diff --git a/agent-contract/index.md b/agent-contract/index.md
index 458f3d2..2f8d158 100644
--- a/agent-contract/index.md
+++ b/agent-contract/index.md
@@ -12,7 +12,7 @@
 
 | id | 읽는 조건 | path |
 |----|-----------|------|
-| `iop.openai-compatible-api` | OpenAI-compatible API, Responses API, Chat Completions, `model` route, Codex/CLI workspace, NomadCode authoring metadata, `metadata.workspace`, `metadata.task_id`, `metadata.source` | `agent-contract/provided/openai-compatible-api.md` |
+| `iop.openai-compatible-api` | OpenAI-compatible API, Responses API, Chat Completions, legacy Completions, `model` route, Codex/CLI workspace, generic authoring metadata, `metadata.workspace`, `metadata.task_id` | `agent-contract/provided/openai-compatible-api.md` |
 
 ## 소비 계약
 
diff --git a/agent-contract/provided/openai-compatible-api.md b/agent-contract/provided/openai-compatible-api.md
index fffa253..da3ba8f 100644
--- a/agent-contract/provided/openai-compatible-api.md
+++ b/agent-contract/provided/openai-compatible-api.md
@@ -44,52 +44,83 @@ CLI agent 실행으로 라우팅되는 요청의 최소 형태:
 }
 ```
 
+현재 `/v1/responses`에서 허용하는 표준형 요청 예시:
+
+```json
+{
+  "model": "codex",
+  "instructions": "응답은 짧게 작성해.",
+  "input": "현재 워크스페이스의 테스트 상태를 확인해줘.",
+  "stream": false,
+  "background": false,
+  "max_output_tokens": 4096,
+  "temperature": 0,
+  "top_p": 1,
+  "metadata": {
+    "workspace": "/config/workspace/iop",
+    "request_id": "req-001",
+    "task_id": "task-123"
+  }
+}
+```
+
 필드 의미:
 
-- `model`: Edge가 내부 `adapter + target`으로 해석할 외부 route 이름이다.
-- `input`: agent에게 전달할 사용자 요청이다.
+- `model`: Edge가 내부 `adapter + target`으로 해석할 외부 route 이름이다. IOP Edge에서는 라우팅을 위해 필수다.
+- `instructions`: OpenAI Responses API의 top-level instruction field다. 있으면 `input` 앞에 배치해 agent 실행 prompt를 만든다.
+- `input`: agent에게 전달할 사용자 요청이다. 현재 구현은 string input만 지원한다.
+- `stream`: 현재 구현은 `false` 또는 생략만 지원한다.
+- `background`: 현재 구현은 `false` 또는 생략만 지원한다.
 - `metadata.workspace`: CLI process를 실행할 작업 디렉터리다. CLI agent route에서는 필수 실행 문맥이다.
+- `metadata`: OpenAI 표준 metadata container다. string key/value를 허용하고, IOP는 `workspace`만 실행 문맥으로 해석한다. 나머지 key는 caller-defined metadata로 보존하되 `source`는 지원하지 않는다.
+- `metadata.request_id`, `metadata.task_id`: caller-defined metadata 예시다. 특별한 wrapper나 제품 전용 field가 아니다.
+- `max_output_tokens`: 출력 길이 상한이다. 내부 provider option의 `max_tokens`로 전달된다.
+- `temperature`: 생성 다양성 option이다. 대상 adapter가 지원하지 않으면 무시될 수 있다.
+- `top_p`: nucleus sampling option이다. 대상 adapter가 지원하지 않으면 무시될 수 있다.
 
 금지:
 
 - `metadata.cli` 같은 CLI 전용 wrapper를 추가하지 않는다.
+- `metadata.inference`처럼 `model` route와 겹치는 target wrapper를 추가하지 않는다.
+- `metadata.nomadcode`처럼 특정 소비자 제품명에 묶인 wrapper를 추가하지 않는다.
+- `metadata.source`처럼 의미가 불명확한 호출 출처 field를 추가하지 않는다.
 - root-level `iop` 같은 별도 wrapper field를 추가하지 않는다.
+- `/v1/responses`에 `options` wrapper를 추가하지 않는다. Responses API option은 OpenAI 표준 top-level field를 따른다.
+- `session_id`, `timeout_sec` 같은 IOP 실행 제어 field를 request body 계약에 추가하지 않는다. logical session과 timeout은 route/config 기본값을 따른다.
 - workspace를 prompt 본문에 섞어 전달하지 않는다.
 
 현재 구현 메모:
 
 - `/v1/responses`는 non-streaming 요청만 지원한다.
-- 기존 metadata 계약인 `metadata.request_id`, `metadata.nomadcode.task_id`, `metadata.nomadcode.source`, `metadata.inference.target`은 유지한다.
+- `metadata`는 최대 16개 string key/value를 허용한다. key는 64자 이하, value는 512자 이하를 기준으로 한다.
 - CLI route의 `metadata.workspace`는 이 문서의 계약 기준이다. 구현은 이 값을 Edge service의 run workspace와 Node CLI adapter의 process working directory로 전달해야 한다.
+- `metadata.workspace`는 `RunRequest.Workspace`로 전달하고 generic run metadata에는 복사하지 않는다.
+- 다른 Responses API 표준 field는 구현 필요가 생길 때 계약을 갱신한 뒤 추가한다.
 
-## NomadCode Authoring Handoff
+## Generic Authoring Handoff
 
-NomadCode Core가 IOP Edge HTTP 표면으로 workspace authoring 작업을 넘길 때의 최소 요청 형태:
+외부 caller가 IOP Edge HTTP 표면으로 workspace authoring 작업을 넘길 때의 최소 요청 형태:
 
 ```json
 {
   "model": "codex",
   "input": "Todo 항목에 필요한 산출물을 현재 checkout에 작성해줘.",
   "metadata": {
-    "workspace": "/config/workspace/nomadcode-slot-123",
-    "task_id": "todo-123",
-    "source": "nomadcode"
+    "workspace": "/config/workspace/work-slot-123",
+    "task_id": "todo-123"
   }
 }
 ```
 
-NomadCode task/source context는 flat `metadata.task_id`와 `metadata.source`로 전달할 수 있다.
-동일한 의미의 structured 형태가 필요하면 `metadata.nomadcode.task_id`와 `metadata.nomadcode.source`를 사용하며, flat alias와 structured 값이 함께 있으면 structured 값을 우선한다.
-
-이 handoff는 `model`, `input`, `metadata.workspace`, task/source metadata만으로 충분해야 한다.
-호출자는 `metadata.cli`, root-level `iop` wrapper, IOP CLI 직접 실행, prompt 본문 workspace 주입을 요구받지 않는다.
+이 handoff는 `model`, `input`, `metadata.workspace`, 필요한 caller-defined metadata만으로 충분해야 한다.
+호출자는 `metadata.cli`, 소비자 전용 metadata wrapper, root-level `iop` wrapper, IOP CLI 직접 실행, prompt 본문 workspace 주입을 요구받지 않는다.
 
 Workspace-bound route는 workspace가 없거나 상대 경로이면 OpenAI-compatible error로 거부한다.
 존재하지 않는 경로, 권한 오류, agent process exit failure는 기본 cwd fallback으로 숨기지 않고 호출자가 실패로 구분할 수 있어야 한다.
 
 ## Chat Completions
 
-`/v1/chat/completions`도 같은 metadata 원칙을 따른다. CLI route의 workspace는 `metadata.workspace`에 둔다.
+`/v1/chat/completions`도 같은 metadata 원칙을 따른다. CLI route의 workspace는 `metadata.workspace`에 둔다. Chat Completions의 provider sampling option은 해당 endpoint의 OpenAI-compatible top-level request field를 따르며, `/v1/responses`와 마찬가지로 별도 `options` wrapper를 두지 않는다.
 
