capx café

Name: capx café
Author: vb-tyagi

by vb-tyagiversion 0.1.3i★ –iRuns on your computer

Registry nameio.github.vb-tyagi/capx-cafe

Install

Overview

Description from the maker (original English)

Agent-native X (Twitter) posting as one MCP server; every post clears a server-side guardrail.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Marketing & social media
You need to fill in: CAPX_CHOKEPOINT_URL, CAPX_EMAIL

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: CAPX_CHOKEPOINT_URL, CAPX_EMAIL, CAPX_LANE, X_CLIENT_ID

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "capx-cafe": {
      "command": "npx",
      "args": [
        "-y",
        "capx-cafe"
      ],
      "env": {
        "CAPX_CHOKEPOINT_URL": "your-value",
        "CAPX_EMAIL": "your-value",
        "CAPX_LANE": "your-value",
        "X_CLIENT_ID": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add capx-cafe --env CAPX_CHOKEPOINT_URL=your-value --env CAPX_EMAIL=your-value --env CAPX_LANE=your-value --env X_CLIENT_ID=your-value -- npx -y capx-cafe

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "capx-cafe": {
      "command": "npx",
      "args": [
        "-y",
        "capx-cafe"
      ],
      "env": {
        "CAPX_CHOKEPOINT_URL": "your-value",
        "CAPX_EMAIL": "your-value",
        "CAPX_LANE": "your-value",
        "X_CLIENT_ID": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "capx-cafe": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "capx-cafe"
      ],
      "env": {
        "CAPX_CHOKEPOINT_URL": "your-value",
        "CAPX_EMAIL": "your-value",
        "CAPX_LANE": "your-value",
        "X_CLIENT_ID": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

CAPX_CHOKEPOINT_URL required env
URL of the hosted capx chokepoint that enforces the server-side guardrail on every post
CAPX_EMAIL required env
Whitelisted user email used to authenticate to the chokepoint
CAPX_LANE env
Connection lane: 'byo' (bring your own X app) or 'capx-app' (capx-managed app)
X_CLIENT_ID env
X (Twitter) OAuth client ID; required only on the BYO lane

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account vb-tyagi, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Marketing & social mediai

More stars than 0% of the other 2972 servers in this category
Published to the registry more recently than 31% of the other 2972 servers in this category
Basic checks equal to or better than 100% of the other 2972 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is capx café safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: CAPX_CHOKEPOINT_URL, CAPX_EMAIL

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.3) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: MCP YouTube Transcript, Google Analytics MCP, BibiGPT YouTube Video Summarizer

Alternatives

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

capx café

The safe way to let your AI run your X.

One MCP server. Your X token never touches the agent — and every post clears an enforced guardrail before it ships.

*The guardrail, live — every verdict above is produced by the real chokepoint code (pnpm demo replays it).*

capx café is an agent-native X poster that installs as one MCP server into any coding agent (Claude Code /

Cursor / Codex / Windsurf). A whitelisted user connects their X account once; after that they create /

schedule / post from inside their agent session. The whole product rests on one security thesis: the X

token, the guardrail (casserole), and the send are one inseparable server-side unit — the agent on

your laptop only ever holds a short-TTL session handle, never the token. That's why it structurally can't be

prompt-injected into tweeting a scam. "The AI writes; casserole decides what ships."

Why it's different

Every other "let your AI post" tool has the same flaw: to let an agent post, you paste your X token into a plaintext config right next to an autonomous agent that reads untrusted web pages, issues, and code. One prompt-injection and your account tweets a scam. capx café is the only one that structurally can't be.

🔒 Your X token never touches your machine. OAuth completes on capx café's hosted callback; the token lives encrypted in a server-side vault. Your agent holds only a short-TTL, revocable session handle.
🛡️ casserole — a *deterministic (non-AI)* six-layer guardrail — runs server-side at the only door to X and checks every post. A blocked post never even decrypts your token (proven by an adversarial test suite).
🔗 The token, the guard, and the send are one unit. Skip the plugin and call the server directly — you still hit the guard. The client's checks are cosmetic; the server's are load-bearing.
✍️ capx generates nothing. *Your* agent's model writes; capx ships what clears the guard.

→ Full threat model, architecture & the "what we can/can't see" table: [docs/SECURITY.md](docs/SECURITY.md)

How it works

flowchart LR

subgraph M["🖥️ your machine · untrusted"] A["agent model writes the draft"] S["capx skills"] C["capx MCP client holds a session handle · NO token"] end subgraph K["🔒 capx chokepoint · hosted · AGPL-3.0"] AD["admission allowlist · kill-switch"] CAS["casserole 6-layer guardrail"] V["vault the token lives here"] XA["x-adapter the only egress"] end X["🐦 X · /2/tweets"] A --> C S --> C C -->|"short-TTL handle crosses — never the token"| AD AD --> CAS CAS -->|PASS| V --> XA --> X CAS -.->|blocked / held| C

The token, the guardrail, and the send live together behind a trust boundary; your agent can only *ask*.

