On Windows, `spawn()` with `detached: true` sets the
CREATE_NEW_PROCESS_GROUP flag in CreateProcess. In certain terminal
contexts — notably VSCode's integrated terminal (ConPTY), Windows
Terminal, and some MSYS2/Git Bash configurations — this flag conflicts
with the parent process group hierarchy and causes a synchronous EINVAL
from libuv, making *every* bash/async_bash/bg_shell command fail
immediately with `spawn EINVAL`.
The bg-shell extension already guards against this with
`detached: process.platform !== "win32"` (process-manager.ts:109),
but three other spawn sites were missed:
- `packages/pi-coding-agent/src/core/tools/bash.ts` (bash tool)
- `packages/pi-coding-agent/src/core/bash-executor.ts` (RPC executor)
- `src/resources/extensions/async-jobs/async-bash-tool.ts` (async_bash)
This commit aligns all spawn sites with the bg-shell pattern.
Additionally fixes two related issues:
1. `killProcessTree()` in shell.ts used `detached: true` on its own
`taskkill` spawn call — unnecessary and potentially problematic
in the same terminal contexts. Removed.
2. `killTree()` in async-bash-tool.ts used Unix-only
`process.kill(-pid)` with no Windows fallback. On Windows, negative
PIDs (process group kill) are not supported, so orphaned child
processes could survive timeout kills. Now uses `taskkill /F /T`
on Windows, matching the bg-shell and shell.ts implementations.
Includes a regression test that statically verifies no spawn site
uses unconditional `detached: true`, plus a smoke test confirming
the platform-guarded pattern works on all platforms.
Reproduction: Run GSD v2.42-v2.51 inside VSCode on Windows 11 with
Git Bash as the shell. Any bash tool call fails with `spawn EINVAL`.
The error is 100% reproducible and affects all shell operations
(bash, async_bash, bg_shell start).
Co-authored-by: Matt Haynes <matt@auroraventures.io>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Extract two self-contained subsystems from agent-session.ts (3,367 -> 2,737 lines):
- RetryHandler: auto-retry with exponential backoff, credential rotation,
and cross-provider fallback logic
- CompactionOrchestrator: manual/auto compaction, overflow recovery, and
extension integration for custom compaction providers
Also add shared getErrorMessage() utility to replace repeated
`err instanceof Error ? err.message : String(err)` patterns.
The extracted modules receive AgentSession state via dependency injection
interfaces, avoiding state duplication. AgentSession remains the coordinator
that delegates to these modules.
On Windows, process.cwd() returns backslash paths (C:\Users\name\...).
When these paths are injected into system prompts, worktree context
blocks, or tool results, the model copies them into bash commands.
Bash interprets backslashes as escape characters, silently stripping
them — producing invalid paths like 'C:Usersnamedevelopmentapp-name'.
This is not a regex hack — it's a proper cross-platform boundary:
- Filesystem operations (fs, path.join, spawn cwd) use native paths
unchanged. Node handles both separators correctly for I/O.
- LLM-visible text (prompts, tool results, extension messages) uses
toPosixPath() to normalize to forward slashes. C:/Users/name/...
is valid in Git Bash, WSL bash, PowerShell, and Node.js.
Changes:
- utils/path-display.ts: New toPosixPath() utility in pi-coding-agent
package (for system prompt) and shared extension module (for
extensions that can't import from the compiled package at dev time)
- system-prompt.ts: Normalize resolvedCwd before injecting into the
'Current working directory' line
- gsd/index.ts: Normalize all process.cwd() and originalBase paths in
worktree context blocks injected into the system prompt
- bg-shell/index.ts: Normalize cwd in tool result text (start, env
actions) that the model reads and may reference in commands
- path-display.test.ts: 9 regression tests covering toPosixPath
behavior and system prompt output verification. Includes a scanner
that fails if any Windows absolute paths with backslashes appear in
buildSystemPrompt() output.
Audit scope: Checked all process.cwd() usage across pi-coding-agent
and all bundled extensions. Filesystem-only paths (join, readFile,
spawn cwd, existsSync) are correct and left unchanged. Only paths
entering LLM text are normalized.
Replace manual binary header parsing (PNG/JPEG/GIF/WebP) in terminal-image.ts
with the native @gsd/native/image module, and replace photon-node (WASM) with
native N-API calls for image resize and format conversion.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Use the Rust-backed arboard clipboard (via @gsd/native/clipboard) for
text copy and image read, replacing the platform-tool shelling
(pbcopy/xclip/xsel) and @mariozechner/clipboard optional dependency.
OSC 52 is preserved as a fallback for SSH/mosh sessions. Linux Wayland
still falls back to wl-paste/xclip for image reads since arboard may
lack compositor access from a terminal.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
LLM-generated commands with `> NUL` create undeletable files on Windows
because Git Bash treats NUL as a literal filename. Rewrite NUL redirects
to /dev/null at all three bash spawn sites.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Vendor all 4 Pi packages (tui, ai, agent-core, coding-agent) from
pi-mono v0.57.1 as @gsd/* workspace packages under packages/. This
replaces the compiled npm dependency (@mariozechner/pi-coding-agent)
and patch-package workflow, giving direct source access for
modifications.
- Copy Pi source from pi-mono v0.57.1 into packages/
- Create workspace package.json + tsconfig.json for each package
- Rename ~240 imports from @mariozechner/pi-* to @gsd/pi-*
- Apply existing patches as source edits (setModel persist, VT input)
- Remove @mariozechner/pi-coding-agent dep and patch-package
- Update build pipeline to build packages in dependency order
- Add pi-upstream git remote for future selective syncing
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