 ```json
 {
@@ -106,6 +137,34 @@ Workspace-bound route는 workspace가 없거나 상대 경로이면 OpenAI-compa
 }
 ```
 
+현재 지원하는 Chat Completions request field:
+
+- `model`
+- `messages`
+- `stream`
+- `metadata`
+- `max_tokens`
+- `max_completion_tokens`
+- `temperature`
+- `top_p`
+- `presence_penalty`
+- `frequency_penalty`
+- `seed`
+- `stop`
+- `response_format`
+- `tools`
+
+금지:
+
+- `metadata.source`, `metadata.cli`, `metadata.inference`, `metadata.nomadcode`
+- `options`, `think`, `format`, `keep_alive` 같은 provider/Ollama 전용 request field
+- `session_id`, `timeout_sec` 같은 IOP 실행 제어 field
+
+## Legacy Completions
+
+`POST /v1/completions`는 현재 IOP Edge OpenAI-compatible 표면에서 제공하지 않는다.
+text completion 형태의 신규 호출은 `/v1/responses`를 사용하고, message 기반 호출은 `/v1/chat/completions`를 사용한다.
+
 ## Routing
 
 Edge 설정이 `openai.model_routes[]`를 제공하면 `model`은 먼저 route catalog에서 해석된다.
diff --git a/apps/edge/README.md b/apps/edge/README.md
index eb677c8..93ad5bb 100644
--- a/apps/edge/README.md
+++ b/apps/edge/README.md
@@ -193,7 +193,7 @@ Edge 외부 입력은 OpenAI-compatible HTTP API와 A2A JSON-RPC HTTP API 두 
 
 이 표면은 외부 모델 클라이언트 호환을 위한 표준 경로다. Edge/Node 운영 제어, CLI logical session, background run, cancel/terminate-session, capabilities/status/session/transport command, node lifecycle event 같은 IOP 고유 기능은 OpenAI-compatible 요청에 억지로 싣지 않고 IOP native protocol(protobuf-socket) 계열에서 다룬다.
 
-외부 프로젝트가 참조할 요청 계약 원문은 repo root의 `agent-contract/provided/openai-compatible-api.md`에 둔다. CLI agent route에서 사용할 workspace는 OpenAI request의 `metadata.workspace`에 둔다. NomadCode authoring handoff의 요청 shape도 같은 계약 원문을 기준으로 한다.
+외부 프로젝트가 참조할 요청 계약 원문은 repo root의 `agent-contract/provided/openai-compatible-api.md`에 둔다. CLI agent route에서 사용할 workspace는 OpenAI request의 `metadata.workspace`에 둔다. Workspace authoring handoff의 요청 shape도 같은 계약 원문을 기준으로 한다.
 
 ```yaml
 openai:
@@ -233,7 +233,7 @@ openai:
       target: "llama3:8b"
 ```
 
-`/v1/chat/completions`는 기본 non-streaming과 streaming SSE 응답을 모두 지원한다. `/v1/responses`는 현재 non-streaming 요청만 지원한다. 두 endpoint 모두 `metadata.workspace`를 run workspace로 전달하고, `metadata.request_id`, `metadata.inference.target`, `metadata.nomadcode.task_id`, `metadata.nomadcode.source`를 service boundary까지 전달한다. NomadCode compatibility alias로 root-level `metadata.task_id`와 `metadata.source`도 받아 각각 `nomadcode.task_id`, `nomadcode.source`로 매핑하며, structured `metadata.nomadcode.*` 값이 있으면 그 값을 우선한다. `metadata.cli`는 지원하지 않는다.
+`/v1/chat/completions`는 기본 non-streaming과 streaming SSE 응답을 모두 지원한다. `/v1/responses`는 현재 non-streaming 요청만 지원한다. 두 endpoint 모두 `metadata.workspace`를 run workspace로 전달한다. `metadata`는 OpenAI 표준의 caller-defined string metadata container로 보고, IOP가 특별히 해석하는 key는 `workspace`뿐이다. `/v1/responses`의 `max_output_tokens`, `temperature`, `top_p`, `instructions`, `background`와 `/v1/chat/completions`의 `max_tokens`, `max_completion_tokens`, `temperature`, `top_p` 등은 OpenAI API처럼 top-level field에 둔다. `metadata.source`, `metadata.cli`, `metadata.inference`, 소비자 전용 metadata wrapper, `options`, `think`, `format`, `keep_alive` 같은 provider/Ollama 전용 request field는 지원하지 않는다.
 
 ```bash
 curl -s http://127.0.0.1:18081/v1/chat/completions \
@@ -244,10 +244,10 @@ curl -s http://127.0.0.1:18081/v1/chat/completions \
 ```bash
 curl -s http://127.0.0.1:18081/v1/responses \
   -H 'Content-Type: application/json' \
-  -d '{"model":"qwen3.6:35b-a3b-bf16","input":"hello","stream":false,"metadata":{"request_id":"example","workspace":"/config/workspace/iop","nomadcode":{"task_id":"task-123","source":"manual"}}}'
+  -d '{"model":"qwen3.6:35b-a3b-bf16","instructions":"reply briefly","input":"hello","stream":false,"background":false,"max_output_tokens":256,"temperature":0,"top_p":1,"metadata":{"request_id":"example","workspace":"/config/workspace/iop","task_id":"task-123"}}'
 ```
 
-vLLM 같은 OpenAI-compatible inference server는 `openai_compat` adapter와 `provider: "vllm"` instance로 연결한다. 이 경로는 `/v1/models`, non-streaming/streaming `/v1/chat/completions`, provider header, request `options` 전달을 지원하며, Edge의 model route alias를 실제 served model로 매핑한다.
+vLLM 같은 OpenAI-compatible inference server는 `openai_compat` adapter와 `provider: "vllm"` instance로 연결한다. 이 경로는 `/v1/models`, non-streaming/streaming `/v1/chat/completions`, provider header, 표준 top-level request field 전달을 지원하며, Edge의 model route alias를 실제 served model로 매핑한다.
 
 #### Model Provider Pool 호환 방향
 
diff --git a/apps/edge/internal/edgecmd/smoke_openai.go b/apps/edge/internal/edgecmd/smoke_openai.go
index d00c0a0..74a5bca 100644
--- a/apps/edge/internal/edgecmd/smoke_openai.go
+++ b/apps/edge/internal/edgecmd/smoke_openai.go
@@ -243,10 +243,6 @@ If --base-url is not provided, it auto-discovers the OpenAI URL from the effecti
 			metadata := map[string]interface{}{
 				"request_id": "iop-edge-smoke",
 				"task_id":    "smoke",
-				"source":     "iop-edge-smoke",
-				"inference": map[string]string{
-					"target": smokeModel,
-				},
 			}
 			if smokeWorkspace != "" {
 				metadata["workspace"] = smokeWorkspace
diff --git a/apps/edge/internal/openai/chat_handler.go b/apps/edge/internal/openai/chat_handler.go
index cb4f291..9113b00 100644
--- a/apps/edge/internal/openai/chat_handler.go
+++ b/apps/edge/internal/openai/chat_handler.go
@@ -24,17 +24,17 @@ func (s *Server) handleChatCompletions(w http.ResponseWriter, r *http.Request) {
 	defer r.Body.Close()
 
 	var req chatCompletionRequest
-	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
-		writeError(w, http.StatusBadRequest, "invalid_request_error", "invalid JSON request")
+	if err := decodeChatCompletionRequest(json.NewDecoder(r.Body), &req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_request_error", err.Error())
 		return
 	}
-	runMeta, inferenceTarget, workspace, err := parseOpenAIMetadata(req.Metadata)
+	runMeta, workspace, err := parseOpenAIMetadata(req.Metadata)
 	if err != nil {
 		writeError(w, http.StatusBadRequest, "invalid_request_error", err.Error())
 		return
 	}
 
-	dispatch, ok := s.resolveRouteDispatch(req.Model, inferenceTarget)
+	dispatch, ok := s.resolveRouteDispatch(req.Model)
 	if !ok {
 		writeError(w, http.StatusBadRequest, "invalid_request_error", "model is required")
 		return
@@ -98,11 +98,44 @@ func (s *Server) handleChatCompletions(w http.ResponseWriter, r *http.Request) {
 	s.completeChatCompletion(w, r, req, handle, outputPolicy)
 }
 
