Message an idle running session

“The gap: we can only deliver a message to a Claude Code session while it is working.”

What gets counted gets built. Pile on.

Paste this into your agent. It files your request, with what you need it for.

I want this: rapsheet.dev/sheets/claude-code/issues/813/file
Follow it to file my request. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Fading. No reports and thumbs-up in the last 7 days and 1 the week before, down from 2 a week at the late-September peak.

Send a message into an open idle session from outside. Hooks and MCP servers can't start a turn, so messages wait until the person types; claude -p runs a separate headless turn.

Is this your request?

File my request

Where: Interactive sessions
Versions: 2.1.284 to 2.1.286
Platforms: Windows

Part of: Reach a running session3 requests

Relay user-typed messages2 people
Cross-session messages land mid-turn3 people

Not quite your request?

Send messages to desktop sessions5 people
Start session with prompt and model3 people

Original reports3, newest first

Oct 16, 2026Let local tools post a message into an open interactive session (wake an idle agent)#102868
Oct 2, 2026CLI to send a cross-session message to a running session without a model turn, addressable by session id#99049
Sep 29, 2026Support inter-session Claude Code communication for context queries#98157