substitute_blueprint
Render a blueprint with the given inputs and return the resulting automation/script YAML as a dict.
This record as markdown: /tools/fistacho-ha-nexus-agent/substitute-blueprint.md
What substitute_blueprint does on Ha Nexus Agent
AI agents call substitute_blueprint to retrieve information from Ha Nexus Agent without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why substitute_blueprint is rated Low
The tool renders a blueprint and returns the resulting YAML as a dict — it reads/computes and returns data without creating, modifying, executing, or deleting anything. It is essentially a preview/template-rendering operation with no side effects.
From the tool's definition 'Render a blueprint with the given inputs and return the resulting automation/script YAML as a dict'
Attacks that exploit this kind of access
The rule that runs substitute_blueprint safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Ha Nexus Agent, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For substitute_blueprint, this is the rule to start with:
substitute_blueprint 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 Ha Nexus Agent, apply this rule, and every substitute_blueprint call is checked against it from then on.
Questions about substitute_blueprint
Render a blueprint with the given inputs and return the resulting automation/script YAML as a dict. It is categorised as a Read tool in the Ha Nexus Agent MCP Server, which means it retrieves data without modifying state.
Register the Ha Nexus Agent MCP server in PolicyLayer and add a rule for substitute_blueprint: 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 Ha Nexus Agent. Nothing to install.
substitute_blueprint 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 substitute_blueprint 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 substitute_blueprint. 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.
substitute_blueprint is provided by the Ha Nexus Agent MCP server (fistacho/ha-nexus-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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