Abyssfall: Operation Sunken Crown MCP

This official MCP server provides tools for game information lookup, newsletter signup with double opt-in confirmation, and merchandise reservations for the action-adventure co-op platformer Abyssfall: Operation Sunken Crown.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-07Operated by Shark Byte Media

MCP endpoint (Streamable HTTP)

https://www.abyssfallgame.com/mcp

Vendor documentation

What its tools do

6 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Can change data (2)

subscribe_newsletter
preorder_merch

6 of 6 have a description · 6 of 6 declare behavior hints · 0 of 2 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

Passed Endpoint answered the live check · Nov 7, 2026, 9:11 AM UTC
Passed Official MCP Registry namespace is tied to abyssfallgame.com · Nov 7, 2026, 6:23 AM UTC
Passed Endpoint is on the registry namespace domain · Nov 7, 2026, 6:23 AM UTC
Availability 1 of 1 checks passed in 30 days

What you can do with it

Lookup game information
Sign up for the official newsletter
Reserve merchandise

Source and maintenance

Vendor evidenceRegistry 1.1.0

mcp-registry: com.abyssfallgame/mcp@1.1.0 Project website

Protocol and capabilities

Server: abyssfall 3.4.2
MCP protocol negotiated in check: 2025-11-25
Tools: 6 advertised
Resources: 1 advertised
Resource templates: 0 advertised
Prompts: 0 advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": true
  },
  "logging": {},
  "prompts": {
    "listChanged": true
  },
  "resources": {
    "subscribe": false,
    "listChanged": true
  },
  "extensions": {
    "io.modelcontextprotocol/ui": {}
  },
  "experimental": {}
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Official agent interface for Abyssfall: Operation Sunken Crown (Shark Byte Media). Facts come from the owner-verified knowledge file; anything not stated there is unannounced. subscribe_newsletter triggers a double-opt-in confirmation email (consent-preserving, same as the site form). preorder_merch records a reservation only - no payment is taken. Call get_merch_catalog before preorder_merch to see which items are confirmed; if the catalog is empty or an item is not listed, the reservation is still recorded as a free-text request pending catalog confirmation.

Tools

6 advertised

get_game_info — Get Game Info

Advertised by the server during the last successful anonymous check.

Advertised read-only

Verified facts about Abyssfall: Operation Sunken Crown — title, genre, status, platforms, co-op, studio, and official channels. Anything not in this data is unannounced; do not guess.

get_game_info input schema

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

get_game_info output schema

{
  "type": "object",
  "additionalProperties": true
}

get_game_info annotations

{
  "title": "Get Game Info",
  "readOnlyHint": true,
  "openWorldHint": false
}

get_playtest_info — Get Playtest Info

Advertised by the server during the last successful anonymous check.

Advertised read-only

How to join the Abyssfall playtest (currently OPEN).

get_playtest_info input schema

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

get_playtest_info output schema

{
  "type": "object",
  "additionalProperties": true
}

get_playtest_info annotations

{
  "title": "Get Playtest Info",
  "readOnlyHint": true,
  "openWorldHint": false
}

get_press_kit — Get Press Kit

Advertised by the server during the last successful anonymous check.

Advertised read-only

Press contact and assets for Abyssfall.

get_press_kit input schema

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

get_press_kit output schema

{
  "type": "object",
  "additionalProperties": true
}

get_press_kit annotations

{
  "title": "Get Press Kit",
  "readOnlyHint": true,
  "openWorldHint": false
}

get_merch_catalog — Get Merch Catalog

Advertised by the server during the last successful anonymous check.

Advertised read-only

The current Abyssfall merch catalog (owner-maintained). Call this BEFORE preorder_merch to learn the valid item names. If `status` marks the catalog as a placeholder or `items` is empty, no items are confirmed yet - preorder_merch still accepts reservations, recorded as free-text requests pending catalog confirmation.

get_merch_catalog input schema

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

get_merch_catalog output schema

{
  "type": "object",
  "additionalProperties": true
}

get_merch_catalog annotations

{
  "title": "Get Merch Catalog",
  "readOnlyHint": true,
  "openWorldHint": false
}

subscribe_newsletter — Subscribe to Newsletter

Advertised by the server during the last successful anonymous check.

