AI Coding Tool Telemetry: What Your Tools Send Home and How to Lock Them Down
March 19, 2026 · 11 min read · Privacy, Telemetry, Security
81% of developers worry about AI tool privacy according to Stack Overflow's 2025 survey, but only 29% actually trust these tools with their data. Most developers have no idea what Cursor, Copilot, Claude Code, and Windsurf actually transmit, how long data is retained, or who can access it. This tool-by-tool breakdown covers exact telemetry, retention periods, and the specific settings to disable data collection.
The Privacy Scorecard: How Tools Rank
A peer-reviewed study on arXiv evaluated five major AI coding providers across 14 criteria. Google Gemini scored highest (89.25/100), followed by Anthropic Claude (81.88), GitHub Copilot (78.75), Amazon Q Developer (72.38), and OpenAI GPT (68.00). Only Anthropic implements opt-in consent by default — the other four use opt-out models where your code is collected for training unless you explicitly disable it.
GitHub Copilot: Tier-Dependent Privacy
Copilot Individual retains prompts and suggestions by default when telemetry is enabled, and uses your data for model training on an opt-out basis. Business and Enterprise tiers retain neither prompts nor suggestions, and never use data for training. GitGuardian found that 6.4% of Copilot-active repos leaked secrets — 40% higher than the baseline rate across all public repositories.
Cursor: Three Privacy Modes
Cursor offers Share Data (default, collects everything), Privacy Mode with Storage (no training, limited storage for features), and Ghost Mode (zero retention, but disables Background Agents and indexing). All requests route through Cursor's backend even with BYOK. Cursor inherits VS Code telemetry and adds its own via api3.cursor.sh.
Claude Code: Transparent Telemetry
Claude Code sends prompts and outputs to Anthropic's API (TLS encrypted), plus Statsig metrics and Sentry errors (no code or file paths). Opting in to training means 5-year retention; opting out means 30 days. Enterprise offers zero data retention. All non-essential telemetry can be disabled with CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1.
BYOK Tools: The Privacy Advantage
Aider, Cline, and Roo Code use bring-your-own-key architecture — code goes directly to your chosen provider with no intermediary. Both Cline and Roo Code collect anonymous PostHog telemetry (no code or prompts) that can be disabled. Aider with local Ollama models sends zero data off your machine.
Lock Down Your Tools
Audit your current privacy settings, understand your tier's data handling, use content exclusions for sensitive files, prefer BYOK for regulated codebases, and vet all extensions after Microsoft discovered 900,000 malicious AI extension installs in March 2026. Track your AI tool usage locally with BurnRate: brew install burnrate-dev/tap/burnrate
Sources: Stack Overflow 2025 Developer Survey, arXiv Privacy Scorecard, Anthropic Claude Code Data Usage Docs, Cursor Data Use Overview, GitHub Copilot Metrics Data, GitGuardian Copilot Privacy Analysis, Windsurf Security, Microsoft Security Blog.