feat: validate receive files list args

docs/current-status-card.md

@@ -28,6 +28,7 @@ Remote base before local roadmap commits: `b2d839e Merge branch 'codex/n15-repor
 - `isphere_receive_messages` now returns the contract-facing `ok`, `conversation`, `messages`, `next_cursor`, and `audit` envelope while retaining legacy parser-native message fields for compatibility.
 - `isphere_receive_messages` accepts the read-contract argument set for the current local-readonly path: `conversation_id`, `query`, `since`, `limit`, `include_attachment_metadata`, `source_preference`, `preview`, and empty `cursor`.
 - `isphere_search_contacts` and `isphere_search_groups` accept and validate the safe search-contract args for the current local-readonly path.
+- `isphere_receive_files` list mode accepts and validates the safe file-list contract args for the current local-readonly path while keeping download blocked.
 - N12-pre and N12R documents define safe offline evidence intake and internal-sandbox live UIA capture procedures.
 - N13/N14/N15 produced selector catalog/report validation infrastructure, but those are supporting validation assets only.
 
@@ -54,7 +55,7 @@ N13/N14/N15 are pre-business validation results. They can help identify UI eleme
 
 ## Current loop
 
-Current loop: `Stage C / Loop C22 - file receive remaining contract argument validation`.
+Current loop: `Stage C / Loop C23 - contact/group display-name source precheck`.
 
 Plan file: `docs/superpowers/plans/2026-07-09-stage-c-log-backed-receive-messages-loop.md`.
 
@@ -88,10 +89,11 @@ Current loop output so far:
 19. C19: `isphere_receive_messages` gained RFC3339 `since` filtering against PacketReader epoch-millisecond timestamps plus invalid-since error handling.
 20. C20: `isphere_receive_messages` now accepts and validates the remaining safe read-contract args, rejects unsupported source/cursor cases, and can suppress inline attachment metadata.
 21. C21: `isphere_search_contacts` and `isphere_search_groups` now accept and validate safe search-contract args, while rejecting unsupported source/cursor cases.
+22. C22: `isphere_receive_files` list mode now accepts and validates safe contract args, rejects unsupported source/cursor/output/download cases, and keeps download blocked.
 
 ## Next business mainline
 
-1. Run Stage C Loop C22: apply the same safe-argument validation pattern to `isphere_receive_files` list mode while keeping download blocked.
+1. Run Stage C Loop C23: inspect whether current evidence can enrich contact/group display names beyond JID-only identities.
 2. Leave `isphere_send_message` blocked until bridge/API, UIA action-chain, or protocol connector evidence is validated.
 3. Leave actual file download/cache mapping as a later connector node until a message-to-cache hash or client download source is validated.
 4. Keep UIA selector/report work as fallback support, not as the primary roadmap.

docs/go-mcp-runbook.md

@@ -187,7 +187,7 @@ Allowed parameters:
 - `isphere_receive_messages`: `conversation_id`, `query`, `since`, `include_attachment_metadata`, `source_preference`, `preview`, `cursor`, `limit` only. `since` must be RFC3339/RFC3339Nano when supplied; `source_preference` currently supports empty/`auto`/`local_readonly`; `cursor` must be empty until pagination is implemented.
 - `isphere_search_contacts`: `query`, `cursor`, `source_preference`, `include_inactive`, `limit` only. `source_preference` currently supports empty/`auto`/`local_readonly`; `cursor` must be empty until pagination is implemented.
 - `isphere_search_groups`: `query`, `cursor`, `source_preference`, `include_archived`, `limit` only. `source_preference` currently supports empty/`auto`/`local_readonly`; `cursor` must be empty until pagination is implemented.
-- `isphere_receive_files`: `conversation_id`, `message_id`, `file_id`, `name_contains`, `mode`, `limit` only. C14 supports `mode` empty or `list`; download is deferred.
+- `isphere_receive_files`: `conversation_id`, `message_id`, `file_id`, `name_contains`, `mode`, `output_dir`, `cursor`, `source_preference`, `preview`, `limit` only. C22 supports `mode` empty or `list`; `source_preference` currently supports empty/`auto`/`local_readonly`; `cursor` and `output_dir` must be empty in current list-only mode; download is deferred.
 
