diff --git a/packages/opencode/src/cli/cmd/session.ts b/packages/opencode/src/cli/cmd/session.ts
index c6a1fd4138f..a9667969804 100644
--- a/packages/opencode/src/cli/cmd/session.ts
+++ b/packages/opencode/src/cli/cmd/session.ts
@@ -7,6 +7,9 @@ import { Locale } from "../../util/locale"
 import { Flag } from "../../flag/flag"
 import { EOL } from "os"
 import path from "path"
+import { Storage } from "../../storage/storage"
+import { Global } from "../../global"
+import fs from "fs/promises"
 
 function pagerCmd(): string[] {
   const lessOptions = ["-R", "-S"]
@@ -38,7 +41,8 @@ function pagerCmd(): string[] {
 export const SessionCommand = cmd({
   command: "session",
   describe: "manage sessions",
-  builder: (yargs: Argv) => yargs.command(SessionListCommand).demandCommand(),
+  builder: (yargs: Argv) =>
+    yargs.command(SessionListCommand).command(SessionPruneCommand).demandCommand(),
   async handler() {},
 })
 
@@ -133,3 +137,304 @@ function formatSessionJSON(sessions: Session.Info[]): string {
   }))
   return JSON.stringify(jsonData, null, 2)
 }
+
+function parseDuration(duration: string): number {
+  const match = duration.match(/^(\d+)([dhwm])$/)
+  if (!match) throw new Error(`Invalid duration format: ${duration}. Use format like 1d, 7d, 2w, 1m`)
+
+  const value = parseInt(match[1], 10)
+  const unit = match[2]
+
+  const ms = {
+    d: 24 * 60 * 60 * 1000,
+    h: 60 * 60 * 1000,
+    w: 7 * 24 * 60 * 60 * 1000,
+    m: 30 * 24 * 60 * 60 * 1000,
+  }[unit]!
+
+  return value * ms
+}
+
+function formatBytes(bytes: number): string {
+  if (bytes < 1024) return bytes + " B"
+  if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + " KB"
+  if (bytes < 1024 * 1024 * 1024) return (bytes / 1024 / 1024).toFixed(1) + " MB"
+  return (bytes / 1024 / 1024 / 1024).toFixed(1) + " GB"
+}
+
+async function getDirectorySize(dir: string): Promise<number> {
+  try {
+    let size = 0
+    for await (const file of new Bun.Glob("**/*").scan({ cwd: dir, absolute: true, onlyFiles: true })) {
+      try {
+        const stat = await fs.stat(file)
+        size += stat.size
+      } catch {}
+    }
+    return size
+  } catch {
+    return 0
+  }
+}
+
+export const SessionPruneCommand = cmd({
+  command: "prune <duration>",
+  describe: "delete sessions older than the specified duration",
+  builder: (yargs: Argv) => {
+    return yargs
+      .positional("duration", {
+        describe: "duration (e.g., 1d, 7d, 2w, 1m for days/hours/weeks/months)",
+        type: "string",
+        demandOption: true,
+      })
+      .option("dry-run", {
+        describe: "show what would be deleted without deleting",
+        type: "boolean",
+        default: false,
+      })
+      .option("force", {
+        alias: "f",
+        describe: "skip confirmation prompt",
+        type: "boolean",
+        default: false,
+      })
+      .option("all", {
+        alias: "a",
+        describe: "prune sessions from all projects (not just current)",
+        type: "boolean",
+        default: false,
+      })
+      .option("logs", {
+        describe: "also prune old log files",
+        type: "boolean",
+        default: false,
+      })
+      .option("snapshots", {
+        describe: "also prune orphaned snapshots",
+        type: "boolean",
+        default: false,
+      })
+  },
+  handler: async (args) => {
+    const duration = parseDuration(args.duration as string)
+    const cutoff = Date.now() - duration
+    const dryRun = args.dryRun as boolean
+    const force = args.force as boolean
+    const pruneAll = args.all as boolean
+    const pruneLogs = args.logs as boolean
+    const pruneSnapshots = args.snapshots as boolean
+
+    await bootstrap(process.cwd(), async () => {
+      const sessionsToDelete: Array<{ session: Session.Info; project: string }> = []
+      let totalSize = 0
+