+func decodeChatCompletionRequest(dec *json.Decoder, req *chatCompletionRequest) error {
+	var raw map[string]json.RawMessage
+	if err := dec.Decode(&raw); err != nil {
+		return fmt.Errorf("invalid JSON request")
+	}
+	for key := range raw {
+		switch key {
+		case "model", "messages", "stream", "metadata", "max_tokens", "max_completion_tokens", "temperature", "top_p", "presence_penalty", "frequency_penalty", "seed", "stop", "response_format", "tools":
+		default:
+			return fmt.Errorf("%s is not supported for /v1/chat/completions", key)
+		}
+	}
+	normalized, err := json.Marshal(raw)
+	if err != nil {
+		return fmt.Errorf("invalid JSON request")
+	}
+	if err := json.Unmarshal(normalized, req); err != nil {
+		return fmt.Errorf("invalid /v1/chat/completions request format")
+	}
+	if req.MaxTokens != nil && *req.MaxTokens <= 0 {
+		return fmt.Errorf("max_tokens must be greater than zero")
+	}
+	if req.MaxCompletionTokens != nil && *req.MaxCompletionTokens <= 0 {
+		return fmt.Errorf("max_completion_tokens must be greater than zero")
+	}
+	if req.Temperature != nil && (*req.Temperature < 0 || *req.Temperature > 2) {
+		return fmt.Errorf("temperature must be between 0 and 2")
+	}
+	if req.TopP != nil && (*req.TopP < 0 || *req.TopP > 1) {
+		return fmt.Errorf("top_p must be between 0 and 1")
+	}
+	return nil
+}
+
 func chatRunMetadata(runMeta map[string]string, req chatCompletionRequest, outputPolicy strictOutputPolicy) map[string]string {
 	if runMeta == nil {
 		runMeta = make(map[string]string)
 	}
-	runMeta["source"] = "openai"
 	runMeta["openai_model"] = req.Model
 	runMeta["openai_stream"] = fmt.Sprintf("%t", req.Stream)
 	runMeta["strict_output"] = fmt.Sprintf("%t", outputPolicy.Strict)
@@ -149,16 +182,9 @@ func (s *Server) resolveAdapter() string {
 }
 
 func (s *Server) resolveTarget(model string) string {
-	return s.resolveTargetWithOverride(model, "")
-}
-
-func (s *Server) resolveTargetWithOverride(model, override string) string {
 	if s.cfg.Target != "" {
 		return s.cfg.Target
 	}
-	if override != "" {
-		return strings.TrimSpace(override)
-	}
 	return strings.TrimSpace(model)
 }
 
@@ -212,9 +238,8 @@ func (s *Server) findProviderPoolEntry(model string) *config.ModelCatalogEntry {
 
 // resolveRouteDispatch returns fully-resolved dispatch params for model.
 // Priority: provider-pool catalog → legacy model_routes → single-target fallback.
-// metadataTarget is only used in the legacy fallback path.
 // Returns (dispatch, true) on success; (zero, false) when no target can be resolved.
-func (s *Server) resolveRouteDispatch(model, metadataTarget string) (routeDispatch, bool) {
+func (s *Server) resolveRouteDispatch(model string) (routeDispatch, bool) {
 	// Provider-pool catalog takes highest priority.
 	if s.findProviderPoolEntry(model) != nil {
 		return routeDispatch{
@@ -252,7 +277,7 @@ func (s *Server) resolveRouteDispatch(model, metadataTarget string) (routeDispat
 			WorkspaceRequired: route.WorkspaceRequired,
 		}, true
 	}
-	target := s.resolveTargetWithOverride(model, metadataTarget)
+	target := s.resolveTarget(model)
 	if target == "" {
 		return routeDispatch{}, false
 	}
diff --git a/apps/edge/internal/openai/responses_handler.go b/apps/edge/internal/openai/responses_handler.go
index 2088040..6eb5bf3 100644
--- a/apps/edge/internal/openai/responses_handler.go
+++ b/apps/edge/internal/openai/responses_handler.go
@@ -20,8 +20,8 @@ func (s *Server) handleResponses(w http.ResponseWriter, r *http.Request) {
 	defer r.Body.Close()
 
 	var req responsesRequest
-	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
-		writeError(w, http.StatusBadRequest, "invalid_request_error", "invalid JSON request")
+	if err := decodeResponsesRequest(json.NewDecoder(r.Body), &req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_request_error", err.Error())
 		return
 	}
 
@@ -29,6 +29,10 @@ func (s *Server) handleResponses(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusBadRequest, "invalid_request_error", "streaming is not supported for /v1/responses")
 		return
 	}
+	if req.Background {
+		writeError(w, http.StatusBadRequest, "invalid_request_error", "background is not supported for /v1/responses")
+		return
+	}
 
 	inputStr, err := parseResponsesInput(req.Input)
 	if err != nil {
@@ -42,13 +46,13 @@ func (s *Server) handleResponses(w http.ResponseWriter, r *http.Request) {
 		prompt = instruction + "\n" + prompt
 	}
 
-	runMeta, inferenceTarget, workspace, err := parseOpenAIMetadata(req.Metadata)
+	runMeta, workspace, err := parseOpenAIMetadata(req.Metadata)
 	if err != nil {
 		writeError(w, http.StatusBadRequest, "invalid_request_error", err.Error())
 		return
 	}
 
-	dispatch, ok := s.resolveRouteDispatch(req.Model, inferenceTarget)
+	dispatch, ok := s.resolveRouteDispatch(req.Model)
 	if !ok {
 		writeError(w, http.StatusBadRequest, "invalid_request_error", "model is required")
 		return
@@ -58,7 +62,6 @@ func (s *Server) handleResponses(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	runMeta["source"] = "openai-responses"
 	runMeta["openai_model"] = req.Model
 	runMeta["openai_stream"] = fmt.Sprintf("%t", req.Stream)
 	runMeta["strict_output"] = fmt.Sprintf("%t", outputPolicy.Strict)
@@ -105,6 +108,37 @@ func (s *Server) handleResponses(w http.ResponseWriter, r *http.Request) {
 	s.completeResponse(w, r, req, handle, outputPolicy)
 }
 
+func decodeResponsesRequest(dec *json.Decoder, req *responsesRequest) error {
+	var raw map[string]json.RawMessage
+	if err := dec.Decode(&raw); err != nil {
+		return fmt.Errorf("invalid JSON request")
+	}
+	for key := range raw {
+		switch key {
+		case "model", "input", "instructions", "stream", "background", "metadata", "max_output_tokens", "temperature", "top_p":
+		default:
+			return fmt.Errorf("%s is not supported for /v1/responses", key)
+		}
+	}
+	normalized, err := json.Marshal(raw)
+	if err != nil {
+		return fmt.Errorf("invalid JSON request")
+	}
+	if err := json.Unmarshal(normalized, req); err != nil {
+		return fmt.Errorf("invalid /v1/responses request format")
+	}
+	if req.MaxOutputTokens != nil && *req.MaxOutputTokens <= 0 {
+		return fmt.Errorf("max_output_tokens must be greater than zero")
+	}
+	if req.Temperature != nil && (*req.Temperature < 0 || *req.Temperature > 2) {
+		return fmt.Errorf("temperature must be between 0 and 2")
+	}
+	if req.TopP != nil && (*req.TopP < 0 || *req.TopP > 1) {
+		return fmt.Errorf("top_p must be between 0 and 1")
+	}
+	return nil
+}
+
 func (s *Server) completeResponse(w http.ResponseWriter, r *http.Request, req responsesRequest, handle edgeservice.RunResult, outputPolicy strictOutputPolicy) {
 	text, reasoning, _, usage, err := collectRunResult(r.Context(), handle.Stream(), handle.WaitTimeout())
 	if err != nil {
@@ -161,37 +195,60 @@ func parseResponsesInput(raw json.RawMessage) (string, error) {
 
 func buildResponsesPrompt(instructions, input string) string {
 	instructions = strings.TrimSpace(instructions)
-	input = strings.TrimSpace(input)
 	if instructions == "" {
 		return input
 	}
-	return instructions + "\n" + input
+	return instructions + "\n\n" + input
 }
 
-func parseOpenAIMetadata(raw json.RawMessage) (map[string]string, string, string, error) {
+func parseOpenAIMetadata(raw json.RawMessage) (map[string]string, string, error) {
 	if len(raw) == 0 || string(raw) == "null" {
-		return make(map[string]string), "", "", nil
+		return make(map[string]string), "", nil
 	}
 
 	var rawMap map[string]json.RawMessage
 	if err := json.Unmarshal(raw, &rawMap); err != nil {
-		return nil, "", "", fmt.Errorf("metadata must be an object")
+		return nil, "", fmt.Errorf("metadata must be an object")
 	}
 
-	if _, hasCLI := rawMap["cli"]; hasCLI {
-		return nil, "", "", fmt.Errorf("metadata.cli is not supported")
+	if len(rawMap) > 16 {
+		return nil, "", fmt.Errorf("metadata must contain at most 16 keys")
 	}
 
-	var meta responsesMetadata
-	if err := json.Unmarshal(raw, &meta); err != nil {
-		return nil, "", "", fmt.Errorf("invalid metadata format")
+	flat := make(map[string]string, len(rawMap))
+	var workspace string
+	for key, rawValue := range rawMap {
+		if len(key) > 64 {
+			return nil, "", fmt.Errorf("metadata key %q exceeds 64 characters", key)
+		}
+		if key == "source" {
+			return nil, "", fmt.Errorf("metadata.source is not supported")
+		}
+		if key == "workspace" {
+			workspaceValue, err := metadataStringValue(key, rawValue)
+			if err != nil {
+				return nil, "", err
+			}
+			workspace = strings.TrimSpace(workspaceValue)
+			continue
+		}
+		value, err := metadataStringValue(key, rawValue)
+		if err != nil {
+			return nil, "", err
+		}
+		flat[key] = value
 	}
 