 ## 9. Current tool surface and next-stage route
 
@@ -202,7 +202,7 @@ The current runbook verifies eight tools:
 - `isphere_search_groups`
 - `isphere_receive_files`
 
-The current log-backed business read tools have parser/source/tool registration and an empty default server source. Raw N12-pre evidence remains under ignored `runs/` paths and is not committed. The current command entry point can read an operator-local encrypted PacketReader log-line file via `ISPHERE_PACKET_LOG_FILE` or a directory of `.log`/`.txt` files via `ISPHERE_PACKET_LOG_DIR`; this is still not a production ingestion claim because raw evidence remains local and uncommitted. `isphere_receive_messages` now exposes contract-facing fields for digital-employee consumption while preserving older aliases for compatibility, supports `conversation_id`, keyword `query`, and RFC3339 `since` filtering, and validates the remaining safe contract args without pretending unsupported connectors/pagination exist. Contact and group search also accept the safe local-readonly contract args. `isphere_receive_files` currently supports list mode only; download/cache mapping is deferred.
+The current log-backed business read tools have parser/source/tool registration and an empty default server source. Raw N12-pre evidence remains under ignored `runs/` paths and is not committed. The current command entry point can read an operator-local encrypted PacketReader log-line file via `ISPHERE_PACKET_LOG_FILE` or a directory of `.log`/`.txt` files via `ISPHERE_PACKET_LOG_DIR`; this is still not a production ingestion claim because raw evidence remains local and uncommitted. `isphere_receive_messages` now exposes contract-facing fields for digital-employee consumption while preserving older aliases for compatibility, supports `conversation_id`, keyword `query`, and RFC3339 `since` filtering, and validates the remaining safe contract args without pretending unsupported connectors/pagination exist. Contact and group search also accept the safe local-readonly contract args. `isphere_receive_files` supports list mode with safe contract arg validation; download/cache mapping remains deferred.
 
 Core business tools for contacts, groups, messages, and files are defined in `docs/mcp-core-tools-contract.md`. Send capabilities enter the roadmap through that contract after source discovery, connector selection, preview metadata, execution metadata, and audit records are in place.
 

docs/source-discovery/capability-source-matrix.md

@@ -20,7 +20,7 @@ Schema notes: `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md`
 | `isphere_receive_messages` | decrypted `PacketReader.ProcessPacket` XMPP `<message>` stanzas via `internal/isphere.EncryptedPacketLogSource`; configured by `ISPHERE_PACKET_LOG_FILE` or `ISPHERE_PACKET_LOG_DIR` | decrypted `Smark.SendReceive` transport stanzas; decrypted `SaveToDB` `Chat_OnMessageArrived` traces; wrapped `MsgLib.db` after DB wrapper is solved | `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md#field-mapping-evidence` | C20 supports and validates the current safe receive-message contract args; default source remains empty when unset | apply safe contract args to contact/group search |
 | `isphere_search_contacts` | bare sender/receiver JIDs extracted from normalized log-backed messages loaded from configured PacketReader file or directory source | decrypted roster/contact stanzas from `Smark.SendReceive`; `MsgLib.db` contact/conversation tables after DB wrapper is solved; UIA helper source if display names are missing | `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md#log-decryption-result` | C21 verifies safe search-contract args plus default/configured contact smokes; JID-only display/account fallback | enrich display names from roster/db/uia evidence |
 | `isphere_search_groups` | decrypted `PacketReader.ProcessPacket` `type="groupchat"` stanzas and conference/MUC JIDs loaded from configured PacketReader file or directory source | `MsgLib.db` group/conversation tables after DB wrapper is solved; UIA helper source if group display names are missing | C9 ignored-log scan: PacketReader 86 groupchat/86 conference hits; Smark 24 groupchat/658 conference/631 muc hits | C21 verifies safe search-contract args plus default/configured group smokes; JID-only display fallback | enrich group display/member data from roster/db/uia evidence |
-| `isphere_receive_files` | decrypted `PacketReader.ProcessPacket` file-transfer message stanzas via `internal/isphere.ListFilesFromMessages` and `isphere_receive_files` list mode; configured PacketReader file or directory source; `zyl\importal\<hash>` cache entries remain unlinked | decrypted `Smark.SendReceive` and `SaveToDB` traces for file-reference reconciliation; future UIA/client connector for download | `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md#c12-file-transfer-evidence-precheck` | C16 verification covers default, configured-file, and configured-directory file-list smoke; no log-to-cache/download mapping yet | defer download mapping; align read-tool contract output |
+| `isphere_receive_files` | decrypted `PacketReader.ProcessPacket` file-transfer message stanzas via `internal/isphere.ListFilesFromMessages` and `isphere_receive_files` list mode; configured PacketReader file or directory source; `zyl\importal\<hash>` cache entries remain unlinked | decrypted `Smark.SendReceive` and `SaveToDB` traces for file-reference reconciliation; future UIA/client connector for download | `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md#c12-file-transfer-evidence-precheck` | C22 verifies safe file-list contract args; no log-to-cache/download mapping yet | defer download mapping; precheck contact/group display-name evidence |
 | `isphere_send_message` | none validated yet | existing bridge/API/local service preferred; UIA write connector only after internal-sandbox action evidence; network/protocol connector only after protocol discovery | `docs/source-discovery/2026-07-10-send-message-source-precheck.md` | C15 blocked: contract exists, but no committed bridge/API/local service, helper write op, UIA action chain, or protocol connector is validated | do not implement write behavior; harden existing read source configuration |
 | `isphere_send_file` | none validated yet | depends on send-message connector plus outbound file/upload evidence | `docs/source-discovery/2026-07-10-send-message-source-precheck.md` | blocked behind `isphere_send_message` connector selection and file upload/source policy | defer until send-message connector is validated |
 

