Substack CLI + 26-tool MCP server. Your IDE drafts replies via propose_reply. No API keys.
Substack CLI + 26-tool MCP server. Your IDE drafts replies via propose_reply. No API keys. Exposed over MCP by the substack mcp server, that capability becomes something an assistant can invoke while it works, not something you go and do afterwards.
Posts, notes, comments, replies, reactions, restacks, recommendations, search, profiles, feeds, automations, MCP server, Textual TUI. One Python install, one binary, MIT licensed.
The server ships on PyPI as substack-ops, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.
Everything the assistant can do here goes through one of these:
get_unanswered_comments — Returns the worklist: comments where you have not yet replied (any depth)propose_reply — Dry-run only. Returns a token + payload preview. No write.confirm_reply — Posts a previously-proposed reply by token. Idempotent via dedup DB. Token TTL 5 minYou will need 2 environment variables: ANTHROPIC_API_KEY, OPENAI_API_KEY. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. Substack's toolset — get_unanswered_comments, propose_reply, confirm_reply — is a fair guide to whether it matches your workflow. It is maintained by 06ketan; worth a glance at recent repository activity before you build anything load-bearing on it.
We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.
| Tool | What it does |
|---|---|
| get_unanswered_comments | Returns the worklist: comments where you have not yet replied (any depth). |
| propose_reply | Dry-run only. Returns a token + payload preview. **No write.** |
| confirm_reply | Posts a previously-proposed reply by token. Idempotent via dedup DB. Token TTL 5 min. |
{
"mcpServers": {
"substack-ops": {
"command": "uvx",
"args": ["substack-ops"],
"env": {
"ANTHROPIC_API_KEY": "your-value",
"OPENAI_API_KEY": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| ANTHROPIC_API_KEY | Credential the server authenticates with. | Yes |
| OPENAI_API_KEY | Credential the server authenticates with. | Yes |
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Local repository surgery — status, diffs, commits, branches and history for any repo on disk.
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