[sirenkovladd]

Reproduce on main: run any multi-line bash call (e.g. a heredoc script) and expand its card. Finished calls show JSON.stringify output with \n escapes; while the call streams, the card shows the raw rawInput JSON. Newlines never render as line breaks.

Cause: the expanded card only had a dedicated view for write text, codemode scripts and patches; everything else fell back to JSON text, which by spec escapes newlines inside strings.

Change:

• bash/powershell calls (new isBashToolName, matching lib/tool-names.ts conventions) with exactly { command, timeout? } now show the command text with real line breaks, finished and while streaming. Streaming input decodes the command string up to the last chunk (mid-escape cuts included); unparseable input, empty commands and calls with extra arguments keep the old view, so nothing is hidden.
• The header previews the command's first line plus (timeout Ns), as pi's TUI shows $ followed by the command and a timeout suffix; while streaming it shows the partial command instead of "Generating parameters" once it parses.
• Mirrored in demo/; topic note updated in docs/agents/sessions.md.

Checks: MessageView 51/51 (3 new tests), tsc --noEmit clean, eslint clean (main + demo configs). Full npm test: 2870/2873 — the 2 failures (rpc-manager-chat-only model naming, worktree listing) reproduce on clean main and are unrelated.

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Before

After

[agegr]

Thanks for this. I checked it against current main. Since #1324, a finished bash call already shows command as a row whose block keeps the real line breaks, so the finished-call half no longer reproduces (your "before" screenshot predates that). What is still wrong is the streaming phase: until toolcall_end, the card shows the raw JSON with \n escapes, while pi's TUI already renders the partial arguments.

I pushed a slimmer version on top. Instead of a bash/powershell name list, a second view and a hand-written partial-string decoder, the streamed input now goes through pi-ai's own parseStreamingJson() into the existing argument rows. That function produces the same partial arguments pi's TUI renders. It works for every tool whose arguments so far are flat (a multi-line command, a codemode script), and keeps the raw text otherwise. It also covers cases the decoder fell back to raw on or cut short: an invalid escape like \$, or timeout arriving before command.

The header keeps the plain command preview, and the timeout stays a row as on main. The demo uses partial-json, the parser parseStreamingJson() wraps. Tests and the sessions note are updated. I also checked it live with a mock provider streaming a bash call slowly.