docs/superpowers/plans/2026-07-09-stage-c-log-backed-receive-messages-loop.md

@@ -1816,19 +1816,19 @@ Implemented and verified in this loop:
 - Accept empty `output_dir` in list mode; reject non-empty `output_dir` unless/until download mode is implemented to avoid implying files were written.
 - Keep mode empty/`list` only; continue rejecting `download`.
 
-- [ ] **Step 1: Write failing file MCP arg tests**
+- [x] **Step 1: Write failing file MCP arg tests**
 
 Extend `internal/tools/isphere_files_test.go` with accepted safe args and rejected unsupported source/cursor/output/download cases.
 
-- [ ] **Step 2: Implement file arg validation**
+- [x] **Step 2: Implement file arg validation**
 
 Reuse local-readonly source/cursor validation and add output/download list-mode checks.
 
-- [ ] **Step 3: Update verification and docs**
+- [x] **Step 3: Update verification and docs**
 
 Update `scripts/verify-go-mcp.ps1`, runbook, status card, matrix, and this plan.
 
-- [ ] **Step 4: Run full verification and commit**
+- [x] **Step 4: Run full verification and commit**
 
 Run:
 
@@ -1843,6 +1843,58 @@ Expected: all exit 0. Remove any generated root `isphere-mcp.exe` after build. C
 
