TxWhy

Connect Remote server

claude mcp add --transport http txwhy https://txwhy.vercel.app/api/mcp

{
  "mcpServers": {
    "txwhy": {
      "url": "https://txwhy.vercel.app/api/mcp"
    }
  }
}

{
  "servers": {
    "txwhy": {
      "type": "http",
      "url": "https://txwhy.vercel.app/api/mcp"
    }
  }
}

Settings > Connectors > Add custom connector
URL: https://txwhy.vercel.app/api/mcp

Tools 3 found in our last check

• repair_transaction

  Give it a Solana transaction that failed, or one you are about to send. It finds the cause and returns a rebuilt UNSIGNED transaction that has been simulated against live mainnet state to prove it passes. Fixes expired blockhashes, compute-unit limits, priority fees, loaded-data…

• diagnose_transaction

  Explains why a transaction that landed on mainnet failed: the exact failing instruction in the call tree, the named error, its cause, and how to fix it. Read-only and fast. Use repair_transaction when you want a working transaction back.

• explain_error

  Looks up what a custom program error code means for a given program, using 1,800+ named errors from major Solana programs plus the runtime's own errors. Use it when you only have a code such as 6001 or 0x1771 from a simulation or an RPC response.

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