SAP MCP Server

Build SAP x402 Payment Headers

sap_x402_build_payment_headers

Build SAP x402 HTTP headers from a public PaymentContext returned by sap_x402_prepare_payment. SAP MCP context: Payment and settlement flow. Estimate or fetch state before creating escrows or settling calls; write operations require an enabled signer mode and MCP policy approval.

SAP MCP execution guidance: Intent: hosted unsigned transaction builder. Pricing: paid builder; estimate first, then pay/build and finalize unsigned transactions locally when returned. Routing: hosted-safe builder. If a transaction is returned, preview/sign/submit with sap_payments_finalize_transaction; never create temporary signing scripts. Signer boundary: user-controlled local profile or external signer; OOBE hosted MCP remains non-custodial.

Input Schema

TableJSON Schema

Name	Required	Description
`nonce`	No	Escrow nonce as a decimal string. Defaults to 0.
`network`	No	Optional override for X-Payment-Network
`agentPda`	No	Agent PDA (base58)
`maxCalls`	No	Max calls as a decimal string
`escrowPda`	No	Escrow PDA (base58)
`agentWallet`	No	Agent wallet public key (base58)
`txSignature`	No	Escrow creation transaction signature
`pricePerCall`	No	Price per call in token base units
`depositorWallet`	No	Depositor wallet public key (base58)
`networkIdentifier`	No	x402 network identifier stored in the payment context

Output Schema

TableJSON Schema

Name	Required	Description	Default
`content`	Yes	MCP content blocks returned to the caller.
`isError`	No	True when the tool result represents an application-level error.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedJul 24, 2026

addedInput schema / description

Added value: +"Build SAP x402 Payment Headers input schema. Intent: hosted unsigned transaction builder. Pricing: paid builder; estimate first, then pay/build and finalize unsigned transactions locally when returned. Routing: hosted-safe builder. If a transaction is returned, preview/sign/submit with sap_payments_finalize_transaction; never create temporary signing scripts. Signer boundary: user-controlled local profile or external signer; OOBE hosted MCP remains non-custodial. Use exact field names from this schema; do not guess aliases or include private key material."

Changed1 schema field changedJul 17, 2026

addedInput schema / properties / nonce

Added value: +{
+  "description": "Escrow nonce as a decimal string. Defaults to 0.",
+  "type": "string"
+}

First observedJul 13, 2026

TDQS

A3.8/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Discloses it is a paid builder, requires signer mode and MCP policy approval for writes, and returns unsigned transactions. Adds context beyond annotations (readOnlyHint=false) about workflow and safety. No contradiction with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Contains redundancy (e.g., repeated references to 'hosted unsigned transaction builder') and a lengthy execution guidance paragraph that could be streamlined.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Provides sufficient context: input source, required workflow, output handling, and boundary warnings. Output schema exists, so return values are covered. Could include more about PaymentContext, but overall complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so parameters are fully documented. The tool description does not add additional meaning about parameters beyond what the schema provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool builds SAP x402 HTTP headers from a PaymentContext and returns unsigned transactions. However, it does not differentiate from the sibling tool sap_x402_build_headers_from_escrow, which likely has a similar purpose.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides explicit guidance: estimate first, then pay/build, finalize with sap_payments_finalize_transaction. Warns against creating temporary scripts. Misses explicit comparison to alternative builder tools.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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