diff --git a/src/index.ts b/src/index.ts
index e7e9d00..1528c44 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -49,6 +49,7 @@ import { registerScanSessions } from "./tools/scan-sessions.js";
 import { registerGenerateScorecard } from "./tools/generate-scorecard.js";
 import { registerSearchContracts } from "./tools/search-contracts.js";
 import { registerEstimateCost } from "./tools/estimate-cost.js";
+import { registerExportReport } from "./tools/export-report.js";
 
 // Validate related projects from config
 function validateRelatedProjects(): void {
@@ -110,6 +111,7 @@ const toolRegistry: Array<[string, RegisterFn]> = [
   ["generate_scorecard", registerGenerateScorecard],
   ["estimate_cost", registerEstimateCost],
   ["search_contracts", registerSearchContracts],
+  ["export_report", registerExportReport],
 ];
 
 let registered = 0;
diff --git a/src/tools/export-report.ts b/src/tools/export-report.ts
new file mode 100644
index 0000000..c64e3d0
--- /dev/null
+++ b/src/tools/export-report.ts
@@ -0,0 +1,315 @@
+import { z } from "zod";
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { getTimeline, listIndexedProjects } from "../lib/timeline-db.js";
+import { getRelatedProjects } from "../lib/config.js";
+import type { SearchScope } from "../types.js";
+
+const RELATIVE_DATE_RE = /^(\d+)(days?|weeks?|months?|years?)$/;
+
+function parseRelativeDate(input: string): string {
+  const match = input.match(RELATIVE_DATE_RE);
+  if (!match) return input;
+  const [, numStr, unit] = match;
+  const num = parseInt(numStr, 10);
+  const d = new Date();
+  if (unit.startsWith("day")) d.setDate(d.getDate() - num);
+  else if (unit.startsWith("week")) d.setDate(d.getDate() - num * 7);
+  else if (unit.startsWith("month")) d.setMonth(d.getMonth() - num);
+  else if (unit.startsWith("year")) d.setFullYear(d.getFullYear() - num);
+  return d.toISOString();
+}
+
+async function getSearchProjects(scope: SearchScope): Promise<string[]> {
+  const currentProject = process.env.CLAUDE_PROJECT_DIR;
+  switch (scope) {
+    case "current":
+      return currentProject ? [currentProject] : [];
+    case "related": {
+      const related = getRelatedProjects();
+      return currentProject ? [currentProject, ...related] : related;
+    }
+    case "all": {
+      const projects = await listIndexedProjects();
+      return projects.map((p) => p.project);
+    }
+    default:
+      return currentProject ? [currentProject] : [];
+  }
+}
+
+interface EventRecord {
+  timestamp: string;
+  type: string;
+  content?: string;
+  summary?: string;
+  commit_hash?: string;
+  tool_name?: string;
+  metadata?: string;
+  session_id?: string;
+  project_name?: string;
+}
+
+interface DayStats {
+  prompts: number;
+  commits: number;
+  corrections: number;
+  toolCalls: number;
+  errors: number;
+  total: number;
+}
+
+function computeDayStats(events: EventRecord[]): DayStats {
+  const stats: DayStats = { prompts: 0, commits: 0, corrections: 0, toolCalls: 0, errors: 0, total: events.length };
+  for (const e of events) {
+    if (e.type === "prompt") stats.prompts++;
+    else if (e.type === "commit") stats.commits++;
+    else if (e.type === "correction") stats.corrections++;
+    else if (e.type === "tool_call") stats.toolCalls++;
+    else if (e.type === "error") stats.errors++;
+  }
+  return stats;
+}
+
+function renderSummarySection(allEvents: EventRecord[], days: Map<string, EventRecord[]>): string[] {
+  const lines: string[] = [];
+  const totalStats = computeDayStats(allEvents);
+  const sessions = new Set(allEvents.map((e) => e.session_id).filter(Boolean));
+
+  lines.push("## Summary");
+  lines.push("");
+  lines.push(`| Metric | Value |`);
+  lines.push(`|--------|-------|`);
+  lines.push(`| Total events | ${totalStats.total} |`);
+  lines.push(`| Days active | ${days.size} |`);
+  lines.push(`| Sessions | ${sessions.size} |`);
+  lines.push(`| Prompts | ${totalStats.prompts} |`);
+  lines.push(`| Commits | ${totalStats.commits} |`);
