fix(desktop,web): Open in runs locally for a background service sharing the desktop's T3 home#21661

open15

main

GitHub fork: fix/local-link-actions

opened22d agobyKKinanLak

View on GitHubTwo-way sync enabledPR last imported 7h ago

Problem

With Local environment turned off, the desktop app drives an always-on t3 background service on the same machine through a saved environment (T3 Connect or pairing). https://git.cafe/pingdotgg/t3code/issues/20250 describes this as the supported way to run both. Open in, Reveal in file manager, and the editor picker in the file preview still treat that service as remote:

they fall back to SSH deep links;
these require Remote Login and an SSH route to the same machine;
otherwise they dead-end at "No SSH route" (https://git.cafe/pingdotgg/t3code/issues/18473).

The same happens with VS Code and Zed.

Repro (Linux and macOS):

Run the background service (systemctl --user / launchd).
Turn off Settings → Connections → Local environment.
Add the service as a saved environment over T3 Connect.
Open a project and use Open in or a file preview.

Expected: the editor opens the folder locally, as it does with Local environment on.

Change

https://git.cafe/pingdotgg/t3code/issues/18473 pointed out that the app had no machine identity to tell it is the same machine. #26324 added one on main: the desktop's getHostEnvironmentId reads <stateDir>/environment-id, and the web keeps it in hostEnvironmentIdAtom. This PR reuses that lookup and adds no IPC of its own.

Web:
- resolveRemoteOpenState returns local-exec for the environment whose ID matches the host environment ID, whatever the connection (relay, pairing).
- The Open in picker in thread details and in the file preview is shown for that environment, and its editor list comes from that environment's config instead of the primary's.
Docs: one sentence in the user docs ("Using the Desktop App as a Remote Only").

Unchanged:

The desktop, the server and the wire contracts.
With Local environment on, the host ID equals the primary's ID.
Browsers and mobile have no desktop bridge.
WSL backends.

local-exec still runs through that environment's own shell.openInEditor RPC, so a mismatched ID grants the renderer nothing new. Like the theme lookup, the ID is read once when the window starts, so a service started after the window needs a reload.

Scope and approval

Maintainer approval: not given yet. I asked for direction and scope approval on Ideas #18515 before opening this PR (comment), and it is open for that decision. This PR shows the change it proposes.
Why I opened it now: https://git.cafe/pingdotgg/t3code/issues/20250 names this setup (Local environment off, background service added as an environment) as the supported way to run the desktop next to the service. In that setup Open in and Reveal need SSH back into the same machine, which is the gap https://git.cafe/pingdotgg/t3code/issues/18473 describes.
Ideas discussion: #18515
Original report, closed as a feature request: https://git.cafe/pingdotgg/t3code/issues/18473
Supported setup: https://git.cafe/pingdotgg/t3code/issues/20250 (comment), with the single-owner lock from https://git.cafe/pingdotgg/t3code/pulls/16102
Related, out of scope: https://git.cafe/pingdotgg/t3code/issues/7530 (a browser over a LAN IP, which has no desktop bridge)
Prior attempt at another approach (auto-attach to a running backend), closed: https://git.cafe/pingdotgg/t3code/pulls/8115

Verification

vp run check:changed origin/main passes on head 87b09ef75: format, lint, knip, typecheck, 11 test files (129 tests, browser tests included), React compiler.
New tests:
- a relay environment matching the host ID resolves to local-exec;
- another environment still resolves to SSH deep links when a host ID exists;
- the Open in picker is shown for both the primary and the host environment when they differ.
Manual, desktop dev build on Linux (Xvfb), before the switch to the #26324 lookup:
- Setup: Local environment off. A separate t3 serve runs on the same T3 home with a seeded project and is paired as a saved environment. Thread details → Open in menu.
- Before (main): the editors open over SSH, with the hint "Opens over SSH. Needs your key on <host>", and there is no Files entry.
- After: the same editors run locally, and Files (reveal) is offered.
Before (main) After
Not checked: the T3 Connect relay route (I paired over loopback; the remote-open decision only looks at the environment ID, not the route), macOS, Windows.

