encrypt_metadata_fields
Encrypt sensitive fields in a metadata object using local key (TODOS_ENCRYPTION_KEY or key file).
This record as markdown: /tools/todos/encrypt-metadata-fields.md
What encrypt_metadata_fields does on Todos
AI agents use encrypt_metadata_fields to create or update resources in Todos, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Todos environment.
Why encrypt_metadata_fields is rated Medium
This tool modifies metadata by encrypting sensitive fields, which is a reversible data transformation (data can be decrypted). It does not delete data, execute arbitrary code, or move money. The primary effect is writing/updating the metadata object with encrypted values. Severity is medium because misconfiguration (wrong key, unintended fields) could corrupt or make data inaccessible.
From the tool's definition 'Encrypt sensitive fields in a metadata object using local key' — transforms/modifies data in place using encryption
Attacks that exploit this kind of access
The rule that runs encrypt_metadata_fields safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Todos, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For encrypt_metadata_fields, this is the rule to start with:
encrypt_metadata_fields 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 Todos, apply this rule, and every encrypt_metadata_fields call is checked against it from then on.
Questions about encrypt_metadata_fields
Encrypt sensitive fields in a metadata object using local key (TODOS_ENCRYPTION_KEY or key file). It is categorised as a Write tool in the Todos MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Todos MCP server in PolicyLayer and add a rule for encrypt_metadata_fields: 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 Todos. Nothing to install.
encrypt_metadata_fields 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 encrypt_metadata_fields 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 encrypt_metadata_fields. 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.
encrypt_metadata_fields is provided by the Todos MCP server (@hasna/todos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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