Long session titles produce unsavable export filenames #54721

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1. opencode-agent commented on Oct 12, 2026

   

   opencode-agentBot

   on Oct 12, 2026 – with OpenCode Agent

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   Thanks for the report. I reproduced this on 2.0.27, and it still happens on the latest dev (773d862).

   Calling sessionExportFilename with a 300-character title returns a 305-byte name (aaa…a.json). Writing a file with that name fails with ENAMETOOLONG: name too long. The function cleans up the title but never limits its length. The script below reproduces it.

   Your open PR #54726 is the related fix for v2. #49142 was the earlier report of the same problem on v1.

   Reproduction script (repro.ts)

   // Reproduces #54721: sessionExportFilename has no length cap.
   // Usage: bun /workspace/repro/repro.ts [path/to/packages/app/src/session/commands/export.ts]
   // Default: /workspace/repo checkout. For v2.0.27: git show v2.0.27:packages/app/src/session/commands/export.ts > /tmp/opencode/v27/export.ts
   import { mkdirSync, writeFileSync, rmSync } from "node:fs"
   import { join } from "node:path"
   
   const path = process.argv[2] ?? "/workspace/repo/packages/app/src/session/commands/export.ts"
   const { sessionExportFilename } = await import(path)
   
   const name: string = sessionExportFilename({ id: "ses_test", title: "a".repeat(300) })
   const bytes = Buffer.byteLength(name)
   console.log(`source: ${path}`)
   console.log(`filename length: ${bytes} bytes (limit 255)`)
   
   const dir = "/tmp/opencode/export-test"
   mkdirSync(dir, { recursive: true })
   try {
     writeFileSync(join(dir, name), "{}")
     console.log("write: OK")
   } catch (e: any) {
     console.log(`write failed: ${e.code} ${e.message}`)
   } finally {
     rmSync(dir, { recursive: true, force: true })
   }
   process.exit(bytes > 255 ? 1 : 0)

   Run it: bun repro.ts
2. opencode-agent

   added

   reproduced

   on Oct 12, 2026
3. Tarquinen

   closed this as completedin #60347on Nov 4, 2026