resend vs Substack MCP Server
resend is a plugin bundle for AI coding tools published by resend. Marketplaces we read that list it: 3 (Claude Code: claude-plugins-official, Claude Code: claude-plugins-community, Community GitHub marketplaces). Substack MCP Server is an MCP server published by conorbronsdon. Marketplaces we read that list it: 2 (Official MCP Registry, Community GitHub marketplaces). As of our marketplace pass on 2026-10-16. 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 |  resend |  Substack MCP Server |
|---|---|---|
| Claude Code: claude-plugins-official | Listed Version: 1.0.5 Forks (GitHub): 30 Stars (GitHub): 202 Not marked · First seen |
Not listed |
| Claude Code: claude-plugins-community | Listed Version: 1.0.4 Forks (GitHub): 30 Stars (GitHub): 202 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 1.3.0 Downloads/month (npm): 2 019 Downloads/week (npm): 310 Forks (GitHub): 9 Stars (GitHub): 43 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 | resend | Substack MCP Server |
|---|---|---|
| Marketplaces that list it (differs) | 3 (better) | 2 (worse) |
| Stars (GitHub) (differs) | 202 (better) | 43 (worse) |
| Forks (GitHub) (differs) | 30 (better) | 9 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (mcp.resend.com/mcp) | On your machine (@conorbronsdon/substack-mcp) |
| Transport (differs) | Streamable HTTP | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | Not published | 3, secrets among them: 1 |
| Parts of the bundle (differs) | 6 | 2 |
| Licence | MIT | MIT |
| Repository (differs) | github.com/resend/resend-skills | github.com/conorbronsdon/substack-mcp |
| Changes in the last 7 days | 2 | 2 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Responded 19 h ago | 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
resend
Agent skills for working with Resend to send and receive emails — email API integration, agent inbox, CLI, React Email components, and deliverability best practices. Includes the Resend MCP server.
Substack MCP Server
Substack drafts, Notes, analytics and consented subscribers. Long-form posts stay draft-only.
How to run each
resend As a Claude Code plugin
/plugin install resend@claude-plugins-officialSubstack MCP Server As a local MCP server: npm package
claude mcp add --env "SUBSTACK_PUBLICATION_URL=<YOUR_SUBSTACK_PUBLICATION_URL>" --env "SUBSTACK_SESSION_TOKEN=<YOUR_SUBSTACK_SESSION_TOKEN>" --env "SUBSTACK_USER_ID=<YOUR_SUBSTACK_USER_ID>" --transport stdio substack-mcp -- npx -y @conorbronsdon/substack-mcpRequires: SUBSTACK_PUBLICATION_URL, SUBSTACK_SESSION_TOKEN (secret), SUBSTACK_USER_ID
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Only resend 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
The marketplaces of resend publish no settings it asks for, so we do not compare settings.
What it can do: resend · What it can do: Substack MCP Server · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-official/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/blob/HEAD/.claude-plugin/marketplace.json. Data comes from public marketplace files in GitHub repositories of their authors. 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.