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Add opt-in setting to paste clipboard images into agents with Ctrl+V - #14948
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughAdds a default-off setting for routing image-only pastes to Ctrl+V in local Claude Code or Codex panes. The paste handler checks agent activity, clipboard types, foreground ownership, and target locality. If routing does not succeed, regular paste continues. ChangesAgent image paste
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Sequence Diagram(s)sequenceDiagram
participant User
participant GhosttyNSView
participant TerminalAgentImagePasteRouting
participant Workspace
participant Clipboard
participant TerminalSurface
User->>GhosttyNSView: Paste image
GhosttyNSView->>TerminalAgentImagePasteRouting: Check setting and routing conditions
TerminalAgentImagePasteRouting->>Workspace: Prune stale PIDs and inspect agent context
TerminalAgentImagePasteRouting->>Clipboard: Inspect advertised pasteboard types
TerminalAgentImagePasteRouting->>Workspace: Check foreground ownership and local target
alt Routing conditions pass and key delivery succeeds
GhosttyNSView->>TerminalSurface: Send Ctrl+V
else Otherwise
GhosttyNSView->>TerminalSurface: Perform regular clipboard paste
end
Suggested reviewers: Merge Risk: 🔵 Low · up to Users in 11 locales may see fallback text for the new setting. Complete those translations before merging, or explicitly accept the limited localization gap. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new behavior is off by default and limited to eligible local agent panes. The review found no established security regression, but configuration authority and a narrow timing gap remain unverified. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (4 errors, 1 warning)
✅ Passed checks (20 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 27.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 33 functions across 13 files. (24 skipped: 24 unsupported.) Full details: Cmux Expensive Synchronous LoadExplanation The PR adds synchronous per-agent process probes to the Cmd+V action. Resolution Remove synchronous stale-PID pruning and per-record process-group probes from the paste action. Use a cached off-main agent/runtime index, such as Full details: Cmux Algorithmic ComplexityExplanation The new paste hot path repeatedly scans and sorts the panel's scalable agent-PID collection. Resolution Build one per-panel active-agent snapshot with a single pass over Full details: Cmux Swift Package BoundariesExplanation The pull request adds Resolution Create a small Full details: Cmux Full InternationalizationExplanation The PR adds four new app localization keys in Resolution Add translated, non-placeholder values for ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @web/data/cmux.schema.json:
- Around line 760-764: Add the
schemaDescriptions.terminal.agentImagePasteSendsCtrlV descriptionKey to the
agentImagePasteSendsCtrlV setting, and add its localized description for every
locale supported by the application.
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Packages/macOS/CmuxSettings/Sources/CmuxSettings/Keys/TerminalCatalogSection.swiftPackages/macOS/CmuxSettings/Tests/CmuxSettingsTests/SettingCatalogTests.swiftPackages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Navigation/CuratedSettingEntry+Default.swiftPackages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalSection.swiftPackages/macOS/CmuxSettingsUI/Tests/CmuxSettingsUITests/SettingsRowAnchorResolutionTests.swiftResources/Localizable.xcstringsSources/CmuxSettingsFileStore+SupportedPaths.swiftSources/CmuxSettingsJSONPathSupport.swiftSources/GhosttyNSView+ClipboardActions.swiftSources/SettingsSearchAliases.swiftSources/SettingsSearchIndex.swiftSources/TerminalAgentImagePasteRouting.swiftSources/TextBoxAgentDetection.swiftcmux.xcodeproj/project.pbxprojcmuxTests/TerminalAgentImagePasteRoutingTests.swiftskills/cmux-settings/references/all-keys.mdweb/data/cmux.schema.json
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Cmd+V with an image on the clipboard saves it to a temporary file and pastes the path. Claude Code and Codex can attach an image straight from the clipboard when they receive Ctrl+V, which is what users of those agents expect in other terminals. `terminal.agentImagePasteSendsCtrlV` (off by default) makes Cmd+V send Ctrl+V instead, but only when all of these hold; otherwise the existing paste runs unchanged: - Claude Code or Codex is live in the pane according to its hooks (`agentPIDKey`), not merely launched or restored earlier. - The clipboard advertises image data and no text, rich text, URL or file type. Only the type list is read on the main thread. - The pane is local. cmux ssh, detected SSH and Cloud panes keep the upload path, since the agent there reads another machine's clipboard. - The panel is not hibernated and the key is delivered. The setting is wired through the CmuxSettings catalog, cmux.json schema, Settings > Terminal row, search index and all-keys reference, with strings in all nine app locales. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
The first version trusted the pane's recorded agent PIDs, which can be stale or belong to an agent that isn't reading the keyboard, so a shell or tmux could receive a stray ^V. - Prune stale PIDs with `clearStaleAgentPIDs(panelId:)` before reading the agent context, as the TextBox submit-action cycle does. An agent killed without an exit hook no longer counts. - Require one of the pane's recorded Claude Code or Codex PIDs to be in the terminal's foreground process group (`foregroundProcessID()`, which is Ghostty's tcgetpgrp). A Ctrl+Z-suspended agent, or one in another tmux window, keeps the temp-path paste. - The workspace-level decision moves into `TerminalAgentImagePasteRouting` with the foreground group and getpgid injected, so both cases are tested against a real Workspace. The setting check still runs first. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @Resources/Localizable.xcstrings:
- Line 555542: Update the Korean description value so both references to
terminal panes use “분할 창” instead of “창”; preserve the rest of the translation
unchanged.
