AI agents call render_diff_raw to retrieve information from Markview without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool takes a diff string as input and displays it with syntax highlighting in a viewer. It is a read-only visualization operation that retrieves and presents data without side effects, modifications, or code execution. The operation is purely presentational.
From the tool's definition Tool description states it will 'Render a raw unified diff string in MarkView with diff2html syntax highlighting.' The verb 'render' indicates displaying/presenting content without modification. No data creation, deletion, or execution occurs.
Attacks that exploit this kind of access
Render a raw unified diff string in MarkView with diff2html syntax highlighting. It is categorised as a Read tool in the Markview MCP Server, which means it retrieves data without modifying state.
Register the Markview MCP server in PolicyLayer and add a rule for render_diff_raw: 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 Markview. Nothing to install.
render_diff_raw 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 render_diff_raw 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 render_diff_raw. 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.
render_diff_raw is provided by the Markview MCP server (mcp-server-markview). 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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