-	flat := meta.metadataForRun()
-	inferenceTarget := ""
-	if meta.Inference != nil {
-		inferenceTarget = meta.Inference.Target
-	}
-
-	return flat, inferenceTarget, strings.TrimSpace(meta.Workspace), nil
+	return flat, workspace, nil
+}
+
+func metadataStringValue(key string, raw json.RawMessage) (string, error) {
+	var value string
+	if err := json.Unmarshal(raw, &value); err != nil {
+		return "", fmt.Errorf("metadata.%s must be a string", key)
+	}
+	if len(value) > 512 {
+		return "", fmt.Errorf("metadata.%s exceeds 512 characters", key)
+	}
+	return value, nil
 }
diff --git a/apps/edge/internal/openai/server_test.go b/apps/edge/internal/openai/server_test.go
index ad8fc7e..83f8eec 100644
--- a/apps/edge/internal/openai/server_test.go
+++ b/apps/edge/internal/openai/server_test.go
@@ -184,7 +184,7 @@ func TestChatCompletionsPreservesProviderFinishReason(t *testing.T) {
 	}
 }
 
-func TestChatCompletionsPassesOllamaOptions(t *testing.T) {
+func TestChatCompletionsPassesStandardOptions(t *testing.T) {
 	fake := &fakeRunService{events: make(chan *iop.RunEvent, 2)}
 	fake.events <- &iop.RunEvent{Type: "delta", Delta: "ok"}
 	fake.events <- &iop.RunEvent{Type: "complete"}
@@ -193,12 +193,11 @@ func TestChatCompletionsPassesOllamaOptions(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/v1/chat/completions", strings.NewReader(`{
 		"model":"from-request",
 		"messages":[{"role":"user","content":"hi"}],
-		"options":{"temperature":0.2,"top_p":0.9,"num_predict":32,"stop":["END"]},
 		"max_tokens":12,
 		"temperature":0.1,
-		"keep_alive":"10m",
-		"think":false,
-		"format":"json",
+		"top_p":0.9,
+		"stop":["END"],
+		"response_format":{"type":"json_object"},
 		"tools":[{"type":"function","function":{"name":"lookup"}}]
 	}`))
 	w := httptest.NewRecorder()
@@ -212,14 +211,17 @@ func TestChatCompletionsPassesOllamaOptions(t *testing.T) {
 	if !ok {
 		t.Fatalf("options not passed: %+v", fake.req.Input)
 	}
-	if options["temperature"].(float64) != 0.1 || options["top_p"].(float64) != 0.9 || options["num_predict"].(float64) != 32 {
+	if options["temperature"].(float64) != 0.1 || options["top_p"].(float64) != 0.9 {
 		t.Fatalf("unexpected options: %+v", options)
 	}
 	if options["max_tokens"].(int) != 12 {
 		t.Fatalf("max_tokens not passed: %+v", options)
 	}
-	if fake.req.Input["keep_alive"] != "10m" || fake.req.Input["think"] != false || fake.req.Input["format"] != "json" {
-		t.Fatalf("top-level ollama fields not passed: %+v", fake.req.Input)
+	if _, ok := options["stop"]; !ok {
+		t.Fatalf("stop not passed: %+v", options)
+	}
+	if _, ok := options["response_format"]; !ok {
+		t.Fatalf("response_format not passed: %+v", options)
 	}
 	if tools, ok := fake.req.Input["tools"].([]any); !ok || len(tools) != 1 {
 		t.Fatalf("tools not passed: %+v", fake.req.Input["tools"])
@@ -545,7 +547,7 @@ func TestOpenAIProviderPoolRouteUsesRefreshedCatalog(t *testing.T) {
 		ID:        "model-new",
 		Providers: map[string]string{"prov-a": "served-a"},
 	}})
-	dispatch, ok := srv.resolveRouteDispatch("model-new", "")
+	dispatch, ok := srv.resolveRouteDispatch("model-new")
 	if !ok || !dispatch.ProviderPool {
 		t.Fatalf("expected provider-pool dispatch for refreshed model, got ok=%v dispatch=%+v", ok, dispatch)
 	}
@@ -608,14 +610,19 @@ func TestResponsesDispatchesNonStreamingRequest(t *testing.T) {
 	fake.events <- &iop.RunEvent{Type: "complete", Usage: &iop.Usage{InputTokens: 1, OutputTokens: 1}}
 
 	srv := NewServer(config.EdgeOpenAIConf{
-		Adapter: "ollama",
-		Target:  "llama-fixed",
+		Adapter:    "ollama",
+		Target:     "llama-fixed",
+		SessionID:  "configured-session",
+		TimeoutSec: 42,
 	}, fake, nil)
 	req := httptest.NewRequest(http.MethodPost, "/v1/responses", strings.NewReader(`{
 		"model":"client-model",
 		"input":"say hello",
+		"instructions":"Use short answers.",
 		"max_output_tokens":16,
-		"temperature":0.2
+		"temperature":0.2,
+		"top_p":0.9,
+		"background":false
 	}`))
 	w := httptest.NewRecorder()
 
@@ -627,16 +634,25 @@ func TestResponsesDispatchesNonStreamingRequest(t *testing.T) {
 	if fake.req.Target != "llama-fixed" {
 		t.Fatalf("target: got %q, want llama-fixed", fake.req.Target)
 	}
-	if fake.req.Prompt != "say hello" {
+	if fake.req.Prompt != "Use short answers.\n\nsay hello" {
 		t.Fatalf("prompt: got %q", fake.req.Prompt)
 	}
 	options, ok := fake.req.Input["options"].(map[string]any)
 	if !ok {
 		t.Fatalf("options not passed: %+v", fake.req.Input)
 	}
-	if options["max_tokens"].(int) != 16 || options["temperature"].(float64) != 0.2 {
+	if options["max_tokens"].(int) != 16 || options["temperature"].(float64) != 0.2 || options["top_p"].(float64) != 0.9 {
 		t.Fatalf("unexpected response options: %+v", options)
 	}
+	if fake.req.TimeoutSec != 42 {
+		t.Fatalf("timeout: got %d, want 42", fake.req.TimeoutSec)
+	}
+	if fake.req.SessionID != "configured-session" {
+		t.Fatalf("session_id: got %q, want configured-session", fake.req.SessionID)
+	}
+	if fake.req.Background {
+		t.Fatal("background should remain false for responses")
+	}
 
 	var resp responsesResponse
 	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
@@ -663,6 +679,10 @@ func TestResponsesRejectsUnsupportedRequests(t *testing.T) {
 		{"stream=true", http.MethodPost, `{"model":"m","input":"hi","stream":true}`, http.StatusBadRequest},
 		{"empty input", http.MethodPost, `{"model":"m","input":""}`, http.StatusBadRequest},
 		{"non-string input", http.MethodPost, `{"model":"m","input":["a","b"]}`, http.StatusBadRequest},
+		{"options wrapper unsupported", http.MethodPost, `{"model":"m","input":"hi","options":{"max_output_tokens":16}}`, http.StatusBadRequest},
+		{"background unsupported", http.MethodPost, `{"model":"m","input":"hi","background":true}`, http.StatusBadRequest},
+		{"bad max_output_tokens", http.MethodPost, `{"model":"m","input":"hi","max_output_tokens":0}`, http.StatusBadRequest},
+		{"bad top_p", http.MethodPost, `{"model":"m","input":"hi","top_p":1.5}`, http.StatusBadRequest},
 	}
 
 	for _, tc := range cases {
@@ -677,7 +697,7 @@ func TestResponsesRejectsUnsupportedRequests(t *testing.T) {
 	}
 }
 
