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feat: extract and surface AI model and version #44

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bb6ee8c
feat: extract and surface AI model (#29)
abhinavgautam01 May 30, 2026
57ca73d
fix: leave model empty when Cursor is detected as co-author
abhinavgautam01 May 31, 2026
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20 changes: 18 additions & 2 deletions detection/coauthor/coauthor.go
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@ var knownCoAuthorEmails = map[string]string{
"noreply@aider.chat": "Aider",
}

var coAuthorPattern = regexp.MustCompile(`(?im)^co-authored-by:\s*[^<]*<([^>]+)>`)
var coAuthorPattern = regexp.MustCompile(`(?im)^co-authored-by:\s*([^<]*)<([^>]+)>`)

type Detector struct{}

Expand All @@ -30,11 +30,27 @@ func (d *Detector) Detect(input detection.Input) []detection.Finding {
seen := map[string]bool{}

for _, match := range matches {
email := strings.ToLower(strings.TrimSpace(match[1]))
namePart := strings.TrimSpace(match[1])
email := strings.ToLower(strings.TrimSpace(match[2]))
if name, ok := knownCoAuthorEmails[email]; ok && !seen[name] {
model := ""
if name == "Aider" && strings.Contains(namePart, "(") {
start := strings.Index(namePart, "(")
end := strings.Index(namePart, ")")
if end > start {
model = namePart[start+1 : end]
}
} else if name == "Claude Code" {
model = namePart
if model == "Claude" {
model = ""
}
}

findings = append(findings, detection.Finding{
Detector: d.Name(),
Tool: name,
Model: model,
Confidence: detection.ConfidenceHigh,
Detail: fmt.Sprintf("Co-Authored-By trailer with email %s", email),
})
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98 changes: 59 additions & 39 deletions detection/coauthor/coauthor_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -9,78 +9,93 @@ import (
func TestDetect(t *testing.T) {
d := &Detector{}
tests := []struct {
name string
message string
wantTools []string
name string
message string
wantTools []string
wantModels []string
}{
{
name: "Claude trailer with Opus model",
message: "fix: update handler\n\nCo-Authored-By: Claude Opus 4 <noreply@anthropic.com>",
wantTools: []string{"Claude Code"},
name: "Claude trailer with Opus model",
message: "fix: update handler\n\nCo-Authored-By: Claude Opus 4 <noreply@anthropic.com>",
wantTools: []string{"Claude Code"},
wantModels: []string{"Claude Opus 4"},
},
{
name: "Claude trailer with Sonnet model",
message: "fix: update handler\n\nCo-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>",
wantTools: []string{"Claude Code"},
name: "Claude trailer with Sonnet model",
message: "fix: update handler\n\nCo-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>",
wantTools: []string{"Claude Code"},
wantModels: []string{"Claude Sonnet 4"},
},
{
name: "Cursor trailer",
message: "refactor: extract method\n\nCo-Authored-By: Cursor <cursoragent@cursor.com>",
wantTools: []string{"Cursor"},
name: "Cursor trailer",
message: "refactor: extract method\n\nCo-Authored-By: Cursor <cursoragent@cursor.com>",
wantTools: []string{"Cursor"},
wantModels: []string{""},
},
{
name: "Aider trailer with model name",
message: "feat: add endpoint\n\nCo-Authored-By: aider (gpt-4o) <noreply@aider.chat>",
wantTools: []string{"Aider"},
name: "Aider trailer with model name",
message: "feat: add endpoint\n\nCo-Authored-By: aider (gpt-4o) <noreply@aider.chat>",
wantTools: []string{"Aider"},
wantModels: []string{"gpt-4o"},
},
{
name: "Aider trailer with different model",
message: "feat: add endpoint\n\nCo-Authored-By: aider (claude-3.5-sonnet) <noreply@aider.chat>",
wantTools: []string{"Aider"},
name: "Aider trailer with different model",
message: "feat: add endpoint\n\nCo-Authored-By: aider (claude-3.5-sonnet) <noreply@aider.chat>",
wantTools: []string{"Aider"},
wantModels: []string{"claude-3.5-sonnet"},
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},
{
name: "multiple trailers with Claude and human",
message: "fix: bug\n\nCo-Authored-By: Claude Opus 4 <noreply@anthropic.com>\nCo-Authored-By: Alice <alice@example.com>",
wantTools: []string{"Claude Code"},
name: "multiple trailers with Claude and human",
message: "fix: bug\n\nCo-Authored-By: Claude Opus 4 <noreply@anthropic.com>\nCo-Authored-By: Alice <alice@example.com>",
wantTools: []string{"Claude Code"},
wantModels: []string{"Claude Opus 4"},
},
{
name: "multiple AI trailers",
message: "fix: bug\n\nCo-Authored-By: Claude Opus 4 <noreply@anthropic.com>\nCo-Authored-By: aider (gpt-4o) <noreply@aider.chat>",
wantTools: []string{"Claude Code", "Aider"},
name: "multiple AI trailers",
message: "fix: bug\n\nCo-Authored-By: Claude Opus 4 <noreply@anthropic.com>\nCo-Authored-By: aider (gpt-4o) <noreply@aider.chat>",
wantTools: []string{"Claude Code", "Aider"},
wantModels: []string{"Claude Opus 4", "gpt-4o"},
},
{
name: "case variation",
message: "fix: thing\n\nco-authored-by: Claude <noreply@anthropic.com>",
wantTools: []string{"Claude Code"},
name: "case variation",
message: "fix: thing\n\nco-authored-by: Claude <noreply@anthropic.com>",
wantTools: []string{"Claude Code"},
wantModels: []string{""},
},
{
name: "CO-AUTHORED-BY uppercase",
message: "fix: thing\n\nCO-AUTHORED-BY: Claude <noreply@anthropic.com>",
wantTools: []string{"Claude Code"},
name: "CO-AUTHORED-BY uppercase",
message: "fix: thing\n\nCO-AUTHORED-BY: Claude <noreply@anthropic.com>",
wantTools: []string{"Claude Code"},
wantModels: []string{""},
},
{
name: "no trailers",
message: "just a normal commit message",
wantTools: nil,
name: "no trailers",
message: "just a normal commit message",
wantTools: nil,
wantModels: nil,
},
{
name: "human co-author only",
message: "pair programming\n\nCo-Authored-By: Bob <bob@company.com>",
wantTools: nil,
name: "human co-author only",
message: "pair programming\n\nCo-Authored-By: Bob <bob@company.com>",
wantTools: nil,
wantModels: nil,
},
{
name: "empty message",
message: "",
wantTools: nil,
name: "empty message",
message: "",
wantTools: nil,
wantModels: nil,
},
}