Claude Opus 5.5 (claude-opus-5-5) via Claude Code in T3 Code

Fixes pingdotgg/t3code#30992

Checks

20 successful · 10 skipped

All checks passed

Added 2 commits22d ago

fix(desktop): read the home environment ID without suspending the sync IPCc4bc20c
fix(desktop,web): Open in runs locally for a background service sharing the desktop's T3 homed695ffe

MmacroscopeappBotapproved these changes22d ago

MmacroscopeappBot22d ago

Approvability

Verdict: Approved at c4bc20c

Macroscope's review found this PR approvable — This is a narrowly scoped, tested fix that reads an existing desktop-home identity and corrects existing Open in and file-reveal routing for a same-machine background service. Other environment and non-desktop behavior remains unchanged, with no schema, security, infrastructure, or static-analysis changes.

^{You can add or adjust custom eligibility rules. Learn more.}

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Walkthrough

The desktop exposes its home environment ID through synchronous IPC. The web app uses that ID to identify the local-machine environment for editor selection and Open In checks, and to resolve matching remote targets as local execution.

Changes: Home environment identification and routing

Layer / File(s)	Summary
Expose the desktop home environment ID `packages/contracts/src/ipc.ts`, `apps/desktop/src/ipc/channels.ts`, `apps/desktop/src/ipc/methods/localEnvironment.ts`, `apps/desktop/src/ipc/DesktopIpcHandlers.ts`, `apps/desktop/src/preload.ts`, `apps/desktop/src/ipc/methods/localEnvironment.test.ts`	The desktop reads and trims the home environment ID and exposes it through synchronous IPC and the desktop bridge. The handler returns `null` when the file is missing or empty. The test checks missing and populated files.
Use local-machine identity for editor and picker state `apps/web/src/localEnvironment.ts`, `apps/web/src/state/primaryEnvironment.ts`, `apps/web/src/state/server.ts`, `apps/web/src/components/chat/OpenInPicker.logic.ts`, `apps/web/src/components/ChatView.tsx`, `apps/web/src/components/files/FilePreviewPanel.tsx`, `docs/user/remote-access.md`	Web state uses the primary environment ID when available and otherwise falls back to the desktop home ID. Editor lookup and Open In checks use the local-machine environment ID. The documentation describes the shared-home behavior.
Resolve matching home environments as local execution `apps/web/src/remoteOpen.ts`, `apps/web/src/components/ChatMarkdown.tsx`, `apps/web/src/remoteOpen.test.ts`	Remote-open resolution receives the desktop home environment ID and selects local execution when the target is absent or matches that ID. Markdown media handling passes the ID, and tests cover matching and non-matching relay targets.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

mermaid

1	sequenceDiagram
2	participant ChatMarkdown
3	participant readDesktopHomeEnvironmentId
4	participant desktopBridge
5	participant DesktopIPC
6	participant resolveRemoteOpenState
7	ChatMarkdown->>readDesktopHomeEnvironmentId: Read desktop home environment ID
8	readDesktopHomeEnvironmentId->>desktopBridge: Call getHomeEnvironmentId
9	desktopBridge->>DesktopIPC: Send synchronous IPC request
10	DesktopIPC-->>desktopBridge: Return ID or null
11	desktopBridge-->>readDesktopHomeEnvironmentId: Return ID or null
12	ChatMarkdown->>resolveRemoteOpenState: Pass target and home environment ID
13	resolveRemoteOpenState-->>ChatMarkdown: Return local-exec or remote state

Possibly related PRs

pingdotgg/t3code#26547 — Both changes address a Desktop app and background server that share a T3 home. This change uses the home environment ID to classify matching connections as local.
pingdotgg/t3code#24507 — Both changes update local Open In decisions and resolveRemoteOpenState. This change adds matching desktop home environment IDs to the local-execution condition.

Suggested labels: bugfix

Suggested reviewers: macroscopeapp

Merge Risk: External image Minimal · up to 94b27

The reviewed routing changes are mergeable after normal checks; no concrete issue requiring a fix was established.

Security architecture risk: External image Low · up to 3fe9a

The change enables editor actions for a matching saved environment without removing their permission checks. No new permission bypass was established, although assurance that a matching identity means the same computer remains partly unverified.

Retained concerns No architecture-level concerns identified.

