sap_sign_transaction

SERVERSap SOURCEhttps://mcp.sap.oobeprotocol.ai/mcp

Critical RISK CLASS

Category Financial

Parameters 20 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/oobe-protocol-labs-sap-mcp-server/sap-sign-transaction.md

WHAT IT DOES

What sap_sign_transaction does on Sap

AI agents use sap_sign_transaction to commit financial operations through Sap, usually the final step of a payment, billing, or trading workflow. A call moves real money.

Parameter	Type	Required	Description
`encoding`	string	—	Input encoding
`transaction`	string	—	Unsigned or partially signed transaction

Parameters from the server's own tool schema.

RISK

Why sap_sign_transaction is rated Critical

Signs financial transactions on Solana blockchain; misuse could irreversibly move funds.

From the tool's definition Sign a serialized Solana transaction; paid value-action; preview cost

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs sap_sign_transaction safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Sap, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For sap_sign_transaction, this is the rule to start with:

sap_sign_transaction Approval-gated

Any call to sap_sign_transaction is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sap_sign_transaction": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Sap, apply this rule, and every sap_sign_transaction call is checked against it from then on.

FAQ

Questions about sap_sign_transaction

What does the sap_sign_transaction tool do? +

Sign a serialized Solana transaction with the configured SAP MCP signer after sap_preview_transaction. This is the supported non-custodial signing path for agents; never read keypair JSON or sign raw message bytes in temporary scripts. SAP MCP execution guidance: Intent: SAP MCP tool workflow. Pricing: paid value-action; preview cost and transaction effects before user confirmation. Routing: hosted accountless write is blocked; do not call this as a paid hosted write and no x402 payment should be charged. Use sap_payments_finalize_transaction when user signing is required. Signer boundary: user-controlled local profile or external signer; OOBE hosted MCP remains non-custodial. It is categorised as a Financial tool in the Sap MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

What parameters does sap_sign_transaction accept? +

sap_sign_transaction accepts 2 parameters: encoding, transaction. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on sap_sign_transaction? +

Register the Sap MCP server in PolicyLayer and add a rule for sap_sign_transaction: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Sap. Nothing to install.

What risk level is sap_sign_transaction? +

sap_sign_transaction is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit sap_sign_transaction? +

Yes. Add a rate_limit block to the sap_sign_transaction rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block sap_sign_transaction completely? +

Set action: deny in the PolicyLayer policy for sap_sign_transaction. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides sap_sign_transaction? +

sap_sign_transaction is provided by the Sap MCP server (https://mcp.sap.oobeprotocol.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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bank_transaction_create on AbraFlexi → All critical-risk MCP tools → The MCP Attack Database →

Guides

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