diff --git a/apps/worker/src/services/sarif-report-provider.ts b/apps/worker/src/services/sarif-report-provider.ts
new file mode 100644
index 000000000..e91da64ff
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+++ b/apps/worker/src/services/sarif-report-provider.ts
@@ -0,0 +1,174 @@
+/**
+ * SarifReportOutputProvider — converts Shannon's markdown security report
+ * into SARIF 2.1.0 format for integration with GitHub Code Scanning,
+ * VS Code SARIF Viewer, and other SARIF-consuming tools.
+ *
+ * Reads the assembled `comprehensive_security_assessment_report.md` and
+ * maps markdown finding sections to SARIF result objects with appropriate
+ * severity levels.
+ */
+
+import { fs, path } from 'zx';
+import type { ActivityInput } from '../temporal/activities.js';
+import type { ActivityLogger } from '../types/activity-logger.js';
+import type { ReportOutputProvider } from '../interfaces/report-output-provider.js';
+import { deliverablesDir } from '../paths.js';
+
+/** SARIF 2.1.0 severity level. */
+type SarifLevel = 'error' | 'warning' | 'note' | 'none';
+
+interface SarifResult {
+  ruleId: string;
+  level: SarifLevel;
+  message: { text: string };
+  locations?: Array<{
+    physicalLocation?: {
+      artifactLocation: { uri: string };
+    };
+  }>;
+}
+
+interface SarifReport {
+  $schema: string;
+  version: string;
+  runs: Array<{
+    tool: {
+      driver: {
+        name: string;
+        version: string;
+        informationUri: string;
+        rules: Array<{
+          id: string;
+          shortDescription: { text: string };
+          defaultConfiguration: { level: SarifLevel };
+        }>;
+      };
+    };
+    results: SarifResult[];
+  }>;
+}
+
+/** Map markdown severity headings to SARIF levels. */
+function classifyLevel(heading: string): SarifLevel {
+  const lower = heading.toLowerCase();
+  if (lower.includes('critical') || lower.includes('high')) return 'error';
+  if (lower.includes('medium') || lower.includes('moderate')) return 'warning';
+  if (lower.includes('low') || lower.includes('info')) return 'note';
+  return 'warning';
+}
+
+/** Derive a stable rule ID from a finding heading. */
+function toRuleId(heading: string): string {
+  return heading
+    .replace(/[^a-zA-Z0-9\s]/g, '')
+    .trim()
+    .replace(/\s+/g, '-')
+    .toLowerCase()
+    .slice(0, 64);
+}
+
+/**
+ * Parse markdown report into individual findings.
+ *
+ * Expects sections delimited by `## ` or `### ` headings.
+ * Each section becomes a SARIF result.
+ */
+function parseFindings(markdown: string): Array<{ heading: string; body: string }> {
+  const findings: Array<{ heading: string; body: string }> = [];
+  const lines = markdown.split('\n');
+  let currentHeading = '';
+  let currentBody: string[] = [];
+
+  for (const line of lines) {
+    const headingMatch = line.match(/^#{2,3}\s+(.+)/);
+    if (headingMatch) {
+      if (currentHeading && currentBody.length > 0) {
+        findings.push({ heading: currentHeading, body: currentBody.join('\n').trim() });
+      }
+      currentHeading = headingMatch[1]!;
+      currentBody = [];
+    } else {
+      currentBody.push(line);
+    }
+  }
+
+  // Push final section
+  if (currentHeading && currentBody.length > 0) {
+    findings.push({ heading: currentHeading, body: currentBody.join('\n').trim() });
+  }
+
+  return findings;
+}
+
+export class SarifReportOutputProvider implements ReportOutputProvider {
+  async generate(input: ActivityInput, logger: ActivityLogger): Promise<{ outputPath?: string }> {
+    const dir = deliverablesDir(input.repoPath, input.deliverablesSubdir);
+    const reportPath = path.join(dir, 'comprehensive_security_assessment_report.md');
+
+    if (!(await fs.pathExists(reportPath))) {
+      logger.info('No markdown report found; skipping SARIF generation');
+      return {};
+    }
+
+    const markdown = await fs.readFile(reportPath, 'utf8');
+    const findings = parseFindings(markdown);
+
+    if (findings.length === 0) {
+      logger.info('No findings parsed from report; skipping SARIF generation');
+      return {};
+    }
+
+    const rules = new Map<string, { id: string; shortDescription: { text: string }; defaultConfiguration: { level: SarifLevel } }>();
+    const results: SarifResult[] = [];
+
+    for (const finding of findings) {
+      const ruleId = toRuleId(finding.heading);
+      const level = classifyLevel(finding.heading);
+
+      if (!rules.has(ruleId)) {
+        rules.set(ruleId, {
+          id: ruleId,
+          shortDescription: { text: finding.heading },
+          defaultConfiguration: { level },
+        });
+      }
+
+      results.push({
+        ruleId,
+        level,
+        message: { text: finding.body.slice(0, 2000) }, // SARIF recommends concise messages
+        locations: [
+          {
+            physicalLocation: {
+              artifactLocation: { uri: input.url },
+            },
+          },
+        ],
+      });
+    }
+
+    const sarif: SarifReport = {
+      $schema: 'https://docs.oasis-open.org/sarif/sarif/v2.1.0/cos02/schemas/sarif-schema-2.1.0.json',
+      version: '2.1.0',
+      runs: [
+        {
+          tool: {
+            driver: {
+              name: 'Shannon',
+              version: '1.0.0',
+              informationUri: 'https://github.com/KeygraphHQ/shannon',
+              rules: [...rules.values()],
+            },
+          },
+          results,
+        },
+      ],
+    };
+
+    const sarifPath = path.join(dir, 'report.sarif');
+    await fs.writeFile(sarifPath, JSON.stringify(sarif, null, 2));
+    logger.info(`SARIF report written to ${sarifPath} (${results.length} findings)`);
+
+    return { outputPath: sarifPath };
+  }
+}