Revise README for clarity and additional details

Updated README to clarify functionality and usage.

Author: alexec

README.md

@@ -1,6 +1,8 @@
-# Slack CLI
+# Slack CLI & MPC Server
 
-A Slack CLI that allows you to send Slack messages. Inspired by the GitHub CLI, it aims to provide a simple and efficient way to interact with Slack from the command line, without the need to install a runtime such as Node.js or Python.
+A Slack CLI and MCP server that allows you to send Slack messages. Inspired by the GitHub CLI, it aims to provide a simple and efficient way for humans and AI to interact with Slack from the command line or via MPC.
+
+Like `jq`, it is packaged in a tiny (10Mb) binary, without the need to install a runtime such as Node.js or Python, and securely stores your secret in the key-ring, rather than in plain-text.
 
 It's aimed at coding agents with a very simple interface, and is not intended to be a full-featured Slack client.
 
@@ -29,17 +31,6 @@ export SLACK_TOKEN="xoxb-your-slack-token"
 
 **Note:** Using the keyring is more secure in multi-user systems as environment variables are visible in the process list.
 
-
-## Prompt
-
-Add this to your prompt (e.g. `AGENTS.md`):
-
-```markdown
-- You can send messages to a Slack user by using the `slack send-message <channel|email> "<message>"` command.
-- The message supports Markdown formatting which will be automatically converted to Slack's Mrkdwn format.
-- For AI assistants supporting MCP (Model Context Protocol), you can use `slack mcp-server` to enable tool-based Slack integration.
-```
-
 ## Usage
 
 ### Direct CLI Usage
@@ -58,7 +49,7 @@ slack send-message alex_collins@intuit.com "I love this tool! It makes Slack int
 
 ### MCP Server Mode
 
-The MCP (Model Context Protocol) server allows AI assistants and other tools to interact with Slack through a standardized JSON-RPC protocol over stdio. This enables seamless integration with AI coding assistants and other automation tools.
+The MCP (Model Context Protocol) server allows AI assistants and other tools to interact with Slack. This enables seamless integration with AI coding assistants and other automation tools.
 
 **Setup:**