0.15.0 --- the interfaces this implementation provides are stated, and the statement is the artefact's own answer

.github/workflows/ci.yml

@@ -221,6 +221,29 @@ jobs:
           bash .spec/tools/check-surface.sh --complete .spec/SURFACE.txt \
             $(find target -path '*/obj/*' -name '*.o' ! -name '*.m.o' ! -name 'conformance*' | tr '\n' ' ')
 
+      - name: The manifest's provides-interfaces is what the artefact provides
+        run: |
+          set -euo pipefail
+          # The array in mcpp.toml is a declaration, and a declaration is
+          # checked rather than trusted. The check is clause 9's surface
+          # comparison stopped one step earlier: the walk that decides whether
+          # each group is exported whole already answers which interfaces this
+          # implementation provides. Regenerating and diffing is therefore not
+          # a second derivation --- it is the same one.
+          objs=$(find target -path '*/obj/*' -name '*.o' ! -name '*.m.o' ! -name 'conformance*' | tr '\n' ' ')
+          [ -n "$objs" ] || { echo "::error::no objects to examine"; exit 1; }
+          bash .spec/tools/check-surface.sh --toml .spec/SURFACE.txt $objs > /tmp/derived.toml
+          # The manifest's own block, normalised the same way: the array body
+          # between `provides-interfaces = [` and the closing bracket.
+          awk '/^provides-interfaces = \[/{p=1} p{print} /^\]/{if(p)exit}' mcpp.toml > /tmp/declared.toml
+          if ! diff -u /tmp/declared.toml /tmp/derived.toml; then
+            echo "::error::mcpp.toml's provides-interfaces disagrees with the artefact"
+            echo "  regenerate it with:"
+            echo "    bash .spec/tools/check-surface.sh --toml .spec/SURFACE.txt \$(find target -name '*.o')"
+            exit 1
+          fi
+          echo "  ok  the declaration is the artefact's own answer"
+
       - name: The C++ declarations are complete
         run: |
           # The specification's own tool examines the C form. The module form is

mcpp.toml

@@ -1,7 +1,7 @@
 [package]
 namespace   = "mcpplibs"
 name        = "openkal-linux"
-version     = "0.14.0"
+version     = "0.15.0"
 description = "The reference implementation of openkal for Linux, written on the kernel's own system-call interface so that it can be placed beneath a C library as well as above one."
 license     = "Apache-2.0"
 
@@ -17,6 +17,51 @@ provides    = ["mcpp:kernel-abi=openkal"]
 authors     = ["mcpplibs"]
 repo        = "https://github.com/mcpplibs/openkal-linux"
 
+# WHICH INTERFACES THIS IMPLEMENTATION PROVIDES, DERIVED FROM THE ARTEFACT AND
+# NOT WRITTEN BY HAND.
+#
+# openkal's specification names no set of interfaces: clause 3.3 withdrew the
+# one it had named (`hosted`) because a name describing a class of environment
+# is falsified by an environment nobody had in mind, and that one was falsified
+# inside its own ecosystem within a release. Enumeration by the package
+# replaced it, and a build tool reads this array at dependency resolution
+# against the `requires-interfaces` a consumer states in its own manifest --
+# the first of the three times clause 6.2 tabulates, and the earliest at which
+# the question can be answered.
+#
+# GENERATED, AND CI DIFFS IT AGAINST THE OBJECTS:
+#
+#     bash openkal/tools/check-surface.sh --toml openkal/SURFACE.txt \
+#          $(find target -name '*.o')
+#
+# A declaration derived from the thing it describes cannot disagree with it,
+# and an implementation that gains an interface cannot forget to say so. The
+# same walk is clause 9's surface comparison stopped one step earlier, so this
+# list and that check can never answer differently.
+#
+# BACKWARD COMPATIBLE. An engine that predates the key reads `[kernel-abi]` as
+# an unknown top-level table and ignores it, so this manifest loads unchanged
+# everywhere it loaded before; the absence of the check is the behaviour that
+# release already had.
+[kernel-abi]
+provides-interfaces = [
+    "openkal.abort",
+    "openkal.stream",
+    "openkal.memory",
+    "openkal.env",
+    "openkal.time",
+    "openkal.random",
+    "openkal.fs",
+    "openkal.process",
+    "openkal.task",
+    "openkal.exec",
+    "openkal.terminal",
+    "openkal.net",
+    "openkal.datagram",
+    "openkal.space",
+    "openkal.timeout",
+]
+
 [dependencies]
 openkal = "0.14.0"