@mnemonik-xyz/cli

Project site: mnemonik.xyz · Hosted MCP: https://mcp.mnemonik.xyz/mcp

mnemonic — command-line interface for the Mnemonic Protocol. A thin wrapper over @mnemonik-xyz/sdk that adds Node-only persistence under ~/.mnemonic/, an interactive PKCE loopback OAuth flow, and TTY-aware output formatting. Same OAuth + COSE substrate as the Cursor / VS Code / Claude.ai connectors and the webapp; the CLI just swaps the renderer.

Install

npm install -g @mnemonik-xyz/cli

Bun and Deno work too — Bun bun install -g @mnemonik-xyz/cli, Deno deno install -A -n mnemonic npm:@mnemonik-xyz/cli/bin/mnemonic.js. Requires Node ≥ 20 (or equivalent Bun / Deno).

Quick start

mnemonic init && mnemonic login && mnemonic sign "hello"

init creates ~/.mnemonic/identity.json (mode 0600). login opens your browser, completes the OAuth 2.1 + PKCE handshake against https://mcp.mnemonik.xyz, and persists the JWT to ~/.mnemonic/token.json (mode 0600). sign produces a verifiable attestation backed by the COSE_Sign1 envelope of your local keypair.

Commands

mnemonic init [--force]

Generate a fresh keypair at ~/.mnemonic/identity.json. Refuses to overwrite an existing identity unless --force is passed.

$ mnemonic init
identity created: /Users/you/.mnemonic/identity.json
pubkey: 6ZsT...3kQp
did:    did:sol:6ZsT...3kQp

mnemonic login [--token <jwt>] [--base-url <url>]

Two modes:

• Interactive (default): binds a one-shot 127.0.0.1:0 loopback server, opens your browser at /oauth/authorize, awaits the callback, and exchanges the code for a JWT. PKCE state and redirect_uri are validated before any token request.
• Headless (--token <jwt>): persist a pre-issued JWT. The token is parsed locally (alg=HS256, fresh exp, present sub) but not verified against the server.

$ mnemonic login
opening browser: https://mcp.mnemonik.xyz/oauth/authorize?...
login OK
sub: 6ZsT...3kQp
expires: 2026-04-29T18:32:11.000Z

mnemonic sign <content> [--tags <list>] [--base-url <url>]

Sign a memory. Content is read from the positional argument or — if absent and stdin is piped — from stdin. Tags are comma-separated.

$ mnemonic sign "hello world" --tags=demo,test
attestation_id: 01HX9F2KQ7...
signed_at:      2026-04-28T11:14:22.901Z
status:         signed
content_hash:   blake3:6c7f...

mnemonic recall <query> [--top-k <n>] [--tag <tag>] [--base-url <url>]

Semantic recall over your stored memories. Default --top-k is 5; --tag filters to a single tag.

$ mnemonic recall "hello" --top-k=3
2 hit(s) of 14:
  01HX9F2KQ7  sim=0.987  [demo,test]  hello world
  01HX9F0YBZ  sim=0.812  [demo]       hello again

mnemonic verify <attestation_id> [--base-url <url>]

Verify an attestation. Exit codes: 0 verified, 3 tampered, 1 not found.

$ mnemonic verify 01HX9F2KQ7...
status: verified
signer: 6ZsT...3kQp

mnemonic whoami [--with-count] [--base-url <url>]

Print the user's local identity and JWT — client-side, no server call by default (Decision 14). --with-count adds an optional recall(' ', topK=0) round-trip for a memory total.

$ mnemonic whoami
pubkey:       6ZsT...3kQp
did:          did:sol:6ZsT...3kQp
jwt sub:      6ZsT...3kQp
jwt issued:   2026-04-28T11:00:00.000Z
jwt expires:  2026-04-29T11:00:00.000Z
signer_match: yes

mnemonic prove [--challenge <hex>]

Sign a challenge with the local key — entirely offline. Defaults to a fresh 32-byte challenge if --challenge is omitted. Output can be verified offline with the printed pubkey + Ed25519 verify.

$ mnemonic prove --challenge=00112233
pubkey:    6ZsT...3kQp
did:       did:sol:6ZsT...3kQp
challenge: 00112233
signature: 7f3a...c411

mnemonic identity import [--ticket <uuid> | --file <path>] [--force] [--base-url <url>]

Import a keypair from either a webapp "Send to CLI" ticket (via /api/cli-bootstrap/redeem) or a local JSON file in the same shape as ~/.mnemonic/identity.json. --ticket and --file are mutually exclusive. Refuses to overwrite an existing identity unless --force.

$ mnemonic identity import --ticket 7c3f9b2a-...-...
identity imported: /Users/you/.mnemonic/identity.json
pubkey: 6ZsT...3kQp
did:    did:sol:6ZsT...3kQp

mnemonic identity export --file <path>

Write the current ~/.mnemonic/identity.json to <path> with file mode 0600 (Windows: ACL restricted to the current user via icacls). There is no clipboard option — clipboard leakage is a documented security concern.

$ mnemonic identity export --file /tmp/k.json
identity exported: /tmp/k.json
pubkey: 6ZsT...3kQp
mode:   0600 (file permissions restricted to current user)

Output flags

Top-level flags are accepted before the subcommand.

| Flag | Effect | | --- | --- | | --json | Emit machine-readable JSON to stdout; hints / progress to stderr. | | --quiet | Suppress non-essential stdout. Combine with --json for a single payload. | | --no-color | Force plain text. Implicit when stdout is not a TTY. |

mnemonic --json sign "hello"
mnemonic --quiet --json recall "demo"
mnemonic --no-color whoami

Exit codes

Per Decision 10. Tested in packages/cli/test/.

| Code | Meaning | | --- | --- | | 0 | Success. | | 1 | User error — bad input, missing identity, verify not_found. | | 2 | Server / network error — 5xx, connection refused, malformed response. | | 3 | Integrity failure — verify <id> returned tampered. | | 4 | Auth error — 401 / 403, expired JWT, OAuth state mismatch. |

Manual smoke checklist

Pre-release smoke flow lives in SMOKE.md. Run before publishing a new version.

License

Apache-2.0.