Coinfello

CoinFello CLI Skill

Use the npx @coinfello/agent-cli@latest CLI to interact with CoinFello. The CLI handles smart account creation, SIWE authentication, delegation management, prompt-based transactions, and transaction status checks.

Prerequisites

• Node.js 20 or later (npx is included with Node.js)

The CLI is available via npx @coinfello/agent-cli@latest. No manual build step is required.

Environment Variables

Security Notice

This skill performs the following sensitive operations:

• Key generation and storage: By default, create_account generates a hardware-backed P256 key in the macOS Secure Enclave (or TPM 2.0 where available). The private key never leaves the hardware and cannot be exported — only public key coordinates and a key tag are saved to ~/.clawdbot/skills/coinfello/config.json. If hardware key support is not available, the CLI warns and falls back to a software private key. You can also explicitly opt into a plaintext software key by passing --use-unsafe-private-key, which stores a raw private key in the config file — this is intended only for development and testing.
• Signer daemon: Running signer-daemon start authenticates once via Touch ID / password and caches the authorization. All subsequent signing operations reuse this cached context, eliminating repeated auth prompts. The daemon communicates over a user-scoped Unix domain socket with restricted permissions (0600). If the daemon is not running, signing operations fall back to direct execution (prompting Touch ID each time).
• Session token storage: Running sign_in stores a SIWE session token in the same config file.
• Delegation signing: Running send_prompt may automatically create and sign blockchain delegations based on server-requested scopes, then submit them to the CoinFello API.

Users should ensure they trust the CoinFello API endpoint configured via COINFELLO_BASE_URL before running delegation flows.

Quick Start

# 1. Start the signing daemon (optional, but avoids repeated Touch ID prompts)
npx @coinfello/agent-cli@latest signer-daemon start

# 2. Create a smart account (uses Secure Enclave by default)
npx @coinfello/agent-cli@latest create_account

# 3. Sign in to CoinFello with your smart account (SIWE)
npx @coinfello/agent-cli@latest sign_in

# 4. Send a natural language prompt — the server will request a delegation if needed
npx @coinfello/agent-cli@latest send_prompt "send 5 USDC to 0xRecipient..."

Commands

create_account

Creates a MetaMask Hybrid smart account. By default, the signing key is generated in the macOS Secure Enclave (hardware-backed, non-exportable). If Secure Enclave is unavailable, the CLI warns and falls back to a software key. Pass --use-unsafe-private-key to explicitly use a plaintext software key (development/testing only).

npx @coinfello/agent-cli@latest create_account [--use-unsafe-private-key]

• Default (Secure Enclave): Generates a P256 key in hardware; saves key_tag, public_key_x, public_key_y, key_id, and smart_account_address to ~/.clawdbot/skills/coinfello/config.json. The private key never leaves the Secure Enclave.
• --use-unsafe-private-key: Generates a random secp256k1 private key and stores it in plaintext in the config file. Use only for development and testing.
• Must be run before send_prompt

get_account

Displays the current smart account address from local config.

npx @coinfello/agent-cli@latest get_account

• Prints the stored smart_account_address
• Exits with an error if no account has been created yet

sign_in

Authenticates with CoinFello using Sign-In with Ethereum (SIWE) and your smart account. Saves the session token to local config.

npx @coinfello/agent-cli@latest sign_in

• Signs in using the private key stored in config
• Saves the session token to ~/.clawdbot/skills/coinfello/config.json
• The session token is loaded automatically for subsequent send_prompt calls
• Must be run after create_account and before send_prompt for authenticated flows

set_delegation

Stores a signed parent delegation (JSON) in local config.

npx @coinfello/agent-cli@latest set_delegation '<delegation-json>'

• <delegation-json> — A JSON string representing a Delegation object from MetaMask Smart Accounts Kit

new_chat

Clears the saved chat session ID from local config so the next send_prompt starts a fresh conversation.

npx @coinfello/agent-cli@latest new_chat

• Removes chat_id from ~/.clawdbot/skills/coinfello/config.json
• Use this when you want to reset conversation context (for example, after context-window errors)

signer-daemon

Manages the Secure Enclave signing daemon. Starting the daemon authenticates once via Touch ID / password and caches the authorization, so subsequent signing operations (account creation, sign-in, delegation signing) do not prompt again.

npx @coinfello/agent-cli@latest signer-daemon start    # Start daemon (one-time auth)
npx @coinfello/agent-cli@latest signer-daemon status   # Check if daemon is running
npx @coinfello/agent-cli@latest signer-daemon stop     # Stop the daemon

• If the daemon is not running, all Secure Enclave operations fall back to direct execution (prompting Touch ID each time)
• The daemon is optional — all commands work without it

send_prompt

Sends a natural language prompt to CoinFello. If the server requires a delegation to execute the action, the CLI creates and signs a subdelegation automatically based on the server's requested scope and chain.

npx @coinfello/agent-cli@latest send_prompt "<prompt>"

Note that if you receive Failed to send prompt: Conversation request failed (400): {"error":"Your input exceeds the context window of this model. Please adjust your input or start a new chat and try again."} then you should call npx @coinfello/agent-cli@latest new_chat to start a new chat with a new context window.

What happens internally:

1. Fetches available agents from /api/v1/automation/coinfello-agents and sends the prompt to CoinFello's conversation endpoint
2. If the server returns a read-only response (no clientToolCalls and no txn_id) → prints the response text and exits
3. If the server returns a txn_id directly with no tool calls → prints it and exits
4. If the server sends an ask_for_delegation client tool call with a chainId and scope:
   • Fetches CoinFello's delegate address
   • Rebuilds the smart account using the chain ID from the tool call
   • Parses the server-provided scope (supports ERC-20, native token, ERC-721, and function call scopes)
   • Creates and signs a subdelegation (wraps with ERC-6492 signature if the smart account is not yet deployed on-chain)
   • Sends the signed delegation back as a clientToolCallResponse along with the chatId and callId from the initial response
   • Returns a txn_id for tracking

Common Workflows

Basic: Send a Prompt (Server-Driven Delegation)

# Start the signing daemon (optional, reduces Touch ID prompts)
npx @coinfello/agent-cli@latest signer-daemon start

# Create account if not already done (uses Secure Enclave by default)
npx @coinfello/agent-cli@latest create_account

# Sign in (required for delegation flows)
npx @coinfello/agent-cli@latest sign_in

# Send a natural language prompt — delegation is handled automatically
npx @coinfello/agent-cli@latest send_prompt "send 5 USDC to 0xRecipient..."

Read-Only Prompt

Some prompts don't require a transaction. The CLI detects this automatically and just prints the response.

npx @coinfello/agent-cli@latest send_prompt "what is the chain ID for Base?"

Gas Cost Estimates

Actual on-chain gas costs vary by network. Do not assume mainnet Ethereum gas prices for L2 chains.

These are approximate ranges under normal network conditions. L2s like Base are significantly cheaper than Ethereum mainnet.

Edge Cases

• No smart account: Run create_account before send_prompt. The CLI checks for a saved private key and address in config.
• Not signed in: Run sign_in before send_prompt if the server requires authentication.
• Invalid chain name: The CLI throws an error listing valid viem chain names.
• Read-only response: If the server returns a text response with no transaction, the CLI prints it and exits without creating a delegation.

Reference

See references/REFERENCE.md for the full config schema, supported chains, API details, scope types, and troubleshooting.