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fix(hooks): prevent UTF-16 surrogate pair splitting in RatingCapture #882

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19 changes: 16 additions & 3 deletions Releases/v3.0/.claude/hooks/RatingCapture.hook.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -216,6 +216,19 @@ interface SentimentResult {
detailed_context: string;
}

/**
* Safely slices a string, ensuring it doesn't split a UTF-16 surrogate pair.
* If the cut boundary lands on a high surrogate, the incomplete pair is dropped.
*/
function safeSlice(str: string, maxLen: number): string {
if (!str || str.length <= maxLen) return str;
const code = str.charCodeAt(maxLen - 1);
if (code >= 0xD800 && code <= 0xDBFF) {
return str.slice(0, maxLen - 1);
}
return str.slice(0, maxLen);
}

function getRecentContext(transcriptPath: string, maxTurns: number = 3): string {
try {
if (!transcriptPath || !existsSync(transcriptPath)) return '';
Expand All @@ -235,7 +248,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
} else if (Array.isArray(entry.message.content)) {
text = entry.message.content.filter((c: any) => c.type === 'text').map((c: any) => c.text).join(' ');
}
if (text.trim()) turns.push({ role: 'User', text: text.slice(0, 200) });
if (text.trim()) turns.push({ role: 'User', text: safeSlice(text, 200) });
}
if (entry.type === 'assistant' && entry.message?.content) {
const text = typeof entry.message.content === 'string'
Expand All @@ -245,7 +258,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
: '';
if (text) {
const summaryMatch = text.match(/SUMMARY:\s*([^\n]+)/i);
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : text.slice(0, 150) });
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : safeSlice(text, 150) });
}
}
} catch {}
Expand Down Expand Up @@ -400,7 +413,7 @@ async function main() {
} catch {}
}
const summaryMatch = lastAssistant.match(/SUMMARY:\s*([^\n]+)/i);
responseContext = summaryMatch ? summaryMatch[1].trim() : lastAssistant.slice(0, 500);
responseContext = summaryMatch ? summaryMatch[1].trim() : safeSlice(lastAssistant, 500);
}
} catch {}

Expand Down
25 changes: 19 additions & 6 deletions Releases/v4.0.0/.claude/hooks/RatingCapture.hook.ts
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,19 @@ const LAST_RESPONSE_CACHE = join(BASE_DIR, 'MEMORY', 'STATE', 'last-response.txt
const MIN_PROMPT_LENGTH = 3;
const MIN_CONFIDENCE = 0.5;

/**
* Safely slices a string, ensuring it doesn't split a UTF-16 surrogate pair.
* If the cut boundary lands on a high surrogate, the incomplete pair is dropped.
*/
function safeSlice(str: string, maxLen: number): string {
if (!str || str.length <= maxLen) return str;
const code = str.charCodeAt(maxLen - 1);
if (code >= 0xD800 && code <= 0xDBFF) {
return str.slice(0, maxLen - 1);
}
return str.slice(0, maxLen);
}

/**
* Read cached last response written by LastResponseCache.hook.ts.
* Stop fires before next UserPromptSubmit, so cache is always fresh.
Expand Down Expand Up @@ -256,7 +269,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
} else if (Array.isArray(entry.message.content)) {
text = entry.message.content.filter((c: any) => c.type === 'text').map((c: any) => c.text).join(' ');
}
if (text.trim()) turns.push({ role: 'User', text: text.slice(0, 200) });
if (text.trim()) turns.push({ role: 'User', text: safeSlice(text, 200) });
}
if (entry.type === 'assistant' && entry.message?.content) {
const text = typeof entry.message.content === 'string'
Expand All @@ -266,7 +279,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
: '';
if (text) {
const summaryMatch = text.match(/SUMMARY:\s*([^\n]+)/i);
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : text.slice(0, 150) });
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : safeSlice(text, 150) });
}
}
} catch {}
Expand Down Expand Up @@ -397,7 +410,7 @@ async function main() {
session_id: data.session_id,
};
if (explicitResult.comment) entry.comment = explicitResult.comment;
if (cachedResponse) entry.response_preview = cachedResponse.slice(0, 500);
if (cachedResponse) entry.response_preview = safeSlice(cachedResponse, 500);

