Add support to detect Assisted-By trailer

README.md

@@ -104,19 +104,17 @@ import (
 	"fmt"
 
 	"github.com/chaoss/disclosure/detection"
-	"github.com/chaoss/disclosure/detection/coauthor"
 	"github.com/chaoss/disclosure/detection/committer"
-	"github.com/chaoss/disclosure/detection/message"
+	"github.com/chaoss/disclosure/detection/trailer"
 	"github.com/chaoss/disclosure/detection/toolmention"
 	"github.com/chaoss/disclosure/scan"
 )
 
 func main() {
 	detectors := []detection.Detector{
 		&committer.Detector{},
-		&coauthor.Detector{},
-		&message.Detector{},
 		&toolmention.Detector{},
+		&trailer.Detector{},
 	}
 
 	report, err := scan.ScanCommitRange("/path/to/repo", "base..head", detectors)
@@ -169,10 +167,9 @@ go test ./...
 ```
 detection/              Core types: Detector interface, Finding, Confidence, Input
 detection/committer/    Known AI bot committer emails
-detection/coauthor/     Co-Authored-By trailer parsing
 detection/gitnotes/     git-ai authorship logs from refs/notes/ai
-detection/message/      Commit message pattern matching
 detection/toolmention/  AI tool name mentions in text
+detection/trailer/      Look for known trailers in commit message
 gitops/                 go-git wrapper for reading commits
 scan/                   Orchestration: run detectors over commits or text
 output/                 JSON and human-readable text formatters

cmd/cmd.go

@@ -10,11 +10,10 @@ import (
 	"strings"
 
 	"github.com/chaoss/disclosure/detection"
-	"github.com/chaoss/disclosure/detection/coauthor"
 	"github.com/chaoss/disclosure/detection/committer"
 	"github.com/chaoss/disclosure/detection/gitnotes"
-	"github.com/chaoss/disclosure/detection/message"
 	"github.com/chaoss/disclosure/detection/toolmention"
+	"github.com/chaoss/disclosure/detection/trailer"
 	"github.com/chaoss/disclosure/output"
 	"github.com/chaoss/disclosure/scan"
 	"github.com/spf13/cobra"
@@ -33,18 +32,17 @@ const (
 func allDetectors() []detection.Detector {
 	return []detection.Detector{
 		&committer.Detector{},
-		&coauthor.Detector{},
 		&gitnotes.Detector{},
-		&message.Detector{},
+		&trailer.Detector{},
 		&toolmention.Detector{},
 	}
 }
 
 // Run is the main entry point for the CLI. Returns an exit code.
 func Run(args []string, stdout, stderr io.Writer) int {
 	rootCmd := &cobra.Command{
-		Use:           "disclosure",
-		Short:         "Detect AI-generated contributions",
+		Use:   "disclosure",
+		Short: "Detect AI-generated contributions",
 		Long: `Disclosure is a standalone CLI tool that detects AI-generated contributions
 in git repositories. It works entirely from git-level data (commit emails,
 messages, trailers) with no platform API dependencies.

cmd/cmd_test.go

@@ -204,7 +204,7 @@ func TestFilterReport(t *testing.T) {
 				Hash: "abc123",
 				Findings: []detection.Finding{
 					{Detector: "toolmention", Tool: "Claude", Confidence: 1, Detail: "text"},
-					{Detector: "coauthor", Tool: "Claude Code", Confidence: 3, Detail: "trailer"},
+					{Detector: "trailer", Tool: "Claude Code", Confidence: 3, Detail: "trailer"},
 				},
 			},
 		},

detection/committer/committer.go

@@ -7,33 +7,13 @@ import (
 	"github.com/chaoss/disclosure/detection"
 )
 
-// knownAgentCommitters maps GitHub noreply emails to AI tool names.
-var knownAgentCommitters = map[string]string{
