render_chart_svg

[SVG file / PNG save] ローソク足・ラインチャートをサーバー側で SVG/PNG に生成。\nクライアント側で描画可能な場合は prepare_chart_data を優先。\nユーザーが SVG/PNG 保存を明示した場合のみ使用。自発的呼び出し禁止。\ndetect_patterns の overlays を渡してパターン描画可能。\nオプションのインジケーター（SMA/EMA/BB/一目均衡表）はユーザーが明示的に要求した場合のみ指定すること。デフォルトではすべてオフ。

Server Bitbank tjackiet/bitbank-lab-mcp

Category Write

Risk class Medium

Parameters 00 required

WHAT IT DOES

What render_chart_svg does on Bitbank

AI agents use render_chart_svg to create or update resources in Bitbank — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Bitbank environment.

WHY IT NEEDS A POLICY

Why render_chart_svg needs a policy

An AI agent can call render_chart_svg faster than any human can review — one bad instruction and it creates or modifies resources in Bitbank by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

render_chart_svg Rate-limited

render_chart_svg stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "render_chart_svg": {
      "limits": [
        {
          "counter": "render_chart_svg_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Bitbank, so you can run agents against it safely.

FAQ

Questions about render_chart_svg

What does the render_chart_svg tool do? +

How do I enforce a policy on render_chart_svg? +

Register the Bitbank MCP server in PolicyLayer and add a rule for render_chart_svg: 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 Bitbank. Nothing to install.

What risk level is render_chart_svg? +

render_chart_svg is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit render_chart_svg? +

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

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

render_chart_svg is provided by the Bitbank MCP server (tjackiet/bitbank-lab-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.