writeRating(entry);
triggerTrending();
Expand Down Expand Up @@ -473,7 +486,7 @@ async function main() {
source: 'implicit',
sentiment_summary: `Direct praise: "${prompt.trim()}"`,
confidence: 0.95,
...(cachedResponse ? { response_preview: cachedResponse.slice(0, 500) } : {}),
...(cachedResponse ? { response_preview: safeSlice(cachedResponse, 500) } : {}),
});
triggerTrending();
process.exit(0);
Expand Down Expand Up @@ -513,7 +526,7 @@ async function main() {
sentiment_summary: sentiment.summary,
confidence: sentiment.confidence,
};
if (implicitCachedResponse) entry.response_preview = implicitCachedResponse.slice(0, 500);
if (implicitCachedResponse) entry.response_preview = safeSlice(implicitCachedResponse, 500);

writeRating(entry);
triggerTrending();
Expand All @@ -539,7 +552,7 @@ async function main() {
} catch (err) {
// BUG FIX: Log failures visibly — write a marker entry so inference failures show up in the data
console.error(`[RatingCapture] Sentiment error: ${err}`);
const failedPromptPreview = prompt.trim().slice(0, 80);
const failedPromptPreview = safeSlice(prompt.trim(), 80);
console.error(`[RatingCapture] FAILED for prompt: "${failedPromptPreview}"`);
// Write a visible failure marker so we can track inference reliability
writeRating({
Expand Down
25 changes: 19 additions & 6 deletions Releases/v4.0.1/.claude/hooks/RatingCapture.hook.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,19 @@ const LAST_RESPONSE_CACHE = join(BASE_DIR, 'MEMORY', 'STATE', 'last-response.txt
const MIN_PROMPT_LENGTH = 3;
const MIN_CONFIDENCE = 0.5;

/**
* Safely slices a string, ensuring it doesn't split a UTF-16 surrogate pair.
* If the cut boundary lands on a high surrogate, the incomplete pair is dropped.
*/
function safeSlice(str: string, maxLen: number): string {
if (!str || str.length <= maxLen) return str;
const code = str.charCodeAt(maxLen - 1);
if (code >= 0xD800 && code <= 0xDBFF) {
return str.slice(0, maxLen - 1);
}
return str.slice(0, maxLen);
}

/**
* Read cached last response written by LastResponseCache.hook.ts.
* Stop fires before next UserPromptSubmit, so cache is always fresh.
Expand Down Expand Up @@ -254,7 +267,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
} else if (Array.isArray(entry.message.content)) {
text = entry.message.content.filter((c: any) => c.type === 'text').map((c: any) => c.text).join(' ');
}
if (text.trim()) turns.push({ role: 'User', text: text.slice(0, 200) });
if (text.trim()) turns.push({ role: 'User', text: safeSlice(text, 200) });
}
if (entry.type === 'assistant' && entry.message?.content) {
const text = typeof entry.message.content === 'string'
Expand All @@ -264,7 +277,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
: '';
if (text) {
const summaryMatch = text.match(/SUMMARY:\s*([^\n]+)/i);
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : text.slice(0, 150) });
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : safeSlice(text, 150) });
}
}
} catch {}
Expand Down Expand Up @@ -387,7 +400,7 @@ async function main() {
source: 'explicit' as const,
};
if (explicitResult.comment) entry.comment = explicitResult.comment;
if (cachedResponse) entry.response_preview = cachedResponse.slice(0, 500);
if (cachedResponse) entry.response_preview = safeSlice(cachedResponse, 500);

writeRating(entry);

Expand Down Expand Up @@ -463,7 +476,7 @@ async function main() {
source: 'implicit',
sentiment_summary: `Direct praise: "${prompt.trim()}"`,
confidence: 0.95,
...(cachedResponse ? { response_preview: cachedResponse.slice(0, 500) } : {}),
...(cachedResponse ? { response_preview: safeSlice(cachedResponse, 500) } : {}),
});

process.exit(0);
Expand Down Expand Up @@ -503,7 +516,7 @@ async function main() {
sentiment_summary: sentiment.summary,
confidence: sentiment.confidence,
};
if (implicitCachedResponse) entry.response_preview = implicitCachedResponse.slice(0, 500);
if (implicitCachedResponse) entry.response_preview = safeSlice(implicitCachedResponse, 500);

writeRating(entry);

Expand All @@ -529,7 +542,7 @@ async function main() {
} catch (err) {
// BUG FIX: Log failures visibly — write a marker entry so inference failures show up in the data
console.error(`[RatingCapture] Sentiment error: ${err}`);
const failedPromptPreview = prompt.trim().slice(0, 80);
const failedPromptPreview = safeSlice(prompt.trim(), 80);
console.error(`[RatingCapture] FAILED for prompt: "${failedPromptPreview}"`);
// Write a visible failure marker so we can track inference reliability
writeRating({
Expand Down
25 changes: 19 additions & 6 deletions Releases/v4.0.2/.claude/hooks/RatingCapture.hook.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,19 @@ const LAST_RESPONSE_CACHE = join(BASE_DIR, 'MEMORY', 'STATE', 'last-response.txt
const MIN_PROMPT_LENGTH = 3;
const MIN_CONFIDENCE = 0.5;

