Update an EXISTING card by generating audio from a specified field and adding it to an audio field. Use this ONLY for cards that already exist (you must have the noteId). For creating new cards with audio, use add_card_with_audio instead.
AI agents use update_card_with_audio to create or update resources in Anki MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Anki MCP Server environment.
This tool creates or modifies data reversibly—it adds audio content to existing flashcard fields. While it changes card data, the operation is non-destructive and can be undone (audio can be removed or replaced). The modification scope is limited to adding audio to a single card's audio field, making it a Write-category operation.
From the tool's definition The tool "update_card_with_audio" modifies existing cards by generating and adding audio to specified fields. The description explicitly states it updates EXISTING cards, confirming it is a modification operation rather than a read or destructive action.
Documented attack patterns abuse exactly the kind of access update_card_with_audio gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Anki MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for update_card_with_audio:
{
"version": "1",
"default": "deny",
"tools": {
"update_card_with_audio": {
"limits": [
{
"counter": "update_card_with_audio_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_card_with_audio 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.
Free to start. No card required.
Update an EXISTING card by generating audio from a specified field and adding it to an audio field. Use this ONLY for cards that already exist (you must have the noteId). For creating new cards with audio, use add_card_with_audio instead. It is categorised as a Write tool in the Anki MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Anki MCP Server MCP server in PolicyLayer and add a rule for update_card_with_audio: 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 Anki MCP Server. Nothing to install.
update_card_with_audio 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 update_card_with_audio 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 update_card_with_audio. 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.
update_card_with_audio is provided by the Anki MCP Server MCP server (nietus/anki-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 22 Anki MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
22 Anki MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.