Slack vs Agent Inbox
Slack is a plugin bundle for AI coding tools published by Salesforce. Marketplaces we read that list it: 1 (Claude: knowledge-work-plugins). Agent Inbox is an MCP server published by clize.ai. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-19. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  Slack |  Agent Inbox |
|---|---|---|
| Claude: knowledge-work-plugins | Listed Version: 1.0.0 Forks (GitHub): 3 427 Stars (GitHub): 30 326 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.35.5 Downloads/month (npm): 472 Downloads/week (npm): 175 Forks (GitHub): 0 Stars (GitHub): 0 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Slack | Agent Inbox |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 30 326 (better) | 0 (worse) |
| Forks (GitHub) (differs) | 3 427 (better) | 0 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (mcp.slack.com/mcp) | On your machine (@clize/inbox) |
| Transport (differs) | Streamable HTTP | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 8 | Not a bundle |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/anthropics/knowledge-work-plugins | github.com/cooldk/clize-cli |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Responded 3 days ago, requires a key | no remote endpoint we check |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Slack
Slack integration for searching messages, sending communications, managing canvases, and more
Agent Inbox
A real email inbox for AI agents: human-approved sends, untrusted-by-default inbound.
How to run each
Slack As a Claude Code plugin
/plugin marketplace add anthropics/knowledge-work-plugins
/plugin install slack-by-salesforce@knowledge-work-pluginsAgent Inbox As a local MCP server: npm package
claude mcp add --transport stdio inbox -- npx -y --package @clize/inbox clize-mcp @clize/inbox --profile inboxCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only Slack has a remote endpoint we check. How we check endpoints
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: Slack · What it can do: Agent Inbox · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/knowledge-work-plugins/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.