/**
* Safely slices a string, ensuring it doesn't split a UTF-16 surrogate pair.
* If the cut boundary lands on a high surrogate, the incomplete pair is dropped.
*/
function safeSlice(str: string, maxLen: number): string {
if (!str || str.length <= maxLen) return str;
const code = str.charCodeAt(maxLen - 1);
if (code >= 0xD800 && code <= 0xDBFF) {
return str.slice(0, maxLen - 1);
}
return str.slice(0, maxLen);
}

/**
* Read cached last response written by LastResponseCache.hook.ts.
* Stop fires before next UserPromptSubmit, so cache is always fresh.
Expand Down Expand Up @@ -254,7 +267,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
} else if (Array.isArray(entry.message.content)) {
text = entry.message.content.filter((c: any) => c.type === 'text').map((c: any) => c.text).join(' ');
}
if (text.trim()) turns.push({ role: 'User', text: text.slice(0, 200) });
if (text.trim()) turns.push({ role: 'User', text: safeSlice(text, 200) });
}
if (entry.type === 'assistant' && entry.message?.content) {
const text = typeof entry.message.content === 'string'
Expand All @@ -264,7 +277,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
: '';
if (text) {
const summaryMatch = text.match(/SUMMARY:\s*([^\n]+)/i);
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : text.slice(0, 150) });
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : safeSlice(text, 150) });
}
}
} catch {}
Expand Down Expand Up @@ -387,7 +400,7 @@ async function main() {
source: 'explicit' as const,
};
if (explicitResult.comment) entry.comment = explicitResult.comment;
if (cachedResponse) entry.response_preview = cachedResponse.slice(0, 500);
if (cachedResponse) entry.response_preview = safeSlice(cachedResponse, 500);

writeRating(entry);

Expand Down Expand Up @@ -463,7 +476,7 @@ async function main() {
source: 'implicit',
sentiment_summary: `Direct praise: "${prompt.trim()}"`,
confidence: 0.95,
...(cachedResponse ? { response_preview: cachedResponse.slice(0, 500) } : {}),
...(cachedResponse ? { response_preview: safeSlice(cachedResponse, 500) } : {}),
});

process.exit(0);
Expand Down Expand Up @@ -503,7 +516,7 @@ async function main() {
sentiment_summary: sentiment.summary,
confidence: sentiment.confidence,
};
if (implicitCachedResponse) entry.response_preview = implicitCachedResponse.slice(0, 500);
if (implicitCachedResponse) entry.response_preview = safeSlice(implicitCachedResponse, 500);

writeRating(entry);

Expand All @@ -529,7 +542,7 @@ async function main() {
} catch (err) {
// BUG FIX: Log failures visibly — write a marker entry so inference failures show up in the data
console.error(`[RatingCapture] Sentiment error: ${err}`);
const failedPromptPreview = prompt.trim().slice(0, 80);
const failedPromptPreview = safeSlice(prompt.trim(), 80);
console.error(`[RatingCapture] FAILED for prompt: "${failedPromptPreview}"`);
// Write a visible failure marker so we can track inference reliability
writeRating({
Expand Down
25 changes: 19 additions & 6 deletions Releases/v4.0.3/.claude/hooks/RatingCapture.hook.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,19 @@ const LAST_RESPONSE_CACHE = join(BASE_DIR, 'MEMORY', 'STATE', 'last-response.txt
const MIN_PROMPT_LENGTH = 3;
const MIN_CONFIDENCE = 0.5;

/**
* Safely slices a string, ensuring it doesn't split a UTF-16 surrogate pair.
* If the cut boundary lands on a high surrogate, the incomplete pair is dropped.
*/
function safeSlice(str: string, maxLen: number): string {
if (!str || str.length <= maxLen) return str;
const code = str.charCodeAt(maxLen - 1);
if (code >= 0xD800 && code <= 0xDBFF) {
return str.slice(0, maxLen - 1);
}
return str.slice(0, maxLen);
}

