An undocumented setting in Claude Code, named `skillListingBudgetFraction`, is causing custom skills to intermittently fail. This setting limits the percentage of the remaining context window that Claude Code can use for listing available skills. As conversations lengthen and the remaining context budget shrinks, the token count for skill listings also decreases, leading Claude Code to drop skills from the list presented to the model. This results in skills becoming unavailable without any error messages, particularly in longer chat sessions. AI
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IMPACT This issue highlights potential limitations in how AI models manage context and available tools, impacting the reliability of custom skill integrations.
RANK_REASON The article details a specific undocumented setting within an existing product (Claude Code) that causes unexpected behavior, rather than a new product launch or major update.