diff --git a/pkg/ludus.js b/pkg/ludus.js
index 957068d..e93e3ac 100644
--- a/pkg/ludus.js
+++ b/pkg/ludus.js
@@ -23,19 +23,19 @@ function handle_messages (e) {
   }
   for (const msg of msgs) {
     switch (msg.verb) {
-      case "complete": {
+      case "Complete": {
         console.log("Main: ludus completed with => ", msg.data)
         ludus_result = msg.data
         running = false
         break
       }
       // TODO: do more than report these
-      case "console": {
+      case "Console": {
         console.log("Main: ludus says => ", msg.data)
         ludus_console = ludus_console + msg.data
         break
       }
-      case "commands": {
+      case "Commands": {
         console.log("Main: ludus commands => ", msg.data)
         for (const command of msg.data) {
           ludus_commands.push(command)
@@ -68,7 +68,7 @@ export function run (source) {
   if (running) "TODO: handle this? should not be running"
   running = true
   code = source
-  outbox = [{verb: "run", data: source}]
+  outbox = [{verb: "Run", data: source}]
   start_io_polling()
 }
 
@@ -80,12 +80,12 @@ export function is_running() {
 // kills a ludus script
 export function kill () {
   running = false
-  outbox.push({verb: "kill"})
+  outbox.push({verb: "Kill"})
 }
 
 // sends text into ludus (status: not working)
 export function input (text) {
-  outbox.push({verb: "input", data: text})
+  outbox.push({verb: "Input", data: text})
 }
 
 // returns the contents of the ludus console and resets the console
diff --git a/pkg/rudus.d.ts b/pkg/rudus.d.ts
index 2c9353f..0ee0693 100644
--- a/pkg/rudus.d.ts
+++ b/pkg/rudus.d.ts
@@ -14,8 +14,8 @@ export interface InitOutput {
   readonly __wbindgen_malloc: (a: number, b: number) => number;
   readonly __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
   readonly __wbindgen_export_6: WebAssembly.Table;
-  readonly closure323_externref_shim: (a: number, b: number, c: any) => void;
-  readonly closure336_externref_shim: (a: number, b: number, c: any, d: any) => void;
+  readonly closure342_externref_shim: (a: number, b: number, c: any) => void;
+  readonly closure366_externref_shim: (a: number, b: number, c: any, d: any) => void;
   readonly __wbindgen_start: () => void;
 }
 
diff --git a/pkg/rudus.js b/pkg/rudus.js
index e89f8ba..cc24b0e 100644
--- a/pkg/rudus.js
+++ b/pkg/rudus.js
@@ -17,6 +17,22 @@ function handleError(f, args) {
     }
 }
 
+function logError(f, args) {
+    try {
+        return f.apply(this, args);
+    } catch (e) {
+        let error = (function () {
+            try {
+                return e instanceof Error ? `${e.message}\n\nStack:\n${e.stack}` : e.toString();
+            } catch(_) {
+                return "<failed to stringify thrown value>";
+            }
+        }());
+        console.error("wasm-bindgen: imported JS function that was not marked as `catch` threw an error:", error);
+        throw e;
+    }
+}
+
 const cachedTextDecoder = (typeof TextDecoder !== 'undefined' ? new TextDecoder('utf-8', { ignoreBOM: true, fatal: true }) : { decode: () => { throw Error('TextDecoder not available') } } );
 
 if (typeof TextDecoder !== 'undefined') { cachedTextDecoder.decode(); };
@@ -54,6 +70,8 @@ const encodeString = (typeof cachedTextEncoder.encodeInto === 'function'
 
 function passStringToWasm0(arg, malloc, realloc) {
 
+    if (typeof(arg) !== 'string') throw new Error(`expected a string argument, found ${typeof(arg)}`);
+
     if (realloc === undefined) {
         const buf = cachedTextEncoder.encode(arg);
         const ptr = malloc(buf.length, 1) >>> 0;
@@ -82,7 +100,7 @@ function passStringToWasm0(arg, malloc, realloc) {
         ptr = realloc(ptr, len, len = offset + arg.length * 3, 1) >>> 0;
         const view = getUint8ArrayMemory0().subarray(ptr + offset, ptr + len);
         const ret = encodeString(arg, view);
-
+        if (ret.read !== arg.length) throw new Error('failed to pass whole string');
         offset += ret.written;
         ptr = realloc(ptr, len, offset, 1) >>> 0;
     }
@@ -104,6 +122,12 @@ function isLikeNone(x) {
     return x === undefined || x === null;
 }
 
