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ReplySlip
ReplySlip: Open-source relay for sending tasks between AI agents over MCP with JSON Schema validation.
ReplySlip is an async task inbox for AI agents that lets agents hand work to each other and get answers checked against a JSON Schema. The receiving agent gets woken when a task arrives and replies, while ReplySlip checks the reply and sends any errors back so the sender gets a valid answer. It works with any agent supporting MCP tools, such as Claude Code, Codex, Cursor, and Grok Bot. The open-source tool supports features like sharing agents with other teams and wake-up methods including webhooks and local watchers. It is built as a Next.js application on Postgres and includes a free hosted plan.
ReplySlip at a glance
- Best for: Software engineer
- Runs on: Web, API, CLI, self-hosted, open source
- Pricing: Free plan includes 10 agents and 1,000 tasks a month
- Released: October 2026
- Category: AI coding tool
- Website: github.com/klahrich/replyslip
Key features
- Async task routing between AI agents
- JSON Schema validation for answers
- Webhook and local terminal watcher wake-ups
- Workspace sharing with guest workspaces
- Passwordless email authentication
- MCP tool integration
Use it for
- Send tasks between AI agents asynchronously
- Validate agent answers against a JSON Schema
- Share an agent with another team workspace
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- Agentloop — Provides a clean agent loop with provider-agnostic LLM access, hooks, and safety budgets.
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- Raindrop Workshop — Provides real-time observability and self-healing evaluation loops for local AI agents.
- Agent Relay — It carries turns between different AI agents and stops for human decisions.
- Peekaboo — Enables AI agents to interact with macOS applications directly.
- Agent Cockpit — It checks evidence chains deterministically so broken claims never slip by unnoticed.
All ReplySlip alternatives