Working on Fusion from inside a machine that already runs one, a plain
`pnpm dev` shares that instance's LIVE database. Everything durable hangs off
$HOME/.fusion — settings, credentials, central DB, the embedded Postgres data
dir — and a process pointed at a data dir whose postmaster is already running
attaches to it instead of starting its own.
--isolated spawns the dev child with HOME pointed at a sandbox, so it gets its
own settings, credentials and Postgres cluster on its own port. It also moves
the child's cwd, which is the half that is easy to miss: `fn dashboard`
derives its project from the working directory and has no project flag, so
isolating HOME alone leaves both instances on `<repo>/.fusion` — including
`.fusion/tasks/<id>/`, which the orphaned-task-dir sweep re-imports, so a
fresh dev database would adopt the real instance's tasks.
The sandbox defaults to ~/.fusion-dev/<checkout-name>/{home,project}: outside
the work tree so it neither shows up in git status nor dies on a clean
checkout, and keyed by checkout so two clones cannot collide. The project dir
is git init-ed on first use because Fusion projects are git work trees.
Changing cwd is safe because PRELOAD/LOADER/ENTRY are already absolute.
Verified in a container beside a running Fusion: the isolated instance
reported zero projects while the real one reported two, on separate Postgres
clusters (ports 42617 and 38311).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The banner re-derived the token from ~/.fusion/settings.json. That is simply
the wrong source: on a real run the file contained no daemonToken while the
dashboard's own banner, two lines above, printed a working one — so the
tunnel claimed no token existed next to a token that plainly did.
The dashboard already holds the resolved token at the point where it reports
its bound port, so it now reports both over the same IPC message and the
wrapper prefers that over anything it could derive. The env/settings lookup
survives only for targets that report nothing, such as an explicit
--tunnel=PORT aimed at a server the dev child knows nothing about. The token
crosses the existing parent/child channel only; it is never logged or sent
onward.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The tunnel target was resolved from PORT/4040 before anything bound, but an
occupied port makes the dashboard silently rebind to an ephemeral one
(server.listen(0) on EADDRINUSE). With a normal Fusion already running on
4040, `pnpm dev --tunnel` therefore published THAT instance under a
dev-looking URL while the dev server sat unreachable on a random port.
The dashboard now reports the port it actually bound to the dev supervisor
over IPC, and the wrapper tunnels that:
- IPC is enabled whenever --tunnel is set, not only in watch mode; a plain
tunnel run previously had no channel at all.
- The tunnel waits for the report (60s cap, then falls back to the configured
port with a warning), so it also cannot come up against a port nothing is
serving yet.
- A mismatch is logged instead of silent.
- A reported port is treated as the dashboard whatever its number, so the
banner keeps printing the bearer token; without that, the ephemeral case
would classify the dev dashboard as a foreign port and drop it.
- An explicit --tunnel=PORT names a target the dev child knows nothing about,
so it never waits and is still compared against the configured port.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Operator case: someone works inside a remote Fusion (a container, a shared box),
starts a dev server there, and needs to view it from their own browser. The dev
server binds inside that machine, so without a tunnel the only options are port
publishing or a VPN — both needing cooperation from whoever owns the host.
pnpm dev --tunnel # tunnels the dashboard port (PORT, default 4040)
pnpm dev --tunnel=5173 # tunnels a Vite dev server instead
pnpm dev --tunnel dashboard # tunnel the default port AND run the dashboard
FUSION_DEV_TUNNEL=1 pnpm dev
Cloudflare QUICK tunnels are usable here precisely because a dev server is HTTP:
no account, no domain, no card. The TCP endpoints that SSH would have needed
require a card (ngrok) or a domain plus Zero Trust (Cloudflare) — that asymmetry
is why this exists for HTTP only, and it is recorded in the module header so the
next person does not retry the SSH variant.
Design decisions:
- Tunnel failure is NON-FATAL. A missing cloudflared or a tunnel that never
publishes a URL logs and is skipped; losing a preview URL must never cost the
operator their dev loop.
- Watch-mode restarts reuse the existing tunnel. A fresh quick tunnel hands out a
different hostname each time, which would invalidate an already-shared link.
- `--tunnel` consumes a following token only when it is numeric, so
`--tunnel dashboard` forwards `dashboard` to the dev command rather than
tunnelling port NaN. That is the bug this flag shape invites, so it is tested.
Verified end to end in a container: a dev server bound to 127.0.0.1 inside it was
fetched from the public internet through the tunnel (200, correct body). Also
confirmed that tunnelling the DASHBOARD port does not weaken auth — unauthenticated
requests through the tunnel return 401 for /api/tasks, /api/settings and
/api/artifacts, with only /api/health open by design.
Adding two fields to parseDevWrapperArgs' return broke two existing strict toEqual
assertions; those were updated rather than loosened to toMatchObject. 27 tests pass.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
## Summary
Add an opt-in source-development loop that restarts the dashboard and
engine when runtime TypeScript or JSON changes. Use `pnpm dev:watch`;
`pnpm dev:hmr` now combines Vite UI HMR with the same supervised
API/engine restart path.
