{"version":"2.1.91","anchor":"write-tool-append-mode-gradual-rollout","canonical_anchor":"write-tool-append-mode-gradual-rollout","heading":"Write Tool Append Mode [Gradual Rollout]","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.91\/e\/write-tool-append-mode-gradual-rollout","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.91","markdown":"### Write Tool Append Mode [Gradual Rollout]\n\n**What**\n\nThe Write tool gains a `mode` parameter with `'overwrite'` (default) and `'append'` options, allowing content to be added to the end of a file without rewriting it.\n\n**Status**\n\nFeature-flagged via `tengu_maple_forge_w8k` (default: false)\n\n**Details**\n\n- New `mode` parameter on the Write tool schema\n- Description: \"Use 'append' to add content to the end of an existing file instead of rewriting the full content \u2014 e.g. for logs, accumulating output, or adding entries\"\n- Instruction: \"Do NOT re-send the existing file contents\" when appending\n\n**Evidence**\n\nWrite append mode (gated by `tengu_maple_forge_w8k`, search for `\"mode:'append'\"`)"}