Low Risk

get_concept

Get a single concept (node) by its URN identifier

Part of the Datagraphs server.

get_concept is read-only, but an agent in a loop can still rack up calls and cost. PolicyLayer caps every call before it runs. Live in minutes.

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Free to start. No card required.

AI agents call get_concept to retrieve information from Datagraphs without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.

Even though get_concept only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.

Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_concept": {}
  }
}

See the full Datagraphs policy for all 6 tools.

Get this rule live on your own Datagraphs server in minutes. PolicyLayer enforces it on every call, before it runs.

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These attack patterns abuse exactly the kind of access get_concept gives an agent. Each links to the full case and the policy that stops it:

Browse the full MCP Attack Database →

Every attack above starts with a tool call. PolicyLayer checks each one against your policy first, so get_concept only ever does what you allow.

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Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.

What does the get_concept tool do? +

Get a single concept (node) by its URN identifier. It is categorised as a Read tool in the Datagraphs MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_concept? +

Register the Datagraphs MCP server in PolicyLayer and add a rule for get_concept: 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 Datagraphs. Nothing to install.

What risk level is get_concept? +

get_concept is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_concept? +

Yes. Add a rate_limit block to the get_concept 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.

How do I block get_concept completely? +

Set action: deny in the PolicyLayer policy for get_concept. 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.

What MCP server provides get_concept? +

get_concept is provided by the Datagraphs MCP server (@datalanguage/datagraphs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Datagraphs tool call.

Deterministic rules across all 6 Datagraphs tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

Free to start. No card required.

4,600+ MCP servers and 31,000+ tools scanned and risk-classified.

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