Channels reference changedchannels-reference
Nearest release: v2.1.236, published 2 hours after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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14 Aug 2026
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Recorded edits15to this page, all time
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474474For `input_preview`, Claude Code applies the 3,500 limit to each top-level field of the arguments separately and keeps the JSON's own structural quotes. Clients before v2.1.211 relay `description` raw and cut `input_preview` to 200 UTF-16 units with a trailing ellipsis.
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476Clients on Claude Code v2.1.234 or later relay the marker `(value unserializable)` in place of an `input_preview` field value they can't serialize safely, such as a circular structure or an extremely large array. You still receive the field's key, and the preview's other fields are unchanged.
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476478Clients on Claude Code v2.1.234 or later also mask credentials in `description` and `input_preview`. You receive `[REDACTED]` in place of a recognizable provider credential token, such as an API key or a personal access token. Expect three effects of the masking when you render the fields:
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478480* Claude Code masks key names inside `input_preview` as well as their values. A key name you display may not match the key name in the input.
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