+      // Get all projects
+      const storageDir = path.join(Global.Path.data, "storage")
+      const sessionDir = path.join(storageDir, "session")
+
+      let projects: string[] = []
+      try {
+        projects = await fs.readdir(sessionDir)
+      } catch {
+        console.log("No sessions found")
+        return
+      }
+
+      // Collect sessions to delete
+      for (const projectID of projects) {
+        const projectSessionDir = path.join(sessionDir, projectID)
+        try {
+          const files = await fs.readdir(projectSessionDir)
+          for (const file of files) {
+            if (!file.endsWith(".json")) continue
+            try {
+              const sessionPath = path.join(projectSessionDir, file)
+              const session = (await Bun.file(sessionPath).json()) as Session.Info
+
+              if (session.time.updated < cutoff) {
+                sessionsToDelete.push({ session, project: projectID })
+
+                // Estimate size: session file + messages + parts
+                const sessionSize = (await fs.stat(sessionPath)).size
+                const msgDir = path.join(storageDir, "message", session.id)
+                const msgSize = await getDirectorySize(msgDir)
+                totalSize += sessionSize + msgSize
+
+                // Add parts size
+                try {
+                  const msgFiles = await fs.readdir(msgDir)
+                  for (const msgFile of msgFiles) {
+                    const msgId = msgFile.replace(".json", "")
+                    const partDir = path.join(storageDir, "part", msgId)
+                    totalSize += await getDirectorySize(partDir)
+                  }
+                } catch {}
+              }
+            } catch {}
+          }
+        } catch {}
+      }
+
+      if (sessionsToDelete.length === 0) {
+        console.log(`No sessions older than ${args.duration} found`)
+        return
+      }
+
+      // Show summary
+      console.log(`${EOL}Sessions to ${dryRun ? "prune (dry run)" : "prune"}:`)
+      console.log("─".repeat(80))
+
+      for (const { session } of sessionsToDelete) {
+        const age = Math.floor((Date.now() - session.time.updated) / (24 * 60 * 60 * 1000))
+        const title = Locale.truncate(session.title, 40)
+        console.log(`  ${session.id}  ${title.padEnd(42)}  ${age}d ago`)
+      }
+
+      console.log("─".repeat(80))
+      console.log(`Total: ${sessionsToDelete.length} sessions, ~${formatBytes(totalSize)} estimated`)
+
+      // Handle logs
+      let logFiles: string[] = []
+      let logSize = 0
+      if (pruneLogs) {
+        const logDir = path.join(Global.Path.data, "log")
+        try {
+          const files = await fs.readdir(logDir)
+          for (const file of files) {
+            const filePath = path.join(logDir, file)
+            const stat = await fs.stat(filePath)
+            if (stat.mtime.getTime() < cutoff) {
+              logFiles.push(filePath)
+              logSize += stat.size
+            }
+          }
+          if (logFiles.length > 0) {
+            console.log(`${EOL}Log files to prune: ${logFiles.length} files, ~${formatBytes(logSize)}`)
+          }
+        } catch {}
+      }
+
+      // Handle snapshots
+      let snapshotDirs: string[] = []
+      let snapshotSize = 0
+      if (pruneSnapshots) {
+        const snapshotDir = path.join(Global.Path.data, "snapshot")
+        const activeSessionIds = new Set<string>()
+
+        // Get all active session IDs
+        for (const projectID of projects) {
+          try {
+            const files = await fs.readdir(path.join(sessionDir, projectID))
+            for (const file of files) {
+              if (file.endsWith(".json")) {
+                activeSessionIds.add(file.replace(".json", ""))
+              }
+            }
+          } catch {}
+        }
