paseo/docs/development.md

Development

Prerequisites

• Node.js (see .tool-versions for exact version)
• npm workspaces (comes with Node)

Running the dev server

npm run dev

scripts/dev.sh runs the daemon and Expo together via concurrently, fronted by portless so each service is reachable at a stable name like https://daemon.localhost / https://app.localhost instead of a fixed port. The underlying TCP ports are ephemeral — never hardcode them. (Windows uses scripts/dev.ps1, which still binds the daemon to localhost:6767 directly.)

PASEO_HOME

PASEO_HOME is the directory that holds runtime state (agents, sockets, daemon log). Resolution rules:

• The server itself (e.g. when launched by the desktop app or npm run start) defaults to ~/.paseo (see packages/server/src/server/paseo-home.ts).
• npm run dev from a git worktree derives a stable home like ~/.paseo-<worktree-name> and, on first run, seeds it from ~/.paseo by copying agent/project JSON metadata and config.json. Checkout/worktree directories are not copied.
• npm run dev from the main checkout (not a worktree) uses a fresh mktemp directory under $TMPDIR and removes it on exit. Set PASEO_HOME explicitly to keep state across runs.

Override knobs:

PASEO_HOME=~/.paseo-blue npm run dev          # explicit home
PASEO_DEV_SEED_HOME=/path/to/home npm run dev # seed from a different source home
PASEO_DEV_RESET_HOME=1 npm run dev            # clear and reseed the derived worktree home

Daemon endpoints

• Stable daemon launched by the desktop app: localhost:6767.
• npm run dev (macOS/Linux): portless URLs only — read them from the dev.sh banner or portless get daemon / portless get app.
• npm run dev (Windows): localhost:6767 for the daemon.

In any worktree-style or portless setup, never assume default ports.

Desktop renderer profiling

npm run dev:desktop starts Electron with Chromium remote debugging enabled on http://127.0.0.1:9223 so renderer CPU profiles can be captured through CDP. Override the port with PASEO_ELECTRON_REMOTE_DEBUGGING_PORT when 9223 is busy.

React render profiling

The app has a gated React render profiler in packages/app/src/utils/render-profiler.tsx. Wrap the component boundary you want to measure with RenderProfile, then open the app with ?renderProfile=1. When the query param is absent, RenderProfile returns children directly and records nothing.

Captured samples are exposed on globalThis.__PASEO_RENDER_PROFILE__. Call globalThis.__PASEO_RESET_RENDER_PROFILE__?.() after warm-up and before the interaction you want to measure. If a memo comparator or subscription boundary needs explanation, call recordRenderProfileReasons(id, reasons) while profiling; reason counts are exposed on globalThis.__PASEO_RENDER_PROFILE_REASONS__.

Use this workflow for any render investigation:

1. Add stable RenderProfile boundaries around the suspected root and expensive children. Keep IDs specific enough to compare before and after.
2. Reproduce against real app state, not toy fixtures, whenever practical.
3. Record an idle baseline first. If idle is noisy, fix or account for that before optimizing the interaction.
4. Warm up the route, reset profiler samples, run the exact interaction, then compare actualDuration, render counts, and per-commit samples.
5. When a memo boundary still renders, record reasons before changing code. Do not guess from object identity alone.
6. Keep changes that move the measured profile. Remove probes or memo wrappers that do not move the number.

What this caught during the workspace tab investigation:

• A large apparent workspace cost was real interaction work, not daemon noise; the idle baseline stayed near zero.
• The expensive stream rerender was mostly prop identity churn from pane context callbacks and capability objects, not new stream data.
• Stabilizing provider actions at the pane boundary helped because every mounted panel consumes that context.
• Comparing value-shaped capability flags beat preserving object identity through unrelated stores.
• Some plausible fixes did not pay off: memoizing the tab row and composer draft object barely moved the profile, so they were removed.

Existing scenario script: workspace agent/terminal tab switching. Start Expo on web, keep a daemon available, then run:

PASEO_PROFILE_SERVER_ID=<server-id> \
PASEO_PROFILE_WORKSPACE_ID=<workspace-path> \
PASEO_PROFILE_AGENT_ID=<agent-id> \
  npm run profile:workspace-tabs --workspace=@getpaseo/app

This script opens the app with ?renderProfile=1, creates a temporary terminal tab, switches between a real agent and that terminal, prints aggregated React Profiler timings, then removes the temporary terminal. It is an example of the workflow above, not the only way to use the profiler. Useful knobs:

PASEO_PROFILE_APP_URL=http://localhost:19010 # Expo web URL
PASEO_PROFILE_SWITCH_COUNT=1                # number of agent/terminal switch pairs
PASEO_PROFILE_SWITCH_WAIT_MS=250            # delay after each click
PASEO_PROFILE_IDLE_WAIT_MS=3000             # idle baseline before switching
PASEO_PROFILE_DUMP_COMMITS=1                # include per-commit profiler samples

Desktop macOS compositor watchdog

macOS display sleep can leave Chromium's GPU-process display link — the vsync source that drives frame production — stuck on a stale display. The compositor then stops producing frames and the window looks frozen: unresponsive to clicks and keys even though the renderer and every process stay alive. It self-recovers after a few minutes, which is too long for a foreground app.

setupDarwinCompositorWatchdog (packages/desktop/src/window/compositor-watchdog/index.ts) guards against this. It polls the renderer for frame production every couple of seconds and, after a sustained stall while the window is visible and unlocked, restarts the GPU process so Chromium rebuilds the display link. The probe is skipped while the screen is locked or the window is hidden or minimized, since a window legitimately stops producing frames then.

