Claude Code 2.1.224 Lets One Session Message Another
Cross-session messaging landed on August 7, 2026. ListAgents and SendMessage move plain text between your sessions, and crossSessionInbound decides what actually arrives.
Tag: claude-code
106 posts · Page 4 of 11
Subtask vs Fork vs Background Agent in Claude Code: Which Delegation to Reach For
A named subagent starts cold, a fork inherits your whole conversation and shares your prompt cache, and a background agent is a second Claude Code session entirely. The trap is the naming: /fork stopped being the in-session fork at v2.1.212 and /subtask took over.
Auto Mode vs Manual Approval in Claude Code: What Each Mode Actually Allows Through
Manual gates every tool call on you. Auto mode gates them on a classifier with 32 built-in block rules. The mode that surprises people is neither: acceptEdits auto-approves rm, mv, and sed, not just file edits. Measured on Claude Code 2.1.123.
Fix: "Write(src/**) is not matched by file permission checks" in Claude Code
Claude Code only consults Edit(path) and Read(path) rules. A Write(src/**) allow or deny rule is accepted and then silently ignored. Use Edit() instead.
Fix: A Long MCP Tool Call Gets Auto-Backgrounded After Two Minutes Mid-Task
Claude Code 2.1.212+ moves any main-conversation MCP tool call still running at two minutes into a background task. Set CLAUDE_CODE_MCP_AUTO_BACKGROUND_MS=0 to stop it, raise the threshold to move the line, or send progress notifications from the server.
Fix: .mcp.json servers never start because the workspace is marked untrusted
Project MCP servers stuck at Pending approval are not misconfigured. Run claude interactively in the folder, accept the workspace trust dialog, then approve the servers.
Fix: a Windows path in your agent config silently turns into a tab, a newline, or a Chinese character
Folder names starting with t, b, n, r or u make a Windows path parse cleanly as JSON and still resolve wrong. Use forward slashes or double every backslash.
How to Run a Background Coding Agent That Auto-Commits and Opens a Draft PR When It Finishes
Two ways to make a coding agent land its own work: Claude Code 2.1.198+ background sessions commit, push, and open a draft PR from their worktree with no config, or wrap any agent CLI in a git worktree plus gh pr create --draft. Covers the worktree guardrails, the subagent-vs-session distinction, the GITHUB_TOKEN trigger trap, and why there is still no off switch.
How to Stream Nested Subagent Output From a Headless Claude Code Run
By default a headless Claude Code run emits only tool_use and tool_result blocks from its subagents, so the delegated reasoning is invisible. Pass --forward-subagent-text (Claude Code 2.1.211+) to get subagent text and thinking in the stream-json output, and demultiplex it by parent_tool_use_id.
Claude Code 2.1.219 Reopens Nested Subagents, Three Layers Deep
Version 2.1.219 raises the default subagent spawn depth from 1 to 3, adds a workflowSizeGuideline settings key, and ships a fail-closed sandbox network allowlist.