Arca
Give Claude Code or Cursor a private vault so agents persist structured data, semantic memory, and reusable skills across sessions.
Overview
Arca MCP is a MCP server for the Build phase that lets your agent store and retrieve structured data, semantic memory, and skills in a private Arca vault.
What is this MCP server?
- Private data vault for structured records your agent can read and write
- Semantic memory layer so context survives beyond a single chat thread
- Skill and artifact storage tied to your Arca account on arca.build
- Remote MCP over streamable-http and SSE at https://mcp.arca.build
- Bearer or OAuth authorization with API key from arca.build
- Remote endpoint: https://mcp.arca.build
- Transports: streamable-http and SSE
- Server schema version: 0.0.1
What problem does it solve?
Agent sessions forget everything when the window closes, so solo builders keep re-explaining context and lose structured outputs between coding runs.
Who is it for?
Indie builders running long-horizon agent workflows who want hosted semantic memory without operating their own vector stack.
Skip if: Teams that need all data on-prem with no third-party vault, or builders who only need stateless one-shot API calls.
What do I get? / Deliverables
After you register Arca with a valid API key, your agent can read and write durable memory and skills in your vault instead of starting from zero each session.
- Registered remote MCP connection to mcp.arca.build
- Agent-accessible structured data and semantic memory in your vault
- Reusable skill storage readable on later agent invocations
Recommended MCP Servers
Journey fit
Arca is where you wire durable agent state during product work; it sits on the build shelf because memory and skills attach while you ship features, not during first ideation alone. agent-tooling is the canonical home for MCP servers that extend what your coding agent can remember and store, rather than one-off API glue.
How it compares
Hosted agent memory vault via MCP, not a local skill markdown pack or a generic SQL database connector.
Common Questions / FAQ
Who is Arca MCP for?
Solo and small-team builders using Claude Code, Cursor, or other MCP clients who want private structured storage and semantic memory for their coding agents.
When should I use Arca MCP?
Use it when you are building or operating agent-heavy products and need persistent memory, structured records, or stored skills across many sessions.
How do I add Arca MCP to my agent?
Get an API key or OAuth credentials on arca.build, add the remote server https://mcp.arca.build with an Authorization header, and enable streamable-http or SSE in your MCP client.