Daemon logs

Check $PASEO_HOME/daemon.log for daemon logs. The default level is info; set PASEO_LOG_LEVEL=trace before launching the daemon when you need full provider, session, and agent-manager traces for stuck-state debugging.

The supervisor rotates daemon.log. Persisted log.file.rotate settings in $PASEO_HOME/config.json win first. Without persisted config, the optional PASEO_LOG_ROTATE_SIZE and PASEO_LOG_ROTATE_COUNT env vars override the defaults. The default rotation is 10m x 3 files everywhere.

paseo.json service scripts

worktree.setup and worktree.teardown accept either a multiline shell script or an array of commands. Both run sequentially.

{
  "worktree": {
    "setup": "npm ci\ncp \"$PASEO_SOURCE_CHECKOUT_PATH/.env\" .env\nnpm run db:migrate",
    "teardown": "npm run db:drop || true"
  }
}

Every scripts entry with "type": "service" receives these environment variables:

Variable	Value
PASEO_SERVICE_<NAME>_URL	Proxied daemon URL for a declared peer service. Prefer this for peer discovery; it survives peer restarts.
PASEO_SERVICE_<NAME>_PORT	Raw ephemeral port for a declared peer service. Use only as a bypass escape hatch; it can go stale if that peer restarts.
PASEO_URL	Self alias for PASEO_SERVICE_<SELF>_URL.
PASEO_PORT	Self alias for PASEO_SERVICE_<SELF>_PORT.
HOST	Bind host for the service process.

<NAME> is normalized from the script name by uppercasing it, replacing each run of non-A-Z0-9 characters with _, and trimming leading or trailing _. For example, app-server and app.server both normalize to APP_SERVER; that collision fails at spawn time with an actionable error.

PORT is not injected by default. If a framework requires PORT, set it in the command:

{
  "scripts": {
    "web": {
      "type": "service",
      "command": "PORT=$PASEO_PORT npm run dev:web"
    }
  }
}

Built workspace packages

Package imports resolve through package exports to compiled dist/ output, not sibling src/ files. This is true in local dev and in published packages: the app, daemon, CLI, and SDK consumers should all exercise the same runtime paths.

npm run dev, npm run dev:server, and npm run dev:app build the workspace packages they need once, then keep @getpaseo/protocol and @getpaseo/client fresh with TypeScript watch builds while the daemon or Expo runs. If you change protocol schemas or client code outside those watch workflows, rebuild the producer before trusting runtime behavior.

Use the named root build targets instead of remembering workspace dependency chains:

npm run build:client       # protocol -> client
npm run build:server-deps  # highlight -> relay -> protocol -> client
npm run build:server       # server-deps -> server -> cli
npm run build:app-deps     # highlight -> protocol -> client -> expo-two-way-audio

Use npm run build:server whenever you have changed any daemon/server-facing package and need clean cross-package types or runtime behavior.

For tighter loops, you can rebuild a single workspace:

• Changed packages/protocol/src/* or packages/client/src/*: npm run build:client.
• Changed packages/server/src/*, packages/cli/src/*, packages/relay/src/*, or packages/highlight/src/*: npm run build:server.
• Changed app build dependencies: npm run build:app-deps.

CLI reference

Use npm run cli to run the in-repo CLI from source (npx tsx packages/cli/src/index.ts). The globally installed paseo binary on macOS is a symlink into the installed Paseo desktop app, not this checkout — use it to drive the desktop's built-in daemon, but use npm run cli when you want to talk to the CLI you are editing.

npm run cli -- ls -a -g              # List all agents globally
npm run cli -- ls -a -g --json       # Same, as JSON
npm run cli -- inspect <id>          # Show detailed agent info
npm run cli -- logs <id>             # View agent timeline
npm run cli -- daemon status         # Check daemon status

Use --host <host:port> to point the CLI at a different daemon:

npm run cli -- --host localhost:7777 ls -a

Agent state

Agent data lives at:

$PASEO_HOME/agents/{cwd-with-dashes}/{agent-id}.json

Find an agent by ID:

find $PASEO_HOME/agents -name "{agent-id}.json"

Find by content:

rg -l "some title text" $PASEO_HOME/agents/

Provider session files

Get the session ID from the agent JSON (persistence.sessionId), then:

Claude:

~/.claude/projects/{cwd-with-dashes}/{session-id}.jsonl

Codex:

~/.codex/sessions/{YYYY}/{MM}/{DD}/rollout-{timestamp}-{session-id}.jsonl

Testing with Playwright MCP

Point Playwright MCP at the running Expo web target. Under npm run dev (macOS/Linux) that is the portless URL printed in the dev banner — typically https://app.localhost. If you start Expo directly with expo start --web (no portless), Metro defaults to http://localhost:8081.

Do NOT use browser history (back/forward). Always navigate by clicking UI elements or using browser_navigate with the full URL — the app uses client-side routing and browser history breaks state.

App web deploys

packages/app exports a single-page Expo web app and deploys the dist/ directory to Cloudflare Pages with npm run deploy:web --workspace=@getpaseo/app.

PWA install metadata lives in packages/app/public/manifest.json and is linked from packages/app/public/index.html. Keep the install icons in public/ so Cloudflare serves them from stable root URLs after expo export.

Do not add service-worker caching casually. Paseo is a live control surface for agents, and an aggressive service worker can strand installed users on stale web code. If offline behavior becomes a product requirement, add it deliberately with an update strategy and test the installed-app upgrade path.

Expo troubleshooting

npx expo-doctor

Diagnoses version mismatches and native module issues.

Typecheck

Always run typecheck after changes:

npm run typecheck