+  lines.push(`| Tool calls | ${totalStats.toolCalls} |`);
+  lines.push(`| Corrections | ${totalStats.corrections} |`);
+  lines.push(`| Errors | ${totalStats.errors} |`);
+  if (totalStats.prompts > 0) {
+    const correctionRate = ((totalStats.corrections / totalStats.prompts) * 100).toFixed(1);
+    lines.push(`| Correction rate | ${correctionRate}% |`);
+  }
+  lines.push("");
+
+  return lines;
+}
+
+function renderDailyBreakdown(days: Map<string, EventRecord[]>): string[] {
+  const lines: string[] = [];
+  const sortedDays = [...days.keys()].sort().reverse();
+
+  lines.push("## Daily Breakdown");
+  lines.push("");
+  lines.push("| Date | Events | Prompts | Commits | Corrections | Errors |");
+  lines.push("|------|--------|---------|---------|-------------|--------|");
+
+  for (const day of sortedDays) {
+    const stats = computeDayStats(days.get(day)!);
+    lines.push(
+      `| ${day} | ${stats.total} | ${stats.prompts} | ${stats.commits} | ${stats.corrections} | ${stats.errors} |`
+    );
+  }
+  lines.push("");
+
+  return lines;
+}
+
+function renderTrends(days: Map<string, EventRecord[]>): string[] {
+  const lines: string[] = [];
+  const sortedDays = [...days.keys()].sort();
+
+  if (sortedDays.length < 2) return lines;
+
+  lines.push("## Trends");
+  lines.push("");
+
+  // Prompt quality trend (correction rate over time)
+  const recentDays = sortedDays.slice(-7);
+  const olderDays = sortedDays.slice(0, -7);
+
+  if (olderDays.length > 0) {
+    const recentEvents = recentDays.flatMap((d) => days.get(d) || []);
+    const olderEvents = olderDays.flatMap((d) => days.get(d) || []);
+
+    const recentPrompts = recentEvents.filter((e) => e.type === "prompt").length;
+    const recentCorrections = recentEvents.filter((e) => e.type === "correction").length;
+    const olderPrompts = olderEvents.filter((e) => e.type === "prompt").length;
+    const olderCorrections = olderEvents.filter((e) => e.type === "correction").length;
+
+    const recentRate = recentPrompts > 0 ? (recentCorrections / recentPrompts) * 100 : 0;
+    const olderRate = olderPrompts > 0 ? (olderCorrections / olderPrompts) * 100 : 0;
+
+    lines.push(`- **Correction rate (last 7 days):** ${recentRate.toFixed(1)}%`);
+    lines.push(`- **Correction rate (prior):** ${olderRate.toFixed(1)}%`);
+
+    if (recentRate < olderRate) {
+      lines.push(`- 📈 Prompt quality is **improving** (fewer corrections needed)`);
+    } else if (recentRate > olderRate) {
+      lines.push(`- 📉 Prompt quality is **declining** (more corrections needed)`);
+    } else {
+      lines.push(`- ➡️ Prompt quality is **stable**`);
+    }
+  }
+
+  // Activity trend
+  const avgEventsPerDay = sortedDays.reduce((sum, d) => sum + (days.get(d)?.length || 0), 0) / sortedDays.length;
+  lines.push(`- **Average events/day:** ${avgEventsPerDay.toFixed(1)}`);
+  lines.push("");
+
+  return lines;
+}
+
+function renderCommitLog(events: EventRecord[]): string[] {
+  const commits = events.filter((e) => e.type === "commit");
+  if (commits.length === 0) return [];
+
+  const lines: string[] = [];
+  lines.push("## Commit Log");
+  lines.push("");
+
+  for (const c of commits) {
+    const hash = c.commit_hash ? c.commit_hash.slice(0, 7) : "???????";
+    const msg = (c.content || c.summary || "").slice(0, 120).replace(/\n/g, " ");
+    const time = c.timestamp ? new Date(c.timestamp).toISOString().slice(0, 16).replace("T", " ") : "unknown";
+    lines.push(`- \`${hash}\` ${msg} _(${time})_`);
+  }
+  lines.push("");
+
+  return lines;
+}
+
+function renderCorrections(events: EventRecord[]): string[] {
+  const corrections = events.filter((e) => e.type === "correction");
+  if (corrections.length === 0) return [];
+
+  const lines: string[] = [];
+  lines.push("## Corrections");
+  lines.push("");
+
+  for (const c of corrections) {
+    const msg = (c.content || c.summary || "").slice(0, 200).replace(/\n/g, " ");
+    const time = c.timestamp ? new Date(c.timestamp).toISOString().slice(0, 16).replace("T", " ") : "unknown";
