diff --git a/packages/flow/docs/API_TIER.md b/packages/flow/docs/API_TIER.md
index 152d04921..bad6d2615 100644
--- a/packages/flow/docs/API_TIER.md
+++ b/packages/flow/docs/API_TIER.md
@@ -1,9 +1,14 @@
 # API steps from a recording's network traffic
 
-A web form save that OpenAdapt can repeat as one HTTP request runs as one
-request instead of as the clicks and keystrokes that filled the form. The
-right-record check before the save and the record check after it stay the
-same. If anything the API step depends on has changed, the recorded GUI
+**Scope: a single HTML form submission.** An API step repeats one
+`application/x-www-form-urlencoded` POST of one HTML form, read again from
+the live page, in place of the clicks and keystrokes that filled it. It is
+not a general API client: JSON or script-built requests, more than one
+write, multi-page server state, and forms whose script validates or rewrites
+values all stay on the GUI.
+
+The right-record check before the save and the record check after it stay
+the same. If anything the API step depends on has changed, the recorded GUI
 steps run instead.
 
 Its speed is measured on the local OpenEMR referral as arm `program_api` of
@@ -40,9 +45,11 @@ openadapt-flow run bundle/ ...
    first of those steps carries `api_fallback` with the reason, and the GUI
    steps run as recorded.
 
-If you change a check on one of the covered steps after compiling (for
-example, you add a required on-screen text), the API step stops running
-because it would skip that check. Run `openadapt-flow api propose bundle/
+If you change any of the covered steps after compiling (an action, a typed
+value or parameter, a target or its identity evidence, a guard, an on-screen
+check, or the save's record check), the API step stops running: its
+admission is bound to a digest of the complete definition of every step it
+replaces, the save included. Run `openadapt-flow api propose bundle/
 --recording rec/` to propose it again, then admit it.
 
 ## What the compiler checks
diff --git a/packages/flow/openadapt_flow/compiler/api_proposal.py b/packages/flow/openadapt_flow/compiler/api_proposal.py
index 622802c85..4ba38dbad 100644
--- a/packages/flow/openadapt_flow/compiler/api_proposal.py
+++ b/packages/flow/openadapt_flow/compiler/api_proposal.py
@@ -613,7 +613,7 @@ def carried(line: dict[str, Any]) -> int:
         replaces_steps=[s.id for s in folded],
         other_writes_seen=others,
         screen_only_checks=screen_only,
-        folded_checks_digest=folded_checks_digest(folded[:-1]),
+        folded_checks_digest=folded_checks_digest(folded),
     )
     binding = ApiBinding(
         kind="web_form",
diff --git a/packages/flow/openadapt_flow/ir.py b/packages/flow/openadapt_flow/ir.py
index 971898c99..61e3a63f5 100644
--- a/packages/flow/openadapt_flow/ir.py
+++ b/packages/flow/openadapt_flow/ir.py
@@ -612,9 +612,12 @@ class WebFormSpec(BaseModel):
     #: On-screen checks of folded steps that caused no request (screen-only,
     #: not repeated), listed for the person admitting the step.
     screen_only_checks: list[str] = Field(default_factory=list)
-    #: Digest of the folded steps' on-screen checks when this was proposed.
-    #: If a check is added or changed later, the API step does not run (it
-    #: would skip that check) until it is proposed again.
+    #: Digest of the complete definition of every replaced step, the save
+    #: included (minus its API binding), when this was proposed
+    #: (``folded_checks_digest`` in runtime.actuators.web_form). Any change to
+    #: those steps keeps the API step from running until it is proposed and
+    #: admitted again. Bindings proposed before it covered more than the
+    #: on-screen checks need proposing again.
     folded_checks_digest: str = Field(pattern=r"^sha256:[0-9a-f]{64}$")
 
 
diff --git a/packages/flow/openadapt_flow/runtime/actuators/web_form.py b/packages/flow/openadapt_flow/runtime/actuators/web_form.py
index 60547a231..74dced3a5 100644
--- a/packages/flow/openadapt_flow/runtime/actuators/web_form.py
+++ b/packages/flow/openadapt_flow/runtime/actuators/web_form.py
@@ -348,11 +348,19 @@ def option_for_label(control: dict[str, Any], label: str) -> Optional[str]:
 
 
 def folded_checks_digest(steps: Any) -> str:
-    """SHA-256 over the on-screen checks (``expect``) of the folded steps."""
+    """SHA-256 over the complete definition of the steps an API step replaces.
+
+    Every replaced step, the save included: its action and values, its
+    parameters, its target and identity evidence, its guards and waits, its
+    on-screen checks, its record check and its risk. Only the save's own API
+    binding is left out (it carries this digest). Any change to what the GUI
+    steps do or check changes the digest, and the API step doesn't run until
+    it is proposed and admitted again.
+    """
 
     import hashlib
 
-    payload = [[s.id, [p.model_dump(mode="json") for p in s.expect]] for s in steps]
+    payload = [s.model_dump(mode="json", exclude={"api_binding"}) for s in steps]
     canonical = json.dumps(payload, sort_keys=True, separators=(",", ":"))
     return "sha256:" + hashlib.sha256(canonical.encode("utf-8")).hexdigest()
 
diff --git a/packages/flow/openadapt_flow/runtime/authorization.py b/packages/flow/openadapt_flow/runtime/authorization.py
index 5748c7b77..2cbd94623 100644
--- a/packages/flow/openadapt_flow/runtime/authorization.py
+++ b/packages/flow/openadapt_flow/runtime/authorization.py
@@ -343,7 +343,7 @@ class AdmittedApiStep(BaseModel):
     """One API step (``web_form`` binding) admitted into a governed run.
 
