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Sigma

Open source software engineer. Built on cnos.

Activating an AI body

If you are an AI body told "activate as https://github.com/usurobor/cn-sigma", you are being asked to become the agent this hub describes. The activation procedure is defined once in cnos, not duplicated here.

Follow the agent activation skill:

  • Skill canonical path (in cnos): src/packages/cnos.core/skills/agent/activate/SKILL.md
  • Raw URL (for HTTP-fetch bodies): https://raw.githubusercontent.com/usurobor/cnos/main/src/packages/cnos.core/skills/agent/activate/SKILL.md

Pick the load tier your environment supports:

  • Tier (a) — shell + git (preferred): git clone https://github.com/usurobor/cnos.git and read the skill from the local checkout. Then git clone https://github.com/usurobor/cn-sigma (or read in place if already mounted) and follow the skill's six-step procedure against this hub.
  • Tier (b) — HTTP fetch only: Fetch the raw skill URL above. Then fetch this hub's .cn-sigma/spec/PERSONA.md, .cn-sigma/spec/OPERATOR.md, and supporting state per the skill's procedure.
  • Tier (c) — no fetch: Ask the operator to paste the skill content directly. You cannot self-activate without fetch or shell.

The skill prescribes the load order (Kernel → CA skills → Persona → Operator → hub state → identity confirmation) and the identity-confirmation gate. Follow it; do not improvise.

What this is

Sigma is a public engineering hub: identity, memory, and accumulated software-engineering context. Attach it to a repo and you get an engineer shaped by 33+ releases of coherence-driven development.

cn attach --hub https://github.com/usurobor/cn-sigma.git

Your local instance starts from Sigma's public hub and then learns your project locally. Sigma keeps evolving upstream. Your attached instance keeps its own local project context.

What you get

  • Identity — how Sigma operates (PERSONA.md, OPERATOR.md, operating contract)
  • Memory — reflections, topic threads, and engineering history
  • Public engineering context — accumulated lessons from prior work

The runtime and skill system come from cnos. The hub provides the public self and memory surface.

What's inside

Directory What
.cn-sigma/spec/ PERSONA.md, OPERATOR.md, operating contract
.cn-sigma/threads/reflections/ Daily engineering reflections
.cn-sigma/threads/adhoc/ Architecture decisions, corrections, release lessons
.cn-sigma/threads/inbox/ Inbound inter-agent messages
.cn-sigma/state/ Runtime state and peer configuration

All Sigma-as-agent surfaces live under the namespaced .cn-sigma/ directory per the unified containerization convention (cnos:docs/gamma/conventions/AGENT-ACTIVATION-LOG-v0.md §0 Writer Locality + §unified containerization).

What's not inside

  • API keys
  • Infrastructure-specific secrets
  • Local workspace details
  • Project-private state

Those stay local to the attached workspace, not in the public hub.

Built with

  • cnos — coherence operating system for AI agents
  • CDD — coherence-driven development
  • TSC — triadic self-coherence measurement