Run a GraphQL query against a subgraph on The Graph network. subgraph_id is the deployment hash (starts with "Qm…" or the new "0x…" subgraph ID from thegraph.com/explorer). Returns the GraphQL data block plus any errors.
Risk signalsAccepts freeform code/query input (query)
Part of the The Graph server.
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AI agents call query_subgraph to retrieve information from The Graph 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 query_subgraph 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.
{
"version": "1",
"default": "deny",
"tools": {
"query_subgraph": {}
}
}See the full The Graph policy for all 22 tools.
These attack patterns abuse exactly the kind of access query_subgraph gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Run a GraphQL query against a subgraph on The Graph network. subgraph_id is the deployment hash (starts with "Qm…" or the new "0x…" subgraph ID from thegraph.com/explorer). Returns the GraphQL data block plus any errors.. It is categorised as a Read tool in the The Graph MCP Server, which means it retrieves data without modifying state.
Register the The Graph MCP server in PolicyLayer and add a rule for query_subgraph: 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 The Graph. Nothing to install.
query_subgraph 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 query_subgraph 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 query_subgraph. 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.
query_subgraph is provided by the The Graph MCP server (https://gateway.pipeworx.io/the-graph/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 22 The Graph tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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