Developer finds session length degrades Kiro CLI performance due to context window limits

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A developer who relies on Kiro CLI daily for AWS tasks observed that the tool's performance noticeably declined after extended sessions, producing repetitive, vague, or outdated responses. The root cause was identified as context window saturation — as conversations, file reads, and command outputs accumulate, the AI model struggles to prioritize relevant information. Managing multiple AWS accounts accelerates the problem, filling the context window up to three times faster due to larger command outputs. When the window reaches capacity, Kiro auto-compacts by summarizing past exchanges, but this process loses critical details such as specific policy ARNs or configuration values. The developer resolved the issue by starting a fresh session for each distinct task, keeping context lean and maintaining consistent tool performance throughout the workday.

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