diff --git a/ROADMAP.md b/ROADMAP.md
index 39e18147..f865f08d 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -7689,3 +7689,5 @@ Original filing (2026-04-18): the session emitted `SessionStart hook (completed)
 760. **`agent_not_found` and `plugin_not_found` error envelopes lacked `hint` field** — dogfooded 2026-05-26 on `ef31328a`. `claw agents show nonexistent-agent --output-format json` returned `error_kind:"agent_not_found"` with `hint: null`; same for `claw plugins show`. Both structured JSON envelopes in `commands/src/lib.rs` and `main.rs` omitted `hint`. Fix: added `"hint": "Run \`claw agents list\` to see available agents."` to the `agent_not_found` envelope; `"hint": "Run \`claw plugins list\` to see available plugins."` to the `plugin_not_found` envelope. Source: Jobdori dogfood sweep on `ef31328a`, 2026-05-26.
 
 761. **`mcp show <nonexistent>` and `skills show <nonexistent>` returned `hint: null`** — dogfooded 2026-05-27 on `7fa81b5d`. `server_not_found` envelope in `render_mcp_show_json` and `skill_not_found` envelope in `print_skills` JSON path both lacked `hint` fields, unlike `agent_not_found`/`plugin_not_found` fixed in #760. Fix: added `"hint": "Run \`claw mcp list\` to see configured servers."` to `server_not_found` and `"hint": "Run \`claw skills list\` to see available skills."` to `skill_not_found`. All four `*_not_found` envelopes now have hints. Source: Jobdori dogfood sweep on `7fa81b5d`, 2026-05-27.
+
+762. **`classify_error_kind` unit test missing coverage for 15 of 23 classifier arms** — dogfooded 2026-05-27 on `d83de563`. `classify_error_kind_returns_correct_discriminants` only asserted 8 of the 23 arms, leaving `missing_flag_value`, `invalid_flag_value`, `missing_prompt`, `interactive_only`, `unknown_agents_subcommand`, `agent_not_found`, `plugin_not_found`, `skill_not_found`, `unsupported_config_section`, `no_managed_sessions`, `legacy_session_no_workspace_binding`, `missing_manifests`, `unknown_plugins_action`, `unsupported_skills_action`, and `confirmation_required` uncovered. Any discriminant string drift would silently fall to `"unknown"` without a failing test. Fix: added 18 new `assert_eq!` invocations covering all previously untested arms. Source: Jobdori test-brittleness sweep on `d83de563`, 2026-05-27.
diff --git a/rust/crates/rusty-claude-cli/src/main.rs b/rust/crates/rusty-claude-cli/src/main.rs
index afd110cb..2caa6417 100644
--- a/rust/crates/rusty-claude-cli/src/main.rs
+++ b/rust/crates/rusty-claude-cli/src/main.rs
@@ -12833,6 +12833,88 @@ mod tests {
             classify_error_kind("something completely unknown"),
             "unknown"
         );
+        // #762: coverage for all classifier arms added since #77 — prevents silent fallback
+        // to "unknown" if discriminant strings drift.
+        assert_eq!(
+            classify_error_kind("Manifest source files are missing: /tmp/x"),
+            "missing_manifests"
+        );
+        assert_eq!(
+            classify_error_kind("no managed sessions found in /tmp"),
+            "no_managed_sessions"
+        );
+        assert_eq!(
+            classify_error_kind("legacy session is missing workspace binding"),
+            "legacy_session_no_workspace_binding"
+        );
+        assert_eq!(
+            classify_error_kind("unsupported skills action: bogus. Supported actions: list"),
+            "unsupported_skills_action"
+        );
+        assert_eq!(
+            classify_error_kind(
+                "missing_flag_value: missing value for --model.\nUsage: --model <provider/model>"
+            ),
+            "missing_flag_value"
+        );
+        assert_eq!(
+            classify_error_kind("invalid_flag_value: unsupported permission mode 'bogus'.\nUsage: --permission-mode read-only|workspace-write|danger-full-access"),
+            "invalid_flag_value"
+        );
+        assert_eq!(
+            classify_error_kind("is not yet implemented"),
+            "unsupported_command"
+        );
+        assert_eq!(
+            classify_error_kind("confirmation required before running destructive operation"),
+            "confirmation_required"
+        );
+        assert_eq!(
+            classify_error_kind("api returned unexpected status 429"),
+            "api_http_error"
+        );
+        assert_eq!(
+            classify_error_kind("interactive_only: this command requires an interactive terminal"),
+            "interactive_only"
+        );
+        assert_eq!(
+            classify_error_kind("slash command /compact is interactive-only"),
+            "interactive_only"
+        );
+        assert_eq!(
+            classify_error_kind("unknown agents subcommand: bogus. Supported: list, show, help"),
+            "unknown_agents_subcommand"
+        );
+        assert_eq!(
+            classify_error_kind("agent not found: my-agent"),
+            "agent_not_found"
+        );
+        assert_eq!(
+            classify_error_kind("my-plugin is not installed"),
+            "plugin_not_found"
+        );
+        assert_eq!(
+            classify_error_kind("skill source /path/to/skill not found"),
+            "skill_not_found"
+        );
+        assert_eq!(
+            classify_error_kind("skill 'my-skill' does not exist"),
+            "skill_not_found"
+        );
+        assert_eq!(
+            classify_error_kind("Unsupported config section 'show'. Use: env, hooks, model"),
+            "unsupported_config_section"
+        );
+        assert_eq!(
+            classify_error_kind("unknown_plugins_action: bogus"),
+            "unknown_plugins_action"
+        );
+        assert_eq!(
+            classify_error_kind(
+                "missing_prompt: -p requires a prompt string.\nUsage: claw -p <text>"
+            ),
+            "missing_prompt"
+        );
     }
 
     #[test]