feat(clients): learn an environment's LAN and tailnet addresses

[juliusmarminge]

Stacked on #15467. Completes #10940.

Problem

With multiple routes, a user still had to pair every address by hand, and a saved LAN route went stale whenever the host's address changed (DHCP, a new Wi-Fi network).

Fix

• Server. ServerConfig.directEndpoints lists the LAN and tailnet addresses the server is bound to, plus the Tailscale Serve name when enabled. A loopback-only server reports none, since its loopback address means a different machine to every client. Optional field, so older clients ignore it.
• Client. When a session is ready, new addresses are saved as learned routes, ranked by kind, and learned routes the server stops reporting are dropped. That is how a changed LAN address replaces the old one. The live session is never replaced for a route-list change; the better-route check then decides whether to move.
• Credentials. A learned route reuses the credential of the route it was learned over: the T3 Connect access token, which works on any origin because each DPoP proof names the URL it signs, or the paired bearer token. An unreachable direct address does not evict the T3 Connect token.
• Limits. Routes the user paired are never rewritten. Removing a route also removes learned routes that borrow its credential. Plain HTTP addresses are skipped on HTTPS pages (app.t3.codes) because of mixed content. Learned routes do not revoke GitHub routing trust.

So pairing once through T3 Connect is enough to use the LAN at home.

Verification

• Typecheck clean for all touched packages.
• New tests: server bound-endpoint resolution, learned-route merge (replace on address change, user routes untouched, loopback and mixed-content skipped, credential borrowing, dependent removal), DPoP authorization on a direct origin without a relay round trip, and a supervisor test that learns the LAN over T3 Connect and moves to it.

Verified in the running app

Paired the web client to a second host over its LAN address only. On the first connection the host reported its tailnet address, and the client saved it as a learned route below the paired LAN route, marked "found automatically":

With the host bound to its tailnet address only, the client fell back to the learned route, then moved back to LAN once it answered again (screenshots in #15467).

This pass found a bug, fixed in 17ac7aa: the learned route was saved without its profile, so after a reload it had no address and was learned again, duplicating the target. Covered by a new registry test.

🤖 Generated with Claude Code (Claude Opus 5.5)

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Codex	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Codex	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Codex	Live turn WebSocket decoded	—	20.9 KiB	—	29.3 KiB	✅
Codex	Live turn messages	—	2	—	8	✅
Claude	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Claude	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Claude	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Claude	Live turn WebSocket decoded	—	21.2 KiB	—	29.3 KiB	✅
Claude	Live turn messages	—	2	—	8	✅

Baseline: unavailable · PR result: 9e84d92 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR introduces automatic LAN and tailnet route discovery, persistence, failover, and credential reuse across server, client-runtime, web, and mobile code. It also changes direct-origin authorization behavior, making the scope and security-sensitive blast radius unsuitable for unattended approval.

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📒 Files selected for processing (10)

• apps/mobile/src/features/settings/EnvironmentRoutesSection.tsx
• apps/server/src/environment/DirectEndpoints.test.ts
• apps/server/src/environment/DirectEndpoints.ts
• apps/web/src/components/settings/EnvironmentRoutesList.tsx
• docs/user/remote-access.md
• packages/client-runtime/src/authorization/layer.test.ts
• packages/client-runtime/src/authorization/service.ts
• packages/client-runtime/src/connection/registry.test.ts
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---

📝 Walkthrough

Walkthrough

The server reports eligible LAN and tailnet endpoints. The client learns and stores routes from those reports, uses their associated credentials to connect, and labels learned routes in settings.

Changes

Learned Direct Routes

Layer / File(s)	Summary
Advertise direct endpoints packages/contracts/src/server.ts, apps/server/src/environment/DirectEndpoints.ts, apps/server/src/environment/DirectEndpoints.test.ts, apps/server/src/server.ts, apps/server/src/ws.ts	Server configuration can include LAN and tailnet endpoint records. The server resolves eligible addresses, optionally adds a Tailscale Serve endpoint, and includes the results in the WebSocket server configuration. Tests cover loopback, wildcard, specific, and public-address binds.
Merge and persist learned routes packages/client-runtime/src/connection/catalog.ts, packages/client-runtime/src/connection/routes.ts, packages/client-runtime/src/connection/registry.ts, packages/client-runtime/src/connection/githubRoutingPermissions.ts, packages/client-runtime/src/connection/routes.test.ts, packages/client-runtime/src/connection/registry.test.ts	The client marks learned bearer routes, merges eligible reported addresses with saved routes, and reuses the source route’s credentials. The registry persists route changes, excludes duplicate or unusable learned routes, and removes learned routes tied to removed credential sources. GitHub routing keys exclude learned routes.
Connect and authorize through learned routes packages/client-runtime/src/connection/supervisor.ts, packages/client-runtime/src/connection/resolver.ts, packages/client-runtime/src/authorization/service.ts, packages/client-runtime/src/state/environmentHttpAuth.ts, packages/client-runtime/src/connection/supervisor.test.ts, packages/client-runtime/src/authorization/layer.test.ts	The supervisor reads server-reported endpoints and checks updated routes. The resolver uses direct endpoints for T3 Connect authorization or looks up the credential owner for other bearer routes. Authorization targets the selected endpoint, with tests for cached-token success and authentication failure.
Describe learned routes apps/mobile/src/features/settings/EnvironmentRoutesSection.tsx, apps/web/src/components/settings/EnvironmentRoutesList.tsx, docs/internals/remote.md, docs/user/remote-access.md	Mobile and web settings label learned routes. The documentation describes route learning, credential reuse, route removal, and LAN access requirements.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Feature

