Obsideo MCP server

Give any MCP-capable agent (Claude Desktop, Claude Code, Cursor, Cline, ...) durable storage that is encrypted on your machine before it is uploaded and that you can independently prove is still held. Zero setup: the first put/get/ls auto-creates a free no-email trial account (100 MB, proof-of-work instead of identity), so storage just works with nothing to configure. Want more? Self-serve signup from inside the conversation upgrades to 12 GB free, no card, no CAPTCHA, no expiry.

Obsideo is S3-compatible object storage where every stored object is replicated to 3 providers and challenged with chunk-level merkle proofs on a continuous cycle; providers are paid only for proofs they pass. Paid tier: $15/TB-month, egress included.

Privacy posture (read this first)

• This server runs on YOUR machine. Obsideo never hosts it. Credentials, the account signing key, and the encryption key live in ~/.obsideo/ and are sent nowhere except the endpoints they authenticate against.
• The account signing key is generated locally; only the public half is ever sent. Keep ~/.obsideo/signing.pem private. Re-running signup rotates credentials and the keypair with no overlap, so do not re-run casually.
• Encrypted by default. put encrypts client-side (AES-256-GCM) with a locally generated, user-held key before anything leaves the machine, so the platform stores ciphertext it is architecturally incapable of reading. Pass encrypt: false only when another tool must read the stored bytes directly (S3 interop).

Back up your key

The encryption key is generated on your machine on first use and written to ~/.obsideo/mcp.json. Obsideo does not have a copy and cannot recover it. If that file is lost, every encrypted object is permanently unreadable, no matter how many providers still hold it and how many proofs it passes. Replication protects against providers losing your bytes; it does not protect against you losing your key. Back up ~/.obsideo/mcp.json somewhere you would still have after losing this machine.

~/.obsideo/roots.json is written alongside it: the merkle root of each object as committed at upload time. It holds no secrets, and it is what lets verify prove providers hold your bytes without re-uploading them. Encryption uses a fresh IV per upload, so ciphertext cannot be recomputed from a plaintext file later; this record is what keeps the strong proof available for encrypted objects. Losing it costs you strength of proof, not data.

Install

Claude Desktop, one click: download obsideo-mcp.mcpb from the latest release, then Settings -> Extensions and drag the file in. No Node or npm setup needed.

Everything else, via npx:

{
  "mcpServers": {
    "obsideo": {
      "command": "npx",
      "args": ["-y", "obsideo-mcp"]
    }
  }
}

(Claude Desktop: claude_desktop_config.json. Claude Code: claude mcp add obsideo -- npx -y obsideo-mcp. Cursor/Cline: their MCP settings, same command.)

Tools

verify

Challenges every provider holding the object directly, recomputes the merkle root, and checks each provider's Ed25519 signature. It asks the coordinator only where to go; nothing the coordinator asserts is trusted for the verdict. For objects this server uploaded, it verifies against the commitment recorded locally at upload time, so the answer is "they hold my bytes" rather than "they agree with each other". Objects uploaded elsewhere can be verified by passing local_path.

What it is good for

App file storage, automated backups (databases, snapshots, state), agent artifacts and memory that must survive sessions and machines, provable offsite copies. Not a CDN, not a queryable database, not sub-millisecond storage; Obsideo stores objects and backup artifacts.

Full integration contract (per-step postconditions, error table): obsideo.io/agents.md

Verified

Every tool in this server was exercised end to end against the production gateway before release, including an encrypted put/get roundtrip verified hash-exact (sha256) and labeled-error passthrough from the signup service.

License

MIT

Privacy Policy

This extension runs entirely on your machine. Credentials, your account signing key, and any client-side encryption key are stored locally in ~/.obsideo/mcp.json and are never sent to or hosted by Obsideo. Conversation content from your AI assistant is not collected; only the tool calls you make (for example an upload) reach the storage service.

Full policy: https://obsideo.io/privacy/