[teamleaderleo]

The chat and New Tab composers’ Computer menus now warn before dispatching to a connected machine at its CPU or free-memory budget. It shows a quiet warning tint and a precise detail such as “High load: 14/10 cores busy” or “Low memory: 1.2 GB free”. Healthy machines keep their existing rows. Settings > General > Agent Chat includes Show Machine Load Warnings, on by default.

The existing status refresh uses the daemon's cached minute reading, the same source used by the native machine sidebar. Budget overrides are respected; there is no added poller. Disconnected machines keep their readiness message. Placement roles are not present on these rows, so this change adds no build-role plumbing.

Leo's request (ask-5e97611b66):

"Likewise, look, when you are dispatching or sending off to different machines, I think it should optionally show you if a machine is potentially under high load and just warn. Okay? Because if it's, like, sometimes really high load, it becomes nigh unrecoverable because, well, you know, the thing crashes, right? So, I mean, only in extreme circumstances is this absolutely necessary, but even then it's like, well, I don't know. After a certain point, do you really want to be adding too many agent sessions running at once, right? Likewise, you know, that split between, okay, this is a build mach[ine]..."

Validation:

• Focused web tests passed at ce088c2a4c17de89fd96864e1bc0f2c06a456e32: cmux-ci run 40998609115, 64 parser/menu tests and 18 New Tab tests. The later generated-export-only commits do not alter web behavior.
• Before/after and gallery alternatives were rendered and inspected: capture run 41002149690. The selected design is tint plus detail; icon plus detail and detail-only remain in the gallery. Before/after capture.
• Independent Codex gpt-6-astra review returned SHIP at 6f3ed62dd8d0e0a514270e3487b56346cbdd3e58 after the generated exports were applied. The fleet app compile-check passed at that exact head: job fb5599b3c560bcb5523fc0d4, kind cmux-next-swift-check, command cmux-next-swift-check.sh 6f3ed62dd8d0e0a514270e3487b56346cbdd3e58 --app, on the Linux-pool worker (190 second build, artifact uploaded).

Risk: the native relay carries a bounded subset of cached health into the composer. Each local connection permits one read at a time, with a two-second deadline; replies use the existing bounded inbound queue and request-ID filter. Closed connections discard late replies. Daemon access rules remain unchanged. Native compilation passed at the exact head as recorded above.

Capture tour-agent-pane at a813e4d64a0b (fleet build, capture mini, text checked for private data)

Light	Dark

Capture scene-settings at a813e4d64a0b (fleet build, capture mini, text checked for private data)

Light	Dark

These fleet captures satisfy the real-capture guard but do not reach the changed Computer-menu warning or Settings toggle; the existing before/after gallery image above shows the Computer-menu warning variants. The Settings toggle is not shown in these captures.

Validation at a813e4d64a0be74dac863d4857a1b39d14526a1b: independent Astra delta review returned SHIP; fleet app compile-check fd3556966cd8560320bdd36c passed in 88 seconds. L10n run 41054084252 used the exact head tree and confirms both added keys have all 21 locales; 112 unrelated base omissions remain. CI run 41052652253 passed its web shards and aggregate.

Agent session: agent session

[teamleaderleo]

Bead cx-4tl6im created for this PR by the cmux coordinator.

[teamleaderleo]

Review (codex gpt-6-astra): SHIP at b3e13e0

Independent full-file review, high reasoning and fast mode. All earlier findings are resolved. Static review only; native compilation remains unverified, and the Swift HOLD remains in force.

[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Review 6f3ed62: HQ feed card · gallery before/after runs · checks

App of this head (app.zip, kept 1 day)

gh workflow run reload-build.yml -R manaflow-ai/cmux --ref feat-cmux-next -f tag=pr27102 -f ref=lane/p0-machines-composer-load -f platform=macos -f backend_mode=local

Passes: CI passes on a813e4d64a.

CI passes on a813e4d64a (run 41052927576 attempt 1).

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

red: cmux-next checks (god files, concurrency, crash safety, l10n); no finished base run on bb383a7 to compare; do not merge until green; see lane-rules

Gallery before/after for 6f3ed62: the capture produced no images (run).