The guardrail: casserole

Six deterministic layers on every post. Worst result wins — pass / rewrite / hold / block — and a blocked post never even decrypts the token.

flowchart TD

D["draft"] --> AD{"admitted? allowlisted · not killed"} AD -->|no| R["rejected"] AD -->|yes| CAS["casserole L1 eligibility · L2 rate · L3 anti-slop L4 authenticity · L5 kill-switch · L6 audit"] CAS --> VER{"verdict"} VER -->|block| B["blocked — never sent 🔒 token never decrypted"] VER -->|hold| H["held for your review"] VER -->|rewrite| RW["ask the agent to fix"] VER -->|pass| SEND["vault → x-adapter → X ✅"]

60-second quickstart

npx -y capx-cafe          # runs the MCP server — add it to your agent's MCP config

Then, inside your agent:

"connect my X account"              → opens a browser once; the token stays on the server

"post: shipping the thing today" → clears casserole, or tells you exactly why not "turn my last week of commits into a build-in-public thread" → drafts + queues it

Set CAPX_EMAIL (your whitelisted email) and, for the BYO lane, X_CLIENT_ID (your own X app) in ~/.capx/config.json or your agent's MCP env. A guided setup page hands you the exact callback URL to paste.

Install matrix

Agent	How
Claude Code	`/plugin marketplace add vb-tyagi/capx-cafe` → `/plugin install capx-cafe` (MCP + slash commands + skills)
Cursor	add to `.cursor/mcp.json`; skill rules in `plugins/capx-cafe/adapters/cursor/`
Codex	add to your MCP config; prompt pack in `plugins/capx-cafe/adapters/codex/`
Windsurf	add to MCP config; workflows in `plugins/capx-cafe/adapters/windsurf/`
Any MCP agent	point it at `npx -y capx-cafe`
Docker Desktop	`docker mcp catalog pull ghcr.io/vb-tyagi/capx-catalog:latest` → MCP Toolkit → enable capx café

What your agent can do

Tool	What it does
`connect_x`	One-time browser OAuth — the token lands in the server vault, never on your machine
`post_now`	Post now (clears casserole first). Supports reply-chains and media
`preview`	Dry-run a draft through the guardrail without sending — pass / hold / block + why
`audit`	The durable record of what capx posted or attempted on your behalf, and its state
`create_loop` · `list_loops` · …	Scheduled posting — a queue you wrote, sent on a schedule, laptop-off
`upload_media`	Stream a local image/video to X and attach it (media you made with your own tools)
`whoami`	The connected account + its status

Skills — your work becomes your content

capx lives inside a *coding* agent, so it has what no social scheduler does: your repo, commits, PRs, releases. Skills turn that into posts — automatically, and always through the guardrail.

flowchart LR

The self-refilling content engine: you code → commits accrue → the loop drains as it posts → gap-alert tops it up from the *new* commits. Your normal work *is* the pipeline.

🏆 build-in-public · ship-note · changelog-thread · repurpose (blog/README → thread) · launch-thread · til · fix-note
voice-match (sound like you) · draft-review (lint against the guard) · thread-builder · hook-rewrite
best-time · cadence-planner · gap-alert · audit-trail · connection-health · quickstart · self-host-guide
Media directors — image-director, video-director, prompt-engine, model-guide: capx runs no models; it guides *your* image/video tools (higgsfield, fal, kling, …) and uploads the result. casserole guards your caption; you own the media.

*One canonical SKILL.md per skill, generated for all four agents. capx never writes the content — it makes good content easy and stops bad content regardless of which skill produced it.*

Two lanes

BYO — bring your own X developer app. You're X's customer and pay X directly — since Feb 2026 that means pre-loading credits (no free X tier for new apps) at ~$0.015/post, $0.20 if the post contains a link. Free on capx café's side; heavy users can self-host the identical image.
capx-app (creator lane) — post through capx café's shared X app, no developer account needed. Opening as a paid beta (waitlist): Short $5 / Tall $15 / Grande $35 monthly tiers + top-up packs, quotas enforced server-side at the gate. Full sheet + the math: [docs/ECONOMICS.md](docs/ECONOMICS.md) · policy posture: docs/X-COMPLIANCE.md.

Self-host

The chokepoint is open source (AGPL-3.0). Run the identical image with your own X app, keys, database, and domain — CAPX_DEPLOY_MODE=self-host, zero telemetry to capx. See the self-host-guide skill and docs/HANDOFF.md.

Licensing

MIT for the client and everything it bundles (apps/capx-mcp, core, config, platform-client) plus skills & docs. AGPL-3.0 for the server half (the chokepoint + casserole/captain/counter/canteen/ chef). Full map: [LICENSING.md](LICENSING.md).

Status

Private alpha, whitelist-only. The first real post shipped 2026-07-19 — guardrail-cleared, token never on the machine. Not yet open for public signups.

Dev

Node ≥ 22.6 (TypeScript runs natively via --experimental-strip-types — no build step). pnpm run verify = unit tests across packages / services / apps + tsc. Contributions accepted under the project CLA.

capx café · security · architecture · license

capx café

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Marketing & social mediai

Common questions

Alternatives

MCP YouTube Transcript

Google Analytics MCP

BibiGPT YouTube Video Summarizer

README from the maker

capx café

The safe way to let your AI run your X.

Why it's different

How it works

The guardrail: casserole

60-second quickstart

Install matrix

What your agent can do

Skills — your work becomes your content

Two lanes

Self-host

Licensing

Status

Dev