util_bs_delta
Call/put delta from BS closed form
This record as markdown: /tools/io-github-davidmosiah-delx-mcp-a2a/util-bs-delta.md
What util_bs_delta does on Delx Mcp A2a
AI agents call util_bs_delta to retrieve information from Delx Mcp A2a without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
vol | number | Yes | Annualized volatility as decimal (>0), e.g. 0.2 = 20% |
rate | number | — | Risk-free rate as decimal (optional, default 0) |
spot | number | Yes | Underlying spot price (>0) |
strike | number | Yes | Option strike price (>0) |
t_years | number | Yes | Time to expiry in years (>0) |
Parameters from the server's own tool schema.
Why util_bs_delta is rated Low
Even though util_bs_delta only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs util_bs_delta safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Delx Mcp A2a, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For util_bs_delta, this is the rule to start with:
util_bs_delta is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Delx Mcp A2a, apply this rule, and every util_bs_delta call is checked against it from then on.
Questions about util_bs_delta
Call/put delta from BS closed form. It is categorised as a Read tool in the Delx Mcp A2a MCP Server, which means it retrieves data without modifying state.
util_bs_delta accepts 5 parameters: vol, rate, spot, strike, t_years. Required: vol, spot, strike, t_years. The full parameter table on this page comes from the server's own tool schema.
Register the Delx Mcp A2a MCP server in PolicyLayer and add a rule for util_bs_delta: 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 Delx Mcp A2a. Nothing to install.
util_bs_delta is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the util_bs_delta 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 util_bs_delta. 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.
util_bs_delta is provided by the Delx Mcp A2a MCP server (https://api.delx.ai/v1/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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