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Packages/macOS/CmuxSettings/Sources/CmuxSettings/Keys/TerminalCatalogSection.swiftPackages/macOS/CmuxSettings/Tests/CmuxSettingsTests/SettingCatalogTests.swiftPackages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Navigation/CuratedSettingEntry+Default.swiftPackages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalSection.swiftPackages/macOS/CmuxSettingsUI/Tests/CmuxSettingsUITests/SettingsRowAnchorResolutionTests.swiftResources/Localizable.xcstringsSources/CmuxSettingsFileStore+SupportedPaths.swiftSources/CmuxSettingsJSONPathSupport.swiftSources/SettingsSearchAliases.swiftSources/SettingsSearchIndex.swiftcmux.xcodeproj/project.pbxprojskills/cmux-settings/references/all-keys.mdweb/data/cmux.schema.json
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…gents # Conflicts: # Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/ConfigValidation/CmuxConfigSchema.generated.swift # cmux.xcodeproj/project.pbxproj
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Dogfood build of cmux DEV pr-14948-ea84ae68.app The link opens this exact commit in the cmux dev menu bar app. The build starts on each push and the page waits until it is ready; a newer push replaces it. It signs in against production, so Cloud or backend changes still need a tagged build with a development backend. Dogfood tours of
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Review at What was checked:
Nits:
The head has since moved to This PR adds a setting, so under the fix-vs-feature rule it goes to team review in #13742 rather than merging on green. |
Catch-up merge by scripts/ci/catch_up_pr.py (RFC #14631). Merged by scripts/merge-main.sh: origin/main at 478e323. Resolved conflicts: - Resources/Localizable.xcstrings: xcstrings key-level union - cmux.xcodeproj/project.pbxproj: union of added entries, then normalize-pbxproj.py - Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/ConfigValidation/CmuxConfigSchema.generated.swift: generate-cmux-config-schema.py, regenerated from the merged schema (both sides changed the schema) Catch-up-previous-head: ea84ae6 Catch-up-base: 478e323
Catch-up merge by scripts/ci/catch_up_pr.py (RFC #14631). Merged by scripts/merge-main.sh: origin/main at 1b06f84. Resolved conflicts: - Resources/Localizable.xcstrings: xcstrings key-level union - cmux.xcodeproj/project.pbxproj: union of added entries, then normalize-pbxproj.py Catch-up-previous-head: cb9613a Catch-up-base: 1b06f84
Resolved the settings reference conflict by keeping both sides. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
teamleaderleo
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Catch-up merge by scripts/ci/catch_up_pr.py (RFC #14631). Merged by scripts/merge-main.sh: origin/main at 5eda931. Resolved conflicts: - Resources/Localizable.xcstrings: xcstrings key-level union - cmux.xcodeproj/project.pbxproj: union of added entries, then normalize-pbxproj.py Catch-up-previous-head: b0d1f5d Catch-up-base: 5eda931 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Catch-up merge by scripts/ci/catch_up_pr.py (RFC #14631). Merged by scripts/merge-main.sh: origin/main at ea6e02b. Resolved conflicts: - Resources/Localizable.xcstrings: xcstrings key-level union - cmux.xcodeproj/project.pbxproj: union of added entries, then normalize-pbxproj.py - Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/ConfigValidation/CmuxConfigSchema.generated.swift: generate-cmux-config-schema.py, regenerated from the merged schema (both sides changed the schema) Catch-up-previous-head: 54bdee8 Catch-up-base: ea6e02b
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Pending product decision on the opt-in image paste behavior and dogfood evidence; auto-merge stays off. — Oolong g1 🌾 |
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Summary
With an image on the clipboard, Cmd+V in a terminal saves the image to a temporary file and pastes its path. Claude Code and Codex can attach an image straight from the macOS clipboard when they receive Ctrl+V, the way they work in other terminals, but cmux never sends it.
