diff --git a/packages/codemode/AGENTS.md b/packages/codemode/AGENTS.md
index cbea866d4e..232665ccfb 100644
--- a/packages/codemode/AGENTS.md
+++ b/packages/codemode/AGENTS.md
@@ -4,6 +4,7 @@
 - Do not add a speculative generic permission or approval policy. A host omits tools it does not expose and enforces domain authorization inside each provided tool.
 - Keep Code Mode unaware of host session, channel, and conversation models. The hosting application supplies trusted execution scope around it.
 - Tool schemas are the model-facing Interface. Keep arguments minimal and natural to the operation; never add unrelated IDs as ambient capability tokens.
+- State model-visible diagnostics, logs, tool descriptions, and instructions directly. The execution context is already clear; do not repeat `Code Mode` or `CodeMode` unless the distinction is necessary.
 - When interpreter behavior or support changes, update `interpreter-support.md` and direct tests in the same PR.
 
 ## OpenAPI
diff --git a/packages/codemode/src/interpreter/methods.ts b/packages/codemode/src/interpreter/methods.ts
index dc2f6bb5c6..79a014ba4f 100644
--- a/packages/codemode/src/interpreter/methods.ts
+++ b/packages/codemode/src/interpreter/methods.ts
@@ -126,7 +126,7 @@ export const invokeIntrinsic = <R>(
   if (ref.receiver instanceof CodeModeURLSearchParams) {
     return invokeURLSearchParamsMethod(runner, ref.receiver, ref.name, args, node)
   }
-  throw new InterpreterRuntimeError(`Method '${ref.name}' is not available in CodeMode.`, node)
+  throw new InterpreterRuntimeError(`Method '${ref.name}' is not available.`, node)
 }
 
 const coerceNumericArgument = <R>(
@@ -157,8 +157,7 @@ const coerceNumericArgument = <R>(
 }
 
 export const invokeGlobalMethod = (ref: GlobalMethodReference, args: Array<unknown>, node: AstNode): unknown => {
-  if (ref.namespace === "console")
-    throw new InterpreterRuntimeError(`console.${ref.name} is not available in CodeMode.`, node)
+  if (ref.namespace === "console") throw new InterpreterRuntimeError(`console.${ref.name} is not available.`, node)
   if (ref.namespace === "Object") return invokeObjectMethod(ref.name, args, node)
   if (ref.namespace === "Math") return invokeMathMethod(ref.name, args, node)
   if (ref.namespace === "Array") return invokeArrayStatic(ref.name, args, node)
@@ -168,9 +167,9 @@ export const invokeGlobalMethod = (ref: GlobalMethodReference, args: Array<unkno
   if (ref.namespace === "Date") return invokeDateStatic(ref.name, args, node)
   if (ref.namespace === "RegExp") return invokeRegExpStatic(ref.name, args, node)
   if (ref.namespace === "Map" || ref.namespace === "Set" || ref.namespace === "URLSearchParams") {
-    throw new InterpreterRuntimeError(`${ref.namespace}.${ref.name} is not available in CodeMode.`, node)
+    throw new InterpreterRuntimeError(`${ref.namespace}.${ref.name} is not available.`, node)
   }
-  throw new InterpreterRuntimeError(`${ref.namespace}.${ref.name} is not available in CodeMode.`, node)
+  throw new InterpreterRuntimeError(`${ref.namespace}.${ref.name} is not available.`, node)
 }
 
 const requireDataArgument = (name: string, index: number, arg: unknown, node: AstNode): unknown => {
@@ -348,7 +347,7 @@ const invokeStringMethod = (value: string, name: string, args: Array<unknown>, n
       break
     }
     default:
-      throw new InterpreterRuntimeError(`String method '${name}' is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`String method '${name}' is not available.`, node)
   }
   return boundedData(result, `String.${name} result`)
 }
@@ -364,7 +363,7 @@ const invokeArrayStatic = (name: string, args: Array<unknown>, node: AstNode): u
     case "from":
       return arrayFromItems(args[0], node)
     default:
-      throw new InterpreterRuntimeError(`Array.${name} is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`Array.${name} is not available.`, node)
   }
 }
 
@@ -449,7 +448,7 @@ export const invokeGroupBy = <R>(
     for (const item of items) {
       const key = yield* coerceGroupByPropertyKey(runner, yield* apply([item, index]), node)
       if (isBlockedMember(key)) {
-        throw new InterpreterRuntimeError(`Property '${key}' is not available in CodeMode.`, node)
+        throw new InterpreterRuntimeError(`Property '${key}' is not available.`, node)
       }
       const group = result[key]
       if (group === undefined) result[key] = [item]
@@ -619,7 +618,7 @@ const invokeMapMethod = <R>(
       })
     }
     default:
-      throw new InterpreterRuntimeError(`Map method '${name}' is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`Map method '${name}' is not available.`, node)
   }
 }
 