Security review details

Security Blast Radius

inferred — The newly enabled action path reaches the selected service's editor and file-manager execution authority. The inspected flow does not transfer service-provided paths to a separate Electron desktop launch API or establish broader cross-environment execution authority.

Security Findings and Attack Paths

inferred — A service asserting the desktop-home ID could affect local-versus-remote action classification, but that alone does not establish a permission bypass: the inspected launch path still targets the selected environment and requires operation permission. Consequently, identity spoofing was not retained as an active PR security concern.

Trust Boundaries and Controls

observed — The new bridge exposes a fixed-file identifier rather than credentials or a caller-selected filesystem read. The connected-service descriptor and local home file remain distinct identity sources; the routing branch compares their IDs directly without an additional same-machine attestation.

Resilience and Maintainability Implications

observed — Execution controls remain separate from presentation classification: the picker rechecks permission when invoked, markdown reveal checks permission before dispatch, and the shared RPC command authorizes both origin and destination. This preserves control enforcement even when routing state changes.

Hardening Proposals

proposed — Document home-ID equality as an action-routing hint, not proof of machine ownership. Require independently authenticated identity binding before reusing this comparison for credential release, permission grants, or desktop-only execution authority.

Pre-merge checks: ^Passed 3 · ^Failed 1

^Failed Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Description check	Warning	The description covers the problem, change, scope, and verification. However, the required maintainer approval for the proposed direction and scope is explicitly pending, and the PR does not establish…	Add a link to a triaged issue or discussion with an explicit maintainer approval comment that covers the proposed direction and scope. If maintainers consider this a small, focused fix for an obvious bug, explain why it qualifies for that e…

^Passed Passed checks: 3 passed

Check name	Status	Explanation
Title check	Passed	The title clearly and concisely describes the main change: local Open in behavior for a background service sharing the desktop's T3 home.
Linked Issues check	Passed	No active directly linked issue remains. Issue `#8115` is closed and provides historical context only. Its coding requirements do not apply. The PR implements the stated desktop and web behavior, adds f…
Out of Scope Changes check	Passed	The changes stay within the stated scope. Desktop reads the home environment ID. Web uses the matching environment for local execution, editor selection, and file reveal. The IPC, remote-open, and pic…

Full details: Linked Issues check

Explanation

No active directly linked issue remains. Issue #8115 is closed and provides historical context only. Its coding requirements do not apply. The PR implements the stated desktop and web behavior, adds focused tests, and updates the related documentation.

Full details: Out of Scope Changes check

Explanation

The changes stay within the stated scope. Desktop reads the home environment ID. Web uses the matching environment for local execution, editor selection, and file reveal. The IPC, remote-open, and picker tests support this behavior. The documentation describes the same feature. No unrelated change is shown.

Full details: Description check

Explanation

The description covers the problem, change, scope, and verification. However, the required maintainer approval for the proposed direction and scope is explicitly pending, and the PR does not establish that this cross-component behavior qualifies for the small, obvious-bug exemption.

Resolution

Add a link to a triaged issue or discussion with an explicit maintainer approval comment that covers the proposed direction and scope. If maintainers consider this a small, focused fix for an obvious bug, explain why it qualifies for that exemption.

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`apps/web/src/components/files/FilePreviewPanel.tsx`
`apps/web/src/state/primaryEnvironment.ts`
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8	- Line 32: Update the `readFileString` error handling that uses
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apps/desktop/src/ipc/DesktopIpcHandlers.ts
apps/desktop/src/ipc/channels.ts
apps/desktop/src/ipc/methods/localEnvironment.test.ts
apps/desktop/src/ipc/methods/localEnvironment.ts
apps/desktop/src/preload.ts
apps/web/src/components/ChatView.tsx
apps/web/src/components/chat/OpenInPicker.logic.ts
apps/web/src/components/chat/OpenInPicker.test.ts
apps/web/src/components/files/FilePreviewPanel.tsx
apps/web/src/localEnvironment.ts
apps/web/src/remoteOpen.test.ts
apps/web/src/remoteOpen.ts
apps/web/src/state/primaryEnvironment.ts
apps/web/src/state/server.ts
docs/user/remote-access.md
packages/contracts/src/ipc.ts

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apps/desktop/src/ipc/methods/localEnvironment.tsline 32Outdated · c4bc20cResolved by maria

