modbender 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.jsonly - 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_vanityis single-threaded — long prefixes will be slowsign_messagerequires an active session keypair —generate_keypairfirst- Resource URIs are case-sensitive