+
+        // Find orphaned snapshots
+        try {
+          const snapshots = await fs.readdir(snapshotDir)
+          for (const snapshot of snapshots) {
+            if (!activeSessionIds.has(snapshot)) {
+              const snapPath = path.join(snapshotDir, snapshot)
+              snapshotDirs.push(snapPath)
+              snapshotSize += await getDirectorySize(snapPath)
+            }
+          }
+          if (snapshotDirs.length > 0) {
+            console.log(`${EOL}Orphaned snapshots to prune: ${snapshotDirs.length} dirs, ~${formatBytes(snapshotSize)}`)
+          }
+        } catch {}
+      }
+
+      const grandTotal = totalSize + logSize + snapshotSize
+      console.log(`${EOL}Total space to free: ~${formatBytes(grandTotal)}`)
+
+      if (dryRun) {
+        console.log(`${EOL}Dry run - no changes made. Remove --dry-run to delete.`)
+        return
+      }
+
+      // Confirm
+      if (!force && process.stdin.isTTY) {
+        process.stdout.write(`${EOL}Proceed with deletion? [y/N] `)
+        const reader = process.stdin
+        const response = await new Promise<string>((resolve) => {
+          let data = ""
+          const onData = (chunk: Buffer) => {
+            data += chunk.toString()
+            if (data.includes("\n")) {
+              reader.removeListener("data", onData)
+              resolve(data.trim().toLowerCase())
+            }
+          }
+          reader.on("data", onData)
+          reader.resume()
+        })
+
+        if (response !== "y" && response !== "yes") {
+          console.log("Aborted")
+          return
+        }
+      }
+
+      // Delete sessions
+      console.log(`${EOL}Deleting sessions...`)
+      let deleted = 0
+      for (const { session, project } of sessionsToDelete) {
+        try {
+          // Delete session file
+          await fs.unlink(path.join(sessionDir, project, session.id + ".json")).catch(() => {})
+
+          // Delete messages
+          const msgDir = path.join(storageDir, "message", session.id)
+          try {
+            const msgFiles = await fs.readdir(msgDir)
+            for (const msgFile of msgFiles) {
+              const msgId = msgFile.replace(".json", "")
+              // Delete parts for this message
+              await fs.rm(path.join(storageDir, "part", msgId), { recursive: true, force: true }).catch(() => {})
+            }
+            await fs.rm(msgDir, { recursive: true, force: true })
+          } catch {}
+
+          // Delete session diff
+          await fs.unlink(path.join(storageDir, "session_diff", session.id + ".json")).catch(() => {})
+
+          // Delete todos
+          await fs.unlink(path.join(storageDir, "todo", session.id + ".json")).catch(() => {})
+
+          deleted++
+          if (deleted % 10 === 0) {
+            process.stdout.write(`  Deleted ${deleted}/${sessionsToDelete.length} sessions\r`)
+          }
+        } catch (e) {
+          console.error(`  Failed to delete session ${session.id}:`, e)
+        }
+      }
+      console.log(`  Deleted ${deleted}/${sessionsToDelete.length} sessions`)
+
+      // Delete logs
+      if (pruneLogs && logFiles.length > 0) {
+        console.log(`Deleting log files...`)
+        for (const file of logFiles) {
+          await fs.unlink(file).catch(() => {})
+        }
+        console.log(`  Deleted ${logFiles.length} log files`)
+      }
+
+      // Delete snapshots
+      if (pruneSnapshots && snapshotDirs.length > 0) {
+        console.log(`Deleting orphaned snapshots...`)
+        for (const dir of snapshotDirs) {
+          await fs.rm(dir, { recursive: true, force: true }).catch(() => {})
+        }
+        console.log(`  Deleted ${snapshotDirs.length} snapshot directories`)
+      }
+
+      console.log(`${EOL}Done! Freed approximately ${formatBytes(grandTotal)}`)
+    })
+  },
+})