v2: add optimistic UI while MCP prompt commands resolve #34860

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1. opencode-agent

   added

   2.0

   tui

   enhancementNew feature or requestNew feature or request

   on Jul 5, 2026
2. zanemo109 commented on Aug 2, 2026

   

   zanemo109

   on Aug 2, 2026

   More actions

   I’d like to take this on. I’ve traced the current TUI submission path and plan to add a small pending/resolving state that appears immediately after an MCP-backed slash command is submitted, clears when resolution completes or fails, and is covered by a delayed-resolution regression test. Does that interaction and scope match what you had in mind?
3. opencodejr commented on Oct 29, 2026

   

   opencodejrBot

   on Oct 29, 2026

   Contributor

   More actions

   Thanks for the detailed report. I reproduced this on v2.2.0 and on the latest dev (f43563b).

   Setup: a small local stdio MCP server, slow, offering one prompt, greet. It waits 4 seconds before answering a prompt request, which stands in for the artificial delay in the issue.

   Steps: submit /slow:greet world in the TUI.

   Result: the TUI switches to a blank "New session" view with an empty composer for the whole 4 seconds. There's no user row and no busy or interrupt indicator. Then the resolved prompt ("Say hello to world") appears and the model replies. The recording and screenshots below show this, and the script below reproduces it with opencode-drive.

   Likely cause: in packages/tui/src/component/prompt/index.tsx, the slash-command branch of submit sends session.command without calling move.startSubmit() and without the optimistic admission that plain prompts get via data.session.prompt. So nothing is rendered until the server has resolved the MCP prompt and admitted the result.

   

   

   Reproduction script (drive.ts)

   // Repro for #34860: no pending UI while an MCP prompt slash command resolves.
   // A local stdio MCP server (slow-mcp.mjs, next to this script) delays prompts/get by 4s.
   import { Effect, Stream } from "effect"
   import { Llm, OpenCodeDriver } from "opencode-drive"
   
   const server = `
   import { createInterface } from "node:readline"
   const send = (m) => process.stdout.write(JSON.stringify(m) + "\\n")
   createInterface({ input: process.stdin }).on("line", (line) => {
     if (!line.trim()) return
     const msg = JSON.parse(line)
     if (msg.id === undefined) return
     const ok = (result) => send({ jsonrpc: "2.0", id: msg.id, result })
     if (msg.method === "initialize") return ok({ protocolVersion: msg.params?.protocolVersion ?? "2025-06-18", capabilities: { prompts: {} }, serverInfo: { name: "slow", version: "1.0.0" } })
     if (msg.method === "prompts/list") return ok({ prompts: [{ name: "greet", description: "Slow greeting prompt", arguments: [{ name: "who", required: true }] }] })
     if (msg.method === "prompts/get") return setTimeout(() => ok({ messages: [{ role: "user", content: { type: "text", text: "Say hello to " + msg.params?.arguments?.who } }] }), 4000)
     send({ jsonrpc: "2.0", id: msg.id, error: { code: -32601, message: "Method not found" } })
   })
   `
   
   export default OpenCodeDriver.use(
     {
       ...(process.env.OC_DEV ? { opencode: { dev: process.env.OC_DEV } } : {}),
       tui: { recording: true, keypressOverlay: true },
       project: { git: true, files: { "slow-mcp.mjs": server } },
       config: { mcp: { servers: { slow: { type: "local", command: ["bun", "slow-mcp.mjs"] } } } } as any,
     },
     ({ ui, llm }) =>
       Effect.gen(function* () {
         yield* llm.serve(() => Stream.make(Llm.text("Hello, world!")))
         yield* Effect.sleep(3000) // let the MCP server connect
         yield* ui.type("/slow:greet world")
         yield* Effect.sleep(500)
         yield* ui.screenshot("01-typed")
         yield* ui.enter()
         yield* Effect.sleep(300)
         yield* ui.screenshot("02-after-submit-300ms")
         yield* Effect.sleep(1500)
         yield* ui.screenshot("03-after-submit-1800ms")
         yield* Effect.sleep(1500)
         yield* ui.screenshot("04-after-submit-3300ms")
         yield* ui.waitFor("Say hello to world")
         yield* ui.waitFor("Hello, world!")
         yield* ui.screenshot("05-resolved")
       }),
   )

   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.
4. opencodejr

   added

   reproduced

   on Oct 29, 2026