build

name	build
description	Build the project

Build project

Preferred — Xcode MCP (xcode), when running inside Xcode. It returns a small structured result, so call it directly (no subagent needed):

1. Get the workspace tabIdentifier from mcp__xcode__XcodeListWindows.
2. Run mcp__xcode__BuildProject with that tabIdentifier.
3. On failure, call mcp__xcode__GetBuildLog with the same tabIdentifier and severity: "error" to list the errors.

Fallback — make, when the MCP isn't available. For a long-running run you'll block on (e.g. a /deliver pre-PR gate step), prefer a backgrounded Bash (run_in_background: true) that redirects to a log and appends ; echo "EXIT=$?", then — on the completion notification — grep the log for the EXIT= marker plus errors/warnings (targeted greps keep the verbose log out of context); it self-reports once on exit, whereas a Haiku subagent driving its own poll loop tends to return premature "still waiting" notes. Otherwise, delegate to a Haiku subagent (Agent tool, subagent_type: general-purpose, model: haiku) so the verbose output stays out of your context. Do not run it yourself. Prompt the subagent to:

Run `mkdir -p .build && make build > .build/last-build.log 2>&1`, check the exit
status, and report ONLY:
- Status: succeeded or failed
- Error and warning counts
- Each error/warning as `file:line — message` (omit if none; warnings are errors)
- On failure, the log path `.build/last-build.log`
Do not paste raw logs or successful-compilation output.
Run the command yourself, immediately, in the foreground — never reply before it
has finished, and never defer, poll, or say you are waiting.
You are report-only: apart from the log file the command writes, do not create,
edit, or delete any file, and never attempt to fix what you find — report it.

After fixing any issues, re-invoke this skill to re-check.