for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
findings := d.Detect(detection.Input{CommitMessage: tt.message})
gotTools := make([]string, len(findings))
gotModels := make([]string, len(findings))
for i, f := range findings {
gotTools[i] = f.Tool
gotModels[i] = f.Model
if f.Confidence != detection.ConfidenceHigh {
t.Errorf("confidence = %d, want %d", f.Confidence, detection.ConfidenceHigh)
}
Expand All @@ -91,6 +106,7 @@ func TestDetect(t *testing.T) {

if len(gotTools) == 0 {
gotTools = nil
gotModels = nil
}

if len(gotTools) != len(tt.wantTools) {
Expand All @@ -102,6 +118,10 @@ func TestDetect(t *testing.T) {
t.Errorf("tools = %v, want %v", gotTools, tt.wantTools)
return
}
if gotModels[i] != tt.wantModels[i] {
t.Errorf("models = %q, want %q", gotModels, tt.wantModels)
return
}
}
})
}
Expand Down
2 changes: 2 additions & 0 deletions detection/detection.go
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,8 @@ func (c *Confidence) Increment() {
type Finding struct {
Detector string `json:"detector"`
Tool string `json:"tool"`
Model string `json:"model,omitempty"`
Version string `json:"version,omitempty"`
Confidence Confidence `json:"confidence"`
Detail string `json:"detail"`
}
Expand Down
1 change: 1 addition & 0 deletions detection/gitnotes/gitnotes.go
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,7 @@ func (d *Detector) Detect(input detection.Input) []detection.Finding {
findings = append(findings, detection.Finding{
Detector: d.Name(),
Tool: tool,
Model: prompt.AgentID.Model,
Confidence: detection.ConfidenceHigh,
Detail: detail,
})
Expand Down
18 changes: 16 additions & 2 deletions output/output.go
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Expand Up @@ -42,7 +42,7 @@ func FormatText(w io.Writer, report scan.Report) error {
}
fmt.Fprintf(w, "Commit %s\n", cr.Hash[:12])
for _, f := range cr.Findings {
fmt.Fprintf(w, " [%s] %s (%s): %s\n", f.Confidence, f.Tool, f.Detector, f.Detail)
fmt.Fprintf(w, " [%s] %s (%s): %s\n", f.Confidence, formatTool(f), f.Detector, f.Detail)
}
}

Expand All @@ -58,7 +58,7 @@ func FormatTextFindings(w io.Writer, findings []detection.Finding) error {

fmt.Fprintf(w, "Found %d AI signal(s):\n", len(findings))
for _, f := range findings {
fmt.Fprintf(w, " [%s] %s (%s): %s\n", f.Confidence, f.Tool, f.Detector, f.Detail)
fmt.Fprintf(w, " [%s] %s (%s): %s\n", f.Confidence, formatTool(f), f.Detector, f.Detail)
}
return nil
}
Expand All @@ -72,6 +72,20 @@ func FormatJSONFindings(w io.Writer, findings []detection.Finding) error {
}{Findings: findings})
}

func formatTool(f detection.Finding) string {
var extras []string
if f.Model != "" {
extras = append(extras, f.Model)
}
if f.Version != "" {
extras = append(extras, "v"+f.Version)
}
if len(extras) > 0 {
return fmt.Sprintf("%s [%s]", f.Tool, strings.Join(extras, " "))
}
return f.Tool
}

func sortedKeys(m map[string]int) []string {
keys := make([]string, 0, len(m))
for k := range m {
Expand Down
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