-func TestResponsesMetadataContractAndTargetOverride(t *testing.T) {
+func TestResponsesGenericMetadataContract(t *testing.T) {
 	fake := &fakeRunService{events: make(chan *iop.RunEvent, 2)}
 	fake.events <- &iop.RunEvent{Type: "delta", Delta: "ok"}
 	fake.events <- &iop.RunEvent{Type: "complete"}
@@ -689,8 +709,8 @@ func TestResponsesMetadataContractAndTargetOverride(t *testing.T) {
 		"metadata":{
 			"request_id":"req-001",
 			"workspace":"/config/workspace/iop",
-			"inference":{"target":"metadata-target"},
-			"nomadcode":{"task_id":"task-123","source":"nomadcode"}
+			"task_id":"task-123",
+			"custom":"value"
 		}
 	}`))
 	w := httptest.NewRecorder()
@@ -699,8 +719,8 @@ func TestResponsesMetadataContractAndTargetOverride(t *testing.T) {
 	if w.Code != http.StatusOK {
 		t.Fatalf("status: got %d body=%s", w.Code, w.Body.String())
 	}
-	if fake.req.Target != "metadata-target" {
-		t.Fatalf("target: got %q, want metadata-target", fake.req.Target)
+	if fake.req.Target != "client-model" {
+		t.Fatalf("target: got %q, want client-model", fake.req.Target)
 	}
 	if fake.req.Workspace != "/config/workspace/iop" {
 		t.Fatalf("workspace: got %q", fake.req.Workspace)
@@ -711,17 +731,11 @@ func TestResponsesMetadataContractAndTargetOverride(t *testing.T) {
 	if _, ok := fake.req.Metadata["workspace"]; ok {
 		t.Fatal("workspace should not be copied into run metadata")
 	}
-	if fake.req.Metadata["inference.target"] != "metadata-target" {
-		t.Fatalf("inference.target: got %q", fake.req.Metadata["inference.target"])
+	if fake.req.Metadata["task_id"] != "task-123" {
+		t.Fatalf("task_id: got %q", fake.req.Metadata["task_id"])
 	}
-	if fake.req.Metadata["nomadcode.task_id"] != "task-123" {
-		t.Fatalf("nomadcode.task_id: got %q", fake.req.Metadata["nomadcode.task_id"])
-	}
-	if fake.req.Metadata["nomadcode.source"] != "nomadcode" {
-		t.Fatalf("nomadcode.source: got %q", fake.req.Metadata["nomadcode.source"])
-	}
-	if fake.req.Metadata["source"] != "openai-responses" {
-		t.Fatalf("source: got %q", fake.req.Metadata["source"])
+	if fake.req.Metadata["custom"] != "value" {
+		t.Fatalf("custom: got %q", fake.req.Metadata["custom"])
 	}
 	if fake.req.Metadata["openai_model"] != "client-model" {
 		t.Fatalf("openai_model: got %q", fake.req.Metadata["openai_model"])
@@ -749,8 +763,7 @@ func TestChatCompletionsMetadataContractAndWorkspace(t *testing.T) {
 		"metadata":{
 			"request_id":"req-chat-001",
 			"workspace":"/config/workspace/iop",
-			"inference":{"target":"metadata-target"},
-			"nomadcode":{"task_id":"task-123","source":"nomadcode"}
+			"task_id":"task-123"
 		}
 	}`))
 	w := httptest.NewRecorder()
@@ -759,8 +772,8 @@ func TestChatCompletionsMetadataContractAndWorkspace(t *testing.T) {
 	if w.Code != http.StatusOK {
 		t.Fatalf("status: got %d body=%s", w.Code, w.Body.String())
 	}
-	if fake.req.Target != "metadata-target" {
-		t.Fatalf("target: got %q, want metadata-target", fake.req.Target)
+	if fake.req.Target != "client-model" {
+		t.Fatalf("target: got %q, want client-model", fake.req.Target)
 	}
 	if fake.req.Workspace != "/config/workspace/iop" {
 		t.Fatalf("workspace: got %q", fake.req.Workspace)
@@ -768,17 +781,8 @@ func TestChatCompletionsMetadataContractAndWorkspace(t *testing.T) {
 	if fake.req.Metadata["request_id"] != "req-chat-001" {
 		t.Fatalf("request_id: got %q", fake.req.Metadata["request_id"])
 	}
-	if fake.req.Metadata["inference.target"] != "metadata-target" {
-		t.Fatalf("inference.target: got %q", fake.req.Metadata["inference.target"])
-	}
-	if fake.req.Metadata["nomadcode.task_id"] != "task-123" {
-		t.Fatalf("nomadcode.task_id: got %q", fake.req.Metadata["nomadcode.task_id"])
-	}
-	if fake.req.Metadata["nomadcode.source"] != "nomadcode" {
-		t.Fatalf("nomadcode.source: got %q", fake.req.Metadata["nomadcode.source"])
-	}
-	if fake.req.Metadata["source"] != "openai" {
-		t.Fatalf("source: got %q", fake.req.Metadata["source"])
+	if fake.req.Metadata["task_id"] != "task-123" {
+		t.Fatalf("task_id: got %q", fake.req.Metadata["task_id"])
 	}
 	if fake.req.ModelGroupKey != "client-model" {
 		t.Fatalf("model group key: got %q, want client-model", fake.req.ModelGroupKey)
@@ -788,7 +792,7 @@ func TestChatCompletionsMetadataContractAndWorkspace(t *testing.T) {
 	}
 }
 
-func TestChatCompletionsRejectsCLIMetadata(t *testing.T) {
+func TestChatCompletionsRejectsObjectMetadata(t *testing.T) {
 	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "llama"}, &fakeRunService{}, nil)
 	req := httptest.NewRequest(http.MethodPost, "/v1/chat/completions", strings.NewReader(`{
 		"model":"m",
@@ -802,6 +806,65 @@ func TestChatCompletionsRejectsCLIMetadata(t *testing.T) {
 	}
 }
 
+func TestChatCompletionsRejectsUnsupportedFields(t *testing.T) {
+	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "llama"}, &fakeRunService{}, nil)
+	cases := []struct {
+		name string
+		body string
+	}{
+		{"options wrapper", `{"model":"m","messages":[{"role":"user","content":"hi"}],"options":{"num_ctx":8192}}`},
+		{"think", `{"model":"m","messages":[{"role":"user","content":"hi"}],"think":false}`},
+		{"format", `{"model":"m","messages":[{"role":"user","content":"hi"}],"format":"json"}`},
+		{"keep_alive", `{"model":"m","messages":[{"role":"user","content":"hi"}],"keep_alive":"10m"}`},
+		{"bad max_tokens", `{"model":"m","messages":[{"role":"user","content":"hi"}],"max_tokens":0}`},
+		{"bad top_p", `{"model":"m","messages":[{"role":"user","content":"hi"}],"top_p":2}`},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodPost, "/v1/chat/completions", strings.NewReader(tc.body))
+			w := httptest.NewRecorder()
+			srv.routes().ServeHTTP(w, req)
+			if w.Code != http.StatusBadRequest {
+				t.Fatalf("got %d want 400, body=%s", w.Code, w.Body.String())
+			}
+		})
+	}
+}
+
+func TestChatCompletionsRejectsSourceMetadata(t *testing.T) {
+	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "llama"}, &fakeRunService{}, nil)
+	req := httptest.NewRequest(http.MethodPost, "/v1/chat/completions", strings.NewReader(`{
+		"model":"m",
+		"messages":[{"role":"user","content":"hi"}],
+		"metadata":{"source":"manual"}
+	}`))
+	w := httptest.NewRecorder()
+	srv.routes().ServeHTTP(w, req)
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("got %d want 400, body=%s", w.Code, w.Body.String())
+	}
+	if !strings.Contains(w.Body.String(), "metadata.source is not supported") {
+		t.Fatalf("expected source unsupported error, got %s", w.Body.String())
+	}
+}
+
+func TestChatCompletionsRejectsNonStringMetadataValue(t *testing.T) {
+	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "llama"}, &fakeRunService{}, nil)
+	req := httptest.NewRequest(http.MethodPost, "/v1/chat/completions", strings.NewReader(`{
+		"model":"m",
+		"messages":[{"role":"user","content":"hi"}],
+		"metadata":{"attempt":2}
+	}`))
+	w := httptest.NewRecorder()
+	srv.routes().ServeHTTP(w, req)
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("got %d want 400, body=%s", w.Code, w.Body.String())
+	}
+	if !strings.Contains(w.Body.String(), "metadata.attempt must be a string") {
+		t.Fatalf("expected string metadata error, got %s", w.Body.String())
+	}
+}
+
 func TestChatCompletionsRejectsObjectWorkspaceMetadata(t *testing.T) {
 	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "llama"}, &fakeRunService{}, nil)
 	req := httptest.NewRequest(http.MethodPost, "/v1/chat/completions", strings.NewReader(`{
@@ -819,12 +882,12 @@ func TestChatCompletionsRejectsObjectWorkspaceMetadata(t *testing.T) {
 	if w.Code != http.StatusBadRequest {
 		t.Fatalf("got %d want 400, body=%s", w.Code, w.Body.String())
 	}
-	if !strings.Contains(w.Body.String(), "invalid metadata format") {
-		t.Fatalf("expected 'invalid metadata format' error, got %s", w.Body.String())
+	if !strings.Contains(w.Body.String(), "metadata.workspace must be a string") {
+		t.Fatalf("expected workspace string error, got %s", w.Body.String())
 	}
 }
 
