open-design/AGENTS.md

Directory guide

This file is the single source of truth for agents entering this repository. Read this file first; after entering apps/, packages/, tools/, or e2e/, read that layer's AGENTS.md for module-level details. Do not copy module details back into the root file; root stays focused on cross-repository boundaries, workflow, and commands.

Core documentation index

• Product and onboarding: README.md, README.zh-CN.md, QUICKSTART.md.
• Contribution and environment: CONTRIBUTING.md, CONTRIBUTING.zh-CN.md.
• Architecture and protocols: docs/spec.md, docs/architecture.md, docs/skills-protocol.md, docs/agent-adapters.md, docs/modes.md.
• Roadmap and references: docs/roadmap.md, docs/references.md, docs/code-review-guidelines.md, specs/current/maintainability-roadmap.md.
• Directory-level agent guidance: apps/AGENTS.md, packages/AGENTS.md, tools/AGENTS.md, e2e/AGENTS.md.
• Packaged auto-update architecture and high-confidence local harness: read tools/pack/AGENTS.md section "Packaged auto-update architecture and harness" before touching packaged updater code, release-channel identity, installer behavior, or updater UI.

Workspace directories

• Workspace packages come from pnpm-workspace.yaml: apps/*, packages/*, tools/*, and e2e.
• Top-level content directories: skills/ (functional skills the agent invokes mid-task — utilities, briefs, packagers; see skills/AGENTS.md), design-templates/ (rendering catalogue: decks, prototypes, image/video/audio templates; see design-templates/AGENTS.md and specs/current/skills-and-design-templates.md), design-systems/ (brand DESIGN.md files), craft/ (universal brand-agnostic craft rules a skill can opt into via od.craft.requires), mocks/ (replay-based mock CLIs for opencode/claude/codex/gemini/cursor-agent/deepseek/qwen/grok, the ACP family devin/hermes/kilo/kimi/kiro/vibe, and the AMR vela CLI (login + models + ACP), built from anonymized Langfuse traces — PATH-overlay drop-in for tests and self-validation; see mocks/README.md).
• apps/web is the Next.js 16 App Router + React 18 web runtime; do not restore apps/nextjs.
• apps/daemon is the local privileged daemon and od bin. It owns /api/*, agent spawning, skills, design systems, artifacts, and static serving.
• apps/desktop is the Electron shell; it discovers the web URL through sidecar IPC.
• apps/packaged is the thin packaged Electron runtime entry; it starts packaged sidecars and owns the od:// entry glue only.
• packages/contracts is the pure TypeScript web/daemon app contract layer.
• packages/sidecar-proto owns the Open Design sidecar business protocol; packages/sidecar owns the generic sidecar runtime; packages/platform owns generic OS process primitives.
• tools/dev is the local development lifecycle control plane.
• tools/pack is the local packaged build/start/stop/logs control plane, packaged updater harness, installer identity/registry validation surface, and mac beta release artifact preparation surface.
• tools/serve is the local fixture-service control plane; first service is tools-serve start updater for deterministic updater metadata and artifacts.
• e2e owns user-level end-to-end smoke tests and Playwright UI automation; read e2e/AGENTS.md before editing its tests or commands.

Inactive or placeholder directories

• apps/nextjs and packages/shared have been removed; do not recreate or reference them.
• .od/, .tmp/, Playwright reports, and agent scratch directories are local runtime data and must stay out of git.

Development workflow

Environment baseline

• Runtime target is Node ~24 and pnpm@10.33.2; use Corepack so the pnpm version pinned in package.json is selected.
• New project-owned entrypoints, modules, scripts, tests, reporters, and configs should default to TypeScript.
• Residual JavaScript is limited to generated output, vendored dependencies, explicitly documented compatibility build artifacts, and the allowlist in scripts/guard.ts.

