kg_get_subgraph

Get a subgraph containing specified entities and all edges between them. Useful for understanding how a set of entities relate to each other.

SERVERCoWork OS SOURCECoWork-OS/CoWork-OS

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/cowork-os/kg-get-subgraph.md

WHAT IT DOES

What kg_get_subgraph does on CoWork OS

AI agents call kg_get_subgraph to retrieve information from CoWork OS without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why kg_get_subgraph is rated Low

This tool performs a read-only operation on a knowledge graph structure. It retrieves and returns a subset of graph data (entities and their relationships) with no side effects, no data modification, and no irreversible actions. The parameters are constrained to entity selection rather than arbitrary code execution. This is a classic Read category tool with low risk profile for misuse.

From the tool's definition Tool description states 'Get a subgraph containing specified entities and all edges between them' — a retrieval operation that queries and returns relational data without modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs kg_get_subgraph safely

PolicyLayer is an MCP gateway: it sits between your AI agents and CoWork OS, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For kg_get_subgraph, this is the rule to start with:

kg_get_subgraph Allowed

kg_get_subgraph is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "kg_get_subgraph": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect CoWork OS, apply this rule, and every kg_get_subgraph call is checked against it from then on.

FAQ

Questions about kg_get_subgraph

What does the kg_get_subgraph tool do? +

Get a subgraph containing specified entities and all edges between them. Useful for understanding how a set of entities relate to each other. It is categorised as a Read tool in the CoWork OS MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on kg_get_subgraph? +

Register the CoWork OS MCP server in PolicyLayer and add a rule for kg_get_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 CoWork OS. Nothing to install.

What risk level is kg_get_subgraph? +

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

Can I rate-limit kg_get_subgraph? +

Yes. Add a rate_limit block to the kg_get_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.

How do I block kg_get_subgraph completely? +

Set action: deny in the PolicyLayer policy for kg_get_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.

What MCP server provides kg_get_subgraph? +

kg_get_subgraph is provided by the CoWork OS MCP server (CoWork-OS/CoWork-OS). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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