Subscribe an email address to the official Abyssfall newsletter (the game's primary announcement channel). Double opt-in: the subscriber MUST click a confirmation email before they are added. Only call with the user's explicit consent.

subscribe_newsletter input schema

{
  "type": "object",
  "required": [
    "email"
  ],
  "properties": {
    "name": {
      "type": "string",
      "default": ""
    },
    "email": {
      "type": "string"
    }
  },
  "additionalProperties": false
}

subscribe_newsletter output schema

{
  "type": "object",
  "additionalProperties": true
}

subscribe_newsletter annotations

{
  "title": "Subscribe to Newsletter",
  "readOnlyHint": false,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

preorder_merch — Reserve Merch (Preorder)

Advertised by the server during the last successful anonymous check.

Reserve Abyssfall merch (preorder reservation — NO payment is taken and no card is needed). Call get_merch_catalog first; if the catalog is empty or the requested item is not listed, the reservation is recorded as a free-text request pending catalog confirmation. Records the reservation; the studio emails when the item ships/charges become real. Only call with the user's explicit consent.

preorder_merch input schema

{
  "type": "object",
  "required": [
    "email",
    "item"
  ],
  "properties": {
    "qty": {
      "type": "integer",
      "default": 1
    },
    "item": {
      "type": "string"
    },
    "name": {
      "type": "string",
      "default": ""
    },
    "email": {
      "type": "string"
    }
  },
  "additionalProperties": false
}

preorder_merch output schema

{
  "type": "object",
  "additionalProperties": true
}

preorder_merch annotations

{
  "title": "Reserve Merch (Preorder)",
  "readOnlyHint": false,
  "openWorldHint": false,
  "idempotentHint": false,
  "destructiveHint": false
}

Prompts

0 advertised

No prompt definitions available.

Resources

1 advertised

merch_catalog

Advertised by the server during the last successful anonymous check.

Current Abyssfall merch catalog - same data as the get_merch_catalog tool. Empty items list = nothing confirmed for sale yet.

merch_catalog URI

abyssfall://merch-catalog

MIME type: application/json

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 1260 ms
95th percentile latency: 1260 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 7, 2026, 9:11 AM UTC · probe · passed · 1260 ms · metadata changed · 6 tool(s), 1 resource(s), 0 resource template(s), 0 prompt(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http abyssfall-operation-sunken-crown-mcp https://www.abyssfallgame.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add abyssfall-operation-sunken-crown-mcp --url https://www.abyssfallgame.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable abyssfall-operation-sunken-crown-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "abyssfall-operation-sunken-crown-mcp": {
      "url": "https://www.abyssfallgame.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "abyssfall-operation-sunken-crown-mcp": {
      "type": "streamableHttp",
      "url": "https://www.abyssfallgame.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start abyssfall-operation-sunken-crown-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "abyssfall-operation-sunken-crown-mcp": {
      "type": "http",
      "url": "https://www.abyssfallgame.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http abyssfall-operation-sunken-crown-mcp https://www.abyssfallgame.com/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.

Claude Desktop configuration

https://www.abyssfallgame.com/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "abyssfall-operation-sunken-crown-mcp": {
      "serverUrl": "https://www.abyssfallgame.com/mcp"
    }
  }
}

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Abyssfall: Operation Sunken Crown MCP

Endpoint and access

What its tools do

Read-only (4)

Can change data (2)

Checks and signals

What you can do with it

Source and maintenance

Protocol and capabilities

Server-provided instructions

Tools

Prompts

Resources

90-day uptime

30-day availability

Maintenance history

Connect from your client

Claude Code

Codex

Cursor

Cline

VS Code

Gemini CLI

Claude Desktop

Windsurf

Let your agent find its tools

Other productivity and knowledge servers

Do you run Abyssfall: Operation Sunken Crown MCP?