AI agents invoke build_file_dep_graph to trigger actions in Mementos. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
While the tool reads source files, its primary action is to execute/construct a dependency graph structure. This goes beyond passive Read (which would be querying existing data). It's not Write in the sense of modifying user data reversibly, nor Destructive. The 'creates' verb suggests output generation tied to execution.
From the tool's definition Tool "build_file_dep_graph" performs code scanning and graph construction—'builds' a dependency graph—which involves traversing the filesystem, parsing code, and creating artifacts.
Attacks that exploit this kind of access
Scan a codebase directory and build a file dependency graph: creates. It is categorised as a Execute tool in the Mementos MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Mementos MCP server in PolicyLayer and add a rule for build_file_dep_graph: 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 Mementos. Nothing to install.
build_file_dep_graph is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the build_file_dep_graph 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 build_file_dep_graph. 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.
build_file_dep_graph is provided by the Mementos MCP server (@hasna/mementos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
build_file_dep_graph is one line of Mementos's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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