# eXcalibur Posts Manager

> An AI-assisted content management system for your X (Twitter) posts, built on eXcalibur MCP. Write block-structured drafts, refine flagged passages with AI, schedule and repost, keep a snippet library, and publish to X.

eXcalibur Posts Manager is a single-page web app (the CMS) backed by eXcalibur
MCP, a Model Context Protocol server. Humans use the web UI; AI agents can call
the same MCP tools directly. The operator holds the X API credentials in an
encrypted vault; patrons pay per published post rather than supplying their own
keys.

## Connecting an agent

The web app is one client of an MCP server, and an agent can call the same tools directly.

- MCP endpoint (streamable HTTP, no account, no API key): https://excalibur-mcp.fastmcp.app/mcp
- Claude.ai or Claude Desktop: Customize → Connectors → Add custom connector → paste the endpoint; leave the OAuth fields blank
- Claude Code: `claude mcp add --transport http excalibur https://excalibur-mcp.fastmcp.app/mcp`
- Cursor (`.cursor/mcp.json`): `{"mcpServers": {"excalibur": {"url": "https://excalibur-mcp.fastmcp.app/mcp"}}}`
- VS Code (`.vscode/mcp.json`): `{"servers": {"excalibur": {"type": "http", "url": "https://excalibur-mcp.fastmcp.app/mcp"}}}`
- MCP Registry: `io.github.lonniev/excalibur-mcp`

First connection:

1. Ask the person for their Nostr npub (npub1…). Never ask for an nsec.
2. `excalibur_request_npub_proof(patron_npub=…)` sends them a Nostr direct message. They reply from their Nostr client; then call `excalibur_receive_npub_proof(patron_npub=…, nonce=…)` once with the nonce the request returned. Your connection then holds the npub: pass only `npub` on every paid call.
3. `excalibur_check_balance`. If it is empty, `excalibur_purchase_credits` returns a Lightning invoice for the person to pay, and `excalibur_check_payment` confirms it.

`excalibur_service_status` and the `excalibur_oracle_*` tools need no proof. `excalibur_check_price` previews a fare. The server's own MCP `instructions` repeat these steps.

## What is on this site

- **Composer** — a block editor for X posts. Each block is a line/paragraph
  you can reorder; X has no rich text, so "bold/italic/monospace" render as
  Unicode Mathematical Alphanumeric Symbols, dividers as box-drawing rules,
  and an emoji/symbol picker inserts glyphs at the cursor. What you see is
  what posts.
- **Refine** — flag a region of a draft and the server rewrites it against
  your voice profile and banned constructions. The operator's model-router
  key stays vaulted and never reaches the browser; the AI cost is metered as
  a Lightning fare.
- **Posts** — drafts, scheduled, sent, and archived. Repost a sent post in
  one click.
- **Snippet library** — save reusable openings, footers, and CTAs under your
  npub (Neon-backed, follows you across devices); star favorites to get
  one-click chiclets in the editor.
- **Wallet** — pre-fund and check your satoshi balance; preview any tool's
  price before committing.
- **Profile** — display name, avatar, and Nostr relays stored in your Nostr
  kind-0 metadata; theme selection (dark by default); build, license, patent,
  and version transparency.

## Tools

- Posting: `excalibur_post_tweet`, `excalibur_post_tweet_image`.
- Stored posts: `excalibur_create_post`, `excalibur_get_post`,
  `excalibur_list_posts`, `excalibur_update_post`, `excalibur_delete_post`.
- Snippet library (free, proof-gated, owner-scoped): `excalibur_list_snippets`,
  `excalibur_save_snippet`, `excalibur_delete_snippet`.
- Server-side AI refine (metered): `excalibur_refine_post_region`.

## Payments and identity

- Identity is a Nostr keypair (npub). There is no account, no email, no subscription and no KYC.
- A connection proves its npub with a Nostr DM challenge, or by signing each request with the npub's key (NIP-98).
- Tool calls debit a balance of sats, pre-funded with a Bitcoin Lightning invoice.
- Each operator sets its own per-tool prices. Monetization is the Tollbooth DPYC™ protocol: https://tollbooth-dpyc.com

## License, patent, and trademarks

- Source is open under the Apache License 2.0. The services built on it are private commerce: each operator sets its own tolls.
- Patent Pending — US Provisional Application 64/045,999 (Tollbooth DPYC Economic Architecture).
- DPYC™, Tollbooth DPYC™ and Don't Pester Your Customer™ are trademarks of Lonnie VanZandt.

## Links

- Web app: https://excalibur.tollbooth-dpyc.com
- MCP endpoint: https://excalibur-mcp.fastmcp.app/mcp
- Source: https://github.com/lonniev/excalibur-mcp
- Every service on the network: https://mcps.tollbooth-dpyc.com
- Tollbooth DPYC™ (monetization SDK and network): https://tollbooth-dpyc.com
- DPYC community and patent filings: https://github.com/lonniev/dpyc-community
- DPYC Oracle (free community concierge): https://dpyc-oracle.fastmcp.app/mcp