What data do coding agents send, and where to?

Our report seeks to answer some of our questions for seven of the most popular agentic code editors and plugins. By intercepting and analysing their network flows across a set of standardised tasks, we aim to gain insight into the behaviour, privacy implications, and telemetry patterns of these tools in real-world scenarios. Incidentally, a side-effect was running into OWASP LLM07:2025 System Prompt Leakage for three of the chosen coding agents. You can see the system prompts in the appendix.