Windows native

• macOS, Linux, and WSL2 are the primary supported paths. Windows native is best-effort — file an issue if it doesn't work.
• Historical Windows-specific friction is documented in closed issues #10, #96, #100, #203, and #315; check the issue tracker for the current state before filing new reports.
• Install Node 24. Either winget install OpenJS.NodeJS.LTS (currently Node 24.x) or download from https://nodejs.org. After install, verify with node --version — the WinGet LTS pointer rolls to the next major in October 2026, so re-verify if you re-run the install command later. Do not use Node 22 — see FAQ.
• corepack enable fails with EPERM on Windows (cannot write shims to Program Files). Use npm install -g pnpm@10.33.2 instead.
• better-sqlite3 has no prebuilt binary for win32/Node 24; pnpm install will compile it from source via node-gyp (~2 min). Requires Visual Studio Build Tools 2022 or newer. This is expected — not a sign of version incompatibility.
• For tools-dev start/stop/status usage, see "Local lifecycle" below.

Local lifecycle

• Use pnpm tools-dev as the only local development lifecycle entry point.
• Do not add or restore root lifecycle aliases: pnpm dev, pnpm dev:all, pnpm daemon, pnpm preview, or pnpm start.
• Ports are governed by tools-dev flags: --daemon-port and --web-port.
• tools-dev exports OD_PORT for the web proxy target and OD_WEB_PORT for the web listener; do not use NEXT_PORT.

Root command boundary

• Keep root scripts reserved for true repo-level checks and tools control-plane entrypoints: pnpm guard, pnpm typecheck, pnpm tools-dev, pnpm tools-pack, and pnpm tools-serve.
• Do not add root aggregate pnpm build or pnpm test aliases. Build/test commands must stay package-scoped (pnpm --filter <package> ...) or tool-scoped (pnpm tools-pack ...).
• Do not add root e2e aliases; e2e package commands and ownership rules live in e2e/AGENTS.md.

Release channel model

• beta is the daily R&D/development validation channel. It is optimized for fast development feedback and is not part of the stable promotion gate.
• nightly is the internal validation channel for stable delivery. Stable releases remain gated by validated nightly artifacts.
• preview is an independent early-access channel with stable-like release rigor. It should use preview versions such as X.Y.Z-preview.N, publish to the preview R2 channel, publish updater feeds under preview/latest, and follow stable's platform policy including the existing optional Linux enablement.
• stable is the formal delivery channel. Do not make stable promotion depend on preview; stable continues to depend on nightly only.
• Public packaged app identity must stay channel-distinct: stable uses Open Design, beta uses Open Design Beta, and preview uses Open Design Preview. Do not ship beta or preview mac DMGs whose drag-install app bundle is Open Design.app.
• Windows beta updater validation must use the real beta namespace release-beta-win; otherwise a local beta-like namespace can create a separate uninstall registry key while looking like the same Open Design Beta app. See tools/pack/AGENTS.md for the architecture map and high-confidence acceptance harness.