The watcher filters tests, fixtures, generated declarations, build
output, and task state. It coalesces bursts with a two-second maximum
wait, waits for the child to acknowledge its IPC listener, and rebuilds
runtime dist artifacts before a source-triggered respawn.
## Safety model
- Close scheduler, triage, heartbeat, mission, routine, self-healing,
and merge admission before checking for active work.
- Let already-running agents reach a safe boundary; do not mutate
durable pause settings.
- Enter the existing graceful exit-code-86 shutdown and supervised
respawn path.
- Retry failed liveness reads and declined restart requests instead of
dropping the pending change.
- Keep ordinary `pnpm dev` behavior unchanged; inherited watch state
does not break nested non-dashboard development commands.
A development restart intentionally replaces the dashboard process, so
transient dashboard connections and project dev-server children
reconnect or restart with it. Agent work is the protected boundary.
## Validation
- `pnpm lint`
- `pnpm test:gate` (753 tests passed across engine, core, PostgreSQL
gate, and CI-shape suites)
- Focused CLI watcher/restart/supervision suites: 40 tests passed
- Focused engine drain/manager suites: 52 tests passed
- `pnpm --filter @runfusion/fusion typecheck`
- `pnpm --filter @fusion/engine typecheck`
- `pnpm verify:fast` (13 steps passed, including CLI build and real
health boot smoke)
- Manual unsupported-command probe confirms explicit `--watch` fails
clearly outside the dashboard command
## Post-Deploy Monitoring & Validation
- Watch for `[fusion:dev] source changed`, `source restart deferred`,
`active work drained`, and `restart requested` logs during the first
watched development session.
- Healthy behavior is one exit-86 respawn per edit batch, no interrupted
active agents, refreshed dist artifacts, and a healthy dashboard after
respawn.
- Investigate repeated restart loops, watcher attachment warnings,
declined restart retries, or liveness-read failures.
- Immediate mitigation is to use ordinary `pnpm dev` without `--watch`;
no production runtime behavior or durable setting needs rollback.
- Validation owner: Fusion maintainers during the first source edit
after merge.
---
[](https://github.com/EveryInc/compound-engineering-plugin)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added `pnpm dev:watch` to automatically restart development runtime
processes when source files change.
* Development restarts now wait for active work to finish, preventing
new work from starting during the transition.
* Enhanced `pnpm dev:hmr` with graceful runtime source restarts while
keeping the dashboard available.
* Rapid source changes are grouped to avoid unnecessary restarts.
* **Documentation**
* Updated development setup and contribution guides with the new watch
workflow.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
- pnpm dev / new pnpm start default to the dashboard command
- fn dashboard (and bare fn/fusion/npx, incl. packaged binaries) now runs
supervised by default via an attached foreground child (TUI-safe);
--no-supervise opts out; FUSION_RESTART_EXIT_CODE=86 = intentional restart
- New /api/system routes: info, restart, rebuild jobs with SSE output,
engine restart, agents restart-all, plugins reload-all, log tail
- System tab: rebuild & restart (source checkouts only, hidden elsewhere),
restart server/engine/agents, backup DB, live server logs, copy
diagnostics, report bug; new Plugins tab reusing PluginManager
- Desktop restart via Electron app.relaunch(); DashboardLogSink now keeps a
bounded history + listener feed for the log viewer
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The Grok stale-dist bug was possible because the dev/build path never
refreshed plugin dist:
- The `client` prebuild (default `pnpm dev dashboard`) rebuilt only
@fusion/core + @fusion/engine + @fusion/dashboard, never plugins.
- The FN-6638 stale-dist startup warning only scanned packages/, never
plugins/, so a source-ahead plugin dist ran phantom-old with no warning.
Changes:
- build-workspace.mjs: add `--plugins-only` to plan/build just the plugins
that changed, reusing the existing content-hash skip cache (cheap no-op when
unchanged).
- scripts/dev-prebuild-client.mjs: new orchestrator — fast core/engine/
dashboard build, then incremental changed-plugin rebuild. The `client`
prebuild now runs this single cross-platform command.
- dist-freshness.mjs: scan plugin roots (plugins/, plugins/examples/) so a
stale plugin dist is warned like a stale package dist; the warning names the
plugin dir.
Verified: --plugins-only plans only plugins, skips unchanged on the second
run, and re-plans exactly the one plugin whose source changed. All script and
CLI lib tests pass.
Fusion-Task-Id: FN-7779
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
pnpm dev/local dashboard prebuild now rebuilds @fusion/core and @fusion/engine alongside the dashboard UI (was client-only), and startup warns loudly when built dist/ is older than src/. Prevents the FN-6638 class where landed engine fixes silently never run because the process loads stale dist.