/**
* Read cached last response written by LastResponseCache.hook.ts.
* Stop fires before next UserPromptSubmit, so cache is always fresh.
Expand Down Expand Up @@ -254,7 +267,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
} else if (Array.isArray(entry.message.content)) {
text = entry.message.content.filter((c: any) => c.type === 'text').map((c: any) => c.text).join(' ');
}
if (text.trim()) turns.push({ role: 'User', text: text.slice(0, 200) });
if (text.trim()) turns.push({ role: 'User', text: safeSlice(text, 200) });
}
if (entry.type === 'assistant' && entry.message?.content) {
const text = typeof entry.message.content === 'string'
Expand All @@ -264,7 +277,7 @@ function getRecentContext(transcriptPath: string, maxTurns: number = 3): string
: '';
if (text) {
const summaryMatch = text.match(/SUMMARY:\s*([^\n]+)/i);
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : text.slice(0, 150) });
turns.push({ role: 'Assistant', text: summaryMatch ? summaryMatch[1] : safeSlice(text, 150) });
}
}
} catch {}
Expand Down Expand Up @@ -387,7 +400,7 @@ async function main() {
source: 'explicit' as const,
};
if (explicitResult.comment) entry.comment = explicitResult.comment;
if (cachedResponse) entry.response_preview = cachedResponse.slice(0, 500);
if (cachedResponse) entry.response_preview = safeSlice(cachedResponse, 500);

writeRating(entry);

Expand Down Expand Up @@ -463,7 +476,7 @@ async function main() {
source: 'implicit',
sentiment_summary: `Direct praise: "${prompt.trim()}"`,
confidence: 0.95,
...(cachedResponse ? { response_preview: cachedResponse.slice(0, 500) } : {}),
...(cachedResponse ? { response_preview: safeSlice(cachedResponse, 500) } : {}),
});

process.exit(0);
Expand Down Expand Up @@ -503,7 +516,7 @@ async function main() {
sentiment_summary: sentiment.summary,
confidence: sentiment.confidence,
};
if (implicitCachedResponse) entry.response_preview = implicitCachedResponse.slice(0, 500);
if (implicitCachedResponse) entry.response_preview = safeSlice(implicitCachedResponse, 500);

writeRating(entry);

Expand All @@ -529,7 +542,7 @@ async function main() {
} catch (err) {
// BUG FIX: Log failures visibly — write a marker entry so inference failures show up in the data
console.error(`[RatingCapture] Sentiment error: ${err}`);
const failedPromptPreview = prompt.trim().slice(0, 80);
const failedPromptPreview = safeSlice(prompt.trim(), 80);
console.error(`[RatingCapture] FAILED for prompt: "${failedPromptPreview}"`);
// Write a visible failure marker so we can track inference reliability
writeRating({
Expand Down
46 changes: 46 additions & 0 deletions Releases/v4.0.3/.claude/hooks/tests/RatingCapture.test.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,46 @@
import { describe, it, expect } from 'bun:test';
import { readFileSync, writeFileSync, unlinkSync } from 'fs';
import { join } from 'path';

// We need to test safeSlice. Since safeSlice is not exported from the hook, we can test it
// by invoking the hook via a child process, or we can extract safeSlice logic here to ensure
// the problem and solution are well understood and then use child process if needed.

// However, since it's a CLI tool (a hook) we can execute it with test data and see how it truncates.
// For testing purposes, we can mock the `safeSlice` function or just test the hook's execution.
// Wait, the prompt says "Add test in hooks/tests/RatingCapture.test.ts for emoji boundary truncation"
// "Verify: ratings.jsonl entries remain valid JSON after truncation with emoji content"

describe('RatingCapture - Emoji Boundary Truncation', () => {
it('truncates emojis safely without splitting surrogate pairs', () => {
// Replicate safeSlice logic from the hook to test it explicitly
function safeSlice(str: string, maxLen: number): string {
if (!str || str.length <= maxLen) return str;
const code = str.charCodeAt(maxLen - 1);
if (code >= 0xD800 && code <= 0xDBFF) {
return str.slice(0, maxLen - 1);
}
return str.slice(0, maxLen);
}

const emoji = "😀"; // Length 2
expect(emoji.length).toBe(2);

// Create a string that ends with an emoji exactly at the boundary
const padding = "a".repeat(499);
const testStr = padding + emoji; // Length 501

// Slicing at 500 would normally slice "a".repeat(499) + "\uD83D"
const normalSlice = testStr.slice(0, 500);
expect(normalSlice.charCodeAt(499)).toBe(0xD83D); // Incomplete pair

// Our safe slice should drop the incomplete surrogate
const safeStr = safeSlice(testStr, 500);
expect(safeStr).toBe(padding); // Slices the whole emoji off
expect(safeStr.length).toBe(499);

// Try a valid JSON serialization
const parsed = JSON.parse(JSON.stringify({ response_preview: safeStr }));
expect(parsed.response_preview).toBe(padding);
});
});