git:20260905.f582517 to git:20260905.848dd6d

54 added, 241 removed. Audit A to A.

# AGENTS.md - apps/canvas-workspace

- > Local entry for `apps/canvas-workspace`.

- > Repository harness entry: `../../harness/README.md`.

- > `CLAUDE.md` is a thin import shell of this file — edit here, never both.

- ## Module Positioning

+ Local router for Pulse Canvas. Read root AGENTS and harness/README.md first. CLAUDE.md is a thin import shell; edit this file.

- `canvas-workspace` owns the Pulse Canvas Electron workbench: the desktop shell,

- React renderer, preload bridge, canvas persistence and migration, Canvas Agent

- chat, agent-team flows, plugin loading, embedded webviews, terminal/agent PTYs,

- artifacts, settings, local runtime-control server, and app-specific harness.

+ ## Role and ownership

- This is an active pnpm app workspace. It consumes `pulse-coder-engine` and

- `pulse-coder-agent-teams`, interoperates with `@pulse-coder/canvas-cli` through

- the canvas store and runtime-control server, and hosts external node plugins

- through manifests and plugin registries (runtime-loadable plugin dirs; the

- former in-repo example `packages/canvas-nodes` was removed in the 2026-08

- slim-down — see tag `pre-slim-archive` for a reference implementation).

+ This active pnpm workspace owns the Electron shell, React renderer, preload bridge, canvas persistence/migration, Canvas Agent chat, agent teams, plugins, webviews, terminal/agent PTYs, artifacts, settings, and runtime-control server. It consumes engine/agent-teams and interoperates with canvas-cli through storage and runtime capabilities.

- Keep this file as the local router. Put durable implementation detail in

- existing workspace docs or tests. Add new workspace docs only when a behavior

- or operating runbook needs a durable source of truth.

+ The app owns migrations, PTYs, plugin activation, runtime endpoints, and UI-visible recovery; the CLI adapts. External plugin-node history and examples belong to plugin-node-mf2.md.

- **Local harness layout** — `harness/` is this workspace's repo-harness

- container, aligned with `packages/engine/harness/`:

- - `harness/knowledge/` — per-topic knowledge files, routed in the Knowledge

- Navigation table below (`docs/` keeps only project records like perf

- analyses and roadmaps).

- - `harness/tools/driver/` — the headless-Electron driver (launch profiles,

- CDP, screenshots, logs). It is BOTH the repo-harness Tool face and a

- product-operation CLI; `pnpm --filter canvas-workspace harness <cmd>`

- still points at it.

- - `harness/tools/describe-canvas.mjs` — static structure snapshot: agent-tool

- registry, IPC handle↔invoke contract diff, node-type union↔factory

- sync, and app↔canvas-cli parity (NodeType union subset + storage

- schema-version constants). Run before touching any of those registries;

- exits non-zero on a broken invoke, union/factory drift, a CLI-only node

- type, an unallowlisted app-only type, or a schema-version mismatch.

- - `harness/tools/ui-showcase/` — Playwright screenshot baseline for

- `components/ui/` (the blessed design-system set): a plain-React vite page

- (zero Electron/preload imports) mounting every `ui/` piece in its

- meaningful variants/states, plus the one Playwright spec that captures

- and compares against committed baselines. `pnpm run visual` /

- `visual:update` from this package; Linux-rendered baselines only (fonts

- differ per OS) — see `harness/tools/ui-showcase/README.md`. Built as the

- prerequisite for `docs/ui-reuse-burndown.md`'s Batch C3.

- - `harness/skills/` — SKILL.md procedures for coding agents operating this

- app: `canvas-harness`, `canvas-onboard-harness` (drive the real app),

- `diagnose-agent-latency` (trace and optimize Agent turn latency),

- `validate-canvas-change` (choose quick/standard/release evidence),

- `check-renderer-structure` (audit renderer directory/module health),

- `add-canvas-node`, `add-agent-tool`, `add-builtin-main-plugin`,

- `extend-blessed-ui`, `add-ipc-surface` (safe-change procedures for the

- five recurring extension shapes).

- - `harness/spec/` — decision-pending intent; empty is the success state. Surface definition: ../../packages/engine/harness/spec/README.md; resolved entries end as tests/skills, then delete.

- - `harness/validate/validation.yaml` — path→check bindings for the repo runner.

