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MCP Server — Model Context Protocol for Solana Wallet Operations

Model Context Protocol server exposing tools, resources, and prompts for AI agent consumption over stdio transport with session keypair management.

Architecture

AI Agent (Claude, etc.)
        │
    stdio transport
        │
   SolanaWalletMCPServer
        │
   ┌────┼────────┬──────────┐
   │    │        │          │
  Tools Resources Prompts  Session
   │    │        │        State
   7    3        3         │
  tools types   prompts  Keypair

Tools (7)

Tool	Description
generate_keypair	Generate a new random Solana keypair
generate_vanity	Generate vanity address with prefix/suffix
estimate_vanity_time	Estimate time for vanity pattern
validate_address	Validate a Solana Base58 address
sign_message	Sign a message with session keypair
verify_signature	Verify a signed message
restore_keypair	Restore keypair from secret key bytes

Resources (3)

URI Pattern	Description
solana://keypair/current	Current session keypair info
solana://keypair/{id}	Specific keypair by ID
solana://address/{address}	Address validation details

Prompts (3)

Prompt	Description
generate-wallet	Guide user through wallet generation
vanity-address	Guide vanity address generation with difficulty estimate
security-review	Review security of wallet operations

Session State Management

class SolanaWalletMCPServer {
    private sessionKeypair: Keypair | null = null;

    generateKeypair(): KeypairInfo {
        if (this.sessionKeypair) {
            this.sessionKeypair.secretKey.fill(0); // zeroize old
        }
        this.sessionKeypair = Keypair.generate();
        return this.getKeypairInfo();
    }
}

Security Model

• Session keypair is zeroized when replaced or server shuts down
• No network calls for key generation
• All crypto uses @solana/web3.js only
• Zod schemas validate all tool inputs
• Secret key bytes are never logged or exposed in resources

Patterns to Follow

• Validate all inputs with Zod schemas before processing
• Zeroize secret keys when replaced or on shutdown
• Return structured JSON for all tool responses
• Use descriptive error messages for validation failures
• Keep session state minimal — one active keypair at a time

Common Pitfalls

• Session keypair is ephemeral — lost when server restarts
• generate_vanity is single-threaded — long prefixes will be slow
• sign_message requires an active session keypair — generate_keypair first
• Resource URIs are case-sensitive