@@ -666,7 +665,7 @@ const invokeSetMethod = <R>(
     case "isDisjointFrom":
       return invokeSetOperation(runner, target, name, args[0], node)
     default:
-      throw new InterpreterRuntimeError(`Set method '${name}' is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`Set method '${name}' is not available.`, node)
   }
 }
 
@@ -861,7 +860,7 @@ const invokeURLSearchParamsMethod = <R>(
       })
     }
     default:
-      throw new InterpreterRuntimeError(`URLSearchParams method '${name}' is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`URLSearchParams method '${name}' is not available.`, node)
   }
 }
 
@@ -1104,7 +1103,7 @@ const invokeArrayMethod = <R>(
         }
         return -1
     }
-    throw new InterpreterRuntimeError(`Array method '${name}' is not available in CodeMode.`, node)
+    throw new InterpreterRuntimeError(`Array method '${name}' is not available.`, node)
   })
 }
 
diff --git a/packages/codemode/src/interpreter/model.ts b/packages/codemode/src/interpreter/model.ts
index 72e6de8be7..cc66f3b8a9 100644
--- a/packages/codemode/src/interpreter/model.ts
+++ b/packages/codemode/src/interpreter/model.ts
@@ -166,7 +166,7 @@ export class InterpreterRuntimeError extends Error {
 
 export const unsupportedSyntax = (kind: string, node: AstNode): InterpreterRuntimeError =>
   new InterpreterRuntimeError(
-    `Syntax '${kind}' is not supported in CodeMode. ${supportedSyntaxMessage}`,
+    `Syntax '${kind}' is not supported. ${supportedSyntaxMessage}`,
     node,
     "UnsupportedSyntax",
     [supportedSyntaxMessage],
diff --git a/packages/codemode/src/interpreter/runtime.ts b/packages/codemode/src/interpreter/runtime.ts
index 2c90a4beb0..d290e817b5 100644
--- a/packages/codemode/src/interpreter/runtime.ts
+++ b/packages/codemode/src/interpreter/runtime.ts
@@ -166,7 +166,7 @@ const instanceofValue = (lhs: unknown, rhs: unknown, node: AstNode): boolean =>
     return false
   }
   throw new InterpreterRuntimeError(
-    "The right-hand side of 'instanceof' must be a constructor CodeMode knows: Error (or a specific error type like TypeError), Date, RegExp, Map, Set, URL, URLSearchParams, Array, Object, or Promise.",
+    "The right-hand side of 'instanceof' must be a supported constructor: Error (or a specific error type like TypeError), Date, RegExp, Map, Set, URL, URLSearchParams, Array, Object, or Promise.",
     node,
   )
 }
@@ -393,12 +393,9 @@ export class Interpreter<R> {
 
   private createFunction(node: AstNode): CodeModeFunction {
     if (node.generator === true) {
-      throw new InterpreterRuntimeError(
-        "Generator functions are not supported in CodeMode.",
-        node,
-        "UnsupportedSyntax",
-        [supportedSyntaxMessage],
-      )
+      throw new InterpreterRuntimeError("Generator functions are not supported.", node, "UnsupportedSyntax", [
+        supportedSyntaxMessage,
+      ])
     }
     return new CodeModeFunction(
       getArray(node, "params").map((parameter, index) => asNode(parameter, `params[${index}]`)),
@@ -454,11 +451,7 @@ export class Interpreter<R> {
     return Effect.gen(function* () {
       const discriminant = yield* self.evaluateExpression(getNode(node, "discriminant"))
       if (containsOpaqueReference(discriminant)) {
-        throw new InterpreterRuntimeError(
-          "Switch discriminants must be data values in CodeMode.",
-          node,
-          "InvalidDataValue",
-        )
+        throw new InterpreterRuntimeError("Switch discriminants must be data values.", node, "InvalidDataValue")
       }
       self.scopes.push()
       return yield* Effect.gen(function* () {
@@ -474,11 +467,7 @@ export class Interpreter<R> {
           }
           const candidate = yield* self.evaluateExpression(test)
           if (containsOpaqueReference(candidate)) {
-            throw new InterpreterRuntimeError(
-              "Switch case values must be data values in CodeMode.",
-              test,
-              "InvalidDataValue",
-            )
+            throw new InterpreterRuntimeError("Switch case values must be data values.", test, "InvalidDataValue")
           }
           if (candidate === discriminant) {
             selected = index
@@ -649,7 +638,7 @@ export class Interpreter<R> {
       const iterable = spreadItems(right)
       if (iterable === undefined) {
         throw new InterpreterRuntimeError(
-          `${awaiting ? "for await...of" : "for...of"} requires an array, string, Map, Set, or URLSearchParams value in CodeMode.`,
+          `${awaiting ? "for await...of" : "for...of"} requires an array, string, Map, Set, or URLSearchParams value.`,
           node,
         )
       }
@@ -746,7 +735,7 @@ export class Interpreter<R> {
       const keys = self.enumerableKeys(right)
       if (keys === undefined) {
         throw new InterpreterRuntimeError(
-          "for...in requires a plain object, array, or tools reference in CodeMode. Use for...of for arrays/strings/Maps/Sets, or Object.keys(value) for a key list.",
+          "for...in requires a plain object, array, or tools reference. Use for...of for arrays/strings/Maps/Sets, or Object.keys(value) for a key list.",
           node,
         )
       }
@@ -948,7 +937,7 @@ export class Interpreter<R> {
 
