Method estimateTokens

src/agent/loop.ts:2659–2670

(messages: Message[])

      // head + "[N chars spilled — full output: <path>]" + tail, so the model
      // keeps status lines and tail errors AND knows how to read the rest
      // (read_file with offset/limit). isError and metadata pass through
      // untouched. Runs BEFORE the read-only cache store so a cache hit can
      // never resurrect the full-size copy. Best-effort: a failed spill must
      // never eat the result.
      const spillMax = this.config.tools?.maxResultChars ?? 16_000;
      if (spillMax > 0 && typeof result.content === 'string' && result.content.length > spillMax) {
        try {
          const spill = await applySpillGuard(tc.function.name, sessionId, result.content, {
            maxResultChars: spillMax,
          });
          if (spill.spilled) {
            logger.info('Tool result spilled to disk', {
              tool: tc.function.name,
              chars: result.content.length,
              spillPath: spill.spillPath,