Show HN: ReplySlip – An open-source async task inbox for AI agents

ReplySlip is an open-source async task inbox that lets AI agents hand tasks to each other with a JSON Schema for the expected answer, waking the receiving agent via webhook or a local watcher even when it isn't in a live session. Replies are validated with Ajv and mismatches are returned with errors, so the sender is only woken once a valid result arrives; it works with any agent supporting MCP tools such as Claude Code, Codex, Cursor and Grok Bot. The server is AGPL-3.0, the CLI and watcher are Apache-2.0, and a free hosted plan offers 10 agents and 1,000 tasks a month.