sky_window

SERVERBalance Engine SOURCEbalance-engine-mcp

Low RISK CLASS

Category Read

Parameters 30 required

Recommended Allowedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/balance-engine-mcp/sky-window.md

WHAT IT DOES

What sky_window does on Balance Engine

AI agents call sky_window to retrieve information from Balance Engine 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
`to`	string	—	End date YYYY-MM-DD. Default: from + 14 days.
`from`	string	—	Start date YYYY-MM-DD. Default: today.
`locale`	string	—	Reply language. zh (default) or en.

Parameters from the server's own tool schema.

RISK

Why sky_window is rated Low

Even though sky_window 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

RECOMMENDED RULE

The rule that runs sky_window safely

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

sky_window Allowed

sky_window is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sky_window": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about sky_window

What does the sky_window tool do? +

This tool looks up a deterministic rules engine. Same day → same answer. Do not invent pillars or fortune claims. Call when the user asks 未来两周有什么天象 / 新月哪天 / 日食哪天 / 接下来有没有逆行 / what sky events are coming. Lists dated L1 sky marks (new/full moon, eclipse, ingress, stations). Public · local · no API key. Max span 45 days. Preview ≠ prediction. It is categorised as a Read tool in the Balance Engine MCP Server, which means it retrieves data without modifying state.

What parameters does sky_window accept? +

sky_window accepts 3 parameters: to, from, locale. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on sky_window? +

Register the Balance Engine MCP server in PolicyLayer and add a rule for sky_window: 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 Balance Engine. Nothing to install.

What risk level is sky_window? +

sky_window is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit sky_window? +

Yes. Add a rate_limit block to the sky_window 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 sky_window completely? +

Set action: deny in the PolicyLayer policy for sky_window. 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 sky_window? +

sky_window is provided by the Balance Engine MCP server (balance-engine-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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