           const key = yield* self.destructuringPropertyKey(property)
           if (isBlockedMember(String(key))) {
-            throw new InterpreterRuntimeError(`Property '${String(key)}' is not available in CodeMode.`, property)
+            throw new InterpreterRuntimeError(`Property '${String(key)}' is not available.`, property)
           }
           consumed.add(String(key))
           yield* self.declarePattern(
@@ -1026,7 +1015,7 @@ export class Interpreter<R> {
           }
           const key = yield* self.destructuringPropertyKey(property)
           if (isBlockedMember(String(key))) {
-            throw new InterpreterRuntimeError(`Property '${String(key)}' is not available in CodeMode.`, property)
+            throw new InterpreterRuntimeError(`Property '${String(key)}' is not available.`, property)
           }
           consumed.add(String(key))
           yield* self.assignPattern(getNode(property, "value"), self.destructuringPropertyValue(source, key), property)
@@ -1202,7 +1191,7 @@ export class Interpreter<R> {
     if (first === null || first === undefined) return {}
     if (typeof first === "object") return first
     throw new InterpreterRuntimeError(
-      `Object(${typeof first}) wrapper objects are not supported in CodeMode; use the primitive value directly.`,
+      `Object(${typeof first}) wrapper objects are not supported; use the primitive value directly.`,
       node,
     )
   }
@@ -1379,7 +1368,7 @@ export class Interpreter<R> {
 
   private applyBinaryOperator(operator: string, lhs: unknown, rhs: unknown, node: AstNode): unknown {
     if (containsOpaqueReference(lhs) || containsOpaqueReference(rhs)) {
-      throw new InterpreterRuntimeError("Binary operators require data values in CodeMode.", node, "InvalidDataValue")
+      throw new InterpreterRuntimeError("Binary operators require data values.", node, "InvalidDataValue")
     }
     // Null-prototype data needs explicit primitive coercion; identity and `in` retain raw objects.
     // Dates use their default string hint for addition and loose equality, and epoch time elsewhere.
@@ -1470,7 +1459,7 @@ export class Interpreter<R> {
       if (operator === "!") return !value
       if (operator === "void") return undefined
       if (containsOpaqueReference(value)) {
-        throw new InterpreterRuntimeError("Unary operators require data values in CodeMode.", node, "InvalidDataValue")
+        throw new InterpreterRuntimeError("Unary operators require data values.", node, "InvalidDataValue")
       }
       const operand =
         value instanceof CodeModeDate
@@ -1585,11 +1574,7 @@ export class Interpreter<R> {
     // the host throw during ToPrimitive, and opaque runtime references must reject clearly.
     const operand = (current: unknown): number => {
       if (containsOpaqueReference(current)) {
-        throw new InterpreterRuntimeError(
-          `'${operator}' requires a data value in CodeMode.`,
-          argument,
-          "InvalidDataValue",
-        )
+        throw new InterpreterRuntimeError(`'${operator}' requires a data value.`, argument, "InvalidDataValue")
       }
       return coerceToNumber(current)
     }
@@ -1712,7 +1697,7 @@ export class Interpreter<R> {
       if (callable === undefined || callable === null) {
         throw new InterpreterRuntimeError(`${calleeDescription(callee)} is not a function.`, callee).as("TypeError")
       }
-      throw new InterpreterRuntimeError("Only tools are callable in CodeMode.", callee)
+      throw new InterpreterRuntimeError("Only tools are callable here.", callee)
     })
   }
 