+ harness/ is the repo container for Knowledge, Tools, Validate, Skills, and optional Spec. The driver is also a product-operation CLI. Repo action skills are distinct from src/main/agent/skills runtime features and the externally installed pulse-canvas skills. Existing docs/ holds project records.

- **"skills" disambiguation** — `harness/skills/*/SKILL.md` are procedures for

- CODING agents working on this app; `src/main/agent/skills/` is the PRODUCT

- runtime-skills feature of the in-app Canvas Agent; `files/skill-installer.ts`

- deploys the external-agent `pulse-canvas` CLI + bundled skills. Do not mix them.

+ ## Required task routes

- ## Knowledge Navigation

+ A matching trigger requires reading its owner before changing code. Keep detailed mechanisms and test inventories there.

- | Task | Read |

+ | Change / task | Required resource |

|---|---|

- | Repository harness and root validation | `../../harness/README.md`, `../../harness/validate/validation.yaml` |

- | App overview | `README.md` |

- | Drive the real app (launch/CDP/screenshot) | `harness/tools/driver/README.md`, `harness/skills/canvas-harness/SKILL.md`, `harness/skills/canvas-onboard-harness/SKILL.md`; what "correct" looks like: `harness/knowledge/renderer-surfaces.md` |

- | Security posture, agent execution reach, disk/config surfaces | `harness/knowledge/security-posture.md` |

- | Confirmed-but-unfixed defects | `harness/knowledge/known-defects.md` |

- | Main/renderer/preload boundaries | `harness/knowledge/conventions/README.md`, `harness/knowledge/conventions/architecture-boundaries.md` |

- | Renderer conventions | `harness/knowledge/conventions/frontend.md` |

- | Renderer current→module-first architecture and directory health | `harness/spec/renderer-modules/README.md`; run `harness/skills/check-renderer-structure/SKILL.md` |

- | Main-process conventions | `harness/knowledge/conventions/backend.md` |

- | PATH for anything the app spawns | `src/main/shell-path.ts` — a GUI launch inherits a stripped PATH, and every child (agent `bash`, which the engine spawns with NO `env`, MCP stdio servers, the bundled CLI) takes `process.env` verbatim, so a missing binary surfaces as a bare "command not found". Repaired once in `bootstrap.ts` before any spawn: `augmentProcessPath()` (sync, well-known per-user bin dirs incl. `~/.pulse-coder/bin`) then a best-effort `applyLoginShellPath()` (async, timeout-bounded `$SHELL -ilc`, only ever widens). PTY env shares the same bin-dir list — do not fork a second copy. Tests: `src/main/__tests__/shell-path.test.ts` |

- | Main domain map | `harness/knowledge/main-domain-modules.md`, `src/main/index.ts`, `src/main/app/bootstrap.ts` |

- | Renderer routes and full-app surfaces | `harness/knowledge/renderer-surfaces.md`, `src/renderer/src/app/App/`, `src/renderer/src/app/shell/Workbench/`, `src/renderer/src/modules/dock/internal/RightDock/` |

- | Keyboard shortcuts | Read `harness/knowledge/keyboard-shortcuts.md` before adding/changing/removing a shortcut, editing `menu.ts` accelerators, or touching webview/terminal key handling. Key contracts: `shortcuts/definitions.ts`, `shortcuts/registry.ts`, `modules/canvas/runtime/useCanvasKeyboard.ts`, `app/shortcuts/useAppShortcuts.ts`, `src/main/app/menu.ts`, `src/shared/webview-shortcuts.ts`. Bound tests (`keyboard-shortcuts` rule, `harness/validate/validation.yaml`): `shortcuts/registry.test.ts`, `modules/canvas/runtime/useCanvasKeyboard.test.ts`, `app/shortcuts/useAppShortcuts.test.ts`, `src/main/webview/__tests__/shortcut-forwarding.test.ts`, `AgentNodeBody/utils/terminalKeys.test.ts`, `AgentNodeBody/utils/terminalFocus.test.ts`, `shortcuts/terminalShortcuts.test.ts`. |

- | Cross-process API bridge | `src/preload/index.ts`, `src/preload/bridge/`, `src/renderer/src/types.ts`, `src/shared/` |