 ---
 
+## Loop C22 Result
+
+Implemented and verified in this loop:
+
+- `isphere_receive_files` list mode now accepts safe contract args `cursor`, `source_preference`, `preview`, and `output_dir`.
+- It accepts empty/`auto`/`local_readonly` source preference and rejects unsupported connector selections until those sources exist.
+- It accepts empty cursor and rejects non-empty cursor until pagination exists.
+- It accepts empty `output_dir` in list mode and rejects non-empty `output_dir` to avoid implying a download/write happened.
+- It continues to reject `download` mode until message-to-cache/download mapping is validated.
+- `scripts/verify-go-mcp.ps1` now exercises file-list safe args in default and configured source smokes.
+
+---
+
+## Loop C23: Contact/group display-name source precheck
+
+**Goal:** Decide whether the current N12-pre evidence contains a safe source for human-readable contact/group display names, because current contact/group tools expose JID-derived identities only.
+
+**Planned files:**
+- Modify: `docs/source-discovery/capability-source-matrix.md`
+- Modify: `docs/current-status-card.md`
+- Modify: `docs/superpowers/plans/2026-07-09-stage-c-log-backed-receive-messages-loop.md`
+- Optionally create a focused source-discovery note under `docs/source-discovery/` if evidence is non-trivial.
+- Optionally create ignored metadata under `runs/`; do not commit raw logs or user content.
+
+**Planned behavior:**
+- Inspect committed schema notes and ignored metadata/log summaries for roster/contact display names, group display names, aliases, departments, or conversation-title fields.
+- If evidence is enough, write C24 as a source implementation loop for display-name enrichment.
+- If evidence is not enough, keep JID-only behavior explicit and choose the next business-read hardening node.
+- Do not add write/send/file-download behavior.
+
+- [ ] **Step 1: Inspect current evidence**
+
+Use committed source-discovery docs first; only inspect ignored local summaries/counts if needed. Do not commit raw evidence.
+
+- [ ] **Step 2: Update matrix/status and next loop**
+
+Record whether display-name enrichment can proceed and rewrite C24 accordingly.
+
+- [ ] **Step 3: Verify and commit docs**
+
+Run:
+
+```powershell
+git diff --check
+go test ./...
+powershell -NoProfile -ExecutionPolicy Bypass -File scripts/verify-go-mcp.ps1
+```
+
+Expected: all exit 0. Commit exact C23 paths only and rewrite the next loop from actual results.
+
+---
+
 ## Self-Review
 
 - Spec coverage: the plan follows the user's cyclic requirement: plan first, implement one loop at a time, update the next loop after each result, and ask only on blockers.

internal/tools/isphere_files.go

@@ -14,12 +14,16 @@ import (
 const ToolNameReceiveFiles = "isphere_receive_files"
 
 type ReceiveFilesArgs struct {
-	ConversationID string `json:"conversation_id,omitempty" jsonschema:"conversation id filter for file listing"`
+	ConversationID   string `json:"conversation_id,omitempty" jsonschema:"conversation id filter for file listing"`
-	MessageID      string `json:"message_id,omitempty" jsonschema:"message id filter for file listing"`
+	MessageID        string `json:"message_id,omitempty" jsonschema:"message id filter for file listing"`
-	FileID         string `json:"file_id,omitempty" jsonschema:"file id filter for file listing"`
+	FileID           string `json:"file_id,omitempty" jsonschema:"file id filter for file listing"`
-	NameContains   string `json:"name_contains,omitempty" jsonschema:"case-insensitive filename substring filter"`
+	NameContains     string `json:"name_contains,omitempty" jsonschema:"case-insensitive filename substring filter"`
-	Mode           string `json:"mode,omitempty" jsonschema:"file receive mode; C14 supports list only"`
+	Mode             string `json:"mode,omitempty" jsonschema:"file receive mode; C14 supports list only"`
-	Limit          int    `json:"limit,omitempty" jsonschema:"maximum number of files to return; zero or negative returns all matches"`
+	OutputDir        string `json:"output_dir,omitempty" jsonschema:"download output directory; not accepted in current list-only mode"`
+	Cursor           string `json:"cursor,omitempty" jsonschema:"pagination cursor; currently only empty cursor is supported"`
+	SourcePreference string `json:"source_preference,omitempty" jsonschema:"source selector; currently supports auto or local_readonly only"`
+	Preview          bool   `json:"preview,omitempty" jsonschema:"accepted for contract compatibility in list mode"`
+	Limit            int    `json:"limit,omitempty" jsonschema:"maximum number of files to return; zero or negative returns all matches"`
 }
 
 func RegisterISphereFileTools(server *mcp.Server, source ReceiveMessagesSource) {
@@ -39,6 +43,12 @@ func RegisterISphereFileTools(server *mcp.Server, source ReceiveMessagesSource)
 		if mode != "list" {
 			return nil, nil, fmt.Errorf("isphere_receive_files mode %q is not available; only list is supported", input.Mode)
 		}
+		if err := validateLocalReadonlySourceAndCursor(ToolNameReceiveFiles, input.SourcePreference, input.Cursor); err != nil {
+			return nil, nil, err
+		}
+		if strings.TrimSpace(input.OutputDir) != "" {
+			return nil, nil, fmt.Errorf("isphere_receive_files output_dir is only available for download mode, which is not implemented yet")
+		}
 		messages, err := source.ReceiveMessages(ctx, isphere.ReceiveMessagesQuery{Limit: 0})
 		if err != nil {
 			return nil, nil, err

