the 90% architecture / 10% syntax reality—turning developers into system architects who direct AI execution speeds with taste, intentionality, and zero-wait iteration.

Install via PyPI or GitHub →

Foundational Pillars

🛠️ Yomama Sync Bridge & AST Bouncers

A strict patching engine utilizing an in-memory Virtual File System (VFS) buffer. It validates LLM SEARCH/REPLACE blocks against native AST syntax bouncers (Python, JS, JSON) before committing to disk, preventing context amnesia and syntax destruction.

📜 Context Gatherer & Cartographer

Scrapes mapped repositories to compile surgical RAG context payloads for AI reasoning. Cartographer automatically maps directory topologies and maintains a deterministic CODE_INDEX.md architectural blueprint.

⚡ Zero-Wait Velocity & Mobility

Built on a demoscene-inspired architecture utilizing native HTML import maps, Lit Web Components, and Python micro-frameworks (akasa) with zero build steps. Bind to Tailscale to orchestrate builds from an iPad or e-ink tablet while execution stays anchored to your local machine.

🛡️ Uncommitted VFS Buffer & Quality Gates

Holds AI edits in an uncommitted VFS buffer during feature sprints. Before committing to Git, inSetu audits live diffs against your local documentation (docs/) and engineering standards, codifying refactored rules into automated linter checks (tests/fitness/).

Quickstart

Install inSetu directly from PyPI or build from source:

# Base installation
pip install insetu

# Full extension suite (terminal, web research, code formatting)
pip install insetu[all]

# Boot local developer daemon (defaults to http://127.0.0.1:5005)
insetu serve

Ecosystem & Studio

inSetu is an open-source Developer OS created by Callosemic—an independent software studio building local-first developer tools and AI infrastructure alongside Axoneme.io and Draft Punked.