Surfil

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About Surfil

Surfil acts as a control plane for AI coding agents such as Claude Code, Cursor, Codex and Copilot. It installs locally with a single command and monitors agent activity without altering workflows. The tool measures token usage, intercepts requests containing secrets, and tracks shared context to prevent redundant work. It provides signed receipts for all measurements, allowing verification without an account. Surfil runs entirely on the user’s machine, ensuring source code and data never leave the local environment. The system tracks cost breakdowns by request, identifies recoverable waste, and flags outdated knowledge to prevent agents from relying on stale information. It supports multiple agents simultaneously and maintains a ledger of all interactions for auditing purposes.

Key features

Local installation with one command
Real-time token usage measurement
Secret interception and blocking
Context sharing and memory tracking
Signed receipt generation for verification
Multi-agent support
Cost breakdown by request
Offline verification of measurements

Use cases

Auditing AI agent spending and identifying cost waste
Preventing accidental leakage of API keys or tokens
Tracking shared context to avoid redundant agent work

Pros

Measures actual token usage and cost breakdowns per request
Intercepts and blocks requests containing secrets or sensitive data
Tracks shared context to prevent redundant work and forgetting
Provides signed receipts for all measurements, verifiable offline
Runs entirely on local machine without sending source code externally

Cons

Requires Mac, Linux or Windows computer to run
No free tier available
Pricing based on signed outputs rather than usage
Limited to desktop environments

Frequently asked questions about Surfil

What is Surfil and what does it do?

Surfil is a control plane for AI coding agents like Claude Code, Cursor, Codex, and Copilot. It installs locally and monitors agent activity without altering workflows, measuring token usage, intercepting requests containing secrets, and tracking shared context to prevent redundant work.

Who should use Surfil?

Surfil is designed for developers and teams using AI coding agents who want visibility into costs, security risks, and memory inefficiencies. It is particularly useful for those concerned about token waste, secret leaks, or outdated agent knowledge.

How does Surfil handle pricing and billing?

Surfil measures token usage and cost breakdowns directly from the provider’s token counts, providing a request-by-request breakdown. It does not rely on estimates or percentages, ensuring transparency in billing.

Does Surfil integrate with existing AI coding tools?

Yes, Surfil works with popular AI coding agents such as Claude Code, Cursor, Codex, Copilot, and MCP agents. It installs alongside these tools without requiring changes to their configuration or workflows.

Can Surfil prevent secret leaks from AI agents?

Surfil intercepts requests before they leave the machine and blocks those containing API keys, tokens, or hidden instructions. It provides visibility into potential leaks and allows users to review and approve actions before they are executed.

How do I get started with Surfil?

Surfil can be installed with a single command in the terminal. Once installed, it runs alongside your existing AI coding agents, monitoring their activity and providing signed receipts for all measurements without requiring an account.