diff --git a/.changeset/coverage-api.md b/.changeset/coverage-api.md
new file mode 100644
index 0000000..9866b5b
--- /dev/null
+++ b/.changeset/coverage-api.md
@@ -0,0 +1,5 @@
+---
+'@smooai/testing': minor
+---
+
+SMOODEV-2721: coverage API — `reportCoverage()`, `listCoverage()` (incl. `latest=true` per-scope baseline), exported `parseLcov()` (LF/LH with DA-fallback), and the high-level `reportCoverageFromLcov(path, { scope, branch, commitSha })` that parses an lcov.info and uploads totals + per-file counters (per-file dropped above the API's 5000-file cap).
diff --git a/src/lib/index.ts b/src/lib/index.ts
index 305d84a..ebcb981 100644
--- a/src/lib/index.ts
+++ b/src/lib/index.ts
@@ -4,6 +4,9 @@
 
 import { readFileSync } from 'fs';
 import type {
+    CoverageFileCounters,
+    CoverageReport,
+    CreateCoverageReportInput,
     CtrfReport,
     CreateDeploymentInput,
     CreateTestCaseInput,
@@ -11,6 +14,8 @@ import type {
     CreateTestRunInput,
     Credentials,
     Deployment,
+    LcovSummary,
+    ListCoverageReportsFilters,
     ListDeploymentsFilters,
     ListTestCasesFilters,
     ListTestRunsFilters,
@@ -245,4 +250,117 @@ export class SmooTestingClient {
 
         return this.getRun(run.id);
     }
+
+    // ── Coverage (SMOODEV-2721) ──
+
+    async reportCoverage(input: CreateCoverageReportInput): Promise<CoverageReport> {
+        return this.request<CoverageReport>('POST', '/testing/coverage', input);
+    }
+
+    /**
+     * List coverage reports. With `{ latest: true, branch }` returns the latest
+     * report per scope on that branch (a bare array — the diff baseline);
+     * otherwise a paginated envelope.
+     */
+    async listCoverage(filters?: ListCoverageReportsFilters): Promise<CoverageReport[] | PaginatedResponse<CoverageReport>> {
+        const qs = this.buildQueryString(filters as Record<string, string | number | undefined>);
+        return this.request<CoverageReport[] | PaginatedResponse<CoverageReport>>('GET', `/testing/coverage${qs}`);
+    }
+
+    /**
+     * High-level: parse an LCOV file and upload its summary for a scope.
+     * Per-file detail is dropped above the API's 5000-file cap.
+     */
+    async reportCoverageFromLcov(
+        lcovFilePath: string,
+        options: {
+            scope: string;
+            branch: string;
+            commitSha: string;
+            testRunId?: string;
+            includeFiles?: boolean;
+        },
+    ): Promise<CoverageReport> {
+        const summary = parseLcov(readFileSync(lcovFilePath, 'utf-8'));
+        const includeFiles = options.includeFiles !== false && Object.keys(summary.files).length <= 5000;
+        return this.reportCoverage({
+            scope: options.scope,
+            branch: options.branch,
+            commitSha: options.commitSha,
+            testRunId: options.testRunId,
+            linesCovered: summary.linesCovered,
+            linesTotal: summary.linesTotal,
+            ...(summary.branchesTotal > 0 ? { branchesCovered: summary.branchesCovered, branchesTotal: summary.branchesTotal } : {}),
+            ...(summary.functionsTotal > 0 ? { functionsCovered: summary.functionsCovered, functionsTotal: summary.functionsTotal } : {}),
+            ...(includeFiles ? { files: summary.files } : {}),
+        });
+    }
+}
+
+/**
+ * Parse LCOV text into totals + per-file counters. Prefers `LF:`/`LH:` and
+ * falls back to counting `DA:` lines when an emitter omits them.