- | Add a capability spanning main + preload + renderer | `harness/skills/add-ipc-surface/SKILL.md` (ordered procedure — contract placement, streaming pattern, bootstrap wire, lockstep rule) |

- | Canvas node/edge schema | `src/shared/canvas.ts` |

- | Add a new canvas node capability | `harness/skills/add-canvas-node/SKILL.md` (ordered procedure — plugin is the default path, host type is the exception); background: `harness/knowledge/plugin-node-mf2.md` (plugin path), `src/shared/canvas.ts`, `src/renderer/src/utils/nodeFactory.ts`, `src/renderer/src/modules/canvas/components/canvas/CanvasNodeView/` (host-type touch points) |

- | Current registries (agent tools / IPC pairs / node types) | run `node harness/tools/describe-canvas.mjs` (from this dir; `--json` for machines) |

- | Visual-regression baseline for ui/ pieces | `harness/tools/ui-showcase/README.md`; run `pnpm run visual` / `pnpm run visual:update` |

- | Canvas persistence and migration | `src/main/canvas/store.ts`, `src/main/canvas/storage.ts`, `src/main/canvas/nodes/` (NB: `nodes/` here = knowledge-node records + tags, NOT node types) |

- | Node Detail (knowledge-node detail surface) | Read `harness/knowledge/node-detail.md` before changing the panel/host split, `enterNodePage`, the record→CanvasNode adapter, `nodeDetailDescriptor.ts`, save-failure handling, or missing-node/cross-surface/Escape behavior. Key contracts: `WorkspaceNodes/NodeDetailPanel.tsx`, `WorkspaceNodes/nodeDetailDescriptor.ts`, `WorkspaceNodes/NodeCanvasPreview.tsx`, `RightDock/dock-store.ts`, `WorkspaceNodes/useWorkspaceNodes.ts`, `Workbench/KnowledgeChatPortal.tsx`. Tests: `WorkspaceNodes/__tests__/NodeDetailPanel.test.tsx`, `RightDock/__tests__/dock-store.test.ts`, `Workbench/__tests__/ChatDockLifecycle.test.tsx` |

- | Canvas Agent and tools | `src/main/agent/`, `src/main/agent/tools/`, `src/renderer/src/modules/chat/components/` |

- | Diagnose Canvas Agent latency or verify an optimization | `harness/skills/diagnose-agent-latency/SKILL.md`; trace model and exporter details: `harness/knowledge/langfuse-observability.md` |

- | Canvas Agent full-chain Langfuse observability | `harness/knowledge/langfuse-observability.md` |

- | xterm sizing for agent/terminal surfaces | Read `harness/knowledge/terminal-surfaces.md` before changing xterm sizing/fit behavior for agent nodes, terminal nodes, or the workspace terminal dock. Key contracts: `AgentNodeBody/utils/terminal.ts`, `TerminalNodeBody/index.tsx`, `WorkspaceTerminalDock/index.tsx`. Tests: `AgentNodeBody/utils/terminalFit.test.ts` |

- | AI Chat loading states | Read `harness/knowledge/chat-sessions.md` before changing session loading flags (`sessionsLoading` vs `sessionLoading` vs stream `loading`) or the submit veto. Key contracts: `src/renderer/src/modules/chat/sessions/useChatSessions.ts`, `modules/chat/components/ChatComposer/useChatComposerInput.ts`, `modules/chat/components/ChatSessionsRail/index.tsx`, `modules/chat/components/ChatPanel/ChatHeader.tsx`, `modules/chat/components/ChatMessages/ChatThreadSkeleton.tsx`. Tests: `modules/chat/sessions/useChatSessions.test.tsx`, `modules/chat/components/ChatComposer/__tests__/useChatComposerInput.submit-veto.test.tsx`, `modules/chat/components/__tests__/ChatSessionLoading.test.tsx` |

- | Full-page chat ↔ dock Tabs | Read `harness/knowledge/chat-sessions.md` before changing the full-page chat topbar, its dock-content-tabs toggle, or the dock inset rule. Key contracts: `chat/ChatPageBody/index.tsx`, `RightDock/dock-content-tabs.ts`. Tests: `RightDock/__tests__/dock-content-tabs.test.ts`, `RightDock/index.test.tsx` |

