Function toCompactBlock

src/utils/permissions/yoloClassifier.ts:384–424

* Serialize a single transcript block as a JSONL dict line: `{"Bash":"ls"}` * for tool calls, `{"user":"text"}` for user text. The tool value is the * per-tool `toAutoClassifierInput` projection. JSON escaping means hostile * content can't break out of its string context to forge a `{"user":...}`

(
  block: TranscriptBlock,
  role: TranscriptEntry['role'],
  lookup: ToolLookup,
)

 * Returns '' for tool_use blocks whose tool encodes to ''.
 */
function toCompactBlock(
  block: TranscriptBlock,
  role: TranscriptEntry['role'],
  lookup: ToolLookup,
): string {
  if (block.type === 'tool_use') {
    const tool = lookup.get(block.name)
    if (!tool) return ''
    const input = (block.input ?? {}) as Record<string, unknown>
    // block.input is unvalidated model output from history — a tool_use rejected
    // for bad params (e.g. array emitted as JSON string) still lands in the
    // transcript and would crash toAutoClassifierInput when it assumes z.infer<Input>.
    // On throw or undefined, fall back to the raw input object — it gets
    // single-encoded in the jsonStringify wrap below (no double-encode).
    let encoded: unknown
    try {
      encoded = tool.toAutoClassifierInput(input) ?? input
    } catch (e) {
      logForDebugging(
        `toAutoClassifierInput failed for ${block.name}: ${errorMessage(e)}`,
      )
      logEvent('tengu_auto_mode_malformed_tool_input', {
        toolName:
          block.name as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
      })
      encoded = input
    }
    if (encoded === '') return ''
    if (isJsonlTranscriptEnabled()) {
      return jsonStringify({ [block.name]: encoded }) + '\n'
    }
    const s = typeof encoded === 'string' ? encoded : jsonStringify(encoded)
    return `${block.name} ${s}\n`
  }
  if (block.type === 'text' && role === 'user') {
    return isJsonlTranscriptEnabled()
      ? jsonStringify({ user: block.text }) + '\n'
      : `User: ${block.text}\n`
  }
  return ''
}

function toCompact(entry: TranscriptEntry, lookup: ToolLookup): string {
  return entry.content.map(b => toCompactBlock(b, entry.role, lookup)).join('')