Runtime — SOFIA's first implementation uses Claude Code and CLAUDE.md files. The concepts described here (persona, isolation, artifacts) are provider-agnostic — only the runtime layer is specific to a provider. Some sections describe Claude Code specifics. Latter versions implement other providers.
What this layer contains How it connects to the other layers Porting to another provider

Provider — AI provider layer

The provider layer contains everything specific to the AI tool that runs the personas. Replace this layer to port SOFIA to another provider.

Current provider: Claude Code (Anthropic).

What this layer contains

File Role
sofia.md Sofia — the guide persona that creates and audits SOFIA instances
claude-code/ Claude Code implementation details

sofia.md

The guardian persona of the SOFIA method. Not a regular project persona — she is a meta-persona that guides instance creation, persona addition, recalibration, and audit. She operates on the method itself, not on a product.

4 operational modes:

  1. Create — design a new SOFIA instance (structure, conventions, personas)
  2. Add — add a persona to an existing instance
  3. Recalibrate — adjust an existing persona (wear signals, scope drift)
  4. Audit — structural compliance + friction diagnosis

claude-code/

Implementation details specific to the Claude Code runtime:

File Content
claude-md.md Anatomy of a CLAUDE.md — the 2-line routing file that connects a workspace to its persona and context
sessions.md Session summaries — format, workflow, opening/closing protocol
memory.md Persistent memory system — types (user, feedback, project, reference), what to store vs not
hooks.md Hooks — shell commands triggered by events, useful hooks for SOFIA, when not to use them

How it connects to the other layers

core/       ← principles, model, duties (provider-agnostic)
protocol/   ← H2A, friction, exchange, contribution (provider-agnostic)
binding/    ← filesystem materialization (provider-agnostic)
provider/   ← THIS LAYER (provider-specific)
canvas/     ← templates, patterns (provider-agnostic)

The provider layer is the only layer that changes when porting SOFIA to another AI tool. Core, protocol, binding, and canvas remain identical.

The CLAUDE.md pattern

The key provider mechanism is the CLAUDE.md file — a 2-line routing file placed at the root of each persona workspace:

Whatever the user's first message, before any response, read these two files:
- `../shared/orga/personas/persona-{name}.md`
- `../shared/orga/contextes/contexte-{name}-{product}.md`

This pattern is Claude Code-specific. Another provider would use its own injection mechanism (system prompt, config file, API parameter) to load the same persona + context files.

Porting to another provider

To port SOFIA to a different AI tool:

  1. Replace the routing mechanism (CLAUDE.md → provider equivalent)
  2. Adapt the session workflow (opening/closing/summary)
  3. Adapt persistent memory if available
  4. Keep everything else unchanged — personas, contexts, conventions, protocol