- | Dock width policy | Read `harness/knowledge/chat-sessions.md` before changing right-dock width behavior. Key contract: `RightDock/dock-width.ts`. Tests: `RightDock/__tests__/dock-width.test.ts`, `RightDock/index.test.tsx` |

- | Coding agents in the Coding Agent node (roster, brand marks, launch flags, per-node session binding) | Read `harness/knowledge/coding-agent-registry.md` before adding/removing an agent, changing per-agent launch flags, or changing how a node binds to one CLI conversation. Key contracts: `src/renderer/src/config/agentRegistry.ts`, `modules/coding-agent/session/piSession.ts`, `src/main/agent/codex-sessions.ts`. Bound tests (`coding-agent-roster` rule, `harness/validate/validation.yaml`): `AgentNodeBody/__tests__/AgentPicker.test.tsx`, `AgentNodeBody/__tests__/AgentIcon.test.tsx`, `AgentNodeBody/__tests__/piSessionBinding.test.tsx`, `modules/coding-agent/session/piSession.test.ts`, `utils/__tests__/codingAgentCommand.test.ts`. |

- | Multi-role chat (@角色 group chat + relay) | Read `harness/knowledge/agent-roles.md` before changing role marker/routing, the relay stream protocol, handoff policy, renderer role rendering, external CLI drivers, or the stopped-vs-failed turn rule. Key contracts: `src/shared/agent-roles.ts`, `src/main/agent/role-turn.ts`, `src/main/agent/roles-store.ts`, `src/main/agent/external/`, `src/main/agent/chat-stop.ts`. Tests: `src/main/agent/__tests__/role-turn.test.ts`, `src/main/agent/__tests__/external-driver.test.ts`, `src/main/agent/segment-execution.test.ts`, `src/main/agent/chat-stop.test.ts`. |

- | Agent long-term memory (global + per-workspace) | `src/main/agent/memory-store.ts` (store + prompt injection; explicit-save-only by design), `src/main/agent/tools/memory.ts` (`memory_save` eager; `memory_list`/`memory_forget`/`memory_adopt` deferred — `memory_adopt` is the sole cross-workspace write path, reserved for user-confirmed candidates from the `memory-review` default skill), tests in `src/main/agent/__tests__/memory-store.test.ts` + `tools-graph.test.ts` |

- | Artifact runtime capabilities (page → host actions) | `src/shared/artifact-capabilities.ts` (trust model + contract), `src/main/artifacts/capability-ipc.ts` (`artifact-capability:invoke`, main-side authoritative validation), `src/renderer/src/modules/artifacts/internal/capabilityBridge.ts` + `ArtifactTabView` (host-authored bridge script, postMessage relay, audit toast). Capabilities are declared on the artifact RECORD by creating code (never by the page), gated on a real user gesture in the bridge, and every write surfaces a toast. Current capabilities: `memory.adopt`, `skill.save` (both = the user's click IS the confirmation). Tests: `src/main/artifacts/__tests__/capability-invoke.test.ts` |

- | Artifact pin lifecycle + Library drawer | `src/main/artifacts/ipc.ts` — pin refuses sentinel (`__*`) scopes, dedupes against a live mirror, list/get lazily clear a stale `pinnedNodeId`, delete removes the canvas mirror node; `artifact:list-all` (metadata-only summaries) skips `__*` dirs EXCEPT `__global_chat__` (session-store sentinel rule — a blanket skip silently hides global artifacts). Library drawer = renamed ReferenceDrawer: Pinned entries persist per workspace via the `references` IPC domain (`src/main/references/`, `src/shared/references.ts`, hydrate/save in `Workbench/useReferenceEntries.ts`); Artifacts source tab is `ReferenceDrawer/ArtifactsPicker.tsx` (cross-scope pin disabled by design). Tests: `src/main/artifacts/__tests__/pin-lifecycle.test.ts` |

- | Headless (background) agent runs | `src/main/agent/headless-run.ts` (one-shot bounded Engine run: no session store, `builtInTools:{}` = structurally read-only, wall-clock timeout, never throws), `src/main/agent/memory-report.ts` (first consumer — cross-workspace memory report as self-contained HTML; adoption stays interactive-only; scheduled entry archives to `<memory>/reports/` with rolling retention AND publishes a `__global_chat__`-scoped artifact, surfaced by an OS notification whose click pushes `dock:open-artifact`). Tests: `src/main/agent/__tests__/headless-run.test.ts` |