Suggested reviewers: t3dotgg

Sequence Diagram(s)

sequenceDiagram
  participant Server
  participant EnvironmentSupervisor
  participant EnvironmentRegistry
  participant ConnectionResolver
  Server->>EnvironmentSupervisor: Provide directEndpoints in ServerConfig
  EnvironmentSupervisor->>EnvironmentRegistry: Submit active route and reported endpoints
  EnvironmentRegistry-->>EnvironmentSupervisor: Return updated catalog entry
  EnvironmentSupervisor->>ConnectionResolver: Resolve selected route
  ConnectionResolver-->>EnvironmentSupervisor: Return direct-route authorization

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Merge Risk: ⚪ Minimal · up to aa619

No confirmed route-learning issue blocks merging.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the problem, implementation, credentials, limits, and verification. It omits the required Scope and approval section, including a reference to maintainer approval for this bro…	Add a Scope and approval section. Link the triaged issue or discussion and include the maintainer’s explicit approval of the direction and scope. Also use the template’s Change heading instead of Fix, or clearly label the existing section a…
Docstring Coverage	⚠️ Warning	Docstring coverage is 76.92% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 20 files. (1 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: clients learn an environment’s LAN and tailnet addresses.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description explains the problem, implementation, credentials, limits, and verification. It omits the required Scope and approval section, including a reference to maintainer approval for this broader behavior change.

Resolution

Add a Scope and approval section. Link the triaged issue or discussion and include the maintainer’s explicit approval of the direction and scope. Also use the template’s Change heading instead of Fix, or clearly label the existing section as Change.

Full details: Docstring Coverage

Explanation

Docstring coverage is 76.92% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 20 files. (1 skipped: 1 unsupported.)

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Review comments at @packages/client-runtime/src/connection/routes.ts:
- Around line 274-287: Update learned route identity to include the endpoint
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• apps/mobile/src/features/settings/EnvironmentRoutesSection.tsx
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• apps/server/src/environment/DirectEndpoints.ts
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• apps/server/src/ws.ts
• apps/web/src/components/settings/EnvironmentRoutesMenu.tsx
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• docs/user/remote-access.md
• packages/client-runtime/src/authorization/layer.test.ts
• packages/client-runtime/src/authorization/service.ts
• packages/client-runtime/src/connection/catalog.ts
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• packages/client-runtime/src/connection/registry.test.ts
• packages/client-runtime/src/connection/registry.ts
• packages/client-runtime/src/connection/resolver.ts
• packages/client-runtime/src/connection/routes.test.ts
• packages/client-runtime/src/connection/routes.ts
• packages/client-runtime/src/connection/supervisor.test.ts
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🟡 Minor · Scope route learning to credential-bearing connections. · remote-access.md:73-77

docs/user/remote-access.md:73-77
🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Scope route learning to credential-bearing connections.

The current wording includes SSH and primary-route connections, but those routes do not trigger learning. Users connected through them must add LAN or Tailscale routes manually. Limit the claim to T3 Connect or another paired route, and state that SSH and primary routes do not trigger learning.

Suggested fix

-While connected, T3 Code also learns the machine's current LAN and Tailscale
-addresses and adds them as routes, so pairing once through T3 Connect is enough
+While connected through T3 Connect or another paired route, T3 Code also learns
+the machine's current LAN and Tailscale addresses and adds them as routes, so
+pairing once through T3 Connect is enough
 to use the LAN at home. When the machine's LAN address changes, for example
 after it joins another Wi-Fi network, the learned route follows it. The machine
 must allow network access for its LAN address to be learned.
+SSH and primary routes do not trigger route learning.

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Review comment at @docs/user/remote-access.md around lines 73 - 77:
Update the route-learning description to limit learning claims to connections
through T3 Connect or another paired route, and state that SSH and primary
routes do not trigger route learning. Preserve the existing LAN address and
network access details.

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Outside diff comments:
Review comments at @docs/user/remote-access.md:
- Around line 73-77: Update the route-learning description to limit learning
claims to connections through T3 Connect or another paired route, and state that
SSH and primary routes do not trigger route learning. Preserve the existing LAN
address and network access details.

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[github-actions]

🚀 Expo continuous deployment is ready!

• Project → t3-code
• Platforms → android, ios
• Scheme → t3code-preview

	🤖 Android	🍎 iOS
Fingerprint	5732ade7e46c39b2f7bcb9347f37720507d9ed54	acf1b3cac5737444edb4846fbb391836dfe5f85b
Build Details	Build Permalink Details Distribution: INTERNAL Build profile: preview:dev Runtime version: 5732ade7e46c39b2f7bcb9347f37720507d9ed54 App version: 2.0.0 Git commit: aa59fc5de79608134890cebcb9cde643571370d9	Build Permalink Details Distribution: INTERNAL Build profile: preview:dev Runtime version: acf1b3cac5737444edb4846fbb391836dfe5f85b App version: 2.0.0 Git commit: aa59fc5de79608134890cebcb9cde643571370d9
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