Add additional tiles to an existing split (when you realize a category was missed). The parent must already have been split. This invalidates the MECE validation.
AI agents use add_tiles_to_split to create or update resources in Tiling Trees MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Tiling Trees MCP Server environment.
The tool creates or modifies data (adds tiles to a split) in a reversible manner. It does not delete data (not Destructive), execute arbitrary operations (not Execute), move money (not Financial), or merely read (not Read). The severity is low because the operation is limited in scope to adding organizational tiles within a research hierarchy, with no risk of cascading damage or irreversible loss.
From the tool's definition Tool description states 'Add additional tiles to an existing split' and 'invalidates the MECE validation', indicating modification of existing research structure data without deletion or financial impact.
Attacks that exploit this kind of access
Add additional tiles to an existing split (when you realize a category was missed). The parent must already have been split. This invalidates the MECE validation. It is categorised as a Write tool in the Tiling Trees MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Tiling Trees MCP Server MCP server in PolicyLayer and add a rule for add_tiles_to_split: 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 Tiling Trees MCP Server. Nothing to install.
add_tiles_to_split 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 add_tiles_to_split 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 add_tiles_to_split. 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.
add_tiles_to_split is provided by the Tiling Trees MCP Server MCP server (k-chrispens/tiling-trees-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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