Added 1 commit22d ago

fix(desktop): log unexpected failures reading the home environment IDe80e4f0

KKinanLakreviewed22d ago

CcoderabbitaiBotreviewed22d ago

Added 1 commit21d ago

Merge remote-tracking branch 'origin/main' into fix/local-link-actions3fe9abd

Yyungweng14d ago

Hitting exactly this on 0.1.4-nightly.20261027.3770 (macOS, launchd service, Local environment off). One detail that might be worth a test: my saved environment's active route is the auto-discovered LAN one (http://<lan-ip>:3773), with T3 Connect as the second route. So it's not only the T3 Connect / pairing case from the repro. Matching on the home environment-id should cover both since it ignores the route, which is why I like this approach better than adding LAN IPs to the loopback check.

Right now the only workaround is turning on Remote Login and adding an SSH route to my own machine, which is pretty silly. Would love to see this land.

Ggrahamfarrar13d ago

This matches my setup and would fix the main case. One gap: I also run a second server on the same Mac with its own --base-dir, and its environment ID won't match the desktop's T3 home, so it would still go through SSH. Fine to leave that for a follow-up, but a server-reported machine ID would cover both.

Added 1 commit13d ago

Merge remote-tracking branch 'origin/main' into fix/resolve-pr-conflicts163b13d

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7	Review comments at @apps/web/src/remoteOpen.ts:
8	- Line 60: Update the local-target handling around resolveRemoteOpenState so
9	both the primary environment ID and desktopHomeEnvironmentId count as local for
10	home-target picker visibility. Select editor capabilities using the matching
11	local target’s environment ID so a RelayConnectionTarget sharing the desktop
12	home is handled consistently with local execution.
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apps/desktop/src/ipc/DesktopIpcHandlers.ts
apps/desktop/src/preload.ts
apps/web/src/components/ChatMarkdown.tsx
apps/web/src/components/ChatView.tsx
apps/web/src/components/files/FilePreviewPanel.tsx
apps/web/src/localEnvironment.ts
apps/web/src/remoteOpen.test.ts
apps/web/src/remoteOpen.ts
docs/user/remote-access.md
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apps/web/src/remoteOpen.tsline 60Outdated · 163b13dResolved by maria

Added 1 commit13d ago

fix(web): Open In treats both the primary and the desktop home's server as local94b27d8

KKinanLakreviewed13d ago

CcoderabbitaiBotreviewed13d ago

Added 4 commits11d ago

chore: merge main into local editor fixc0ad4be
refactor(web): simplify shared-home editor selection02c5c50
fix(web): refresh home identity when connections change5633aee
test(web): include home identity in desktop link mock590f811

Mmaria11d ago

Note

Written by gpt-6.1-sol on behalf of Maria

merged current main (9bcf75335f9b) into the existing contributor branch without rebasing or force-pushing. head: 913144af3bbd470e95a7594bdba42e8e266287f9. the merge was clean; no source fixes were needed. the diff against main remains 19 files, 209 additions and 24 deletions.

blacksmith vp run check:changed github/main passed: formatting, lint, knip, typechecks for 35 affected packages, 138 tests in 12 files, and react compiler checks for 8 files. both previously failing browser-test files also passed separately, 171 tests. the pdf failure was also present in main's ci; no unrelated test changes were made.

all 28 reported checks now pass, with no pending checks or conflicts. both independent code reviewers found no blocker or should-fix findings. the existing bot findings are addressed and their threads are resolved.

the saved shared-home desktop connection remains unverified. the earlier verification comment records secure storage preventing connection persistence; browser and ipc tests do not prove that integration. i have preserved that evidence and limitation. no keyring changes were made in this run.

