Browse and search the canonical tag vocabulary for Open Food Facts filter facets. Returns tag IDs and display names for use as filter values in off_search_products. Covers categories, labels/certifications, allergens, additives, countries, NOVA groups, and Nutri-Score grades. The taxonomy is embe...
Part of the Openfoodfacts Mcp Server server.
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AI agents call off_browse_taxonomy to retrieve information from Openfoodfacts Mcp Server without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though off_browse_taxonomy only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"off_browse_taxonomy": {}
}
}See the full Openfoodfacts Mcp Server policy for all 4 tools.
These attack patterns abuse exactly the kind of access off_browse_taxonomy gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Browse and search the canonical tag vocabulary for Open Food Facts filter facets. Returns tag IDs and display names for use as filter values in off_search_products. Covers categories, labels/certifications, allergens, additives, countries, NOVA groups, and Nutri-Score grades. The taxonomy is embedded — not fetched live — because the OFF taxonomy API is unavailable to anonymous bot clients. Tag IDs use the "en:" prefix convention (e.g. "en:organic", "en:gluten-free", "en:milk"). Always use these tag IDs as filter values, not plain English terms.. It is categorised as a Read tool in the Openfoodfacts Mcp Server MCP Server, which means it retrieves data without modifying state.
Register the Openfoodfacts Mcp Server MCP server in PolicyLayer and add a rule for off_browse_taxonomy: 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 Openfoodfacts Mcp Server. Nothing to install.
off_browse_taxonomy 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 off_browse_taxonomy 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 off_browse_taxonomy. 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.
off_browse_taxonomy is provided by the Openfoodfacts Mcp Server MCP server (@cyanheads/openfoodfacts-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Openfoodfacts Mcp Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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