- | Scheduled tasks | Read `harness/knowledge/scheduled-tasks.md` before changing cadence/DST math, catch-up or `intervalMinutes` migration, the run-finished toast/dock-chat chain, or the scheduled session-store vocabulary. Key contracts: `src/shared/scheduled.ts`, `src/main/scheduled/`, `src/shared/agent-chat.ts`, `src/renderer/src/shared/dock/dock-chat-availability.ts`, `src/main/agent/tools/scheduled.ts`. Tests: `src/shared/scheduled.test.ts`, `src/main/scheduled/scheduled-task-service.test.ts`, `src/main/__tests__/scheduled-run-notify.test.ts`, `src/renderer/src/shared/dock/dock-chat-availability.test.ts`. |

- | Dock web tabs (the embedded browser) | Read `harness/knowledge/dock-browser.md` before changing guest navigation, identity/routing, retention, focus, shortcuts, or tab overflow. Key contracts: `src/shared/webview-registration.ts`, `src/shared/link-open.ts`, `src/shared/dock-shortcuts.ts`; main policy/registry under `src/main/app/` + `src/main/webview/`; renderer ownership under `IframeNodeBody/webview-identities.ts`, `RightDock/`, and `LinkDrawer/`. |

- | Add a capability shared by Tool + CLI | `../../harness/skills/add-canvas-capability/SKILL.md`; use `harness/skills/add-agent-tool/SKILL.md` for the optional task-specific Canvas Agent adapter |

- | Agent teams | `src/main/agent-teams/`, `src/renderer/src/modules/agent-team/` |

- | Runtime-control server | `src/main/runtime/control-server.ts` |

- | Agent Plugins market, package precedence, install/trust state, and MCP adaptation | `harness/knowledge/plugin-market.md`, `src/shared/plugin-market.ts`, `src/main/plugin-market/` |

- | Plugin node contract | `harness/knowledge/plugin-node-mf2.md`, `src/plugins/types.ts`, `src/plugins/main/`, `src/plugins/renderer/`, `src/plugins/mock-node/` |

- | Project records (perf analyses, roadmaps) | `docs/` |

- | Channel plugin | `src/plugins/main/channel/README.md`, `src/plugins/main/channel/` |

- | Boundary, file-size, and UI-reuse gates | `src/main/__tests__/import-boundaries.test.ts`, `src/main/__tests__/file-size-governance.test.ts`, `src/main/__tests__/ui-reuse-governance.test.ts` |

- | Storage/plugin/runtime tests | `src/main/canvas/__tests__/storage.test.ts`, `src/plugins/main/__tests__/registry.test.ts`, `src/main/runtime/__tests__/control-server.test.ts` |

- | Local validation | `harness/validate/validation.yaml` |

- | Choose proportionate local validation | `harness/skills/validate-canvas-change/SKILL.md` |

+ | Main/renderer/preload boundary, shared contracts | `harness/knowledge/conventions/architecture-boundaries.md`, `harness/skills/add-ipc-surface/SKILL.md` |

+ | Renderer conventions / module architecture | `harness/knowledge/conventions/frontend.md`, `harness/spec/renderer-modules/README.md`, `harness/skills/check-renderer-structure/SKILL.md` |

+ | Main conventions / domain and entry map | `harness/knowledge/conventions/backend.md`, `harness/knowledge/main-domain-modules.md` |

+ | Full-app routes, shell, Library, dock placement | `harness/knowledge/renderer-surfaces.md` |

+ | Child-process PATH, bundled CLI/skills, install/repair queue | `harness/knowledge/packaged-tooling.md` |

+ | Chat runtime/queue/stop, sessions/loading, approvals, attachments, rail, dock chat and widths | `harness/knowledge/chat-sessions.md` |

+ | Multi-role chat, external drivers, relay, stopped-versus-failed behavior | `harness/knowledge/agent-roles.md` |

+ | Keyboard shortcuts, menu accelerators, terminal/webview key ownership | `harness/knowledge/keyboard-shortcuts.md` |

+ | Agent/terminal xterm fit and sizing | `harness/knowledge/terminal-surfaces.md` |

+ | Coding Agent roster, branding, launch flags, session binding | `harness/knowledge/coding-agent-registry.md` |