Mmaria11d ago

Note

Written by gpt-6.1-sol on behalf of Maria

Verified in a real dev environment

partial verification of head 590f811ce0abc8de1f23d180e257a0c66207b5ef on this linux boat vm. no source changes or pushes.

installed and ran github/main (6575ce3250) in a separate worktree, then stopped it before running the exact pr head with isolated state. only one dev server ran at a time.
used the repo's playwright dependency with /usr/bin/google-chrome. created a project pointing to the real repo and sent real codex gpt-6.1-sol turns through the web composer. both completed. the pr turn took 9m 13s and returned the package name and a file link. no mocks, seeded conversations, or demo provider.
clicked the returned file link, inspected the real package.json preview, selected files, and clicked open. the native file manager opened the repo with package.json selected. the recording shows this neighboring browser path, not the saved-environment fix.
launched the real electron client with local environment off and the same isolated t3 home as the server. the new synchronous desktopBridge.getHomeEnvironmentId() returned 187d814e-54a8-4ac9-9867-4cd4bef5fa1d, matching the server's environment-id file.
blacksmith: 24 existing tests passed across remoteOpen, server state, desktop local-environment ipc, and OpenInPicker browser tests. the first browser-test attempt lacked chromium; installed it on the worker and the retry passed. current github checks are green.

runtime transcript

browser file preview and files picker on the pr

browser file-link and files interaction recording

native files opened with package.json selected

Not verified

the core fix remains unverified. on both main and the pr, adding the background server as a saved desktop environment fails before the connection is registered:

Could not save the local connection catalog: Desktop secure storage is unavailable in this system context.

the default linux password store opened a new-keyring prompt. i left it untouched, as instructed. the supported --password-store=basic launch avoids that prompt but cannot persist the connection catalog. i did not replace the bridge, fake the saved environment, or change secure-storage code.

therefore i could not reproduce the original ssh-routing bug on main or prove that open in, reveal, and the preview picker use local execution for a saved shared-home environment on the pr. the two captures below show the same setup blocker, not before/after proof of the fix.

main desktop saved-environment pairing blocked by unavailable secure storage

pr desktop saved-environment pairing blocked by unavailable secure storage

also unverified: t3 connect relay, another genuinely remote environment, native editor launches (no vscode or zed installed), wsl, macos, windows, and native ios/android. browser and ipc checks do not substitute for those paths.

Added 1 commit9d ago

chore: merge main into local link actions703b864

KKinanLak8d ago

Thanks @maria-rcks for the thorough testing!

Regarding the secure storage blocker, I found #5427, which documents the same issue on Linux. The suggested workaround is to use --password-store=gnome-libsecret with an unlocked GNOME Keyring instead of basic.

Would it be possible to try this with an isolated test keyring on the VM?

Alternatively, @yungweng reported reproducing this exact bug on macOS in this PR. Their environment might be ideal for validating the fix end-to-end.

Added 3 commits8d ago

Merge branch 'main' into fix/local-link-actions24bf05b
ci: retrigger99006e1
Merge remote-tracking branch 'github/main' into takeover-21661913144a

AAkiVonAkira8d ago

Note

🤖 Claude Opus 5.5 responding on behalf of Kayzel

Another Linux reproduction that matches this PR's setup, with details in https://github.com/pingdotgg/t3code/issues/25781#issuecomment-6590709225:

CachyOS, desktop AppImage nightly, Local environment off.
The server runs as a systemd --user service on 0.1.7-nightly.20261102.4093 with T3CODE_HOME=~/.t3. sshd is on :22 and Tailscale Serve is on.
The service's ~/.t3/userdata/environment-id exists and equals the environment ID that server reports to clients, so getHomeEnvironmentId would match it.

The same bug also happens on Windows 11 with a same-PC t3 serve added as a saved connection. I have not checked whether that server's state directory is the desktop's T3 home there, so I can't say whether this PR covers it. I have not run this PR's build.

JJulius Marmingerequested changes22h ago

Thanks for working on this, @KinanLak. #26324 already adds the desktop host-environment ID lookup and bridge on main. Please cut the duplicated IPC and reuse that lookup, keeping the Open in, reveal, and picker routing changes for the shared-home environment, including relay connections.

Added 1 commit19h ago

Merge remote-tracking branch 'origin/main' into pr-2166187b09ef

KKinanLak19h ago

Thanks @juliusmarminge! Done in 87b09ef75120f26c8a113403ac8eb009ce442e1a: dropped the duplicated getHomeEnvironmentId IPC and reused hostEnvironmentIdAtom from #26324. The PR now only touches the web routing (remote-open resolution, Open in picker in thread details and file preview, the editor list) plus the docs sentence. Desktop and contracts are identical to main.

vp run check:changed origin/main passes on that head.