-func TestResponsesAcceptsFlatNomadCodeMetadataAliases(t *testing.T) {
+func TestResponsesPreservesGenericTaskMetadata(t *testing.T) {
 	fake := &fakeRunService{events: make(chan *iop.RunEvent, 2)}
 	fake.events <- &iop.RunEvent{Type: "delta", Delta: "ok"}
 	fake.events <- &iop.RunEvent{Type: "complete"}
@@ -835,9 +898,7 @@ func TestResponsesAcceptsFlatNomadCodeMetadataAliases(t *testing.T) {
 		"input":"test",
 		"metadata":{
 			"request_id":"req-flat-001",
-			"task_id":"task-flat",
-			"source":"plane",
-			"inference":{"target":"metadata-target"}
+			"task_id":"task-flat"
 		}
 	}`))
 	w := httptest.NewRecorder()
@@ -846,50 +907,12 @@ func TestResponsesAcceptsFlatNomadCodeMetadataAliases(t *testing.T) {
 	if w.Code != http.StatusOK {
 		t.Fatalf("status: got %d body=%s", w.Code, w.Body.String())
 	}
-	if fake.req.Metadata["nomadcode.task_id"] != "task-flat" {
-		t.Fatalf("nomadcode.task_id: got %q", fake.req.Metadata["nomadcode.task_id"])
-	}
-	if fake.req.Metadata["nomadcode.source"] != "plane" {
-		t.Fatalf("nomadcode.source: got %q", fake.req.Metadata["nomadcode.source"])
-	}
-	if fake.req.Metadata["source"] != "openai-responses" {
-		t.Fatalf("source should remain IOP-owned: got %q", fake.req.Metadata["source"])
+	if fake.req.Metadata["task_id"] != "task-flat" {
+		t.Fatalf("task_id: got %q", fake.req.Metadata["task_id"])
 	}
 }
 
-func TestResponsesStructuredNomadCodeMetadataWinsOverFlatAliases(t *testing.T) {
-	fake := &fakeRunService{events: make(chan *iop.RunEvent, 2)}
-	fake.events <- &iop.RunEvent{Type: "delta", Delta: "ok"}
-	fake.events <- &iop.RunEvent{Type: "complete"}
-
-	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama"}, fake, nil)
-	req := httptest.NewRequest(http.MethodPost, "/v1/responses", strings.NewReader(`{
-		"model":"client-model",
-		"input":"test",
-		"metadata":{
-			"task_id":"task-flat",
-			"source":"plane",
-			"nomadcode":{"task_id":"task-structured","source":"manual"}
-		}
-	}`))
-	w := httptest.NewRecorder()
-	srv.routes().ServeHTTP(w, req)
-
-	if w.Code != http.StatusOK {
-		t.Fatalf("status: got %d body=%s", w.Code, w.Body.String())
-	}
-	if fake.req.Metadata["nomadcode.task_id"] != "task-structured" {
-		t.Fatalf("nomadcode.task_id: got %q", fake.req.Metadata["nomadcode.task_id"])
-	}
-	if fake.req.Metadata["nomadcode.source"] != "manual" {
-		t.Fatalf("nomadcode.source: got %q", fake.req.Metadata["nomadcode.source"])
-	}
-	if fake.req.Metadata["source"] != "openai-responses" {
-		t.Fatalf("source should remain IOP-owned: got %q", fake.req.Metadata["source"])
-	}
-}
-
-func TestResponsesConfiguredTargetWinsOverMetadataTarget(t *testing.T) {
+func TestResponsesConfiguredTargetWinsOverRequestModel(t *testing.T) {
 	fake := &fakeRunService{events: make(chan *iop.RunEvent, 2)}
 	fake.events <- &iop.RunEvent{Type: "delta", Delta: "ok"}
 	fake.events <- &iop.RunEvent{Type: "complete"}
@@ -897,8 +920,7 @@ func TestResponsesConfiguredTargetWinsOverMetadataTarget(t *testing.T) {
 	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "config-target"}, fake, nil)
 	req := httptest.NewRequest(http.MethodPost, "/v1/responses", strings.NewReader(`{
 		"model":"client-model",
-		"input":"test",
-		"metadata":{"inference":{"target":"metadata-target"}}
+		"input":"test"
 	}`))
 	w := httptest.NewRecorder()
 	srv.routes().ServeHTTP(w, req)
@@ -919,7 +941,7 @@ func TestResponsesConfiguredTargetWinsOverMetadataTarget(t *testing.T) {
 	}
 }
 
-func TestResponsesRejectsCLIMetadata(t *testing.T) {
+func TestResponsesRejectsNonStringMetadata(t *testing.T) {
 	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "llama"}, &fakeRunService{}, nil)
 
 	cases := []struct {
@@ -927,7 +949,11 @@ func TestResponsesRejectsCLIMetadata(t *testing.T) {
 		body string
 	}{
 		{"cli only", `{"model":"m","input":"hi","metadata":{"cli":{"flag":"x"}}}`},
-		{"inference and cli", `{"model":"m","input":"hi","metadata":{"inference":{"target":"t"},"cli":{"flag":"x"}}}`},
+		{"inference target", `{"model":"m","input":"hi","metadata":{"inference":{"target":"t"}}}`},
+		{"nomadcode metadata", `{"model":"m","input":"hi","metadata":{"nomadcode":{"task_id":"t"}}}`},
+		{"source metadata", `{"model":"m","input":"hi","metadata":{"source":"manual"}}`},
+		{"number metadata", `{"model":"m","input":"hi","metadata":{"attempt":2}}`},
+		{"boolean metadata", `{"model":"m","input":"hi","metadata":{"urgent":true}}`},
 	}
 
 	for _, tc := range cases {
@@ -959,12 +985,12 @@ func TestResponsesRejectsObjectWorkspaceMetadata(t *testing.T) {
 	if w.Code != http.StatusBadRequest {
 		t.Fatalf("got %d want 400, body=%s", w.Code, w.Body.String())
 	}
-	if !strings.Contains(w.Body.String(), "invalid metadata format") {
-		t.Fatalf("expected 'invalid metadata format' error, got %s", w.Body.String())
+	if !strings.Contains(w.Body.String(), "metadata.workspace must be a string") {
+		t.Fatalf("expected workspace string error, got %s", w.Body.String())
 	}
 }
 
-func TestResponsesReturnsNomadCodeCompatibleShape(t *testing.T) {
+func TestResponsesReturnsOpenAICompatibleShape(t *testing.T) {
 	fake := &fakeRunService{events: make(chan *iop.RunEvent, 3)}
 	fake.events <- &iop.RunEvent{Type: "delta", Delta: "answer"}
 	fake.events <- &iop.RunEvent{Type: "complete", Usage: &iop.Usage{InputTokens: 1, OutputTokens: 1}}
@@ -1041,8 +1067,7 @@ func TestResponsesStrictOutputNormalizesAgentResponse(t *testing.T) {
 	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "llama", StrictOutput: true}, fake, nil)
 	req := httptest.NewRequest(http.MethodPost, "/v1/responses", strings.NewReader(`{
 		"model":"client-model",
-		"instructions":"Once you've completed the user's task, you must use the attempt_completion tool to present the result.\n\n<attempt_completion>\n<result>done</result>\n</attempt_completion>",
-		"input":"finish"
+		"input":"Once you've completed the user's task, you must use the attempt_completion tool to present the result.\n\n<attempt_completion>\n<result>done</result>\n</attempt_completion>\n\nfinish"
 	}`))
 	w := httptest.NewRecorder()
 	srv.routes().ServeHTTP(w, req)
@@ -1272,7 +1297,7 @@ func TestResponsesRouteCatalogDispatchesRoute(t *testing.T) {
 	}
 }
 
-func TestResponsesRouteCatalogTakesPriorityOverMetadataTarget(t *testing.T) {
+func TestResponsesRouteCatalogDispatchesQueuePolicy(t *testing.T) {
 	fake := &fakeRunService{events: make(chan *iop.RunEvent, 2)}
 	fake.events <- &iop.RunEvent{Type: "delta", Delta: "ok"}
 	fake.events <- &iop.RunEvent{Type: "complete"}
@@ -1284,8 +1309,7 @@ func TestResponsesRouteCatalogTakesPriorityOverMetadataTarget(t *testing.T) {
 	}, fake, nil)
 	req := httptest.NewRequest(http.MethodPost, "/v1/responses", strings.NewReader(`{
 		"model":"model-a",
-		"input":"test",
-		"metadata":{"inference":{"target":"metadata-target"}}
+		"input":"test"
 	}`))
 	w := httptest.NewRecorder()
 	srv.routes().ServeHTTP(w, req)
@@ -1304,14 +1328,8 @@ func TestResponsesRouteCatalogTakesPriorityOverMetadataTarget(t *testing.T) {
 	}
 }
 
