fix(#770): cost/clear/memory/ultraplan/model with args now return interactive_only instead of falling to credential check

ROADMAP.md

@@ -7705,3 +7705,5 @@ Original filing (2026-04-18): the session emitted `SessionStart hook (completed)
 768. **`claw --resume latest compact` returned `error_kind:"unknown"` + `hint:null`** — dogfooded 2026-05-27 on `89735dbd` (gaebal-gajae pinpoint against `d29a8e21`, revised ID after #766/#767 landed). Resume trailing-arg validator emitted single-line `"--resume trailing arguments must be slash commands"` with no typed prefix and no `\n` hint. Fix: (1) changed error to `"invalid_resume_argument: \`{token}\` is not a slash command.\nUsage: claw --resume <session-id|latest> /<slash-command>"` so `split_error_hint()` extracts the hint; (2) added `invalid_resume_argument` classifier arm; (3) unit test assertion + integration test `resume_non_slash_trailing_arg_has_typed_error_kind_and_hint_768` added. 34 CLI contract tests pass. [SCOPE: claw-code] Source: Gaebal-gajae + Jobdori probe on `89735dbd`, 2026-05-27.
 
 769. **`claw session bogus` fell through to credential check instead of interactive-only guidance** — dogfooded 2026-05-27 on `b778d4e3` (tracked as #767). `claw session <anything>` with more than one token bypassed `parse_single_word_command_alias` (which only fires for `rest.len()==1`) and had no match arm in `parse_args`, so `rest.join(" ")` became a prompt literal dispatched to `CliAction::Prompt`, hitting `missing_credentials` at the gate. Fix: added `"session"` match arm that emits `interactive_only:` error with `\n`-delimited hint referencing `--resume SESSION.jsonl /session` and REPL usage. Integration test `session_with_unknown_subcommand_returns_interactive_only_not_credentials_767` asserts `error_kind:interactive_only` + non-null hint for `bogus`, `nuke`, `delete-all`. 35 CLI contract tests pass. [SCOPE: claw-code] Source: Jobdori probe on `b778d4e3`, 2026-05-27.
+
+770. **`claw cost/clear/memory/ultraplan/model` with trailing args fell to credential check** — dogfooded 2026-05-27 on `9e1be056`. Same fallthrough gap as #767/#769: these slash-only verbs had no multi-arg match arms, so `claw cost breakdown`, `claw clear --force`, `claw memory reset`, `claw ultraplan bogus`, `claw model opus extra` all became `CliAction::Prompt` literals, hitting `missing_credentials` at the gate. Fix: added `"cost"`, `"clear"`, `"memory"`, `"ultraplan"`, `"model" if rest.len() > 1` match arms, each returning `interactive_only:` + `\n`-delimited hint. Integration test `slash_only_verbs_with_args_return_interactive_only_not_credentials_770` asserts all five cases. 36 CLI contract tests pass. [SCOPE: claw-code] Source: Jobdori sweep on `9e1be056`, 2026-05-27.

rust/crates/rusty-claude-cli/src/main.rs

@@ -1175,6 +1175,28 @@ fn parse_args(args: &[String]) -> Result<CliAction, String> {
                 "interactive_only: `claw session` is a slash command{action_hint}.\nUse `claw --resume SESSION.jsonl /session <action>` or start `claw` and run `/session [list|exists|switch|fork|delete]`."
             ))
         }
+        // #770: same fallthrough gap as #767 — these slash commands had no multi-arg match arm
+        // and fell to CliAction::Prompt reaching the credential gate when called with args.
+        "cost" => Err(
+            "interactive_only: `claw cost` is a slash command.\nUse `claw --resume SESSION.jsonl /cost` or start `claw` and run `/cost`."
+                .to_string(),
+        ),
+        "clear" => Err(
+            "interactive_only: `claw clear` is a slash command.\nUse `claw --resume SESSION.jsonl /clear [--confirm]` or start `claw` and run `/clear`."
+                .to_string(),
+        ),
+        "memory" => Err(
+            "interactive_only: `claw memory` is a slash command.\nStart `claw` and run `/memory` inside the REPL."
+                .to_string(),
+        ),
+        "ultraplan" => Err(
+            "interactive_only: `claw ultraplan` is a slash command.\nStart `claw` and run `/ultraplan` inside the REPL."
+                .to_string(),
+        ),
+        "model" if rest.len() > 1 => Err(
+            "interactive_only: `claw model` is a slash command.\nStart `claw` and run `/model [model-name]` inside the REPL."
+                .to_string(),
+        ),
         "skills" => {
             let args = join_optional_args(&rest[1..]);
             if let Some(action) = args.as_deref() {

rust/crates/rusty-claude-cli/tests/output_format_contract.rs

@@ -2019,3 +2019,60 @@ fn session_with_unknown_subcommand_returns_interactive_only_not_credentials_767(
         );
     }
 }
+
+#[test]
+fn slash_only_verbs_with_args_return_interactive_only_not_credentials_770() {
+    // #770: `claw cost breakdown`, `claw clear --force`, `claw memory reset`,
+    // `claw ultraplan bogus`, `claw model opus extra` all fell through to
+    // CliAction::Prompt and reached the credential gate, returning
+    // error_kind:"missing_credentials". These are all slash-only commands;
+    // any multi-token invocation should return interactive_only guidance.
+    let root = unique_temp_dir("slash-verbs-770");
+    fs::create_dir_all(&root).expect("temp dir should exist");
+
+    let cases: &[&[&str]] = &[
+        &["cost", "breakdown"],
+        &["clear", "--force"],
+        &["memory", "reset"],
+        &["ultraplan", "bogus"],
+        &["model", "opus", "extra"],
+    ];
+
+    for args in cases {
+        let full_args: Vec<&str> = std::iter::once("--output-format")
+            .chain(std::iter::once("json"))
+            .chain(args.iter().copied())
+            .collect();
+        let output = run_claw(&root, &full_args, &[]);
+        assert!(
+            !output.status.success(),
+            "claw {} should exit non-zero",
+            args.join(" ")
+        );
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        let json_line = stderr
+            .lines()
+            .find(|l| l.trim_start().starts_with('{'))
+            .unwrap_or_else(|| {
+                panic!(
+                    "claw {} stderr should contain JSON, got: {stderr}",
+                    args.join(" ")
+                )
+            });
+        let parsed: serde_json::Value =
+            serde_json::from_str(json_line).expect("error envelope should be valid JSON");
+
+        assert_eq!(
+            parsed["error_kind"],
+            "interactive_only",
+            "claw {} must return error_kind:interactive_only (#770), not missing_credentials",
+            args.join(" ")
+        );
+        let hint = parsed["hint"].as_str().unwrap_or("");
+        assert!(
+            !hint.is_empty(),
+            "claw {} must return non-null hint (#770)",
+            args.join(" ")
+        );
+    }
+}