Boundary constraints

• Tests under apps/, packages/, and tools/ live in a package/app/tool-level tests/ directory sibling to src/; keep src/ source-only and do not add new *.test.ts or *.test.tsx files under src/. Playwright UI automation belongs to e2e/ui/, not app packages.
• App packages must not import another app's private src/ or tests/ implementation as a shared helper. In particular, apps/web/** must not import apps/daemon/src/**; web/daemon integration belongs behind HTTP APIs, packages/contracts, and app-local provider boundaries.
• Cross-app, cross-runtime, or repository-resource consistency checks belong in e2e/tests/ when they need to observe more than one app/package boundary; promote reusable logic to a pure package instead of borrowing another app's private source.
• Keep shared API DTOs, SSE event unions, error shapes, task shapes, and example payloads in packages/contracts; update contracts before wiring divergent web/daemon request or response shapes.
• Keep packages/contracts pure TypeScript and free of Next.js, Express, Node filesystem/process APIs, browser APIs, SQLite, daemon internals, and sidecar control-plane dependencies.
• Keep project-owned entrypoints, modules, scripts, tests, reporters, and configs TypeScript-first; generated dist/*.js is runtime output, and source edits belong in .ts files.
• New .js, .mjs, or .cjs files need an explicit generated/vendor/compatibility reason and must pass pnpm guard.
• App business logic must not know about sidecar/control-plane concepts. Keep sidecar awareness in apps/<app>/sidecar or the desktop sidecar entry wrapper.
• Shared web/daemon app contracts belong in packages/contracts; that package must not depend on Next.js, Express, Node filesystem/process APIs, browser APIs, SQLite, daemon internals, or the sidecar control-plane protocol.
• Sidecar process stamps must have exactly five fields: app, mode, namespace, ipc, and source.
• Orchestration layers (tools-dev, tools-pack, packaged launchers) must call package primitives; do not hand-build --od-stamp-* args or process-scan regexes.
• Packaged runtime paths must be namespace-scoped and independent from daemon/web ports; ports are transient transport details only.
• Default runtime files live under <project-root>/.tmp/<source>/<namespace>/...; POSIX IPC sockets are fixed at /tmp/open-design/ipc/<namespace>/<app>.sock.

Capability exposure (UI/CLI dual-track)

Every user-facing capability must be reachable through both the web UI and the od CLI (apps/daemon/src/cli.ts). Shipping a feature with only one of the two surfaces is a regression.

• The CLI is the embeddability contract. External agents (hermes-agent, openclaw, custom Slack/Discord bots, packaged runtimes invoked from another shell) drive Open Design through od subcommands — they do not render the web UI. If a capability is UI-only, it cannot be composed into those external agents.
• Both surfaces must call the same /api/* endpoints; do not let the CLI talk to one shape and the UI to another. The daemon HTTP layer is the single source of truth, with packages/contracts carrying the shared DTOs.
• The CLI form must support --json for machine-readable output and accept long-form prompts via --prompt-file <path|->, so jobs that pipe through xargs, jq, and <heredoc stay clean.
• Adding a new capability is a three-step closure: HTTP endpoint in apps/daemon/src/*-routes.ts (with a contract type in packages/contracts/src/api/), UI surface in apps/web/src/, and od <capability> subcommand in apps/daemon/src/cli.ts registered through SUBCOMMAND_MAP. Land all three in the same PR; do not stage them across PRs.
• The PR template's Surface area checklist must reflect both surfaces. If you ticked UI, tick CLI too — and vice-versa — or explain in the PR body why the missing surface is genuinely not applicable (e.g. an internal-only daemon health probe). "I'll do the CLI later" is not a valid reason.
• Existing reference points: od automation … mirrors the Automations tab against /api/routines; od plugin …, od ui …, od project …, od media …, od mcp …, od research … follow the same shape. Copy that pattern for new capabilities.

Git commit policy

• Git commits must not include Co-authored-by trailers or any other co-author metadata.

Pull request expectations

• Opening a PR uses .github/pull_request_template.md; fill every section, not just the title.
• "Why" must answer both the author's use case (what made you write this PR) and the pain being addressed (user problem, technical debt, prod issue, or unblocker), not just a one-line restatement of the title.
• "What users will see" describes the change from a user's perspective — what they click, what new thing appears, what default behavior changed — not from a code perspective.
• The Surface area checklist must reflect actual surfaces touched; check every box that applies, including extension points (skills/, design-systems/, design-templates/, craft/), CLI flags, env vars, i18n keys, and new root package.json dependencies.
• If any UI surface is checked, attach screenshots showing the entry point — where users discover the change — not just the feature in isolation; before/after is best for behavior changes.
• For bug-fix PRs, link the red-spec test that reproduces the bug and confirm it went red on main and green on the branch, per the Bug follow-up workflow section above.
• CONTRIBUTING.md covers PR scope, title format, dependency policy, and the issue-first rule for non-trivial features; docs/code-review-guidelines.md is the reviewer-facing complement.

