AI agents use modify_shape to create or update resources in PPTX MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your PPTX MCP Server environment.
Modifying shapes in a presentation is a reversible write operation—changes can be undone or overwritten. It creates or alters data but does not destroy it irreversibly. Severity is medium because misuse could corrupt a presentation's layout or content, but changes remain reversible and the blast radius is limited to the single presentation file.
From the tool's definition Tool named 'modify_shape' on a PPTX presentation editing server. Sibling tools include 'add_shape', 'delete_shape', 'add_textbox', indicating this server enables modification of presentation content.
Documented attack patterns abuse exactly the kind of access modify_shape gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and PPTX MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for modify_shape:
{
"version": "1",
"default": "deny",
"tools": {
"modify_shape": {
"limits": [
{
"counter": "modify_shape_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}modify_shape 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.
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modify_shape. It is categorised as a Write tool in the PPTX MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the PPTX MCP Server MCP server in PolicyLayer and add a rule for modify_shape: 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 PPTX MCP Server. Nothing to install.
modify_shape is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the modify_shape 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 modify_shape. 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.
modify_shape is provided by the PPTX MCP Server MCP server (samos123/pptx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 11 PPTX MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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11 PPTX MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.