+function _assertBoolean(n) {
+    if (typeof(n) !== 'boolean') {
+        throw new Error(`expected a boolean argument, found ${typeof(n)}`);
+    }
+}
+
 const CLOSURE_DTORS = (typeof FinalizationRegistry === 'undefined')
     ? { register: () => {}, unregister: () => {} }
     : new FinalizationRegistry(state => {
@@ -134,6 +158,71 @@ function makeMutClosure(arg0, arg1, dtor, f) {
     CLOSURE_DTORS.register(real, state, state);
     return real;
 }
+
+function debugString(val) {
+    // primitive types
+    const type = typeof val;
+    if (type == 'number' || type == 'boolean' || val == null) {
+        return  `${val}`;
+    }
+    if (type == 'string') {
+        return `"${val}"`;
+    }
+    if (type == 'symbol') {
+        const description = val.description;
+        if (description == null) {
+            return 'Symbol';
+        } else {
+            return `Symbol(${description})`;
+        }
+    }
+    if (type == 'function') {
+        const name = val.name;
+        if (typeof name == 'string' && name.length > 0) {
+            return `Function(${name})`;
+        } else {
+            return 'Function';
+        }
+    }
+    // objects
+    if (Array.isArray(val)) {
+        const length = val.length;
+        let debug = '[';
+        if (length > 0) {
+            debug += debugString(val[0]);
+        }
+        for(let i = 1; i < length; i++) {
+            debug += ', ' + debugString(val[i]);
+        }
+        debug += ']';
+        return debug;
+    }
+    // Test for built-in
+    const builtInMatches = /\[object ([^\]]+)\]/.exec(toString.call(val));
+    let className;
+    if (builtInMatches && builtInMatches.length > 1) {
+        className = builtInMatches[1];
+    } else {
+        // Failed to match the standard '[object ClassName]'
+        return toString.call(val);
+    }
+    if (className == 'Object') {
+        // we're a user defined class or Object
+        // JSON.stringify avoids problems with cycles, and is generally much
+        // easier than looping through ownProperties of `val`.
+        try {
+            return 'Object(' + JSON.stringify(val) + ')';
+        } catch (_) {
+            return 'Object';
+        }
+    }
+    // errors
+    if (val instanceof Error) {
+        return `${val.name}: ${val.message}\n${val.stack}`;
+    }
+    // TODO we could test for more things here, like `Set`s and `Map`s.
+    return className;
+}
 /**
  * @param {string} src
  * @returns {Promise<string>}
@@ -145,12 +234,19 @@ export function ludus(src) {
     return ret;
 }
 
-function __wbg_adapter_20(arg0, arg1, arg2) {
-    wasm.closure323_externref_shim(arg0, arg1, arg2);
+function _assertNum(n) {
+    if (typeof(n) !== 'number') throw new Error(`expected a number argument, found ${typeof(n)}`);
+}
+function __wbg_adapter_22(arg0, arg1, arg2) {
+    _assertNum(arg0);
+    _assertNum(arg1);
+    wasm.closure342_externref_shim(arg0, arg1, arg2);
 }
 
-function __wbg_adapter_48(arg0, arg1, arg2, arg3) {
-    wasm.closure336_externref_shim(arg0, arg1, arg2, arg3);
+function __wbg_adapter_50(arg0, arg1, arg2, arg3) {
+    _assertNum(arg0);
+    _assertNum(arg1);
+    wasm.closure366_externref_shim(arg0, arg1, arg2, arg3);
 }
 
