Peeking Under the Hood with Claude Code

A network-traffic inspection of Claude Code using proxymock found that the CLI communicates with Anthropic through REST/JSON requests to the Messages API, rather than the gRPC approach used by some competing tools, which may improve compatibility with corporate firewalls. The observed workflow showed Claude expanding short user prompts into more detailed task instructions, decomposing work into structured tool calls, and requesting permissioned, sandboxed local commands whose results can include directory listings and file contents, making the contents of a working directory important for data-security considerations. The analysis also identified profile and billing-related API calls and extensive telemetry sent to Statsig and Datadog, including session, account, organization, environment, model, token, cost, performance, and command-execution metadata. While the inspection was not presented as reverse engineering, it highlights the tradeoff between Claude Code’s agentic capabilities and the sharing of repository context and usage data with external services.

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