This record as markdown: /tools/io-github-dave-london-cargo/tree.md
What tree does on Cargo
AI agents call tree to retrieve information from Cargo without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why tree is rated Low
The tool performs dependency analysis and visualization, which is a read-only operation. It queries the project's dependency structure and outputs information without side effects, modifications, or reversible/irreversible changes to the system or project state. This aligns with the Read category definition of retrieving or querying data with no side effects.
From the tool's definition Tool name 'tree' and description 'Displays the dependency tree for a Rust project' indicate a query/read operation that retrieves and presents project dependency information without modifying any data.
Attacks that exploit this kind of access
The rule that runs tree safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Cargo, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For tree, this is the rule to start with:
tree is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Cargo, apply this rule, and every tree call is checked against it from then on.
Questions about tree
Displays the dependency tree for a Rust project. It is categorised as a Read tool in the Cargo MCP Server, which means it retrieves data without modifying state.
Register the Cargo MCP server in PolicyLayer and add a rule for tree: 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 Cargo. Nothing to install.
tree 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 tree 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 tree. 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.
tree is provided by the Cargo MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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