convert_onedrive_file
Turn a file already in the user’s OneDrive into a PDF or a JPG — Microsoft does the conversion on its own servers, so nothing is re-encoded here and nothing is lost in a screenshot. It reads about 130 source formats, which is the point: PowerPoint and Word decks, Excel, Photoshop PSD, Illustrator...
This record as markdown: /tools/hermoso/convert-onedrive-file.md
What convert_onedrive_file does on Hermoso
AI agents use convert_onedrive_file to create or update resources in Hermoso, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Hermoso environment.
Why convert_onedrive_file is rated Medium
An AI agent can call convert_onedrive_file faster than any human can review: one bad instruction and it creates or modifies resources in Hermoso by the hundred, each call as confident as the last.
Attacks that exploit this kind of access
The rule that runs convert_onedrive_file safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Hermoso, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For convert_onedrive_file, this is the rule to start with:
convert_onedrive_file 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Hermoso, apply this rule, and every convert_onedrive_file call is checked against it from then on.
Questions about convert_onedrive_file
Turn a file already in the user’s OneDrive into a PDF or a JPG — Microsoft does the conversion on its own servers, so nothing is re-encoded here and nothing is lost in a screenshot. It reads about 130 source formats, which is the point: PowerPoint and Word decks, Excel, Photoshop PSD, Illustrator AI, Sketch, 3D (fbx/glb/obj), video (mp4/mov/webm), HEIC from an iPhone, and the raw camera formats (CR2, NEF, ARW, DNG) that nothing else in this product can open. Use it to turn a client’s deck into images you can actually put in an ad, to get a usable JPG out of a designer’s PSD or a photographer’s raw file, or to hand someone a PDF of a spreadsheet. CONVERTING TO JPG REQUIRES BOTH width AND height — Microsoft refuses the call without them. The result is stored at a durable Hermoso URL you can pass straight to a render or a post; Microsoft’s own conversion link expires within minutes, so do not hand that one to anyone. Needs OneDrive connected — no new permission. It is categorised as a Write tool in the Hermoso MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Hermoso MCP server in PolicyLayer and add a rule for convert_onedrive_file: 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 Hermoso. Nothing to install.
convert_onedrive_file 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 convert_onedrive_file 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 convert_onedrive_file. 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.
convert_onedrive_file is provided by the Hermoso MCP server (https://app.hermoso.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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