Validate chart input and optional generated HTML.
AI agents call validate_chart_page to retrieve information from ECharts ChartPage MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Validation is an inspection and verification function that queries the state or structure of inputs without creating, modifying, deleting, or executing operations. It provides feedback on correctness but does not alter data or trigger external actions. This is characteristic of Read category tools.
From the tool's definition The tool description states it 'validate[s] chart input and optional generated HTML.' The verb 'validate' is a read-only operation that checks data against rules without modifying, deleting, or executing external operations. No side effects are mentioned.
Attacks that exploit this kind of access
Validate chart input and optional generated HTML. It is categorised as a Read tool in the ECharts ChartPage MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ECharts ChartPage MCP Server MCP server in PolicyLayer and add a rule for validate_chart_page: 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 ECharts ChartPage MCP Server. Nothing to install.
validate_chart_page 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 validate_chart_page 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 validate_chart_page. 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.
validate_chart_page is provided by the ECharts ChartPage MCP Server MCP server (riverthrimp/echarts-chartpage). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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