Open Responses parser rejects "namespace": null on function_call items ("Invalid … stream event") #55557

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1. opencode-agent commented on Oct 14, 2026

   

   opencode-agentBot

   on Oct 14, 2026 – with OpenCode Agent

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   Thanks for the detailed report and the minimal server. I reproduced this on 2.0.25, and it still happens on the latest dev (3943b84).

   What I did:

   • I ran a fake Responses server that streams one glob function_call item with "namespace": null, then replies with text once the tool result comes back.
   • I pointed a @opencode/ai/providers/openai provider at it and ran opencode run -m fake/m "list markdown files".
   • The first turn fails with Invalid fake/openai-responses stream event, the tool never runs, and the server log shows Failed to drain Session.
   • Without the field, the same stream works: the tool runs and the follow-up turn completes.
   • Decoding that single event with OpenResponses.protocol.stream.event on dev gives the same error as yours: Expected string | undefined at ["item"]["namespace"].

   The script below reproduces it. Run it as is for the released version, or with OC_DEV=<checkout> to run from source; NS=omit sends the stream without the field as a control.

   One small note on the steps: in v2 the config key is providers, not provider. With provider you get an unrelated "Unsupported package" error instead.

   Related Responses-compatibility issues, not duplicates: #50314 (data: null frames), #43732 (a gateway sending "truncation": ""), #55357 (replayed reasoning items sent without id).

   Reproduction script (repro.sh)

   #!/usr/bin/env bash
   # Repro for anomalyco/opencode#55557: Responses stream with function_call item "namespace": null.
   # Usage: ./repro.sh                 (uses `opencode` from PATH)
   #        OC_DEV=/path/to/checkout ./repro.sh   (runs from source)
   # Set NS=omit to send the same stream without the namespace field (control).
   set -u
   WORK=$(mktemp -d)
   PORT=${PORT:-4599}
   NS=${NS:-null}
   cat > "$WORK/fake.cjs" <<EOF
   let n = 0
   require("node:http").createServer((req, res) => {
     if (req.url === "/v1/models") return res.end(JSON.stringify({ data: [{ id: "m" }] }))
     let body = ""
     req.on("data", (c) => (body += c))
     req.on("end", () => {
       n++; console.error("[fake] request", n, body.includes("function_call_output") ? "(has tool output)" : "(no tool output)")
       res.writeHead(200, { "content-type": "text/event-stream" })
       let events
       if (!body.includes("function_call_output")) {
         const fc = { type: "function_call", id: "fc_1", call_id: "call_1", name: "glob", arguments: '{"pattern":"*.md"}' }
         if ("$NS" === "null") fc.namespace = null
         events = [
           { type: "response.created", response: { id: "r1", output: [] } },
           { type: "response.output_item.added", output_index: 0, item: { ...fc, arguments: "" } },
           { type: "response.function_call_arguments.done", item_id: "fc_1", output_index: 0, arguments: fc.arguments },
           { type: "response.output_item.done", output_index: 0, item: fc },
           { type: "response.completed", response: { id: "r1", output: [fc], usage: { input_tokens: 1, output_tokens: 1 } } },
         ]
       } else {
         const msg = { type: "message", id: "msg_1", role: "assistant", status: "completed", content: [{ type: "output_text", text: "DONE_AFTER_TOOL", annotations: [] }] }
         events = [
           { type: "response.created", response: { id: "r2", output: [] } },
           { type: "response.output_item.added", output_index: 0, item: { ...msg, status: "in_progress", content: [] } },
           { type: "response.output_text.delta", item_id: "msg_1", output_index: 0, content_index: 0, delta: "DONE_AFTER_TOOL" },
           { type: "response.output_item.done", output_index: 0, item: msg },
           { type: "response.completed", response: { id: "r2", output: [msg], usage: { input_tokens: 1, output_tokens: 1 } } },
         ]
       }
       for (const e of events) res.write("event: " + e.type + "\ndata: " + JSON.stringify(e) + "\n\n")
       res.end()
     })
   }).listen($PORT)
   EOF
   node "$WORK/fake.cjs" & SRV=$!
   trap 'kill $SRV 2>/dev/null; rm -rf "$WORK"' EXIT
   mkdir -p "$WORK/proj" && cd "$WORK/proj" && git init -q && echo hi > README.md
   mkdir -p "$WORK/config/opencode"; cat > "$WORK/config/opencode/opencode.json" <<EOF
   {
     "providers": {
       "fake": {
         "name": "Fake",
         "package": "@opencode/ai/providers/openai",
         "settings": { "baseURL": "http://127.0.0.1:$PORT/v1", "apiKey": "x" },
         "models": { "m": { "name": "m" } }
       }
     }
   }
   EOF
   export OPENCODE_PASSWORD=repro-pass XDG_DATA_HOME="$WORK/data" XDG_CONFIG_HOME="$WORK/config" XDG_STATE_HOME="$WORK/state" XDG_CACHE_HOME="$WORK/cache"
   sleep 1
   if [ -n "${OC_DEV:-}" ]; then
     OC=(bun --conditions=browser --preload="$OC_DEV/packages/tui/node_modules/@opentui/solid/scripts/preload.js" "$OC_DEV/packages/cli/src/index.ts")
   else
     OC=(opencode)
   fi
   echo "version: $("${OC[@]}" --version)  namespace=$NS"
   CONN=(--standalone)
   if [ -n "${OC_DEV:-}" ]; then
     # From source, the auto-spawned standalone server misses the preload, so start `serve` separately.
     "${OC[@]}" serve --stdio --port 0 < <(sleep 600) > "$WORK/serve.out" 2> "$WORK/serve.err" & SERVE=$!
     trap 'kill $SRV $SERVE 2>/dev/null; rm -rf "$WORK"' EXIT
     for i in $(seq 60); do grep -q url "$WORK/serve.out" 2>/dev/null && break; sleep 1; done
     URL=$(grep -o 'http://[^"]*' "$WORK/serve.out" | head -1)
     CONN=(--server "$URL")
     sleep 1
   fi
   timeout 90 "${OC[@]}" run "${CONN[@]}" --auto --print-logs -m fake/m "list markdown files" 2>&1 | grep -E "\[fake\]|namespace|Invalid|SchemaError|DONE_AFTER_TOOL|Error" | cut -c1-400 | head -20
   [ -n "${OC_DEV:-}" ] && grep -E "Invalid|SchemaError|namespace" "$WORK/serve.err" | cut -c1-400 | head -5

   Run it: bash repro.sh
2. opencode-agent

   added

   reproduced

   on Oct 14, 2026
3. kksingh000

   added a commit that references this issue on Oct 15, 2026

   fix(ai): accept null namespace on function_call items

   ...

   This issue will close once commit 5b1fe94 is merged into the 'dev' branch.

   5b1fe94
4. rekram1-node

   closed this as completedin #55631on Oct 15, 2026
5. rekram1-node commented on Oct 15, 2026

   

   rekram1-node

   on Oct 15, 2026

   Collaborator

   More actions

   merged a fix, will prolly loosen some more areas that are too strict
6. rekram1-node

   self-assigned this

   on Oct 15, 2026