 async function __wbg_load(module, imports) {
@@ -195,7 +291,7 @@ function __wbg_get_imports() {
         const ret = arg0.call(arg1, arg2);
         return ret;
     }, arguments) };
-    imports.wbg.__wbg_error_7534b8e9a36f1ab4 = function(arg0, arg1) {
+    imports.wbg.__wbg_error_7534b8e9a36f1ab4 = function() { return logError(function (arg0, arg1) {
         let deferred0_0;
         let deferred0_1;
         try {
@@ -205,7 +301,7 @@ function __wbg_get_imports() {
         } finally {
             wasm.__wbindgen_free(deferred0_0, deferred0_1, 1);
         }
-    };
+    }, arguments) };
     imports.wbg.__wbg_io_5a3c8ea72d8c6ea3 = function() { return handleError(function (arg0, arg1) {
         let deferred0_0;
         let deferred0_1;
@@ -218,7 +314,7 @@ function __wbg_get_imports() {
             wasm.__wbindgen_free(deferred0_0, deferred0_1, 1);
         }
     }, arguments) };
-    imports.wbg.__wbg_log_86d603e98cc11395 = function(arg0, arg1) {
+    imports.wbg.__wbg_log_86d603e98cc11395 = function() { return logError(function (arg0, arg1) {
         let deferred0_0;
         let deferred0_1;
         try {
@@ -228,8 +324,8 @@ function __wbg_get_imports() {
         } finally {
             wasm.__wbindgen_free(deferred0_0, deferred0_1, 1);
         }
-    };
-    imports.wbg.__wbg_log_edeb598b620f1ba2 = function(arg0, arg1) {
+    }, arguments) };
+    imports.wbg.__wbg_log_edeb598b620f1ba2 = function() { return logError(function (arg0, arg1) {
         let deferred0_0;
         let deferred0_1;
         try {
@@ -239,15 +335,15 @@ function __wbg_get_imports() {
         } finally {
             wasm.__wbindgen_free(deferred0_0, deferred0_1, 1);
         }
-    };
-    imports.wbg.__wbg_new_23a2665fac83c611 = function(arg0, arg1) {
+    }, arguments) };
+    imports.wbg.__wbg_new_23a2665fac83c611 = function() { return logError(function (arg0, arg1) {
         try {
             var state0 = {a: arg0, b: arg1};
             var cb0 = (arg0, arg1) => {
                 const a = state0.a;
                 state0.a = 0;
                 try {
-                    return __wbg_adapter_48(a, state0.b, arg0, arg1);
+                    return __wbg_adapter_50(a, state0.b, arg0, arg1);
                 } finally {
                     state0.a = a;
                 }
@@ -257,65 +353,65 @@ function __wbg_get_imports() {
         } finally {
             state0.a = state0.b = 0;
         }
-    };
-    imports.wbg.__wbg_new_8a6f238a6ece86ea = function() {
+    }, arguments) };
+    imports.wbg.__wbg_new_8a6f238a6ece86ea = function() { return logError(function () {
         const ret = new Error();
         return ret;
-    };
-    imports.wbg.__wbg_newnoargs_105ed471475aaf50 = function(arg0, arg1) {
+    }, arguments) };
+    imports.wbg.__wbg_newnoargs_105ed471475aaf50 = function() { return logError(function (arg0, arg1) {
         const ret = new Function(getStringFromWasm0(arg0, arg1));
         return ret;
-    };
-    imports.wbg.__wbg_now_8dddb61fa4928554 = function() {
+    }, arguments) };
+    imports.wbg.__wbg_now_8dddb61fa4928554 = function() { return logError(function () {
         const ret = Date.now();
         return ret;
-    };
-    imports.wbg.__wbg_queueMicrotask_97d92b4fcc8a61c5 = function(arg0) {
+    }, arguments) };
+    imports.wbg.__wbg_queueMicrotask_97d92b4fcc8a61c5 = function() { return logError(function (arg0) {
         queueMicrotask(arg0);
-    };
-    imports.wbg.__wbg_queueMicrotask_d3219def82552485 = function(arg0) {
+    }, arguments) };
+    imports.wbg.__wbg_queueMicrotask_d3219def82552485 = function() { return logError(function (arg0) {
         const ret = arg0.queueMicrotask;
         return ret;
-    };
-    imports.wbg.__wbg_random_57c118f142535bb6 = function() {
+    }, arguments) };
+    imports.wbg.__wbg_random_57c118f142535bb6 = function() { return logError(function () {
         const ret = Math.random();
         return ret;
-    };
-    imports.wbg.__wbg_resolve_4851785c9c5f573d = function(arg0) {
+    }, arguments) };
+    imports.wbg.__wbg_resolve_4851785c9c5f573d = function() { return logError(function (arg0) {
         const ret = Promise.resolve(arg0);
         return ret;
-    };
-    imports.wbg.__wbg_stack_0ed75d68575b0f3c = function(arg0, arg1) {
+    }, arguments) };