+ */
+export function parseLcov(text: string): LcovSummary {
+    const summary: LcovSummary = {
+        linesCovered: 0,
+        linesTotal: 0,
+        branchesCovered: 0,
+        branchesTotal: 0,
+        functionsCovered: 0,
+        functionsTotal: 0,
+        files: {},
+    };
+    let path: string | null = null;
+    let counters = [0, 0, 0, 0, 0, 0] as CoverageFileCounters;
+    let daFound = 0;
+    let daHit = 0;
+    let sawLf = false;
+
+    for (const rawLine of text.split('\n')) {
+        const line = rawLine.trim();
+        if (line.startsWith('SF:')) {
+            path = line.slice(3).trim();
+            counters = [0, 0, 0, 0, 0, 0];
+            daFound = 0;
+            daHit = 0;
+            sawLf = false;
+        } else if (path == null) {
+            continue;
+        } else if (line.startsWith('LF:')) {
+            counters[1] = Number(line.slice(3)) || 0;
+            sawLf = true;
+        } else if (line.startsWith('LH:')) {
+            counters[0] = Number(line.slice(3)) || 0;
+        } else if (line.startsWith('BRF:')) {
+            counters[3] = Number(line.slice(4)) || 0;
+        } else if (line.startsWith('BRH:')) {
+            counters[2] = Number(line.slice(4)) || 0;
+        } else if (line.startsWith('FNF:')) {
+            counters[5] = Number(line.slice(4)) || 0;
+        } else if (line.startsWith('FNH:')) {
+            counters[4] = Number(line.slice(4)) || 0;
+        } else if (line.startsWith('DA:')) {
+            daFound += 1;
+            const hit = Number(line.slice(3).split(',')[1]);
+            if (hit > 0) daHit += 1;
+        } else if (line === 'end_of_record') {
+            if (!sawLf) {
+                counters[1] = daFound;
+                counters[0] = daHit;
+            }
+            summary.files[path] = counters;
+            summary.linesCovered += counters[0];
+            summary.linesTotal += counters[1];
+            summary.branchesCovered += counters[2];
+            summary.branchesTotal += counters[3];
+            summary.functionsCovered += counters[4];
+            summary.functionsTotal += counters[5];
+            path = null;
+        }
+    }
+    if (Object.keys(summary.files).length === 0) {
+        throw new Error('no SF:/end_of_record records found — is this an LCOV file?');
+    }
+    return summary;
 }
diff --git a/src/lib/parse-lcov.test.ts b/src/lib/parse-lcov.test.ts
new file mode 100644
index 0000000..701562a
--- /dev/null
+++ b/src/lib/parse-lcov.test.ts
@@ -0,0 +1,41 @@
+import { describe, expect, it } from 'vitest';
+import { parseLcov } from './index';
+
+const LCOV = [
+    'TN:',
+    'SF:src/a.ts',
+    'FNF:4',
+    'FNH:3',
+    'DA:1,1',
+    'DA:2,0',
+    'LF:10',
+    'LH:7',
+    'BRF:6',
+    'BRH:2',
+    'end_of_record',
+    'SF:src/b.ts',
+    'DA:1,5',
+    'DA:2,0',
+    'DA:3,1',
+    'end_of_record',
+    '',
+].join('\n');
+
+describe('parseLcov', () => {
+    it('sums LF/LH and derives from DA when absent', () => {
+        const s = parseLcov(LCOV);
+        // a.ts uses LF/LH (10/7) — DA lines must not override them.
+        expect(s.files['src/a.ts']).toEqual([7, 10, 2, 6, 3, 4]);
+        // b.ts has no LF/LH — derived from DA: 3 lines, 2 hit.
+        expect(s.files['src/b.ts']).toEqual([2, 3, 0, 0, 0, 0]);
+        expect(s.linesCovered).toBe(9);
+        expect(s.linesTotal).toBe(13);
+        expect(s.branchesTotal).toBe(6);
+        expect(s.functionsCovered).toBe(3);
+    });
+
+    it('rejects non-lcov input', () => {
+        expect(() => parseLcov('{"not":"lcov"}')).toThrow(/LCOV/);
+        expect(() => parseLcov('')).toThrow(/LCOV/);
+    });
+});
diff --git a/src/lib/types.ts b/src/lib/types.ts
index da49193..3f07202 100644
--- a/src/lib/types.ts
+++ b/src/lib/types.ts
@@ -321,3 +321,66 @@ export interface SmooTestingClientOptions {
     apiUrl?: string;
     authUrl?: string;
 }
+
+// ── Coverage (SMOODEV-2721) ──
+
+/** Per-file coverage counters: [linesHit, linesFound, branchesHit, branchesFound, functionsHit, functionsFound]. */
+export type CoverageFileCounters = [number, number, number, number, number, number];
+
+export interface CoverageReport {
+    id: string;
+    organizationId: string;
+    testRunId: string | null;
+    scope: string;
+    branch: string;
+    commitSha: string;
+    format: string;
+    linesCovered: number;
+    linesTotal: number;
+    branchesCovered: number | null;
+    branchesTotal: number | null;
+    functionsCovered: number | null;
+    functionsTotal: number | null;
+    /** Present on the POST echo; list reads return null (stripped server-side). */
+    files: Record<string, CoverageFileCounters> | null;
+    metadata: Record<string, unknown> | null;
+    createdAt: string;
+}
+
+export interface CreateCoverageReportInput {
+    scope: string;
+    branch: string;
+    commitSha: string;
+    linesCovered: number;
+    linesTotal: number;
+    branchesCovered?: number;
+    branchesTotal?: number;
+    functionsCovered?: number;
+    functionsTotal?: number;
+    testRunId?: string;
+    format?: string;
+    /** Max 5000 entries — the API rejects larger; drop per-file detail instead. */
+    files?: Record<string, CoverageFileCounters>;
+    metadata?: Record<string, unknown>;
+}
+
+export interface ListCoverageReportsFilters {
+    branch?: string;
+    scope?: string;
+    commitSha?: string;
+    /** With `branch`: return the latest report per scope (bare array, the baseline). */
+    latest?: boolean;
+    limit?: number;
+    offset?: number;
+}
+
+/** Parsed LCOV summary produced by `parseLcov`. */
+export interface LcovSummary {
+    linesCovered: number;
+    linesTotal: number;
+    branchesCovered: number;
+    branchesTotal: number;
+    functionsCovered: number;
+    functionsTotal: number;
+    files: Record<string, CoverageFileCounters>;
+}