@@ -1728,8 +1713,7 @@ export class Interpreter<R> {
   }
 
   private invokeConsole(name: string, args: Array<unknown>, node: AstNode): undefined {
-    if (!consoleMethods.has(name))
-      throw new InterpreterRuntimeError(`console.${name} is not available in CodeMode.`, node)
+    if (!consoleMethods.has(name)) throw new InterpreterRuntimeError(`console.${name} is not available.`, node)
     this.logs.push(formatConsoleMessage(name, args))
     return undefined
   }
@@ -1744,10 +1728,7 @@ export class Interpreter<R> {
           const spread = yield* self.evaluateExpression(getNode(argNode, "argument"))
           const items = spreadItems(spread)
           if (items === undefined)
-            throw new InterpreterRuntimeError(
-              "Spread arguments require an array, string, Map, or Set in CodeMode.",
-              argNode,
-            )
+            throw new InterpreterRuntimeError("Spread arguments require an array, string, Map, or Set.", argNode)
           args.push(...items)
         } else {
           args.push(yield* self.evaluateExpression(argNode))
@@ -1813,15 +1794,10 @@ export class Interpreter<R> {
           const spread = yield* self.evaluateExpression(getNode(property, "argument"))
           if (spread === null || spread === undefined || isCodeModeValue(spread)) continue
           if (typeof spread !== "object" || Array.isArray(spread) || isRuntimeReference(spread)) {
-            throw new InterpreterRuntimeError(
-              "Object spread requires a data object in CodeMode.",
-              property,
-              "InvalidDataValue",
-            )
+            throw new InterpreterRuntimeError("Object spread requires a data object.", property, "InvalidDataValue")
           }
           for (const [key, value] of Object.entries(spread)) {
-            if (isBlockedMember(key))
-              throw new InterpreterRuntimeError(`Property '${key}' is not available in CodeMode.`, property)
+            if (isBlockedMember(key)) throw new InterpreterRuntimeError(`Property '${key}' is not available.`, property)
             objectValue[key] = value
           }
           continue
@@ -1852,7 +1828,7 @@ export class Interpreter<R> {
         }
 
         if (isBlockedMember(String(key))) {
-          throw new InterpreterRuntimeError(`Property '${String(key)}' is not available in CodeMode.`, keyNode)
+          throw new InterpreterRuntimeError(`Property '${String(key)}' is not available.`, keyNode)
         }
         objectValue[String(key)] = yield* self.evaluateExpression(valueNode)
       }
@@ -1878,10 +1854,7 @@ export class Interpreter<R> {
           const spread = yield* self.evaluateExpression(getNode(element, "argument"))
           const items = spreadItems(spread)
           if (items === undefined)
-            throw new InterpreterRuntimeError(
-              "Array spread requires an array, string, Map, or Set in CodeMode.",
-              element,
-            )
+            throw new InterpreterRuntimeError("Array spread requires an array, string, Map, or Set.", element)
           values.push(...items)
         } else {
           values.push(yield* self.evaluateExpression(element))
@@ -1977,14 +1950,14 @@ export class Interpreter<R> {
           return new PromiseMethodReference(key as PromiseMethodName)
         }
         throw new InterpreterRuntimeError(
-          `Promise.${String(key)} is not available in CodeMode. Available: Promise.all, Promise.allSettled, Promise.race, Promise.any, Promise.resolve, and Promise.reject; consume promises with await.`,
+          `Promise.${String(key)} is not available. Available: Promise.all, Promise.allSettled, Promise.race, Promise.any, Promise.resolve, and Promise.reject; consume promises with await.`,
           propertyNode,
         )
       }
 
       if (objectValue instanceof GlobalNamespace) {
         if (typeof key === "string" && isBlockedMember(key)) {
-          throw new InterpreterRuntimeError(`${objectValue.name}.${key} is not available in CodeMode.`, propertyNode)
+          throw new InterpreterRuntimeError(`${objectValue.name}.${key} is not available.`, propertyNode)
         }
         if (typeof key !== "string") return new ComputedValue(undefined)
         if (objectValue.name === "Math" && mathConstants.has(key)) {
@@ -2016,7 +1989,7 @@ export class Interpreter<R> {
 
       if (objectValue instanceof CoercionFunction) {
         if (typeof key === "string" && isBlockedMember(key)) {
-          throw new InterpreterRuntimeError(`${objectValue.name}.${key} is not available in CodeMode.`, propertyNode)
+          throw new InterpreterRuntimeError(`${objectValue.name}.${key} is not available.`, propertyNode)
         }
         if (typeof key !== "string") return new ComputedValue(undefined)
         if (objectValue.name === "Number" && numberConstants.has(key)) {
@@ -2083,7 +2056,7 @@ export class Interpreter<R> {
 
       if (isRuntimeReference(objectValue)) {
         throw new InterpreterRuntimeError(
-          "CodeMode runtime references are opaque and do not expose properties.",
+          "Runtime references are opaque and do not expose properties.",
           objectNode,
           "InvalidDataValue",
         )
@@ -2094,7 +2067,7 @@ export class Interpreter<R> {
       }
 