internal/tools/isphere_files_test.go

@@ -88,3 +88,70 @@ func TestISphereReceiveFilesToolReturnsLogBackedFiles(t *testing.T) {
 		t.Fatalf("source queries = %+v, want one unbounded receive query", fake.queries)
 	}
 }
+
+func TestISphereReceiveFilesToolValidatesContractArgs(t *testing.T) {
+	fake := &fakeReceiveMessagesSource{
+		result: isphere.ReceiveMessagesResult{Messages: []isphere.Message{{
+			ID:             "msg-file-1",
+			ConversationID: "alice@imopenfire1-lanzhou|bob@imopenfire1-lanzhou",
+			Text:           "redacted-report.docx",
+			Timestamp:      "1783423807000",
+			Subject:        "FILE_TRANSFER_CANCEL",
+		}}},
+	}
+	session, cleanup := connectToolsTestSession(t, func(server *mcp.Server) {
+		RegisterISphereFileTools(server, fake)
+	})
+	defer cleanup()
+
+	callResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
+		Name: ToolNameReceiveFiles,
+		Arguments: map[string]any{
+			"mode":              "list",
+			"name_contains":     "report",
+			"source_preference": "local_readonly",
+			"preview":           true,
+			"cursor":            "",
+			"output_dir":        "",
+			"limit":             5,
+		},
+	})
+	if err != nil {
+		t.Fatalf("call with safe contract args: %v", err)
+	}
+	if callResult.IsError {
+		t.Fatalf("call result is error: %+v", callResult)
+	}
+
+	bridgeResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
+		Name:      ToolNameReceiveFiles,
+		Arguments: map[string]any{"mode": "list", "source_preference": "bridge"},
+	})
+	if err == nil && !bridgeResult.IsError {
+		t.Fatalf("bridge source_preference was accepted before connector exists")
+	}
+
+	cursorResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
+		Name:      ToolNameReceiveFiles,
+		Arguments: map[string]any{"mode": "list", "cursor": "next-page"},
+	})
+	if err == nil && !cursorResult.IsError {
+		t.Fatalf("non-empty cursor was accepted before pagination exists")
+	}
+
+	outputResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
+		Name:      ToolNameReceiveFiles,
+		Arguments: map[string]any{"mode": "list", "output_dir": "C:\\tmp\\isphere"},
+	})
+	if err == nil && !outputResult.IsError {
+		t.Fatalf("output_dir was accepted in list mode before download exists")
+	}
+
+	downloadResult, err := session.CallTool(context.Background(), &mcp.CallToolParams{
+		Name:      ToolNameReceiveFiles,
+		Arguments: map[string]any{"mode": "download", "file_id": "msg-file-1:redacted-report.docx"},
+	})
+	if err == nil && !downloadResult.IsError {
+		t.Fatalf("download mode was accepted before cache mapping exists")
+	}
+}

scripts/verify-go-mcp.ps1

@@ -567,7 +567,15 @@ func verifySearchGroups(ctx context.Context, session *mcp.ClientSession, query s
 
 
 func verifyReceiveFiles(ctx context.Context, session *mcp.ClientSession, nameContains string, step string, wantCount int, wantFileID string, wantFileName string) int {
-	callResult, err := session.CallTool(ctx, &mcp.CallToolParams{Name: "isphere_receive_files", Arguments: map[string]any{"mode": "list", "name_contains": nameContains, "limit": 5}})
+	callResult, err := session.CallTool(ctx, &mcp.CallToolParams{Name: "isphere_receive_files", Arguments: map[string]any{
+		"mode": "list",
+		"name_contains": nameContains,
+		"source_preference": "local_readonly",
+		"preview": true,
+		"cursor": "",
+		"output_dir": "",
+		"limit": 5,
+	}})
 	if err != nil {
 		fail(step, err)
 	}