feat(tool): add middle truncation to preserve recent content#3
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When tool output exceeds size limits, truncation now defaults to "middle" mode which keeps both the beginning (~30%) and end (~70%) of the output, removing the middle. This ensures recent messages (e.g. latest Slack thread replies, recent errors) are preserved alongside initial context (issue metadata, headers). Previously the default "head" truncation kept only the beginning, causing the most relevant recent content to be lost for long Slack/issue threads in the CX intake flow. Closes CX-3760 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
"middle"truncation direction that keeps both the beginning (~30%) and end (~70%) of tool output, removing the middle"head"to"middle"so recent content (e.g. latest Slack thread replies, recent errors) is preserved alongside initial context (issue metadata, headers)"head"and"tail"directions remain available for explicit useProblem: Long Slack/issue threads in the CX intake flow caused the fetch-issue tool result to be truncated from the end, losing the most recent and relevant messages (e.g., recent errors). The previous
"head"default kept only the beginning of the output.Fix: The 70/30 tail-biased middle truncation ensures both the initial context and recent messages are preserved when output exceeds the 50KB/2000-line limit.
Closes CX-3760
Test plan
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