+    imports.wbg.__wbg_stack_0ed75d68575b0f3c = function() { return logError(function (arg0, arg1) {
         const ret = arg1.stack;
         const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
         const len1 = WASM_VECTOR_LEN;
         getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
         getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
-    };
-    imports.wbg.__wbg_static_accessor_GLOBAL_88a902d13a557d07 = function() {
+    }, arguments) };
+    imports.wbg.__wbg_static_accessor_GLOBAL_88a902d13a557d07 = function() { return logError(function () {
         const ret = typeof global === 'undefined' ? null : global;
         return isLikeNone(ret) ? 0 : addToExternrefTable0(ret);
-    };
-    imports.wbg.__wbg_static_accessor_GLOBAL_THIS_56578be7e9f832b0 = function() {
+    }, arguments) };
+    imports.wbg.__wbg_static_accessor_GLOBAL_THIS_56578be7e9f832b0 = function() { return logError(function () {
         const ret = typeof globalThis === 'undefined' ? null : globalThis;
         return isLikeNone(ret) ? 0 : addToExternrefTable0(ret);
-    };
-    imports.wbg.__wbg_static_accessor_SELF_37c5d418e4bf5819 = function() {
+    }, arguments) };
+    imports.wbg.__wbg_static_accessor_SELF_37c5d418e4bf5819 = function() { return logError(function () {
         const ret = typeof self === 'undefined' ? null : self;
         return isLikeNone(ret) ? 0 : addToExternrefTable0(ret);
-    };
-    imports.wbg.__wbg_static_accessor_WINDOW_5de37043a91a9c40 = function() {
+    }, arguments) };
+    imports.wbg.__wbg_static_accessor_WINDOW_5de37043a91a9c40 = function() { return logError(function () {
         const ret = typeof window === 'undefined' ? null : window;
         return isLikeNone(ret) ? 0 : addToExternrefTable0(ret);
-    };
-    imports.wbg.__wbg_then_44b73946d2fb3e7d = function(arg0, arg1) {
+    }, arguments) };
+    imports.wbg.__wbg_then_44b73946d2fb3e7d = function() { return logError(function (arg0, arg1) {
         const ret = arg0.then(arg1);
         return ret;
-    };
-    imports.wbg.__wbg_then_48b406749878a531 = function(arg0, arg1, arg2) {
+    }, arguments) };
+    imports.wbg.__wbg_then_48b406749878a531 = function() { return logError(function (arg0, arg1, arg2) {
         const ret = arg0.then(arg1, arg2);
         return ret;
-    };
+    }, arguments) };
     imports.wbg.__wbindgen_cb_drop = function(arg0) {
         const obj = arg0.original;
         if (obj.cnt-- == 1) {
@@ -323,11 +419,19 @@ function __wbg_get_imports() {
             return true;
         }
         const ret = false;
+        _assertBoolean(ret);
         return ret;
     };
-    imports.wbg.__wbindgen_closure_wrapper969 = function(arg0, arg1, arg2) {
-        const ret = makeMutClosure(arg0, arg1, 324, __wbg_adapter_20);
+    imports.wbg.__wbindgen_closure_wrapper7647 = function() { return logError(function (arg0, arg1, arg2) {
+        const ret = makeMutClosure(arg0, arg1, 343, __wbg_adapter_22);
         return ret;
+    }, arguments) };
+    imports.wbg.__wbindgen_debug_string = function(arg0, arg1) {
+        const ret = debugString(arg1);
+        const ptr1 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len1 = WASM_VECTOR_LEN;
+        getDataViewMemory0().setInt32(arg0 + 4 * 1, len1, true);
+        getDataViewMemory0().setInt32(arg0 + 4 * 0, ptr1, true);
     };
     imports.wbg.__wbindgen_init_externref_table = function() {
         const table = wasm.__wbindgen_export_2;
@@ -341,10 +445,12 @@ function __wbg_get_imports() {
     };
     imports.wbg.__wbindgen_is_function = function(arg0) {
         const ret = typeof(arg0) === 'function';
+        _assertBoolean(ret);
         return ret;
     };
     imports.wbg.__wbindgen_is_undefined = function(arg0) {
         const ret = arg0 === undefined;
+        _assertBoolean(ret);
         return ret;
     };
     imports.wbg.__wbindgen_string_get = function(arg0, arg1) {
diff --git a/pkg/rudus_bg.wasm b/pkg/rudus_bg.wasm
index d9ca655..d7ca997 100644
Binary files a/pkg/rudus_bg.wasm and b/pkg/rudus_bg.wasm differ
diff --git a/pkg/rudus_bg.wasm.d.ts b/pkg/rudus_bg.wasm.d.ts
index 99af8eb..f0ff0f2 100644
--- a/pkg/rudus_bg.wasm.d.ts
+++ b/pkg/rudus_bg.wasm.d.ts
@@ -9,6 +9,6 @@ export const __wbindgen_free: (a: number, b: number, c: number) => void;
 export const __wbindgen_malloc: (a: number, b: number) => number;
