2 files changed, 60 insertions, 0 deletions
diff --git a/internal/task/changestats.go b/internal/task/changestats.go
new file mode 100644
index 0000000..95be8ec
--- /dev/null
+++ b/internal/task/changestats.go
@@ -0,0 +1,47 @@
+package task
+
+import (
+	"bufio"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// gitDiffStatRe matches git diff --stat summary lines, e.g.:
+//
+//	"3 files changed, 50 insertions(+), 10 deletions(-)"
+//	"1 file changed, 5 insertions(+)"
+//	"1 file changed, 3 deletions(-)"
+var gitDiffStatRe = regexp.MustCompile(`(\d+) files? changed(?:, (\d+) insertions?\(\+\))?(?:, (\d+) deletions?\(-\))?`)
+
+// ParseChangestatFromOutput scans text for git diff --stat summary lines and
+// returns the first match as a Changestats value. Returns nil if no match found.
+func ParseChangestatFromOutput(output string) *Changestats {
+	scanner := bufio.NewScanner(strings.NewReader(output))
+	for scanner.Scan() {
+		line := scanner.Text()
+		if m := gitDiffStatRe.FindStringSubmatch(line); m != nil {
+			cs := &Changestats{}
+			cs.FilesChanged, _ = strconv.Atoi(m[1])
+			if m[2] != "" {
+				cs.LinesAdded, _ = strconv.Atoi(m[2])
+			}
+			if m[3] != "" {
+				cs.LinesRemoved, _ = strconv.Atoi(m[3])
+			}
+			return cs
+		}
+	}
+	return nil
+}
+
+// ParseChangestatFromFile reads a log file and extracts the first git diff stat
+// summary it finds. Returns nil if the file cannot be read or contains no match.
+func ParseChangestatFromFile(path string) *Changestats {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil
+	}
+	return ParseChangestatFromOutput(string(data))
+}
diff --git a/internal/task/task.go b/internal/task/task.go
index 69da5f3..6a9d1db 100644
--- a/internal/task/task.go
+++ b/internal/task/task.go
@@ -48,6 +48,19 @@ type RetryConfig struct {
 	Backoff     string `yaml:"backoff"      json:"backoff"` // "linear", "exponential"
 }
 
+// GitCommit represents a single git commit created during a task execution.
+type GitCommit struct {
+	Hash    string `json:"hash"`
+	Message string `json:"message"`
+}
+
+// Changestats records file/line change metrics from an agent execution.
+type Changestats struct {
+	FilesChanged int `json:"files_changed"`
+	LinesAdded   int `json:"lines_added"`
+	LinesRemoved int `json:"lines_removed"`
+}
+
 // Interaction records a single question/answer exchange between an agent and the user.
 type Interaction struct {
 	QuestionText string    `json:"question_text"`