-func TestChatCompletionsEdgePassesNumCtxForAdapterEnforcement(t *testing.T) {
-	// Edge passes request options.num_ctx to the service unchanged.
-	// The Ollama adapter enforces Edge-owned context_size over this value.
-	fake := &fakeRunService{events: make(chan *iop.RunEvent, 2)}
-	fake.events <- &iop.RunEvent{Type: "delta", Delta: "ok"}
-	fake.events <- &iop.RunEvent{Type: "complete"}
-
-	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "llama"}, fake, nil)
+func TestChatCompletionsRejectsNumCtxOptionsWrapper(t *testing.T) {
+	srv := NewServer(config.EdgeOpenAIConf{Adapter: "ollama", Target: "llama"}, &fakeRunService{}, nil)
 	req := httptest.NewRequest(http.MethodPost, "/v1/chat/completions", strings.NewReader(`{
 		"model":"from-request",
 		"messages":[{"role":"user","content":"hi"}],
@@ -1320,15 +1338,8 @@ func TestChatCompletionsEdgePassesNumCtxForAdapterEnforcement(t *testing.T) {
 	w := httptest.NewRecorder()
 	srv.handleChatCompletions(w, req)
 
-	if w.Code != http.StatusOK {
-		t.Fatalf("status: got %d body=%s", w.Code, w.Body.String())
-	}
-	options, ok := fake.req.Input["options"].(map[string]any)
-	if !ok {
-		t.Fatalf("options not passed to service: %+v", fake.req.Input)
-	}
-	if options["num_ctx"].(float64) != 8192 {
-		t.Fatalf("edge should pass num_ctx unchanged for adapter enforcement: got %v", options["num_ctx"])
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("got %d want 400, body=%s", w.Code, w.Body.String())
 	}
 }
 
@@ -1340,7 +1351,7 @@ func TestResolveRouteDispatchPreservesWorkspaceRequired(t *testing.T) {
 		},
 	}, &fakeRunService{}, nil)
 
-	dispatch, ok := srv.resolveRouteDispatch("codex", "")
+	dispatch, ok := srv.resolveRouteDispatch("codex")
 	if !ok {
 		t.Fatal("expected dispatch to succeed for codex route")
 	}
@@ -1348,7 +1359,7 @@ func TestResolveRouteDispatchPreservesWorkspaceRequired(t *testing.T) {
 		t.Fatalf("expected workspace_required=true for codex route, got false")
 	}
 
-	dispatch, ok = srv.resolveRouteDispatch("llama3", "")
+	dispatch, ok = srv.resolveRouteDispatch("llama3")
 	if !ok {
 		t.Fatal("expected dispatch to succeed for llama3 route")
 	}
@@ -1366,7 +1377,7 @@ func TestResolveRouteDispatchFallbackWorkspaceRequiredFalse(t *testing.T) {
 		},
 	}, &fakeRunService{}, nil)
 
-	dispatch, ok := srv.resolveRouteDispatch("unknown-model", "")
+	dispatch, ok := srv.resolveRouteDispatch("unknown-model")
 	if !ok {
 		t.Fatal("expected fallback dispatch to succeed")
 	}
diff --git a/apps/edge/internal/openai/types.go b/apps/edge/internal/openai/types.go
index 2b40e4c..508141e 100644
--- a/apps/edge/internal/openai/types.go
+++ b/apps/edge/internal/openai/types.go
@@ -10,7 +10,6 @@ type chatCompletionRequest struct {
 	Messages            []chatMessage   `json:"messages"`
 	Stream              bool            `json:"stream"`
 	Metadata            json.RawMessage `json:"metadata,omitempty"`
-	Options             map[string]any  `json:"options,omitempty"`
 	MaxTokens           *int            `json:"max_tokens,omitempty"`
 	MaxCompletionTokens *int            `json:"max_completion_tokens,omitempty"`
 	Temperature         *float64        `json:"temperature,omitempty"`
@@ -20,9 +19,6 @@ type chatCompletionRequest struct {
 	Seed                *int            `json:"seed,omitempty"`
 	Stop                any             `json:"stop,omitempty"`
 	ResponseFormat      any             `json:"response_format,omitempty"`
-	Format              any             `json:"format,omitempty"`
-	KeepAlive           any             `json:"keep_alive,omitempty"`
-	Think               any             `json:"think,omitempty"`
 	Tools               []any           `json:"tools,omitempty"`
 }
 
@@ -61,7 +57,7 @@ func (req chatCompletionRequest) runInput(prompt string, messages []chatMessage,
 		"prompt":   prompt,
 		"messages": chatMessagesInput(messages),
 	}
-	options := cloneOptions(req.Options)
+	options := map[string]any{}
 	if req.MaxTokens != nil {
 		options["max_tokens"] = *req.MaxTokens
 	} else {
@@ -81,15 +77,7 @@ func (req chatCompletionRequest) runInput(prompt string, messages []chatMessage,
 	if len(options) > 0 {
 		input["options"] = options
 	}
-	if req.Format != nil {
-		input["format"] = req.Format
-	}
-	if req.KeepAlive != nil {
-		input["keep_alive"] = req.KeepAlive
-	}
-	if req.Think != nil {
-		input["think"] = req.Think
-	} else if strictOutput {
+	if strictOutput {
 		input["think"] = false
 	}
 	if len(req.Tools) > 0 {
@@ -98,17 +86,6 @@ func (req chatCompletionRequest) runInput(prompt string, messages []chatMessage,
 	return input
 }
 
-func cloneOptions(options map[string]any) map[string]any {
-	if len(options) == 0 {
-		return map[string]any{}
-	}
-	out := make(map[string]any, len(options))
-	for k, v := range options {
-		out[k] = v
-	}
-	return out
-}
-
 func setOptionInt(options map[string]any, key string, val *int) {
 	if val != nil {
 		options[key] = *val
@@ -257,9 +234,9 @@ type responsesRequest struct {
 	Input           json.RawMessage `json:"input"`
 	Instructions    string          `json:"instructions,omitempty"`
 	Stream          bool            `json:"stream"`
+	Background      bool            `json:"background,omitempty"`
 	Metadata        json.RawMessage `json:"metadata,omitempty"`
 	MaxOutputTokens *int            `json:"max_output_tokens,omitempty"`
-	MaxTokens       *int            `json:"max_tokens,omitempty"`
 	Temperature     *float64        `json:"temperature,omitempty"`
 	TopP            *float64        `json:"top_p,omitempty"`
 }
@@ -268,59 +245,12 @@ func (req responsesRequest) providerOptions() map[string]any {
 	options := map[string]any{}
 	if req.MaxOutputTokens != nil {
 		options["max_tokens"] = *req.MaxOutputTokens
-	} else if req.MaxTokens != nil {
-		options["max_tokens"] = *req.MaxTokens
 	}
 	setOptionFloat(options, "temperature", req.Temperature)
 	setOptionFloat(options, "top_p", req.TopP)
 	return options
 }
 