       if (typeof key === "string" && isBlockedMember(key)) {
-        throw new InterpreterRuntimeError(`Property '${key}' is not available in CodeMode.`, propertyNode)
+        throw new InterpreterRuntimeError(`Property '${key}' is not available.`, propertyNode)
       }
 
       if (Array.isArray(objectValue)) {
@@ -2147,7 +2120,7 @@ export class Interpreter<R> {
   private evaluateDeleteExpression(argument: AstNode): Effect.Effect<boolean, unknown, R> {
     const target = argument.type === "ChainExpression" ? getNode(argument, "expression") : argument
     if (target.type !== "MemberExpression") {
-      throw new InterpreterRuntimeError("Only data fields may be deleted in CodeMode.", argument)
+      throw new InterpreterRuntimeError("Only data fields may be deleted.", argument)
     }
     return Effect.map(this.getMemberReference(target, "delete"), (reference) => {
       if (reference === OptionalShortCircuit) return true
@@ -2162,7 +2135,7 @@ export class Interpreter<R> {
         reference instanceof JsonMethodReference ||
         reference.target instanceof CodeModeURL
       ) {
-        throw new InterpreterRuntimeError("Only data fields may be deleted in CodeMode.", target, "InvalidDataValue")
+        throw new InterpreterRuntimeError("Only data fields may be deleted.", target, "InvalidDataValue")
       }
       if (reference.target instanceof CodeModeRegExp) {
         return Reflect.deleteProperty(reference.target.regex, reference.key)
@@ -2190,13 +2163,12 @@ export class Interpreter<R> {
         reference instanceof GlobalMethodReference ||
         reference instanceof JsonMethodReference
       ) {
-        throw new InterpreterRuntimeError("Only data fields may be assigned in CodeMode.", node)
+        throw new InterpreterRuntimeError("Only data fields may be assigned.", node)
       }
       if (Array.isArray(reference.target)) {
-        if (reference.key === "length")
-          throw new InterpreterRuntimeError("Array length cannot be assigned in CodeMode.", node)
+        if (reference.key === "length") throw new InterpreterRuntimeError("Array length cannot be assigned.", node)
         if (typeof reference.key === "string" && arrayMethods.has(reference.key)) {
-          throw new InterpreterRuntimeError("Array methods cannot be assigned in CodeMode.", node)
+          throw new InterpreterRuntimeError("Array methods cannot be assigned.", node)
         }
       }
       const key = Array.isArray(reference.target) ? reference.key : String(reference.key)
diff --git a/packages/codemode/src/stdlib/console.ts b/packages/codemode/src/stdlib/console.ts
index 1b7c3cbdb9..9ecca62c77 100644
--- a/packages/codemode/src/stdlib/console.ts
+++ b/packages/codemode/src/stdlib/console.ts
@@ -58,7 +58,7 @@ const formatConsoleValue = (value: unknown, seen: Set<object>, depth: number): s
       seen.delete(value)
     }
   }
-  if (isRuntimeReference(value)) return "[CodeMode reference]"
+  if (isRuntimeReference(value)) return "[opaque reference]"
   seen.add(value)
   try {
     if (Array.isArray(value)) {
@@ -74,7 +74,7 @@ const formatConsoleValue = (value: unknown, seen: Set<object>, depth: number): s
 
 const formatConsoleTable = (value: unknown, columnsArgument: unknown): string => {
   if (value === undefined) return "undefined"
-  if (containsOpaqueReference(value)) return "[CodeMode reference]"
+  if (containsOpaqueReference(value)) return "[opaque reference]"
   const data = boundedData(value, "console.table argument")
   const columns = consoleTableColumns(columnsArgument)
   const rows = consoleTableRows(data, columns)
diff --git a/packages/codemode/src/stdlib/date.ts b/packages/codemode/src/stdlib/date.ts
index 5cec32bd04..bbae208eca 100644
--- a/packages/codemode/src/stdlib/date.ts
+++ b/packages/codemode/src/stdlib/date.ts
@@ -59,7 +59,7 @@ export const invokeDateStatic = (name: string, args: Array<unknown>, node: AstNo
     case "UTC":
       return Date.UTC(...(args.map((arg) => coerceToNumber(arg)) as Parameters<typeof Date.UTC>))
     default:
-      throw new InterpreterRuntimeError(`Date.${name} is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`Date.${name} is not available.`, node)
   }
 }
 
