Discover and list all available SHACL shapes with their URIs and descriptions
AI agents call discover_shapes to retrieve information from Earth616 Vocabulary Service without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs only a read operation—it discovers and lists existing SHACL shapes and their metadata (URIs and descriptions). There are no side effects, data modification, code execution, deletion, or financial implications. The sibling tools on this server (explore_vocabulary, list_all_files, list_ontology_releases, etc.) confirm a pattern of read-only vocabulary and ontology browsing.
From the tool's definition Tool name 'discover_shapes' combined with description 'Discover and list all available SHACL shapes with their URIs and descriptions' indicates a retrieval/query operation that returns metadata about available shapes without modification.
Attacks that exploit this kind of access
Discover and list all available SHACL shapes with their URIs and descriptions. It is categorised as a Read tool in the Earth616 Vocabulary Service MCP Server, which means it retrieves data without modifying state.
Register the Earth616 Vocabulary Service MCP server in PolicyLayer and add a rule for discover_shapes: 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 Earth616 Vocabulary Service. Nothing to install.
discover_shapes 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 discover_shapes 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 discover_shapes. 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.
discover_shapes is provided by the Earth616 Vocabulary Service MCP server (la3d/mcp_vocabulary_service). 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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