-type responsesMetadata struct {
-	RequestID string                      `json:"request_id,omitempty"`
-	Workspace string                      `json:"workspace,omitempty"`
-	TaskID    string                      `json:"task_id,omitempty"`
-	Source    string                      `json:"source,omitempty"`
-	Inference *responsesInferenceMetadata `json:"inference,omitempty"`
-	NomadCode *responsesNomadCodeMetadata `json:"nomadcode,omitempty"`
-}
-
-type responsesInferenceMetadata struct {
-	Target string `json:"target,omitempty"`
-}
-
-type responsesNomadCodeMetadata struct {
-	TaskID string `json:"task_id,omitempty"`
-	Source string `json:"source,omitempty"`
-}
-
-func (m *responsesMetadata) metadataForRun() map[string]string {
-	out := make(map[string]string)
-	if m.RequestID != "" {
-		out["request_id"] = m.RequestID
-	}
-	if m.Inference != nil && m.Inference.Target != "" {
-		out["inference.target"] = m.Inference.Target
-	}
-	taskID := m.TaskID
-	source := m.Source
-	if m.NomadCode != nil {
-		if m.NomadCode.TaskID != "" {
-			taskID = m.NomadCode.TaskID
-		}
-		if m.NomadCode.Source != "" {
-			source = m.NomadCode.Source
-		}
-	}
-	if taskID != "" {
-		out["nomadcode.task_id"] = taskID
-	}
-	if source != "" {
-		out["nomadcode.source"] = source
-	}
-	return out
-}
-
 type responsesResponse struct {
 	ID         string                `json:"id"`
 	Object     string                `json:"object"`
diff --git a/apps/edge/internal/service/service_test.go b/apps/edge/internal/service/service_test.go
index af5faa6..bb68155 100644
--- a/apps/edge/internal/service/service_test.go
+++ b/apps/edge/internal/service/service_test.go
@@ -151,13 +151,13 @@ func TestBuildRunRequestCopiesMetadata(t *testing.T) {
 		Adapter:  "cli",
 		Target:   "codex",
 		Prompt:   "hello",
-		Metadata: map[string]string{"source": "edge-ops-console", "x-custom": "value"},
+		Metadata: map[string]string{"request_id": "req-001", "x-custom": "value"},
 	})
 	if err != nil {
 		t.Fatalf("BuildRunRequest: %v", err)
 	}
-	if got := req.GetMetadata()["source"]; got != "edge-ops-console" {
-		t.Errorf("source: got %q, want %q", got, "edge-ops-console")
+	if got := req.GetMetadata()["request_id"]; got != "req-001" {
+		t.Errorf("request_id: got %q, want %q", got, "req-001")
 	}
 	if got := req.GetMetadata()["x-custom"]; got != "value" {
 		t.Errorf("x-custom: got %q, want %q", got, "value")
@@ -170,16 +170,14 @@ func TestBuildRunRequestPreservesResponsesMetadataKeys(t *testing.T) {
 		Target:  "llama",
 		Prompt:  "test",
 		Metadata: map[string]string{
-			"request_id":        "req-001",
-			"inference.target":  "metadata-target",
-			"nomadcode.task_id": "task-123",
-			"nomadcode.source":  "nomadcode",
+			"request_id": "req-001",
+			"task_id":    "task-123",
 		},
 	})
 	if err != nil {
 		t.Fatalf("BuildRunRequest: %v", err)
 	}
-	for _, key := range []string{"request_id", "inference.target", "nomadcode.task_id", "nomadcode.source"} {
+	for _, key := range []string{"request_id", "task_id"} {
 		if req.GetMetadata()[key] == "" {
 			t.Errorf("metadata key %q not preserved", key)
 		}
diff --git a/scripts/e2e-openai-cli-workspace.sh b/scripts/e2e-openai-cli-workspace.sh
index 785972b..c74d51e 100755
--- a/scripts/e2e-openai-cli-workspace.sh
+++ b/scripts/e2e-openai-cli-workspace.sh
@@ -133,7 +133,7 @@ done
 RESPONSES_OUT="$TMP_DIR/responses.json"
 curl -fsS \
     -H "Content-Type: application/json" \
-    -d '{"model":"'"$MODEL"'","input":"echo '\''marker_content'\'' > marker.txt && echo '\''IOP_CLI_SMOKE_OK'\''","stream":false,"metadata":{"request_id":"e2e-openai-cli-workspace","task_id":"task-smoke","source":"manual","workspace":"'"$WORKSPACE"'","inference":{"target":"smoke-sh"}}}' \
+    -d '{"model":"'"$MODEL"'","input":"echo '\''marker_content'\'' > marker.txt && echo '\''IOP_CLI_SMOKE_OK'\''","stream":false,"metadata":{"request_id":"e2e-openai-cli-workspace","task_id":"task-smoke","workspace":"'"$WORKSPACE"'"}}' \
     "http://127.0.0.1:$OPENAI_PORT/v1/responses" > "$RESPONSES_OUT"
 
 grep -q "IOP_CLI_SMOKE_OK" "$RESPONSES_OUT"
diff --git a/scripts/e2e-openai-lemonade.sh b/scripts/e2e-openai-lemonade.sh
index 595a38f..a13f0aa 100755
--- a/scripts/e2e-openai-lemonade.sh
+++ b/scripts/e2e-openai-lemonade.sh
@@ -254,7 +254,7 @@ grep -q "$MODEL" "$MODELS_OUT"
 CHAT_OUT="$TMP_DIR/chat.json"
 curl -fsS \
     -H "Content-Type: application/json" \
-    -d '{"model":"client-request-model","think":false,"options":{"max_tokens":32},"messages":[{"role":"user","content":"Reply with exactly: smoke token"}]}' \
+    -d '{"model":"client-request-model","max_tokens":32,"messages":[{"role":"user","content":"Reply with exactly: smoke token"}]}' \
     "http://127.0.0.1:$OPENAI_PORT/v1/chat/completions" > "$CHAT_OUT"
 if [ "$MODE" = "fake" ]; then
     grep -q "IOP_OPENAI_LEMONADE_OK" "$CHAT_OUT"
@@ -269,7 +269,7 @@ fi
 STREAM_OUT="$TMP_DIR/stream.txt"
 curl -fsS -N \
     -H "Content-Type: application/json" \
-    -d '{"model":"client-request-model","stream":true,"think":false,"options":{"max_tokens":32},"messages":[{"role":"user","content":"Reply with exactly: stream token"}]}' \
+    -d '{"model":"client-request-model","stream":true,"max_tokens":32,"messages":[{"role":"user","content":"Reply with exactly: stream token"}]}' \
     "http://127.0.0.1:$OPENAI_PORT/v1/chat/completions" > "$STREAM_OUT"
 if [ "$MODE" = "fake" ]; then
     grep -q '"reasoning_content":"thinking..."' "$STREAM_OUT"
diff --git a/scripts/e2e-openai-ollama.sh b/scripts/e2e-openai-ollama.sh
index 4435359..c26e9bb 100755
--- a/scripts/e2e-openai-ollama.sh
+++ b/scripts/e2e-openai-ollama.sh
@@ -203,7 +203,7 @@ grep -q "reasoning_content" "$CHAT_OUT"
 RESPONSES_OUT="$TMP_DIR/responses.json"
 curl -fsS \
     -H "Content-Type: application/json" \
-    -d '{"model":"client-request-model","input":"say the responses test token","stream":false,"metadata":{"request_id":"e2e-openai-ollama","task_id":"task-smoke","source":"manual","inference":{"target":"fake-ollama-model"}}}' \
+    -d '{"model":"client-request-model","input":"say the responses test token","stream":false,"metadata":{"request_id":"e2e-openai-ollama","task_id":"task-smoke"}}' \
     "http://127.0.0.1:$OPENAI_PORT/v1/responses" > "$RESPONSES_OUT"
 grep -q "IOP_OPENAI_OLLAMA_OK" "$RESPONSES_OUT"
 grep -q '"output_text"' "$RESPONSES_OUT"
diff --git a/scripts/e2e-openai-vllm.sh b/scripts/e2e-openai-vllm.sh
index 54ad8b8..d84c3ec 100755
--- a/scripts/e2e-openai-vllm.sh
+++ b/scripts/e2e-openai-vllm.sh
@@ -251,7 +251,7 @@ grep -q "$ROUTE_ALIAS" "$MODELS_OUT"
 CHAT_OUT="$TMP_DIR/chat.json"
 curl -fsS \
     -H "Content-Type: application/json" \
-    -d "{\"model\":\"$ROUTE_ALIAS\",\"think\":false,\"options\":{\"max_tokens\":32},\"messages\":[{\"role\":\"user\",\"content\":\"Reply with exactly: smoke token\"}]}" \
+    -d "{\"model\":\"$ROUTE_ALIAS\",\"max_tokens\":32,\"messages\":[{\"role\":\"user\",\"content\":\"Reply with exactly: smoke token\"}]}" \
     "http://127.0.0.1:$OPENAI_PORT/v1/chat/completions" > "$CHAT_OUT"
 if [ "$MODE" = "fake" ]; then
     grep -q "IOP_OPENAI_VLLM_OK" "$CHAT_OUT"
@@ -264,7 +264,7 @@ grep -q '"finish_reason":"' "$CHAT_OUT"
 STREAM_OUT="$TMP_DIR/stream.txt"
 curl -fsS -N \
     -H "Content-Type: application/json" \
-    -d "{\"model\":\"$ROUTE_ALIAS\",\"stream\":true,\"think\":false,\"options\":{\"max_tokens\":32},\"messages\":[{\"role\":\"user\",\"content\":\"Reply with exactly: stream token\"}]}" \
+    -d "{\"model\":\"$ROUTE_ALIAS\",\"stream\":true,\"max_tokens\":32,\"messages\":[{\"role\":\"user\",\"content\":\"Reply with exactly: stream token\"}]}" \
     "http://127.0.0.1:$OPENAI_PORT/v1/chat/completions" > "$STREAM_OUT"
 if [ "$MODE" = "fake" ]; then
     grep -q '"content":"IOP_OPENAI_"' "$STREAM_OUT"