[github-actions]

Default changes

This pull request changes 6 defaults at 6f3ed62dd8d0 (what everyone gets without configuring anything):

• setting.agentPane.showMachineLoadWarnings: (none) -> true
• setting.tabs.nativeNewTabPage: (none) -> false (a new setting, off by default: passes on its own)
• tunable-source.CmuxNextAgentPane/AcpmuxPaneMethods+ReplyShapes.swift:replyShapes: "f5d370fa79ee61c3399b1fa44053174a9d47bacb50ea9fd0fd742e14b2407c7d" -> "26b9b7cd6584a7628355be27d4708454d28a0e1fdc114e11f2b38a3e0d83aeef"
• tunable-source.CmuxNextSettings/AgentPaneComposerSetting.swift:descriptors: "7598da32766cf0071c98b164baec84d2eafbd0076778b4ae73af822abe78f0e5" -> "d515b180aadca119344359f8441fe2a7878518797bc3a5ac729be0915ec61b54"
• tunable-source.CmuxNextSettings/AgentPaneComposerSetting.swift:parse: "0e34b1e6f802e0df019967e1d38cbbd25040bfc899dbff85953cc0c374f7041f" -> "7bed96e3840a99799322b59d824ade1bd69aa8fb78bb81241a09a326df1f2a17"
• tunable-source.CmuxNextSettings/AgentPaneComposerSetting.swift:showMachineLoadWarningsPath: (none) -> "798133063712541c2168b9df5a7ac175dea6ae2695e9c4d6113b92d047c49b3f"

Needs a review. It passes with an independent review receipt on this commit: a comment or review whose first line is Review (<reviewer>): SHIP at 6f3ed62dd8d0e0a514270e3487b56346cbdd3e58, from a member, not a self-review (the newest verdict naming the head decides; a later BLOCK beats an earlier SHIP), or with an approving review on this commit from @lawrencecchen or @austinywang (the call owners in .github/defaults-call-owners.json, never the author). A receipt posted as a review re-runs this check; after a plain comment, re-run it. The needs a call label alone does not pass, and a new push needs a new receipt.

Regenerate the snapshot with python3 scripts/ci/defaults_guard.py snapshot.

[blacksmith-sh]

Found 10 test failures on Blacksmith runners:

Failures

Test	View Logs
/tmp/tmpin3s_a0d/summary-fail.json (live):/summary-fail.json (live):	View Logs
/tmp/tmpkzlsbq2d/summary-missing.json (live):/summary-missing.json (live):	View Logs
[new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows/ [new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows	View Logs
[new_workspaces] the window draws no frames/[new_workspaces] the window draws no frames	View Logs
[tabs] debug.tab_switch timed 0 of 40 switches/ [tabs] debug.tab_switch timed 0 of 40 switches	View Logs
[tabs] the window draws no frames/[tabs] the window draws no frames	View Logs
main.DeveloperIdAppTests.test_download_prints_the_active_profile_only/ test_download_prints_the_active_profile_only	View Logs
stubs: /System/Library/Frameworks/Security.framework/Versions/A/Security has no stub/ Security has no stub	View Logs
stubs: CoreFoundation.tbd: install-name /System/Library/Frameworks/ CoreFoundation.framework/Versions/A/CoreFoundation, missing 1: ['_CFRetain']/ CoreFoundation, missing 1: ['_CFRetain']	View Logs
stubs: CoreFoundation.tbd: install-name /System/Library/Frameworks/ CoreFoundation.framework/Versions/A/CoreFoundation, missing 1: ['_log2']/ CoreFoundation, missing 1: ['_log2']	View Logs

^{Need help on this PR? Tag @codesmith-bot with what you need.}

[teamleaderleo]

Orphaned: no activity for 15 h, and no lane holds a lease on it. Adopted by the orphan sweep: merged feat-cmux-next in at cd8425e. A later pass queues it for the merge hub if it is reviewed, small and red only on base reds.

[teamleaderleo]

Orphaned: only the sweep's base merge since, and no lane holds a lease on it. The orphan sweep could not merge feat-cmux-next in: conflicts in Packages/macOS/CmuxNext/Tests/CmuxNextAgentPaneTests/AgentPaneStatusReplyShapeTests.swift. Listed for a lane to resolve.

[teamleaderleo]

Review (codex gpt-6-astra): SHIP at 6f3ed62

Exact-head review after the generated settings exports were applied. The prior stale-export finding is resolved; no actionable wrong-state, security, crash, or compile integration findings remain.

[teamleaderleo]

Review (codex gpt-6-astra): SHIP at 6f3ed62

Exact-head review after applying the generated settings exports. No actionable wrong-state, security, crash, or compile integration findings remain.

[teamleaderleo]

Review (codex gpt-6-astra): SHIP at a813e4d

Delta review of the one catalog-only commit: both machine-load-warning keys now have all 21 locales, valid stringUnit shapes/states, semantically faithful text, and no placeholder or line-break mismatches. No actionable wrong-state, security, crash, or compile integration findings.

[github-actions]

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4106459573901 (fe3152a7c4)

[github-actions]

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4106606310901 (08e8a12b4d)
• cmux NEXT nightly 1.0.0-nightly.4106809918401 (7deba738d3)