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diff --git a/stdlib/core_wip.slul b/stdlib/core_wip.slul
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+#
+# Interface definitions for the core runtime library (work in progress!)
+#
+# Copyright © 2025 Samuel Lidén Borell <samuel@kodafritt.se>
+#
+# SPDX-License-Identifier: EUPL-1.2+ OR LGPL-2.1-or-later
+#
+
+
+# XXX should there be different kinds of classes for service types and givemes?
+
+# XXX this structure makes nested (normal) classes impossible.
+#     alternatives to normal nesting of classes:
+#     - `nested class NC`
+#     - `nested NC`
+#     - `class NC = int x, bool b`
+#     - different behavior in class-files
+#     - `tuple NC = int x, bool b`
+#     - `local class NC`  (i.e. don't allow nested classes to be visible
+#       to other files)
+#     - inline tuples
+#        - but it might lead to lots of repetition
+#        - and then they cannot have methods
+#        - unless you allow `func (int,bool).somefunc`
+
+# XXX this creates a difference between func and class
+#      - no `end` for `class`
+#      - but `end` required for `func`
+
+# XXX what if this file gets really large?
+#    - add a way to split it?
+#    - add a way to split modules? (better?)
+#    - make it more compact? is that a good idea? (documentation comments etc.)
+# XXX api hashes (manual or automatic?)
+
+
+###########################################################################
+
+
+class CommandMain
+# Service interface for the main CLI command of an application
+
+
+###########################################################################
+
+
+class String
+# String of (possibly invalid!) UTF-8 bytes. Fully binary-safe, can contain
+# non-UTF-8 bytes as well as null bytes.
+
+
+###########################################################################
+
+
+class MessageReporter
+# A class that can be injected as a `giveme` to provide basic message
+# (error/warning/info) reporting
+#
+# TODO stdout vs stderr
+
+func begin_message
+# Starts a new message. Nothing is actually written until `report` is called.
+    String format
+    # TODO
+end
+
+func add_int
+# Adds a number as the next format parameter value.
+    int number
+end
+
+func report
+# Finishes a message, and outputs/reports it.
+end
+
+
+###########################################################################
+
+
+class Writer
+# Writes strings to some location. Can be injected as a `giveme` to get
+# access to `stdout` or `stderr`.
+
+func write_str
+# Writes a string to the output.
+    String s
+    # String to write. If the output supports binary, then it may contain
+    # binary (and invalid UTF-8). Otherwise, it should be valid UTF-8.
+    # (Encoding errors could perhaps be handled like I/O errors?)
+end