 export const __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
 export const __wbindgen_export_6: WebAssembly.Table;
-export const closure323_externref_shim: (a: number, b: number, c: any) => void;
-export const closure336_externref_shim: (a: number, b: number, c: any, d: any) => void;
+export const closure342_externref_shim: (a: number, b: number, c: any) => void;
+export const closure366_externref_shim: (a: number, b: number, c: any, d: any) => void;
 export const __wbindgen_start: () => void;
diff --git a/pkg/worker.js b/pkg/worker.js
index d539da4..ac860a3 100644
--- a/pkg/worker.js
+++ b/pkg/worker.js
@@ -36,7 +36,7 @@ async function run(e) {
   let msgs = e.data
   for (const msg of msgs) {
     // evaluate source if we get some
-    if (msg.verb === "run" && typeof msg.data === 'string') {
+    if (msg.verb === "Run" && typeof msg.data === 'string') {
       // temporarily stash an empty function so we don't keep calling this one if we receive additional messages
       onmessage = () => {}
       // actually run the ludus--which will call `io`--and replace `run` as the event handler for ipc
diff --git a/src/io.rs b/src/io.rs
index f91af40..d2f19e7 100644
--- a/src/io.rs
+++ b/src/io.rs
@@ -47,27 +47,27 @@ impl MsgOut {
             MsgOut::Complete(value) => match value {
                 Ok(value) => {
                     log(format!("value is: {}", value.show()));
-                    make_json_payload("complete", serde_json::to_string(&value.show()).unwrap())
+                    make_json_payload("Complete", serde_json::to_string(&value.show()).unwrap())
                 },
-                Err(_) => make_json_payload("complete", "\"null\"".to_string())
+                Err(_) => make_json_payload("Complete", "\"null\"".to_string())
             },
             MsgOut::Commands(commands) => {
                 let commands = commands.as_list();
                 let vals_json = commands.iter().map(|v| v.to_json().unwrap()).collect::<Vec<_>>().join(",");
                 let vals_json = format!("[{vals_json}]");
-                make_json_payload("commands", vals_json)
+                make_json_payload("Commands", vals_json)
             }
             MsgOut::SlurpRequest(value) => {
                 // TODO: do parsing here?
                 // Right now, defer to fetch
                 let url = value.to_json().unwrap();
-                make_json_payload("slurp", url)
+                make_json_payload("Fetch", url)
             }
             MsgOut::Console(lines) => {
                 let lines = lines.as_list();
                 let json_lines = lines.iter().map(|line| line.stringify()).collect::<Vec<_>>().join("\\n");
                 let json_lines = format!("\"{json_lines}\"");
-                make_json_payload("console", json_lines)
+                make_json_payload("Console", json_lines)
             }
         }
     }
@@ -77,7 +77,7 @@ impl MsgOut {
 #[serde(tag = "verb", content = "data")]
 pub enum MsgIn {
     Input(String),
-    SlurpResponse(String, String, String),
+    Fetch(String, String, String),
     Kill,
     Keyboard(Vec<String>),
 }
@@ -85,8 +85,8 @@ pub enum MsgIn {
 impl std::fmt::Display for MsgIn {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         match self {
-            MsgIn::Input(str) => write!(f, "input: {str}"),
-            MsgIn::Kill => write!(f, "kill"),
+            MsgIn::Input(str) => write!(f, "Input: {str}"),
+            MsgIn::Kill => write!(f, "Kill"),
             _ => todo!()
         }
     }
@@ -96,7 +96,7 @@ impl MsgIn {
     pub fn to_value(self) -> Value {
         match self {
             MsgIn::Input(str) => Value::string(str),
-            MsgIn::SlurpResponse(url, status, string) => {
+            MsgIn::Fetch(url, status, string) => {
                 let url = Value::string(url);
                 let status = Value::keyword(status);
                 let string = Value::string(string);
@@ -124,6 +124,7 @@ pub async fn do_io (msgs: Vec<MsgOut>) -> Vec<MsgIn> {
         Err(_) => return vec![]
     };
     let inbox = inbox.as_string().expect("response should be a string");
+    log(format!("got a message: {inbox}"));
     let inbox: Vec<MsgIn> = serde_json::from_str(inbox.as_str()).expect("response from js should be valid");
     if !inbox.is_empty() {
         log("ludus received messages".to_string());