@@ -170,7 +170,7 @@ export const invokeDateMethod = (
       if (args.length < 3) return updateDate(value, hosted.setUTCFullYear(args[0], args[1]))
       return updateDate(value, hosted.setUTCFullYear(args[0], args[1], args[2]))
     default:
-      throw new InterpreterRuntimeError(`Date method '${name}' is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`Date method '${name}' is not available.`, node)
   }
 }
 
diff --git a/packages/codemode/src/stdlib/math.ts b/packages/codemode/src/stdlib/math.ts
index 235b6083b5..040153b97e 100644
--- a/packages/codemode/src/stdlib/math.ts
+++ b/packages/codemode/src/stdlib/math.ts
@@ -51,7 +51,7 @@ export const mathMethods = new Set([
 ])
 
 export const invokeMathMethod = (name: string, args: Array<unknown>, node: AstNode): number => {
-  if (!mathMethods.has(name)) throw new InterpreterRuntimeError(`Math.${name} is not available in CodeMode.`, node)
+  if (!mathMethods.has(name)) throw new InterpreterRuntimeError(`Math.${name} is not available.`, node)
   if (name === "random") return Math.random()
   if (name === "sumPrecise") {
     const items = spreadItems(args[0])
@@ -151,5 +151,5 @@ export const invokeMathMethod = (name: string, args: Array<unknown>, node: AstNo
     case "imul":
       return Math.imul(a, b())
   }
-  throw new InterpreterRuntimeError(`Math.${name} is not available in CodeMode.`, node)
+  throw new InterpreterRuntimeError(`Math.${name} is not available.`, node)
 }
diff --git a/packages/codemode/src/stdlib/number.ts b/packages/codemode/src/stdlib/number.ts
index 02dfa953b4..8055b046ea 100644
--- a/packages/codemode/src/stdlib/number.ts
+++ b/packages/codemode/src/stdlib/number.ts
@@ -45,7 +45,7 @@ export const invokeNumberMethod = (value: number, name: string, args: Array<unkn
       result = value
       break
     default:
-      throw new InterpreterRuntimeError(`Number method '${name}' is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`Number method '${name}' is not available.`, node)
   }
   return boundedData(result, `Number.${name} result`)
 }
@@ -71,7 +71,7 @@ export const invokeNumberStatic = (name: string, args: Array<unknown>, node: Ast
     case "parseFloat":
       return parseFloat(coerceToString(value))
     default:
-      throw new InterpreterRuntimeError(`Number.${name} is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`Number.${name} is not available.`, node)
   }
 }
 import { type AstNode, InterpreterRuntimeError } from "../interpreter/model.js"
diff --git a/packages/codemode/src/stdlib/object.ts b/packages/codemode/src/stdlib/object.ts
index d2930d81c7..7716ba8115 100644
--- a/packages/codemode/src/stdlib/object.ts
+++ b/packages/codemode/src/stdlib/object.ts
@@ -30,7 +30,7 @@ export const invokeObjectMethod = (name: string, args: Array<unknown>, node: Ast
     return input as Record<string, unknown>
   }
   const guardedSet = (out: Record<string, unknown>, key: string, item: unknown): void => {
-    if (isBlockedMember(key)) throw new InterpreterRuntimeError(`Property '${key}' is not available in CodeMode.`, node)
+    if (isBlockedMember(key)) throw new InterpreterRuntimeError(`Property '${key}' is not available.`, node)
     out[key] = item
   }
   const addEntry = (out: Record<string, unknown>, key: unknown, item: unknown): void => {
@@ -49,7 +49,7 @@ export const invokeObjectMethod = (name: string, args: Array<unknown>, node: Ast
       return Object.hasOwn(requireObject(), String(args[1]))
     case "is":
       if (containsOpaqueReference(args[0]) || containsOpaqueReference(args[1])) {
-        throw new InterpreterRuntimeError("Object.is requires data values in CodeMode.", node, "InvalidDataValue")
+        throw new InterpreterRuntimeError("Object.is requires data values.", node, "InvalidDataValue")
       }
       return Object.is(args[0], args[1])
     case "assign": {
@@ -94,5 +94,5 @@ export const invokeObjectMethod = (name: string, args: Array<unknown>, node: Ast
       return out
     }
   }
-  throw new InterpreterRuntimeError(`Object.${name} is not available in CodeMode.`, node)
+  throw new InterpreterRuntimeError(`Object.${name} is not available.`, node)
 }
diff --git a/packages/codemode/src/stdlib/regexp.ts b/packages/codemode/src/stdlib/regexp.ts
index f737e1b993..c53a38fcd8 100644
--- a/packages/codemode/src/stdlib/regexp.ts
+++ b/packages/codemode/src/stdlib/regexp.ts
@@ -72,7 +72,7 @@ export const matchToValue = (match: RegExpMatchArray): Array<unknown> => {
 }
 
