Function getEnvironmentOverrides

src/utils/shell/bashProvider.ts:208–253

(
      command: string,
    )

    },

    async getEnvironmentOverrides(
      command: string,
    ): Promise<Record<string, string>> {
      // TMUX SOCKET ISOLATION (DEFERRED):
      // We initialize Claude's tmux socket ONLY AFTER the Tmux tool has been used
      // at least once, OR if the current command appears to use tmux.
      // This defers the startup cost until tmux is actually needed.
      //
      // Once the Tmux tool is used (or a tmux command runs), all subsequent Bash
      // commands will use Claude's isolated socket via the TMUX env var override.
      //
      // See tmuxSocket.ts for the full isolation architecture documentation.
      const commandUsesTmux = command.includes('tmux')
      if (
        process.env.USER_TYPE === 'ant' &&
        (hasTmuxToolBeenUsed() || commandUsesTmux)
      ) {
        await ensureSocketInitialized()
      }
      const claudeTmuxEnv = getClaudeTmuxEnv()
      const env: Record<string, string> = {}
      // CRITICAL: Override TMUX to isolate ALL tmux commands to Claude's socket.
      // This is NOT the user's TMUX value - it points to Claude's isolated socket.
      // When null (before socket initializes), user's TMUX is preserved.
      if (claudeTmuxEnv) {
        env.TMUX = claudeTmuxEnv
      }
      if (currentSandboxTmpDir) {
        let posixTmpDir = currentSandboxTmpDir
        if (getPlatform() === 'windows') {
          posixTmpDir = windowsPathToPosixPath(posixTmpDir)
        }
        env.TMPDIR = posixTmpDir
        env.CLAUDE_CODE_TMPDIR = posixTmpDir
        // Zsh uses TMPPREFIX (default /tmp/zsh) for heredoc temp files,
        // not TMPDIR. Set it to a path inside the sandbox tmp dir so
        // heredocs work in sandboxed zsh commands.
        // Safe to set unconditionally — non-zsh shells ignore TMPPREFIX.
        env.TMPPREFIX = posixJoin(posixTmpDir, 'zsh')
      }
      // Apply session env vars set via /env (child processes only, not the REPL)
      for (const [key, value] of getSessionEnvVars()) {
        env[key] = value
      }
      return env
    },
  }
}