+    lines.push(`- _(${time})_ ${msg}`);
+  }
+  lines.push("");
+
+  return lines;
+}
+
+export function registerExportReport(server: McpServer) {
+  server.tool(
+    "export_report",
+    "Generate a markdown report from timeline data. Includes summary statistics, daily breakdown, prompt quality trends, commit log, and corrections. Useful for weekly reviews and team standups.",
+    {
+      scope: z
+        .enum(["current", "related", "all"])
+        .default("current")
+        .describe("Search scope: current project, related projects, or all indexed"),
+      project: z.string().optional().describe("Filter to a specific project (overrides scope)"),
+      since: z
+        .string()
+        .optional()
+        .describe('Start date (ISO or relative like "7days", "1week", "1month")'),
+      until: z.string().optional().describe("End date (ISO or relative)"),
+      sections: z
+        .array(z.enum(["summary", "daily", "trends", "commits", "corrections"]))
+        .default(["summary", "daily", "trends", "commits", "corrections"])
+        .describe("Which sections to include"),
+      title: z.string().optional().describe("Custom report title"),
+    },
+    async (params) => {
+      const since = params.since ? parseRelativeDate(params.since) : undefined;
+      const until = params.until ? parseRelativeDate(params.until) : undefined;
+
+      let projectDirs: string[];
+      if (params.project) {
+        projectDirs = [params.project];
+      } else {
+        projectDirs = await getSearchProjects(params.scope);
+      }
+
+      if (projectDirs.length === 0) {
+        return {
+          content: [
+            {
+              type: "text" as const,
+              text: `# Report\n\n_No projects found for scope "${params.scope}". Make sure CLAUDE_PROJECT_DIR is set or projects are onboarded._`,
+            },
+          ],
+        };
+      }
+
+      // Fetch all events (high limit for reports)
+      const events: EventRecord[] = await getTimeline({
+        project_dirs: projectDirs,
+        project: undefined,
+        since,
+        until,
+        limit: 5000,
+        offset: 0,
+      });
+
+      if (events.length === 0) {
+        return {
+          content: [
+            {
+              type: "text" as const,
+              text: "# Report\n\n_No events found for the given filters._",
+            },
+          ],
+        };
+      }
+
+      // Group by day
+      const days = new Map<string, EventRecord[]>();
+      for (const event of events) {
+        const day = event.timestamp
+          ? new Date(event.timestamp).toISOString().slice(0, 10)
+          : "unknown";
+        if (!days.has(day)) days.set(day, []);
+        days.get(day)!.push(event);
+      }
+
+      // Build report
+      const sortedDays = [...days.keys()].sort();
+      const dateRange =
+        sortedDays.length > 1
+          ? `${sortedDays[0]} → ${sortedDays[sortedDays.length - 1]}`
+          : sortedDays[0];
+
+      const proj = params.project || params.scope;
+      const title = params.title || `Session Report: ${proj}`;
+
+      const lines: string[] = [
+        `# ${title}`,
+        "",
+        `_${dateRange} · ${events.length} events · Generated ${new Date().toISOString().slice(0, 16)}_`,
+        "",
+      ];
+
+      const sectionRenderers: Record<string, () => string[]> = {
+        summary: () => renderSummarySection(events, days),
+        daily: () => renderDailyBreakdown(days),
+        trends: () => renderTrends(days),
+        commits: () => renderCommitLog(events),
+        corrections: () => renderCorrections(events),
+      };
+
+      for (const section of params.sections) {
+        const renderer = sectionRenderers[section];
+        if (renderer) {
+          lines.push(...renderer());
+        }
+      }
+
+      lines.push("---");
+      lines.push("_Generated by preflight `export_report`_");
+
+      return {
+        content: [{ type: "text" as const, text: lines.join("\n") }],
+      };
+    }
+  );
+}