 export const invokeRegExpStatic = (name: string, args: Array<unknown>, node: AstNode): string => {
-  if (name !== "escape") throw new InterpreterRuntimeError(`RegExp.${name} is not available in CodeMode.`, node)
+  if (name !== "escape") throw new InterpreterRuntimeError(`RegExp.${name} is not available.`, node)
   if (typeof args[0] !== "string") {
     throw new InterpreterRuntimeError("RegExp.escape expects a string.", node).as("TypeError")
   }
@@ -104,7 +104,7 @@ export const invokeRegExpMethod = (
     case "toString":
       return coerceToString(value)
     default:
-      throw new InterpreterRuntimeError(`RegExp method '${name}' is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`RegExp method '${name}' is not available.`, node)
   }
 }
 
diff --git a/packages/codemode/src/stdlib/string.ts b/packages/codemode/src/stdlib/string.ts
index ffc33797dd..7070c645a4 100644
--- a/packages/codemode/src/stdlib/string.ts
+++ b/packages/codemode/src/stdlib/string.ts
@@ -43,7 +43,7 @@ export const invokeStringStatic = (name: string, args: Array<unknown>, node: Ast
     case "fromCodePoint":
       return String.fromCodePoint(...codes)
     default:
-      throw new InterpreterRuntimeError(`String.${name} is not available in CodeMode.`, node)
+      throw new InterpreterRuntimeError(`String.${name} is not available.`, node)
   }
 }
 import { type AstNode, InterpreterRuntimeError } from "../interpreter/model.js"
diff --git a/packages/codemode/src/stdlib/url.ts b/packages/codemode/src/stdlib/url.ts
index 39e960539f..dfb203f1f2 100644
--- a/packages/codemode/src/stdlib/url.ts
+++ b/packages/codemode/src/stdlib/url.ts
@@ -69,7 +69,7 @@ export const urlArgument = (value: unknown, label: string): string =>
   value instanceof CodeModeURL ? value.url.href : uriArgument(value, label)
 
 export const invokeURLStatic = (name: string, args: Array<unknown>, node: AstNode): unknown => {
-  if (!urlStatics.has(name)) throw new InterpreterRuntimeError(`URL.${name} is not available in CodeMode.`, node)
+  if (!urlStatics.has(name)) throw new InterpreterRuntimeError(`URL.${name} is not available.`, node)
   if (args.length === 0) throw new InterpreterRuntimeError(`URL.${name} requires a URL argument.`, node).as("TypeError")
   const input = urlArgument(args[0], `URL.${name} input`)
   const base = args[1] === undefined ? undefined : urlArgument(args[1], `URL.${name} base`)
@@ -83,7 +83,7 @@ export const invokeURLStatic = (name: string, args: Array<unknown>, node: AstNod
 
 export const invokeURLMethod = (value: CodeModeURL, name: string, node: AstNode): string => {
   if (name === "toString" || name === "toJSON") return value.url.href
-  throw new InterpreterRuntimeError(`URL method '${name}' is not available in CodeMode.`, node)
+  throw new InterpreterRuntimeError(`URL method '${name}' is not available.`, node)
 }
 import { type AstNode, InterpreterRuntimeError, UriFunction } from "../interpreter/model.js"
 import { CodeModeURL } from "../values.js"
diff --git a/packages/codemode/src/tool-runtime.ts b/packages/codemode/src/tool-runtime.ts
index a518f37cc7..f64858aa35 100644
--- a/packages/codemode/src/tool-runtime.ts
+++ b/packages/codemode/src/tool-runtime.ts
@@ -363,7 +363,7 @@ const termForms = (term: string): Array<string> => {
 
