How to Monitor Claude Code Transcripts Without Rescanning the Entire Archive

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Developers who accumulate months of Claude Code session history face a performance problem: polling tools that rescan every transcript on each tick become slower as the archive grows. The solution involves a lightweight discovery pass that tracks each file's identity, size, and modification time, so only new or changed files enter the parsing queue. An append-aware cursor then reads only the newly added bytes from a known offset, rather than re-parsing the full file from the start. The approach also requires safe handling of edge cases such as truncated files, mid-line reads, and session identity mismatches to avoid silently dropping records. Agent Island, a free open-source status companion for Claude Code on macOS and Windows, applies these principles to read local session data without uploading it to any external server.

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