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feat(web): configure custom Open in applications and file defaults - #73

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adampeterhiggins merged 1 commit into
mainfrom
ah/custom-open-in-apps
Sep 30, 2026
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adampeterhiggins merged 1 commit into
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ah/custom-open-in-apps

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File links always opened T3's viewer, and the Open in picker only offered detected editors. Settings → Integrations → Open in now lets each environment add, edit, and remove applications, choose a file-link default, and override it by extension. For example, configure open with -a and Typora on separate argument lines, then route .md files to Typora.

Configured applications appear in workspace Open in and file Open with menus. Commands run on the environment hosting the file with the path passed as a separate argument; application launches strip line/column suffixes. Removing an application clears its extension rules and resets its default to T3. The file-link menu keeps an explicit Open in T3 file viewer action.

Validation: 224 focused tests passed, targeted lint passed, and web/server/contracts/desktop/mobile typechecks passed. A real web-client pass verified adding, editing, persistence across reload, extension routing, default selection, removal cleanup, and both menus. Clicking a Markdown link launched a harmless recording application with the expected path; a text link opened T3's viewer.

Surface coverage: web and desktop share the settings and file actions; mobile retains its native viewer. Launching is provider-independent. Typed contracts carry application IDs and settings. Remote menus offer custom applications on the environment host alongside editors supporting SSH links. Native mobile and Electron were not separately launched.

Before/after settings screenshots and the chat file menu screenshot are uploaded to the draft evidence release. Repository maintainers can download before.png, after.png, and file-menu.png there. Evidence files are not committed.

Model: GPT-6.1-Sol. Harness: Codex in T3 Code.

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