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Blueprint: Analytical Budget Shield

Predictive Pricing Gating for Research Agents​

Autonomous research agents (e.g., GPT-Researcher) can generate extremely long prompts by pulling in large amounts of web context. Without gating, a single request can cost several dollars.

This blueprint demonstrates Predictive Gating where the Gateway rejects a request before it is sent to OpenAI if the predicted cost exceeds a threshold.

Architecture​

1. Master Policy Definition​

{
  "name": "analytical-research-policy",
  "priority": 8500,
  "rules": [
    {
      "id": "allow-research-model",
      "effect": "allow",
      "principals": ["agent:research-bot"],
      "actions": ["llm.generate"],
      "resources": ["model/gpt-4o"]
    }
  ],
  "cost_policy": {
    "max_cost_per_request": 0.5
  }
}

2. Implementation​

Python Prototype​

from openai import OpenAI

client = OpenAI(
    api_key="ignored",
    base_url="http://cz-gateway:8001/v1",
    default_headers={"X-ControlZero-Agent-ID": "research-bot"}
)

def run_deep_research(context_snippets: list):
    # Aggregated context could be 100k+ tokens
    full_prompt = "Summarize these documents: " + " ".join(context_snippets)

    try:
        # The Gateway calculates the cost based on prompt length
        # and current GPT-4o pricing (e.g., $5 per 1M tokens)
        response = client.chat.completions.create(
            model="gpt-4o",
            messages=[{"role": "user", "content": full_prompt}]
        )
        return response.choices[0].message.content
    except Exception as e:
        # Gateway returns a 403 with the predicted cost
        return f"Budget Intervention: {e}"

# Scenario: Massive context that would cost $0.75
massive_context = ["Relevant data..."] * 150000
print(run_deep_research(massive_context))

3. Validation Checklist​

  • Price Table Update: Ensure the Control Zero engine has the latest pricing data for the models being used.
  • Token Estimation: Verify that the tokenizer used by the Gateway (tiktoken) matches the upstream provider's calculation.
  • Error Messaging: Confirm the 403 message includes both the predicted_cost and the max_allowed value. 埋