`dsh` shipped two config trees that were 43 rows the same: apps/cli/cordis.yml composed web as 74 flat rows, while the TUI booted examples/tui-agent/cordis.yml whose single `@deepseek-ai/dsh-tui-demo` row mounted twelve plugins behind a twenty-key pass-through Config. Neither file was what its location claimed — apps/cli hardcoded the "example" as the product default and the "demo" bundle was the application — and every capability change had to be made twice. - apps/cli/base.cordis.yml holds the 43 shared rows; tui.cordis.yml and web.cordis.yml are patch lists stating only what differs per surface - overlays apply as SIBLING patch lists at one include level, because include patches never cross an include boundary. Precedence: base < surface < (--config | personal ~/.dsh/config.yaml) < launcher flag/profile patches - `--config` now applies an overlay INSTEAD OF the personal one, so a demo or test tree never inherits the user's route; new `--config-replace` boots a file as the entire tree (the old `--config` behaviour). Both survive /resume - vendor/include: index each `insert`ed row as it is added so a later patch can configure or disable it. Upstream built the id index once before the patch loop, leaving every surface-only row — the whole TUI front door — silently unpatchable from user config. Logged as local modification 8 - session identity moves to dsh-agent-loop's CONFIGURED_AGENT_IDENTITIES_KEY; dsh-tui's MAIN_SESSION_ID_KEY is deleted (only the bundle read it) - delete examples/tui-agent, examples/cordis-agent, packages/examples/tui-demo; TUI tests → apps/cli/tests, cordis e2e → packages/cordis/tool-cordis/tests, examples/code-mode survives as an overlay leaf - `dsh web` gains --config, threaded into AppCLIEntry as an extra overlay Three latent defects surfaced and are fixed here: the TUI captured the optional sessionQuery service once at construction and could permanently disable /resume when it won the mount race; the session-store root silently reverted to a project-local ./.sessions; --config-replace was dropped by the resume handoff. Verified by booting each tree through the real Loader (TUI 55 entries, web 75, zero unsettled) rather than reading YAML. All eight terminal snapshots replay byte-identically; 14/14 PTY smoke, 112/112 snapshots, 25/25 doc-sync, hygiene and lint clean.
core/ — product API spine
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The session log, system-prompt assembly, tool registry, agent vocabulary, and concrete loop that form the harness's default control spine. These are product packages — the stable surface plugins and consumers build against.
| Package | Role | ctx key |
|---|---|---|
scope/ |
Scoped-context registration primitive (scope tags, scope-filtered dispatch) | (library — no ctx key) |
session/ |
Event-sourced session log + in-memory store | ctx.sessions |
system-prompt/ |
Prompt-section + tool-schema assembly registry | ctx.systemPrompt |
tools/ |
Scoped tool registry + pre-policy, guards, around-dispatch, post-policy, and final-result observation | ctx.tools |
agent/ |
Agent interface, live registry, process-local initiator scope, agent/* event vocabulary |
ctx.agents |
agent-loop/ |
Concrete plugin implementing the public Agent contract and owning the loop driver |
ctx.agentLoop |
scope/ is the one non-service package here: a dependency-free library (createScope/scopeOf/scopeTarget) the registries and the loop build per-agent scoping on — it sits below session/ and system-prompt/ in the module graph precisely so they can consume it without a cycle.
agent-loop is the one concrete implementation of the agent seam and lives here because it is the harness's default product loop. It runs each driver inside ctx.agents.withInitiator(). Extension plugins depend on agent, including when they need the initiating Agent, and never on agent-loop directly, so the loop stays swappable.
The default composition that wires this spine into a runnable agent lives in examples/agent-spine-demo: one bundle plugin that loads the control spine plus selected default capabilities (timer + llm + sessions + fallback session titles + system-prompt + tools + agents + invariants + the local skill family + tool-bash + workspace-context + agent-loop) and forwards agent-loop's agents list as its own config. It sits in examples/ — ready-to-run demo/reference bundles — not in core/: core/ ships the swappable spine pieces, while a demo bundle picks one concrete composition of them and adds a front door.