Code review guide

• Use docs/code-review-guidelines.md as the repository-wide review standard. That document is the operational guide; this AGENTS.md is the source of truth when the two disagree.
• Walk reviews top-down through docs/code-review-guidelines.md: Product relevance test → forbidden surfaces → ownership/scope → matching lane → checklist → comments → approval bar.
• Pick the matching review lane: default code/tests, contract and protocol changes, design-system additions, skill additions, or craft additions.
• Before reviewing changes under apps/, packages/, tools/, or e2e/, read that directory's AGENTS.md and apply its local boundaries.
• Blocking review feedback should focus on correctness, security/secrets, data integrity, repository boundary violations, contract/migration breakage, missing required validation, or high-risk maintainability issues.
• Only maintainers may close a PR instead of requesting changes, and only when the change is not salvageable on the existing branch (wrong target product, foreign test harness, DOM/API assumptions absent from this repo, or scripts that conflict with lifecycle rules).

PR-duty tooling

This repository no longer ships a maintainer PR-duty control plane. The former pnpm tools-pr workflow has moved to the standalone PerishCode/duty project so personal review-lane automation does not become product workspace maintenance surface. Do not recreate tools/pr, @open-design/tools-pr, or a root pnpm tools-pr script without a new explicit maintainer decision.

Agent runtime conventions

• RuntimeAgentDef.promptInputFormat selects how the daemon writes the prompt to a child's stdin. The default 'text' writes the composed prompt and ends stdin immediately. 'stream-json' wraps the prompt as one JSONL user message and KEEPS stdin open so the daemon can stream further user messages back in mid-turn. Claude (apps/daemon/src/runtimes/defs/claude.ts) ships 'stream-json' together with --input-format stream-json so the host can answer interactive tools like AskUserQuestion with a real tool_result block. Every other agent stays on 'text'.
• apps/daemon/src/server.ts tracks run.pendingHostAnswers (a Set of tool_use_id strings) and run.stdinOpen on the run object. The claude-stream-json event handler adds AskUserQuestion ids to the set and closes stdin only when both the set is empty AND a turn_end (or usage) event arrives with a non tool_use stop_reason. The tool_use stop reason means the model paused mid tool (waiting on claude-code's internal runner or on a host answer); closing stdin there would truncate the follow up response.
• claude-stream.ts emits the turn_end event AFTER iterating the assistant message's content blocks, not before. When --include-partial-messages is unsupported, tool_use events surface only from the assistant wrapper, so emitting turn_end first would let the daemon close stdin before the host had registered any pending answers.
• POST /api/runs/:id/tool-result is the daemon endpoint for feeding a tool_result block back into a still running stream-json child. Body shape: { toolUseId: string, content: string, isError?: boolean }. Web callers use submitChatRunToolResult from apps/web/src/providers/daemon.ts. The daemon writes a JSONL user message containing one tool_result content block, removes the id from pendingHostAnswers, and lets the next turn_end decide when to close stdin.
• AskUserQuestion specifically: Claude's system prompt section in apps/daemon/src/prompts/system.ts (Claude only block at the bottom of composeSystemPrompt) tells the model to use the tool for 2 to 4 finite choices, and to stop generating tokens after the tool call instead of also writing a markdown duplicate. AssistantMessage.suppressAskUserQuestionFallbackText is the belt and suspenders that hides any trailing markdown text in the same turn.

