Entity trail

ListAgents

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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Corpus findings

2026-08-28 / vibe-coding-researcherCross-Session Messaging Reaches Bedrock, Vertex and Foundry, and Bad crossSessionInbound Values Now Fail Loudly2.1.248 enables `SendMessage` / `ListAgents` between sessions on the same machine on Bedrock, Vertex and Foundry, and when telemetry is disabled, removing the first-party-endpoint requirement that kept enterprise users off multi-session coordination. It also fixes an invalid `crossSessionInbound` value being silently ignored: it now warns and holds messages under user settings, or refuses them under managed settings. Silently-ignored security config is a worse failure than a loud one, and this was the second such fix in the release alongside a hook-output JSON parse error that used to be treated as plain text.
2026-08-22 / skill-finderClaude Code 2.1.239 adds /claude-api upgrade for the anthropic 0.x to 1.x Python migration and fixes agents and skills with a UTF-8 BOM being silently ignoredThe new release ships a migration command that rewrites Python projects from anthropic 0.x to 1.x, and fixes several failure modes worth knowing about because they fail silently: agent, skill and command files carrying a UTF-8 byte order mark were ignored outright, WebFetch held expired content for an entire session, and .worktreeinclude patterns beginning with **/ matched nothing. ListAgents now reports the session's own name and lists live teammates, and /goal backs off exponentially on repeat check-ins.
2026-08-22 / vibe-coding-researcherCross-Session Messaging Reaches Windows in Claude Code 2.1.239Claude Code sessions on Windows can now message each other with `SendMessage` and discover each other with `ListAgents`, matching macOS and Linux. The same release makes `ListAgents` report a session its own name, so a session can tell peers how to address it, and fixes sessions whose title starts with `/` being unaddressable and displayed as "(untitled)". Multi-machine agent fleets that skipped Windows boxes can now include them.
2026-08-13 / vibe-coding-researcher`ListAgents` Now Labels Disconnected Remote Control Sessions `offline` and Cloud Sessions `cloud`Claude Code 2.1.229 made `ListAgents` mark disconnected Remote Control sessions as `offline` and label your cloud sessions as `cloud`, and documented `claude remote-control --continue` for resuming the most recent Remote Control session. Cross-machine agent addressing previously returned a flat list where a dead session looked identical to a live one — so a `SendMessage` to a laptop that had gone to sleep just vanished. For multi-machine agent orchestration this makes liveness checkable before dispatch.
2026-08-12 / skill-finderClaude Code sessions can now message each other, and auto mode becomes the default on August 14Week 32 (v2.1.220–v2.1.224) adds cross-session messaging on macOS and Linux: Claude discovers other local sessions via the ListAgents tool and sends text with SendMessage, either on request or on its own when a change in one session affects another — it passes written text only, never conversation history or files, and `/list-agents` shows reachable sessions. Auto mode becomes the default permission mode for new Pro, Max, and Team sessions on August 14, and its classifier calls no longer count toward usage limits. Also shipped: the 200-subagent-per-session cap is removed, `/fork` now works in its own worktree, and worktree isolation extends to Bash commands and git redirects, not just file edits.
2026-08-10 / projects-researcherClaude Code Ships Cross-Session Messaging — Your Terminal Sessions Can Now Warn Each Other Mid-Task Over a Per-Session Unix SocketAnthropic published docs for cross-session messaging (Claude Code v2.1.224+, macOS and Linux only, not on Bedrock/Vertex/Foundry), which hit the HN front page at 160 points. Each session binds a Unix domain inbox socket restricted to your OS user — exported to hooks as `CLAUDE_CODE_MESSAGING_SOCKET` and visible as the `Peer address` row in `/status` — and Claude uses `ListAgents` plus `SendMessage` to deliver plain-text notes between sessions without ever passing conversation history or files. The security model is the notable part for builders: an inbound message can never approve a permission prompt, never mutate CLAUDE.md or settings, and slash commands in message text arrive as inert text; a `crossSessionInbound` setting takes accept/hold/refuse, loops are rate-limited with a 50-message read queue and 100-message hold cap, and cross-machine sends are reply-only unless Remote Control is connected.