-	"209825114+claude[bot]@users.noreply.github.com":               "Claude",
-	"215619710+anthropic-claude[bot]@users.noreply.github.com":     "Claude (Anthropic)",
-	"208546643+claude-code-action[bot]@users.noreply.github.com":   "Claude Code Action",
-	"198982749+copilot@users.noreply.github.com":                   "GitHub Copilot (agent)",
-	"167198135+copilot[bot]@users.noreply.github.com":              "GitHub Copilot (chat)",
-	"206951365+cursor[bot]@users.noreply.github.com":               "Cursor",
-	"215057067+openai-codex[bot]@users.noreply.github.com":         "OpenAI Codex",
-	"199175422+chatgpt-codex-connector[bot]@users.noreply.github.com": "Codex via ChatGPT",
-	"176961590+gemini-code-assist[bot]@users.noreply.github.com":   "Gemini Code Assist",
-	"208079219+amazon-q-developer[bot]@users.noreply.github.com":   "Amazon Q Developer",
-	"158243242+devin-ai-integration[bot]@users.noreply.github.com": "Devin",
-	"205137888+cline[bot]@users.noreply.github.com":                "Cline",
-	"230936708+continue[bot]@users.noreply.github.com":             "Continue.dev",
-	"201248094+sourcegraph-cody[bot]@users.noreply.github.com":     "Sourcegraph Cody",
-	"220155983+jetbrains-ai[bot]@users.noreply.github.com":         "JetBrains AI",
-	"136622811+coderabbitai[bot]@users.noreply.github.com":         "CodeRabbit",
-}
-
 // numericPrefixIndex maps the numeric prefix from GitHub noreply emails to tool names.
 // This handles issue #4: when a bot's username changes, the numeric ID stays the same.
 var numericPrefixIndex map[string]string
 
 func init() {
-	numericPrefixIndex = make(map[string]string, len(knownAgentCommitters))
-	for email, name := range knownAgentCommitters {
+	numericPrefixIndex = make(map[string]string, len(detection.KnownAgentCommitters))
+	for email, name := range detection.KnownAgentCommitters {
 		if idx := strings.Index(email, "+"); idx > 0 {
 			numericPrefixIndex[email[:idx]] = name
 		}
@@ -51,7 +31,7 @@ func (d *Detector) Detect(input detection.Input) []detection.Finding {
 	}
 
 	// Direct match against known emails
-	if name, ok := knownAgentCommitters[email]; ok {
+	if name, ok := detection.KnownAgentCommitters[email]; ok {
 		return []detection.Finding{{
 			Detector:   d.Name(),
 			Tool:       name,
@@ -62,7 +42,7 @@ func (d *Detector) Detect(input detection.Input) []detection.Finding {
 
 	// Numeric prefix match for GitHub noreply emails (#4).
 	// Format: <numeric-id>+<username>@users.noreply.github.com
-	if strings.HasSuffix(email, "@users.noreply.github.com") {
+	if strings.HasSuffix(email, detection.GithubNoReplyEmailSuffix) {
 		if idx := strings.Index(email, "+"); idx > 0 {
 			prefix := email[:idx]
 			if name, ok := numericPrefixIndex[prefix]; ok {

detection/committer/committer_test.go

@@ -8,7 +8,7 @@ import (
 
 func TestDetectAllKnownEmails(t *testing.T) {
 	d := &Detector{}
-	for email, expectedName := range knownAgentCommitters {
+	for email, expectedName := range detection.KnownAgentCommitters {
 		input := detection.Input{CommitEmail: email}
 		findings := d.Detect(input)
 		if len(findings) != 1 {

detection/constants.go

@@ -0,0 +1,90 @@
+package detection
+
+import "regexp"
+
+// KnownAgentCommitters maps GitHub noreply emails to AI tool names.
+var KnownAgentCommitters = map[string]string{
+	"209825114+claude[bot]@users.noreply.github.com":                  "Claude",