Chat UI conventions

• apps/web/src/components/file-viewer-render-mode.ts decides URL-load vs srcDoc for HTML previews. Bridges (deck, comment/inspect selection, palette, edit, tweaks) can ONLY inject through the srcDoc path. Add a new disqualifier to UrlLoadDecision whenever a feature needs a srcDoc-only bridge; pass it from FileViewer.tsx based on a source-content heuristic where appropriate (e.g. hasTweaksTemplate). The host keeps both iframes mounted simultaneously and swaps CSS visibility so toggling render mode does not cause an iframe reload flash; iframeRef.current stays aligned with the active iframe via useEffect. Receive filters use isOurIframe(ev.source) to accept messages from either iframe but signals that should ONLY come from the active iframe (e.g. od:tweaks-available) re-check ev.source === iframeRef.current?.contentWindow.
• TodoWrite UI pins one canonical task list above the chat composer via PinnedTodoSlot in ChatPane.tsx. The slot reads the latest TodoWrite snapshot across the conversation through latestTodoWriteInputFromMessages (apps/web/src/runtime/todos.ts). AssistantMessage.stripTodoToolGroups removes any TodoWrite tool groups from per message rendering so there is exactly one TodoCard on screen. The progress count includes both completed and in_progress items (1/4 reads "one underway" not "zero finished"). Dismissal via the Done button is keyed on the snapshot's JSON, so a fresh TodoWrite from the agent automatically re shows the card. PinnedTodoSlot sits OUTSIDE the .chat-log scroll container, so auto-scroll requires explicit coverage: ChatPane's ResizeObserver accepts a containerRef from PinnedTodoSlot and observes that element directly, and a pane-level MutationObserver (childList: true on the chat pane ancestor) re-syncs that observation whenever the slot mounts or unmounts as new TodoWrite snapshots arrive.
• AskUserQuestionCard (in ToolCard.tsx) prefers the live onAnswerToolUse(toolUseId, content) route (POSTs to /api/runs/:id/tool-result) and falls back to the legacy onSubmitForm(text) path when the run has already terminated. Selected chips persist across reloads by parsing the stored tool_result.content back into the selections shape.
• Tool group rendering uses dedupeSnapshotToolRetries to collapse identical AskUserQuestion retries (one card per unique input, keeping the latest tool_use_id) and TodoWrite snapshots (only the most recent call, since each call is a state replace).

Web CSS ownership

• apps/web/src/index.css is an import-only cascade entrypoint. Do not add selectors or declarations there; add imports only when a truly global stylesheet is needed, and keep import order intentional.
• Shared global styles belong in apps/web/src/styles/: design tokens, base/reset rules, primitives, app-shell layout, and legacy cross-component selectors that cannot safely be scoped yet. Keep domain-level global files grouped by owner (for example styles/viewer/ and styles/workspace/) instead of adding more large files directly under styles/.
• New component-owned UI styles should default to CSS Modules next to the component (Component.module.css) instead of expanding global stylesheets. This is preferred for isolated components, panels, menus, drawers, toolbars, cards, and form sections.
• When touching an existing component with nearby global styles, prefer migrating that component's local selectors to a CSS Module as part of the change if it is small and testable. Do not mix a large mechanical move with behavior/styling changes in the same patch.
• Keep global class names only for deliberate shared contracts: reusable primitives, theme hooks, third-party/content styling, cross-component layout, or selectors that rely on global cascade/specificity. Document any new global selector group with its owning feature.
• CSS refactors must preserve cascade semantics. For mechanical splits, verify expanded import content/order matches the previous stylesheet; for CSS Module migrations, validate the affected UI path with pnpm --filter @open-design/web typecheck and a focused build/test or visual check when practical.

i18n keys

• apps/web/src/i18n/types.ts is the typed Dict; every key must be defined in all 18 locale files under apps/web/src/i18n/locales/*.ts (ar, de, en, es-ES, fa, fr, hu, id, ja, ko, pl, pt-BR, ru, th, tr, uk, zh-CN, zh-TW). Add the key to types.ts first; missing translations produce a typecheck error.

UI animation philosophy

• Default ease-out for UI transitions: cubic-bezier(0.23, 1, 0.32, 1). Built-in ease is too weak; ease-in is forbidden for UI elements because it feels sluggish.
• Asymmetric durations: enter around 200ms, exit around 140ms. Exit reads as decisive because the user has already chosen to dismiss.
• Accordion expand and collapse uses grid-template-rows: 0fr -> 1fr (modern auto height pattern). Pair with opacity fade and the easing above. The shared .accordion-collapsible + .accordion-collapsible-inner class pair (defined in apps/web/src/index.css) is the canonical implementation; reuse it for new disclosure UI.
• Never animate from transform: scale(0). Start from scale(0.9) or higher with opacity: 0.
• For elements that show conditionally, keep them mounted and toggle a CSS class (e.g. .chat-jump-btn-active). React unmounts skip the exit transition entirely.

