sap_open_vault_session
Open a vault session by 32-byte session hash. SAP MCP context: Memory/session flow. Store only intentionally encrypted payloads or public hashes; session and vault PDAs are visible on-chain metadata. SAP MCP execution guidance: Intent: SAP MCP tool workflow. Pricing: paid read-premium; estimate f...
This record as markdown: /tools/oobe-protocol-labs-sap-mcp-server/sap-open-vault-session.md
What sap_open_vault_session does on Sap
AI agents invoke sap_open_vault_session to trigger actions in Sap. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
| Parameter | Type | Required | Description |
|---|---|---|---|
sessionHash | array | — | 32-byte session hash as a byte array, hex string, or base64 string |
Parameters from the server's own tool schema.
Why sap_open_vault_session is rated High
Opens a cryptographic vault session on-chain, triggering external blockchain state changes.
From the tool's definition Open a vault session by 32-byte session hash; on-chain metadata
Attacks that exploit this kind of access
The rule that runs sap_open_vault_session 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_open_vault_session, this is the rule to start with:
sap_open_vault_session stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Sap, apply this rule, and every sap_open_vault_session call is checked against it from then on.
Questions about sap_open_vault_session
Open a vault session by 32-byte session hash. SAP MCP context: Memory/session flow. Store only intentionally encrypted payloads or public hashes; session and vault PDAs are visible on-chain metadata. SAP MCP execution guidance: Intent: SAP MCP tool workflow. Pricing: paid read-premium; estimate first, then use sap_payments_call_paid_tool when the runtime cannot replay x402 natively. Routing: hosted accountless write is blocked; do not call this as a paid hosted write and no x402 payment should be charged. Use the local sap_payments bridge or a hosted unsigned builder 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 Execute tool in the Sap MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
sap_open_vault_session accepts 1 parameter: sessionHash. The full parameter table on this page comes from the server's own tool schema.
Register the Sap MCP server in PolicyLayer and add a rule for sap_open_vault_session: 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.
sap_open_vault_session is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the sap_open_vault_session 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.
Set action: deny in the PolicyLayer policy for sap_open_vault_session. 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.
sap_open_vault_session 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.
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