This adds
terminal.agentImagePasteSendsCtrlV, off by default, with a row in Settings > Terminal ("Paste Images into Agents with Ctrl+V"). When it's on, Cmd+V (and Edit > Paste) sends Ctrl+V to the pane instead of pasting a path, but only when all of these hold. Anything else runs the existing paste unchanged:WorkspaceContentView.terminalAgentContext+TextBoxAgentDetection) and requires the hook-reportedagentPIDKey. A launch command or restored snapshot alone doesn't count, because Ctrl+V sent to a shell after the agent exits would drop the image.TextBoxAgentDetectiongains a per-agentmatchesActive(context:), next to the existingsupportsActiveAgentPrefixes.Workspace.clearStaleAgentPIDs(panelId:)(as the TextBox submit-action cycle does), so an agent killed without an exit hook no longer counts. Then one of the pane's recorded Claude/Codex PIDs must be in the terminal's foreground process group (TerminalSurface.foregroundProcessID(), which is Ghostty'stcgetpgrp). A Ctrl+Z-suspended agent, or one in another tmux window, keeps the temp-path paste instead of sending ^V to the shell or tmux. Limit: a child the agent runs in its own process group, such as its external editor, shares that group and still counts.resolvedImageTransferTarget == .local). For cmux ssh, detected SSH and Cloud panes the agent would read another machine's clipboard, so they keep the upload path.sendNamedKey("ctrl+v")fails, the regular paste runs.Ctrl+V goes through
TerminalPanel.sendNamedKey, so Ghostty encodes it for the pane's active keyboard mode like any typed key. The checks run in order of cost: the setting first, then agent context, then the pasteboard type list, then target resolution. With the setting off,paste(_:)does oneUserDefaultsread before its existing code.Wiring: CmuxSettings catalog key, cmux.json section mapping and supported paths,
web/data/cmux.schema.json(plus the regenerated embeddedCmuxConfigSchema.generated.swift) withdescriptionKey: schemaDescriptions.terminal.agentImagePasteSendsCtrlV, Settings row, curated and app search index entries, andskills/cmux-settings/references/all-keys.md.Related but separate: #11314 (Cmd+C/Cmd+V routing), #7046 and #5586 (remote image upload paths). This PR changes neither routing nor uploads.
Testing
cmuxTests/TerminalAgentImagePasteRoutingTests.swift(wired with./scripts/sync-test-wiring). It checks the decision matrix: setting on or off (off never evaluates the agent, pasteboard or target), live Claude/Codex vs other or exited agents, image-only vs image plus each text, URL or file type, and local vs remote or Cloud targets.stalePIDWithoutAnExitHookKeepsTheTempPathPaste,liveAgentOutsideTheForegroundGroupKeepsTheTempPathPasteandliveForegroundAgentInAWorkspaceSendsCtrlVrun the workspace-level decision against a realWorkspacewith recorded PIDs.foregroundCheckMatchesTheAgentsProcessGroup,agentOutsideTheForegroundKeepsTheTempPathPasteandonlyClaudeCodeAndCodexPIDsCountForTheForegroundCheckcover the injected foreground predicate.SettingCatalogTests.agentImagePasteSendsCtrlVDefaultsOffand the new row path toSettingsRowAnchorResolutionTests.python3 scripts/verify-local.py(swift-syntax, xcstrings, localization, project, config-schema, test-wiring, package-groups, feature-flags: 8/8 pass), plustests/test_cmux_schema_parity.pyandtests/test_cmux_settings_supported_paths.py. CI on bd8600e (rebased onto Add terminal.confirmUnsafePaste to confirm unsafe pastes in a window sheet #14951) is green: the app compiled, all ofAgent image paste routing(including the six stale-PID and foreground tests above) ran and passed inapp-host unit tests (changed suites), andagentImagePasteSendsCtrlVDefaultsOffpassed inswift-package-tests.claudeorcodex(the image should attach) and in a plain shell pane (a temp path should paste, as before).Localization audit: four new keys in
Resources/Localizable.xcstrings(the row title, the on and off subtitles, and the search alias), each with all nine app locales.scripts/localization_catalog.py checkreports 0 parity errors andscripts/lint-xcstrings.pypasses. The schema description has adescriptionKeywith a translated entry in all 20 web locales (web/messages/*.json), added in ea84ae6 after review. The Korean subtitle uses 분할 창 for panes.Checklist
— Glasswren g1 🎲
run: run_paste_improvements_20260927_d07ca05d
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