diff --git a/profiles/agent-opencode.yaml b/profiles/agent-opencode.yaml
index 797121f..ffd96d4 100644
--- a/profiles/agent-opencode.yaml
+++ b/profiles/agent-opencode.yaml
@@ -1,8 +1,12 @@
 # OpenCode agent configuration.
 #
+# OpenCode uses ANTHROPIC_BASE_URL with inference.local/v1 (note the /v1 suffix).
+# Without /v1, OpenCode sends POST /messages instead of POST /v1/messages,
+# which doesn't match the inference route pattern.
+# See: https://github.com/NVIDIA/OpenShell/blob/main/docs/providers/google-vertex-ai.mdx
+#
 # Usage:
-#   harness up -f agents/opencode.yaml
-#   harness up --agent opencode
+#   harness apply --agent opencode
 
 name: opencode-agent
 entrypoint: opencode
@@ -17,6 +21,7 @@ providers:
       JIRA_USERNAME: ${JIRA_USERNAME}
   - profile: gws
 
+# OpenCode needs /v1 suffix on ANTHROPIC_BASE_URL (different from Claude Code).
 env:
-  OPENAI_BASE_URL: https://inference.local/v1
-  OPENAI_API_KEY: sk-ant-openshell-proxy-managed
+  ANTHROPIC_BASE_URL: https://inference.local/v1
+  ANTHROPIC_API_KEY: sk-ant-openshell-proxy-managed
diff --git a/profiles/images/sandbox-default/opencode.json b/profiles/images/sandbox-default/opencode.json
index 8a8d30e..7e32ede 100644
--- a/profiles/images/sandbox-default/opencode.json
+++ b/profiles/images/sandbox-default/opencode.json
@@ -1,11 +1,11 @@
 {
+  "$schema": "https://opencode.ai/config.json",
   "mcp": {
     "atlassian": {
       "type": "local",
-      "command": "/sandbox/.venv/bin/mcp-atlassian",
-      "args": [],
+      "command": ["/sandbox/.venv/bin/mcp-atlassian"],
       "enabled": true,
-      "env": {
+      "environment": {
         "READ_ONLY_MODE": "true"
       }
     }
diff --git a/test/configs/agent-opencode-vertex.yaml b/test/configs/agent-opencode-vertex.yaml
index de88f6d..06c9908 100644
--- a/test/configs/agent-opencode-vertex.yaml
+++ b/test/configs/agent-opencode-vertex.yaml
@@ -1,11 +1,10 @@
-# OpenCode with Vertex AI via inference.local proxy.
-# OpenCode uses OpenAI-compatible API at inference.local/v1.
-# The proxy translates to Vertex AI Anthropic models.
+# OpenCode with Vertex AI via inference.local/v1.
+# OpenCode uses ANTHROPIC_BASE_URL (not OPENAI_BASE_URL) with /v1 suffix.
 # Requires: gcloud auth application-default login, ANTHROPIC_VERTEX_PROJECT_ID.
 name: test-opencode
 entrypoint: opencode
 providers:
   - profile: vertex-local
 env:
-  OPENAI_BASE_URL: https://inference.local/v1
-  OPENAI_API_KEY: sk-ant-openshell-proxy-managed
+  ANTHROPIC_BASE_URL: https://inference.local/v1
+  ANTHROPIC_API_KEY: sk-ant-openshell-proxy-managed
diff --git a/test/suite/run.sh b/test/suite/run.sh
index 2c5cbfa..655f291 100755
--- a/test/suite/run.sh
+++ b/test/suite/run.sh
@@ -305,7 +305,7 @@ if $LIVE && "$CLI" inference get >/dev/null 2>&1; then
         "$CLI" sandbox exec --name test-agent-int -- \
           bash -c 'result=$(echo "respond with ok" | claude --print 2>&1); test -n "$result"'
 
-      # OpenCode uses inference.local/v1 (OpenAI-compatible) via the proxy.
+      # OpenCode uses ANTHROPIC_BASE_URL=inference.local/v1 (note /v1 suffix)
       SANDBOXES_TO_CLEAN+=(test-opencode-int)
       run_test "agent: opencode inference via vertex" \
         bash -c '"$1" apply -f "$2" --name test-opencode-int >/dev/null 2>&1 && \
@@ -340,16 +340,15 @@ if $LIVE && "$CLI" inference get >/dev/null 2>&1; then
       fi
     else
       skip_test "agent: claude inference via vertex" "sandbox not ready"
-      skip_test "agent: opencode inference via vertex" "sandbox not ready"
       skip_test "agent: github via gh cli" "sandbox not ready"
       skip_test "agent: claude uses jira mcp" "sandbox not ready"
       skip_test "agent: gws gmail via proxy token" "sandbox not ready"
-      skip_test "agent: opencode built-in profile" "sandbox not ready"
     fi
 
     # Test the built-in opencode profile (--agent opencode) with all providers.
     # Verifies the shipped profile works end-to-end with Vertex via inference.local/v1.
     SANDBOXES_TO_CLEAN+=(test-oc-builtin)
+    SANDBOXES_TO_CLEAN+=(test-oc-builtin)
     run_test "agent: opencode built-in profile" \
       bash -c '"$1" apply --agent opencode --name test-oc-builtin >/dev/null 2>&1 && \
         for i in $(seq 1 10); do "$1" describe test-oc-builtin >/dev/null 2>&1 && break; sleep 0.5; done && \
@@ -360,11 +359,9 @@ if $LIVE && "$CLI" inference get >/dev/null 2>&1; then
     "$HARNESS" delete --sandboxes --providers >/dev/null 2>&1 || true
   else
     skip_test "agent: claude inference via vertex" "ANTHROPIC_VERTEX_PROJECT_ID not set"
-    skip_test "agent: opencode inference via vertex" "ANTHROPIC_VERTEX_PROJECT_ID not set"
     skip_test "agent: github via gh cli" "ANTHROPIC_VERTEX_PROJECT_ID not set"
     skip_test "agent: claude uses jira mcp" "ANTHROPIC_VERTEX_PROJECT_ID not set"
     skip_test "agent: gws gmail via proxy token" "ANTHROPIC_VERTEX_PROJECT_ID not set"
-    skip_test "agent: opencode built-in profile" "ANTHROPIC_VERTEX_PROJECT_ID not set"
   fi
 
   echo ""