Validation strategy

• After package, workspace, or command-entry changes, run pnpm install so workspace links and generated dist entries stay fresh.
• For agent-stream / parser changes (apps/daemon/src/claude-stream.ts, json-event-stream.ts, qoder-stream.ts, etc.), replay a recorded session through the mock CLIs in mocks/ to verify event shapes round-trip without burning provider budget. PATH-overlay activation: export PATH="$PWD/mocks/bin:$PATH" OD_MOCKS_TRACE=<8-char-id> OD_MOCKS_NO_DELAY=1. See mocks/README.md for the trace catalog and selection knobs.
• Treat every pnpm-lock.yaml change as requiring a Nix pnpm deps hash refresh check. nix/pnpm-deps.nix is a generated lock artifact; use pnpm nix:update-hash only when intentionally maintaining Nix packaging, then re-run nix flake check --print-build-logs --keep-going. Contributors without Nix can rely on the PR Validate workspace gate, which now uploads or auto-applies the generated hash-only fix when possible.
• Before marking regular work ready, run at least pnpm guard and pnpm typecheck, plus the package-scoped tests/builds that match the files changed. Do not use or add root pnpm test/pnpm build aliases.
• For local web runtime loops, prefer pnpm tools-dev run web --daemon-port <port> --web-port <port>.
• On a GUI-capable machine, validate desktop by running pnpm tools-dev, then pnpm tools-dev inspect desktop status.
• Stamp/namespace changes must validate two concurrent namespaces and run desktop inspect eval plus inspect screenshot for each namespace.
• Path/log changes must run pnpm tools-dev logs --namespace <name> --json and confirm log paths are under .tmp/tools-dev/<namespace>/....

Bug follow-up workflow

The following is a working playbook for routine bug follow-ups, distilled from recent practice. Treat it as a default action shape, not a contract — production reality always has edges these bullets can't anticipate, so use judgment when the situation doesn't fit cleanly.

• Lead with a red spec. Default to encoding the bug as a falsifiable test that goes red before any source change, so the fix is anchored in observable behavior rather than source-code intuition. If a red spec can't be written cheaply, that's usually a signal to clarify scope rather than push forward on a guess.
• Try the cheapest layer first. Reach for the lightest test layer that can still see the symptom (e2e Vitest at the daemon HTTP boundary → app-local Vitest → Playwright UI → platform-native harnesses), and drop down only when the cheaper layer can't.
• Hold the spec's scope. Defects discovered outside the bug's described boundary belong in a follow-up — their own red spec, their own PR — not in this fix. List them in the PR body's "Adjacent issues" section with the rationale and move on.
• Let the fix read as an invariant. Prefer a named helper whose docblock describes what must hold over a bolt-on if guard with apologetic history-comments. The call site should read as intent.
• Diff against the baseline. When neighboring suites have pre-existing failures, stash or check out upstream before claiming "no new failures."
• Link the issue from the PR body. Use Fixes #N / Closes #N / Resolves #N so the issue auto-closes on merge and the release-time reverse lookup (gh issue view N --json closedByPullRequestsReferences → git tag --contains <merge sha>) actually has a chain to follow. The repo's PR template prompts for this; deleting the prompt is fine when the PR genuinely closes nothing.
• Stage human verification for visible bugs. When the symptom needs an eye to confirm — UI, platform-native behavior, animations, race conditions a unit test can't see — green specs alone aren't acceptance. Stand up a buggy-vs-fix comparison the reviewer can drive themselves (typical shape: two namespaced runtimes, one on main, one on the fix branch), and seed any required data only through production HTTP APIs; source-level test backdoors invalidate the verification because they prove a fake flow rather than the real one.

