core: agent silently stays in old directory when session_move fails ("Unable to move session to <dir>") #56038

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1. opencode-agent commented on Oct 16, 2026

   

   opencode-agentBot

   on Oct 16, 2026 – with OpenCode Agent

   Contributor

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   Thanks for the detailed report. I reproduced this on 2.0.30 and it still happens on the latest dev (00e7472).

   Steps: with a simulated model, the model calls execute with code that runs await tools.opencode.session_move({ directory: "/tmp/does-not-exist-56038" }) inside a try/catch and returns the caught error. The tool result the model gets back is:

   {"name":"Error","message":"Unable to move session to /tmp/does-not-exist-56038","cause":null}
   

   Nothing in it says the directory doesn't exist. The session.move HTTP handler maps the same errors to specific messages (Directory does not exist: …, Not a directory: …, and so on), but the tool in packages/core/src/tool/plugin/opencode.ts still turns every error into one message. The hint and tool description also still don't say the directory has to exist before the call.

   The script below reproduces it, and the recording shows the failed opencode.session_move call in the TUI.

   recording.mp4

   Reproduction script (drive.ts)

   // Repro for anomalyco/opencode#56038: session_move to a missing directory
   // returns only "Unable to move session to <dir>" with no reason.
   import { Effect, Stream } from "effect"
   import { Llm, OpenCodeDriver } from "opencode-drive"
   
   const code = `try {
     await tools.opencode.session_move({ directory: "/tmp/does-not-exist-56038" })
     return "moved"
   } catch (e) {
     return JSON.stringify({ name: e?.name, message: e?.message, cause: e?.cause ? String(e.cause) : null })
   }`
   
   export default OpenCodeDriver.use(
     {
       ...(process.env.OC_DEV ? { opencode: { dev: process.env.OC_DEV } } : {}),
       project: { git: true, files: { "README.md": "hi\n" } },
       tui: { recording: true },
     },
     ({ ui, llm }) =>
       Effect.gen(function* () {
         yield* llm.serve((request, index) => {
           if (index === 0)
             return Stream.make(
               Llm.toolCall({ index: 0, id: "call_move", name: "execute", input: { code } }),
               Llm.finish("tool-calls"),
             )
           // Print the tool result the model receives for the execute call.
           const body = JSON.stringify(request)
           const at = body.indexOf("Unable to move")
           console.log("TOOL RESULT SEEN BY MODEL:", at >= 0 ? body.slice(Math.max(0, at - 300), at + 300) : body.slice(-1500))
           return Stream.make(Llm.text("Done checking the move result."))
         })
         yield* ui.submit("Move this session to /tmp/does-not-exist-56038")
         yield* ui.waitFor("Done checking", { timeout: 60000 })
         yield* Effect.sleep(1500)
         yield* ui.screenshot("session-move-error")
       }),
   )

   Run it with opencode-drive: opencode-drive run ./drive.ts. It drives opencode from your PATH; set OC_DEV to the path of an OpenCode checkout to run that from source instead.
2. opencode-agent

   added

   reproduced

   on Oct 16, 2026