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Move harness-sdk into ai as two experimental areas. A harness drives a coding-agent CLI someone else owns (Claude Code, Codex): run, stream ai.types events, steer, stop, approve tool calls, resume, fork, hand off, and open the CLI's own TUI. A workspace is where it runs: a local directory or a Vercel Sandbox microVM. - Errors gain an Error suffix and split into harnesses and workspaces errors modules; both bases subclass ai.AIError. - claude_code() and VercelSandbox() check their extras (claude-code, sandbox) at construction and raise ai.errors.InstallationError. - codex() refuses sandbox modes that cannot run inside a microVM, and codex transcripts name tool calls by native item kind. - Examples in examples/harnesses, plus the afk and deepysec apps. - Docs pages, reference pages, skill notes, and contributor guidance.
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vercel/vercel-py#415 merged to main (not released yet). Point the dev group and the afk and deepysec apps at main; uv.lock pins the commit. The merged API moved terminal I/O onto `InteractiveSession.stream`, an anyio byte stream that raises at end of stream instead of returning b"". Use it, and treat a raise in the ready-marker loops as the end.
Local.pty() started the holder with asyncio.create_subprocess_exec, and on Linux asyncio kills a still-tracked child when its event loop closes, so every named pty ended with the process that created it. The holder now daemonizes (--daemon) and releases its launcher over a pipe once its socket and pid file exist; Local.pty() waits for the launcher. Reading the pid file no longer races the holder's cleanup.
The no-extras job installs ai without extras and checks that claude_code() and VercelSandbox() raise InstallationError, and that import ai loads neither optional package. The compatibility job adds claude-agent-sdk at its minimum and latest versions, since the claude-code extra depends on its private transport API.
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Moves harness-sdk into
aias two experimental areas:ai.harnesses.experimentaldrives Claude Code and Codex (run, stream, steer, stop, approve, resume, fork, TUI), andai.workspaces.experimentalsays where they run (local or Vercel Sandbox).claude-codeandsandbox, checked at construction (InstallationError).import ailoads neither.examples/harnesses/, plusexamples/apps/afkandexamples/apps/deepysec(without its vulnerable fixture).basics/harnesses,basics/workspaces, and their reference pages.-m live); plainpyteststays offline.claude-agent-sdkin the SDK compatibility job.Proposal defaults taken: two top-level areas,
ToolCallkeeps its name, live tests stay out of CI.Verified: full CI check list, the live suite against real CLIs and sandboxes, and every harness example, afk, and deepysec end to end.
Before merge: vercel/vercel-py#415 is merged and
vercel-sandboxnow tracks itsmain; once it's released, set thesandboxextra's floor and drop the git pins. Rerunpytest -m sandboxon the merged API.