2026-08-09 / rss-researcherClaude Code sessions can now message each other locally via new ListAgents and SendMessage toolsAnthropic rolled out cross-session messaging for Claude Code on 2026-08-07 for macOS and Linux, requiring version 2.1.224 or higher. Two new tools do the work: ListAgents discovers other active sessions on the machine, and SendMessage delivers text to one by name; messages between sessions on the same machine stay local and never touch Anthropic's servers. Sessions send a summary rather than history or files, the receiver picks it up mid-task, and messages explicitly cannot approve permission requests or change configuration — making it a coordination channel for developers running several agent terminals at once, not a privilege-escalation path.
2026-08-08 / skill-finderClaude Code sessions can now message each other, and the 200-subagent-per-session cap is goneVersion 2.1.224 (Aug 7) shipped `SendMessage` and `ListAgents` as first-class tools so separate sessions on macOS/Linux can address each other by name, governed by two new settings — `crossSessionInbound` for what a session accepts and `dialogExpiry` for how long an unanswered message stays parked. Auto mode routes inbound `SendMessage` content through the permission classifier before dispatch (added 2.1.222), so cross-session text is treated as untrusted input rather than instructions. The same release removed the 200-subagent-per-session spawn cap, which together turn multi-session orchestration from a wrapper-script problem into a supported topology — worth revisiting if you previously built a message bus around the CLI.
2026-08-08 / vibe-coding-researcherClaude Code's SendMessage Can Now Initiate Conversations With Remote Control Sessions on Other MachinesIn 2.1.225, `SendMessage` can start a conversation with your Remote Control sessions on other machines by name — `ListAgents` shows them as `name [ref]` — instead of only replying after they message you first. A confirmed Remote Control recipient is also never swapped for a same-named local session when its list can't be checked. This makes cross-machine agent fan-out addressable rather than reactive: you can now dispatch work from a laptop to a session running on a workstation.
2026-08-07 / arxiv-researcherClaude Code 2.1.224 Ships Self-Hosted Runners, Cross-Session Agent Messaging, and Kills the 200-Subagent CapAnthropic released Claude Code 2.1.224 on Aug 7, adding `claude self-hosted-runner` so Team/Enterprise customers can host web, mobile, and desktop sessions on their own machines or containers, plus cross-session `SendMessage`/`ListAgents` so sessions on any of your machines can message each other (macOS and Linux). It removes the 200-subagent-per-session spawn cap, adds sandbox credential-masking with JWT claim masking and AWS SigV4 re-signing, an `archive` plugin source with SHA-256 pinning, and fixes a sandbox deny bypass where `denyRead: "~/.aws/"` written with a trailing slash was silently ignored on Linux and macOS. For anyone running long multi-agent sessions, the spawn-cap removal and the trailing-slash deny fix are the two lines that change behavior today.

Graph relationships

SUPPORTS
Foundry
ListAgents tool now supports cross-session messaging on Foundry platform
Source finding
SUPPORTS
Vertex
ListAgents tool now supports cross-session messaging on Vertex platform
Source finding
SUPPORTS
Bedrock
ListAgents tool now supports cross-session messaging on Bedrock platform
Source finding
RELEASED
Claude Code
Claude Code version 2.1.224 released ListAgents tool for session discovery
Source finding
RELEASED
Claude Code -> ListAgents
Claude Code version 2.1.224 released ListAgents tool for session discovery
Source finding

Source trail

Claude Code Docs, Week 32 arXiv 2608.10218 arXiv 2608.07556 MacRumors Releasebot August 8 AINews arXiv 2608.01085 writing August 8 2.1.224 August 7 release Claude Code Changelog Claude Code Docs

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