---
title: "postbridge"
description: "Postal execution layer: quote, send, track, and prove physical letters from any AI agent."
canonical: https://agentpluginsdirectory.com/plugins/postbridge
last-updated: 2026-09-21
---

# postbridge
Postal execution layer: quote, send, track, and prove physical letters from any AI agent.
- Slug: postbridge
- Publisher: PostBridge
- Repository: https://github.com/PostbridgeAI/postbridge-agent-plugin
- Manifest: plugin.json
- Version: 0.1.0
- License: MIT
- Category (editorial): integrations
- Skills: 3 (send-letter, track-and-proof, wallet)
- MCP servers: 1 (postbridge)
- Stars: 0
- Repository created: 2026-08-06
- Repository last pushed: 2026-08-07
- Publisher type: Organization
- Listing: https://agentpluginsdirectory.com/plugins/postbridge
- Schema: https://agent-plugins.org/schemas/1.0.0/plugin.schema.json

## What postbridge does, in the publisher's words

Postal execution layer for AI agents: quote, send, track, and prove physical letters from any agent that supports the Agent Plugins open standard.

PostBridge turns a PDF (or generated document) into a physically mailed letter through print-and-mail providers, with carrier tracking and delivery proof. This plugin gives your AI agent that capability via PostBridge's hosted MCP server plus a set of Agent Skills playbooks.

> Built on the Agent Plugins specification > v1.0.0: a portable package format for Agent Skills and MCP servers.

From the project README, punctuation lightly normalized. Full text: https://raw.githubusercontent.com/PostbridgeAI/postbridge-agent-plugin/HEAD/README.md

## Skills

- send-letter: Send a physical letter through PostBridge's postal execution layer, quoting postage, validating addresses, and dispatching via print-and-mail providers. Use when the user asks to mail, post, or send a physical letter or document, or asks for a postage quote.
- track-and-proof: Track mailed letters and retrieve delivery proof through PostBridge. Use when the user asks for the status, tracking, delivery confirmation, or proof of delivery of a letter sent via PostBridge.
- wallet: Check the PostBridge workspace wallet balance and add funds. Use when the user asks about postage balance, credits, wallet status, or wants to top up before mailing.

Descriptions come from the frontmatter of each SKILL.md, punctuation lightly normalized.

## MCP servers

- postbridge: transport: streamable-http; url: https://api.postbridge.ai/mcp

Read from the plugin's own mcp.json. Environment variable names only, never values.