+ | Dock browser, focus/navigation, retention/capture, overflow | `harness/knowledge/dock-browser.md` |

+ | Knowledge-node detail panels and cross-surface behavior | `harness/knowledge/node-detail.md` |

+ | Storage, edges, mindmap transactions, artifact pins | `harness/knowledge/main-domain-modules.md`, `src/shared/canvas.ts` |

+ | Runtime security, memory/adoption, artifact capabilities, headless runs | `harness/knowledge/security-posture.md` |

+ | Schedules, catch-up/DST, completion notification flow | `harness/knowledge/scheduled-tasks.md` |

+ | Agent plugins market, package/trust state, MCP adaptation | `harness/knowledge/plugin-market.md` |

+ | Add node capability / plugin node contract | `harness/skills/add-canvas-node/SKILL.md`, `harness/knowledge/plugin-node-mf2.md` |

+ | Add agent tool / built-in main plugin | `harness/skills/add-agent-tool/SKILL.md`, `harness/skills/add-builtin-main-plugin/SKILL.md` |

+ | Capability shared by Tool + CLI | `../../harness/skills/add-canvas-capability/SKILL.md` |

+ | Latency and tracing | `harness/skills/diagnose-agent-latency/SKILL.md`, `harness/knowledge/langfuse-observability.md` |

+ | Add/reuse a UI primitive or verify visual baseline | `harness/skills/extend-blessed-ui/SKILL.md`, `harness/tools/ui-showcase/README.md` |

+ | Agent teams / channel plugin | `src/main/agent-teams/`, `src/renderer/src/modules/agent-team/`; `src/plugins/main/channel/README.md` |

+ | Drive the app / choose validation | `harness/skills/canvas-harness/SKILL.md`, `harness/skills/canvas-onboard-harness/SKILL.md`, `harness/skills/validate-canvas-change/SKILL.md` |

+ | Known defects / current check bindings | `harness/knowledge/known-defects.md`, `harness/validate/validation.yaml` |

- ## Local Constraints

+ ## Hard boundaries

- - Renderer code reaches privileged behavior only through the typed

- `window.canvasWorkspace` preload API. Do not import Electron, Node, `src/main`,

- or `src/preload` from renderer code.

- - Cross-process contracts should move toward `src/shared/`. Existing preload

- imports from `src/renderer/src/types.ts` are allowlisted migration debt; do

- not add new preload-to-renderer imports.

- - Keep main-process code in domain folders under `src/main/`; preserve

- IPC channel names and preload API shape when refactoring.

- - Agent tool names, schemas, and descriptions under `src/main/agent/tools/`

- ship in the main bundle. Keep descriptions concise and run the bundle gate

- for tool-surface growth; repeated usage prose belongs in the system prompt.

- - Follow file-size governance: new production `.ts`/`.tsx` files must stay at

- or below 500 lines, and existing over-500 baseline files must not grow.

- - Runtime data belongs under user locations such as `~/.pulse-coder/canvas/`,

- `~/.pulse-coder/canvas-runtime/`, and model/settings files. Do not write user

- runtime state into the repository.

- - Packaged builds install `@pulse-coder/canvas-cli` + all bundled skills as one versioned, fingerprinted compatibility bundle under `~/.pulse-coder/`; route every install/repair/update trigger (startup, Settings repair, experimental-flag triggers) through the shared `AgentToolingManager` / `agent-tooling-queue`, never a source checkout, `pnpm`, or a global link.

- Guard: `packaged-agent-tooling` rule in `harness/validate/validation.yaml` (`agent-tooling-manager.test.ts`, `agent-tooling-queue.test.ts`, `shell-path.test.ts`, `agent-tooling-package.test.ts`).

- Detail: `harness/knowledge/packaged-tooling.md`.

- - `harness/tools/driver/` launches the real Electron app. Use `temp`, `demo`,

- or `clone` profiles by default; use `real --allow-real-writes` only after

- explicit user intent because it can mutate real Pulse Canvas data.

- Reopening `demo` without `--reset` preserves its existing manifest and

- imported workspaces; fixture reseeding is a reset operation.

- - Canvas Agent scope activation must stay single-flight in `src/main/agent/service.ts`, or an unguarded check-then-initialize creates duplicate engines for one scope and session switching visibly stalls.

- Guard: `src/main/agent/__tests__/service-history.test.ts`.