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feat: improve context budget truncation notice with total lines and continuation example

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When files are truncated due to context budget limits, the truncation notice now includes:
- Total number of lines in the file
- The next line number to continue from
- A concrete example of the line_range syntax

This helps models understand why they received fewer lines than expected and how to continue reading.

Addresses Issue #10239
This commit is contained in:
Roo Code 2025-12-21 16:28:23 +00:00
parent 78dc34498b
commit 5bf4eec3d8
1 changed files with 3 additions and 2 deletions
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5
src/core/tools/ReadFileTool.ts
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@ -547,8 +547,9 @@ export class ReadFileTool extends BaseTool<"read_file"> {
content = addLineNumbers(result.content)
if (!result.complete) {
// File was truncated
const notice = `File truncated: showing ${result.lineCount} lines (${result.tokenCount} tokens) due to context budget. Use line_range to read specific sections.`
// File was truncated due to context budget
const nextLine = result.lineCount + 1
const notice = `File truncated at line ${result.lineCount} of ${totalLines} total lines due to context budget (${result.tokenCount} tokens used). To continue reading, use the read_file tool again with line_range starting at line ${nextLine} (e.g., <line_range>${nextLine}-${Math.min(nextLine + 499, totalLines)}</line_range>)`
const lineRangeAttr = result.lineCount > 0 ? ` lines="1-${result.lineCount}"` : ""
xmlInfo =
result.lineCount > 0