 const makeSearchTool = (searchIndex: ReadonlyArray<SearchEntry>): Definition => ({
   _tag: "CodeModeTool",
-  description: "Search available Code Mode tools",
+  description: "Search available tools",
   input: SearchInput,
   output: SearchOutput,
   run: (input) =>
@@ -501,8 +501,8 @@ export const prepare = <R>(tools: Tools<R>, catalogBudget = defaultCatalogBudget
     empty
       ? "This is a restricted JavaScript language for calling tools, not a general-purpose runtime."
       : complete
-        ? "This is a restricted JavaScript language for calling tools, not a general-purpose runtime. Inside the confined interpreter, `tools` contains the Code Mode tools listed below; surrounding agent tools are not available."
-        : "This is a restricted JavaScript language for calling tools, not a general-purpose runtime. Inside the confined interpreter, `tools` contains the Code Mode tools listed or searchable below; surrounding agent tools are not available.",
+        ? "This is a restricted JavaScript language for calling tools, not a general-purpose runtime. Inside the confined interpreter, `tools` contains the tools listed below; surrounding agent tools are not available."
+        : "This is a restricted JavaScript language for calling tools, not a general-purpose runtime. Inside the confined interpreter, `tools` contains the tools listed or searchable below; surrounding agent tools are not available.",
     ...(empty
       ? []
       : ["Do not infer or normalize tool names; use only exact signatures shown below or returned by search."]),
@@ -533,8 +533,8 @@ export const prepare = <R>(tools: Tools<R>, catalogBudget = defaultCatalogBudget
         "## Rules",
         "",
         complete
-          ? "- Only Code Mode tools listed here are available; surrounding agent tools are not implicitly exposed."
-          : "- Only Code Mode tools listed here or returned by the built-in `search` function are available; surrounding agent tools are not implicitly exposed.",
+          ? "- Only tools listed here are available; surrounding agent tools are not implicitly exposed."
+          : "- Only tools listed here or returned by the built-in `search` function are available; surrounding agent tools are not implicitly exposed.",
         "- Filter, aggregate, and transform collections in code - never return them raw or call a tool per item across messages.",
         "- A result typed `Promise<unknown>` may be structured data or text. Before reading fields, check that it is a non-null object and not an array; otherwise handle the returned text or primitive directly.",
         '- Run independent calls in parallel: `await Promise.all(items.map((item) => tools.<namespace>.<tool>(item)))`, or use `tools.<namespace>["tool-name"](item)` when the listed signature uses bracket notation.',
@@ -553,7 +553,7 @@ export const prepare = <R>(tools: Tools<R>, catalogBudget = defaultCatalogBudget
     "## Language",
     "",
     "Use common JavaScript data operations, functions, control flow, selected standard-library methods, and awaited tool calls. Built-ins include Date, RegExp, Map, Set, URL, URLSearchParams, and URI encoding helpers.",
-    "Modules/imports, classes, generators, timers, fetch, eval, prototype access, and unlisted methods are unavailable. Use Code Mode tools for external operations. Use await with try/catch.",
+    "Modules/imports, classes, generators, timers, fetch, eval, prototype access, and unlisted methods are unavailable. Use tools for external operations. Use await with try/catch.",
     "Prefer explicit `return`; otherwise only the final top-level expression becomes the result.",
     "Dates and URLs serialize to strings at data boundaries; Map/Set/RegExp/URLSearchParams serialize to `{}`.",
   ]
diff --git a/packages/codemode/test/codemode.test.ts b/packages/codemode/test/codemode.test.ts
index e2c91e7f4e..c017a0b971 100644
--- a/packages/codemode/test/codemode.test.ts
+++ b/packages/codemode/test/codemode.test.ts
@@ -308,7 +308,7 @@ describe("CodeMode console capture", () => {
     )
 
     expect(result.ok).toBe(true)
-    expect(result.logs).toStrictEqual(['{"box":Map(1) [["self",[Circular]]]}', '{"fn":[CodeMode reference],"ok":1}'])
+    expect(result.logs).toStrictEqual(['{"box":Map(1) [["self",[Circular]]]}', '{"fn":[opaque reference],"ok":1}'])
   })
 
   test("console.table renders CodeMode value cells", async () => {
@@ -696,7 +696,7 @@ describe("CodeMode public contract", () => {
     expect(instructions).toContain("Do not infer or normalize tool names")
     expect(instructions).toContain("bracket notation and quotes are part of the path")
     expect(instructions).toContain("surrounding agent tools are not available")
-    expect(instructions).toContain("Only Code Mode tools listed here are available")
+    expect(instructions).toContain("Only tools listed here are available")
     // Placeholders use generic namespace/tool/field names only - no fabricated real tools
     // and no real catalog tools cherry-picked into example lines.
     expect(instructions).toContain("`const result = await tools.<namespace>.<tool>(input)`")
@@ -718,7 +718,7 @@ describe("CodeMode public contract", () => {
       '1. If needed, discover tools with the built-in search function: `return search({ query: "<intent + key nouns>" })`.',
     )
     expect(partial).toContain("In the next execution, copy a returned path exactly")
-    expect(partial).toContain("Only Code Mode tools listed here or returned by the built-in `search` function")
+    expect(partial).toContain("Only tools listed here or returned by the built-in `search` function")
     expect(partial).toContain('- Browse one namespace: `search({ query: "", namespace: "<name>" })`.')
     expect(partial).toContain("repeat the same search with `offset: next.offset`")
     expect(partial).toContain("  limit?: number,\n  offset?: number,")
@@ -739,7 +739,7 @@ describe("CodeMode public contract", () => {
     expect(instructions).not.toContain("promise chaining")
     expect(instructions).toContain("URL, URLSearchParams, and URI encoding helpers")
     expect(instructions).not.toContain("host globals")
-    expect(instructions).toContain("Use Code Mode tools for external operations")
+    expect(instructions).toContain("Use tools for external operations")
     expect(instructions).toContain(
       "Prefer explicit `return`; otherwise only the final top-level expression becomes the result.",
     )