For a worked example of one full loop (red e2e spec → fix → green), see e2e/tests/dialog/stop-reconciles-message.test.ts (issue #135).

Common commands

pnpm install
pnpm nix:update-hash
pnpm tools-dev
pnpm tools-serve start updater
pnpm tools-dev start web
pnpm tools-dev run web --daemon-port 17456 --web-port 17573
pnpm tools-dev status --json
pnpm tools-dev logs --json
pnpm tools-dev inspect desktop status --json
pnpm tools-dev inspect desktop screenshot --path /tmp/open-design.png
pnpm tools-dev stop
pnpm tools-dev check

pnpm guard
pnpm typecheck

pnpm --filter @open-design/web typecheck
pnpm --filter @open-design/web test
pnpm --filter @open-design/web build
pnpm --filter @open-design/daemon test
pnpm --filter @open-design/daemon build
pnpm --filter @open-design/desktop build
pnpm --filter @open-design/tools-dev build
pnpm --filter @open-design/tools-pack build
pnpm --filter @open-design/tools-serve build

pnpm tools-pack mac build --to all
pnpm tools-pack mac install
pnpm tools-pack mac cleanup
pnpm tools-pack win build --to nsis
pnpm tools-pack win install
pnpm tools-pack win cleanup
pnpm tools-pack linux build --to appimage
pnpm tools-pack linux install
pnpm tools-pack linux build --containerized

FAQ

Why is there no root pnpm dev / pnpm start?

To avoid starting daemon, web, and desktop through inconsistent env, port, namespace, or log paths. All local lifecycle flows must go through pnpm tools-dev.

Why should apps/nextjs not be restored?

The current web runtime is apps/web. The historical apps/nextjs layout has been removed from the active repo shape; restoring it would reintroduce duplicate app boundaries and stale scripts.

How does desktop discover the web URL?

Desktop queries runtime status through sidecar IPC. The web URL comes from tools-dev launch status, not from desktop guessing ports or reading web internals.

How are sidecar-proto, sidecar, and platform split?

@open-design/sidecar-proto owns Open Design app/mode/source constants, namespace validation, stamp fields/flags, IPC message schema, status shapes, and error semantics. @open-design/sidecar provides only generic bootstrap, IPC transport, path/runtime resolution, launch env, and JSON runtime files. @open-design/platform provides only generic OS process stamp serialization, command parsing, and process matching/search primitives, consuming the proto descriptor.

Where is data written?

The daemon writes .od/ by default: SQLite at .od/app.sqlite, agent CWDs under .od/projects/<id>/, saved renders under .od/artifacts/, and credentials at .od/media-config.json. Two env vars override the storage root, in order:

1. OD_DATA_DIR=<dir> — relocates all daemon runtime data to <dir> (used by Playwright for test isolation, and by the packaged daemon and the Home Manager / NixOS modules to point the daemon at a writable directory when the install root is read-only). The path is resolved with ~/ expansion and relative paths anchored to <projectRoot>.
2. OD_MEDIA_CONFIG_DIR=<dir> — narrower override that relocates only media-config.json. Same resolution semantics. Most installs do not need this; it exists for setups that want to keep API credentials in a different location from the rest of the runtime data.

Default precedence is OD_MEDIA_CONFIG_DIR > OD_DATA_DIR > <projectRoot>/.od.

When is pnpm install required?

Run pnpm install after changing package manifests, workspace layout, command entrypoints, bin/link-related content, or after adding/removing workspace packages.

Can I use Node 22 instead of Node 24?

No. package.json#engines specifies node: "~24", which is the only supported runtime. The current lockfile pins better-sqlite3@11.10.0; on Windows it has no prebuilt binary for Node 24 and is built from source via node-gyp (see the Windows native section). Older Node versions are not tested and may hit lockfile or dependency incompatibilities.