+	"215619710+anthropic-claude[bot]@users.noreply.github.com":        "Claude (Anthropic)",
+	"208546643+claude-code-action[bot]@users.noreply.github.com":      "Claude Code Action",
+	"198982749+copilot@users.noreply.github.com":                      "GitHub Copilot (agent)",
+	"167198135+copilot[bot]@users.noreply.github.com":                 "GitHub Copilot (chat)",
+	"206951365+cursor[bot]@users.noreply.github.com":                  "Cursor",
+	"215057067+openai-codex[bot]@users.noreply.github.com":            "OpenAI Codex",
+	"199175422+chatgpt-codex-connector[bot]@users.noreply.github.com": "Codex via ChatGPT",
+	"176961590+gemini-code-assist[bot]@users.noreply.github.com":      "Gemini Code Assist",
+	"208079219+amazon-q-developer[bot]@users.noreply.github.com":      "Amazon Q Developer",
+	"158243242+devin-ai-integration[bot]@users.noreply.github.com":    "Devin",
+	"205137888+cline[bot]@users.noreply.github.com":                   "Cline",
+	"230936708+continue[bot]@users.noreply.github.com":                "Continue.dev",
+	"201248094+sourcegraph-cody[bot]@users.noreply.github.com":        "Sourcegraph Cody",
+	"220155983+jetbrains-ai[bot]@users.noreply.github.com":            "JetBrains AI",
+	"136622811+coderabbitai[bot]@users.noreply.github.com":            "CodeRabbit",
+}
+
+// GithubNoReplyEmailSuffix GitHub noreply emails suffix to check committer emails.
+var GithubNoReplyEmailSuffix = "@users.noreply.github.com"
+
+// SupportedToolsInMentions List of all supported tools to detect in tool mentions within commits.
+var SupportedToolsInMentions = []string{
+	"Claude Code",
+	"Claude",
+	"GitHub Copilot",
+	"Copilot",
+	"Cursor",
+	"Aider",
+	"OpenAI Codex",
+	"Codex",
+	"Gemini Code Assist",
+	"Amazon Q Developer",
+	"Amazon Q",
+	"Devin",
+	"Cline",
+	"Continue.dev",
+	"Sourcegraph Cody",
+	"Cody",
+	"JetBrains AI",
+	"CodeRabbit",
+	"ChatGPT",
+	"t3.chat",
+	"GPT-4",
+	"Windsurf",
+}
+
+// KnownCoAuthorEmails Known emails present with Co-Authored-By trailers
+var KnownCoAuthorEmails = map[string]string{
+	"noreply@anthropic.com":  "Claude Code",
+	"cursoragent@cursor.com": "Cursor",
+	"noreply@aider.chat":     "Aider",
+	"copilot@github.com":     "Copilot",
+}
+
+// CoAuthorPattern Regex to look for Co-Authroed-By trailer with email
+var CoAuthorPattern = regexp.MustCompile(`(?im)^co-authored-by:\s*[^<]*<([^>]+)>`)
+
+// AssistedByPattern Regex to look for Assisted-By trailer with tool name
+var AssistedByPattern = regexp.MustCompile(`(?im)^assisted-by\s*:\s*([^\r\n]+?)\s*$`)
+
+// AiderCommitPrefix The commit prefix added by Aider
+var AiderCommitPrefix = "aider:"
+
+// ClaudeAttributionText
+var ClaudeAttributionText = "Generated with Claude Code"
+
+// EntireIOTrailers List of EntireIO related trailers to check for
+var EntireIOTrailers = []string{
+	"Entire-Metadata",
+	"Entire-Metadata-Task",
+	"Entire-Strategy",
+	"Entire-Session",
+	"Entire-Condensation",
+	"Entire-Source-Ref",
+	"Entire-Checkpoint",
+	"Entire-Agent",
+}
+
+// ReplitAttributionRegex Regex to detect use of Replit Agent or Assistant
+var ReplitAttributionRegex = `(?m)^Replit-Commit-Author:\s*(Agent|Assistant)(?:\r?\nReplit-Commit-Session-Id:\s*([a-fA-F0-9-]+))?(?:\r?\n|$)`
+
+// GitNotesAuthorshipPrefix Authorship prefix to check as a precondition in git notes
+var GitNotesAuthorshipPrefix = "authorship/"