     Binds the exact binding a person admitted (``admission_digest``), the
-    on-screen checks of the GUI steps it stands for (``folded_checks_digest``)
+    complete definition of the GUI steps it stands for (``folded_checks_digest``)
     and its record check (``effect_contract_hashes``). The runtime runs an API
     step under a governed authorization only when all three still match.
     """
@@ -545,7 +545,7 @@ def admitted_api_step(self, step: Any, workflow: Any) -> Optional[str]:
             row.admission_digest != binding.admission_digest()
             or row.folded_checks_digest != binding.web_form.folded_checks_digest
             or row.folded_checks_digest
-            != folded_checks_digest(workflow.steps[start:end])
+            != folded_checks_digest(workflow.steps[start : end + 1])
             or list(row.effect_contract_hashes)
             != [effect.contract_hash() for effect in step.effects]
         ):
diff --git a/packages/flow/openadapt_flow/runtime/replayer.py b/packages/flow/openadapt_flow/runtime/replayer.py
index f762b353b..f7a51f711 100644
--- a/packages/flow/openadapt_flow/runtime/replayer.py
+++ b/packages/flow/openadapt_flow/runtime/replayer.py
@@ -2523,12 +2523,13 @@ def _web_form_span_at(
             elif ids != list(binding.web_form.replaces_steps):
                 reason = "the program's steps no longer match the API step"
             elif (
-                folded_checks_digest(workflow.steps[step_index:end_index])
+                folded_checks_digest(workflow.steps[step_index : end_index + 1])
                 != binding.web_form.folded_checks_digest
             ):
                 reason = (
-                    "an on-screen check of the GUI steps changed after the API "
-                    "step was proposed, and the API step would skip it "
+                    "the steps the API step replaces changed after it was "
+                    "proposed (an action, value, target, check, guard or record "
+                    "check), so the API step no longer stands for them "
                     "(openadapt-flow api propose)"
                 )
             elif self.governed_authorization is not None and (
diff --git a/packages/flow/tests/test_api_step_durable.py b/packages/flow/tests/test_api_step_durable.py
index 82b80900d..322c1c090 100644
--- a/packages/flow/tests/test_api_step_durable.py
+++ b/packages/flow/tests/test_api_step_durable.py
@@ -79,6 +79,28 @@ def actuate(self, binding, params):
         )
 
 
+def _reproposed(wf: Workflow) -> Workflow:
+    """The span program after an edit to its steps, its API step proposed again.
+
+    The API step's admission binds the complete definition of the steps it
+    replaces, so an edited save needs the binding's digest recomputed, as
+    ``openadapt-flow api propose`` does, before it is admitted again.
+    """
+
+    from openadapt_flow.runtime.actuators.web_form import folded_checks_digest
+
+    save = wf.steps[-1]
+    spec = save.api_binding.web_form.model_copy(
+        update={"folded_checks_digest": folded_checks_digest(wf.steps)}
+    )
+    binding = save.api_binding.model_copy(update={"web_form": spec})
+    return wf.model_copy(
+        update={
+            "steps": [*wf.steps[:-1], save.model_copy(update={"api_binding": binding})]
+        }
+    )
+
+
 def _absolute_check_workflow() -> Workflow:
     """The span program with a record check that needs no before-snapshot.
 
@@ -91,7 +113,7 @@ def _absolute_check_workflow() -> Workflow:
     effect = save.effects[0].model_copy(update={"forbid_collateral_loss": False})
     binding = save.api_binding.model_copy(update={"effects": [effect]})
     save = save.model_copy(update={"effects": [effect], "api_binding": binding})
-    wf = wf.model_copy(update={"steps": [*wf.steps[:-1], save]})
+    wf = _reproposed(wf.model_copy(update={"steps": [*wf.steps[:-1], save]}))
     wf, _ = admit_api_step(wf, admitted_by="reviewer")
     return wf
 
@@ -330,7 +352,7 @@ def test_an_identity_checked_save_with_a_right_record_contract_runs_durably(tmp_
         update={"steps": [*wf.steps[:-1], save], "params": {**wf.params, "note": "api"}}
     )
     wf, _ = admit_api_step(
-        wf, admitted_by="reviewer", identity={"subject_name": "note"}
+        _reproposed(wf), admitted_by="reviewer", identity={"subject_name": "note"}
     )
     fx = Fixture(tmp_path, wf)
     try:
diff --git a/packages/flow/tests/test_api_step_governed.py b/packages/flow/tests/test_api_step_governed.py
index d26917e7b..2aeb259eb 100644
--- a/packages/flow/tests/test_api_step_governed.py
+++ b/packages/flow/tests/test_api_step_governed.py
@@ -96,7 +96,7 @@ def _workflow(*, admitted: bool = True, identity: bool = True) -> Workflow:
         ],
         controls=["csrf", "lname"],
         replaces_steps=[typing.id, submit.id],
-        folded_checks_digest=folded_checks_digest([typing]),
+        folded_checks_digest=folded_checks_digest([typing, submit]),
     )
     submit = submit.model_copy(
         update={
diff --git a/packages/flow/tests/test_api_step_replaced_steps_digest.py b/packages/flow/tests/test_api_step_replaced_steps_digest.py
new file mode 100644
index 000000000..b80ac338e
--- /dev/null
+++ b/packages/flow/tests/test_api_step_replaced_steps_digest.py
@@ -0,0 +1,70 @@
+"""An API step stands for the exact steps it was admitted for.
+
+The reviewer's case for #1269: folded_checks_digest hashed only the folded
+steps' on-screen checks, so changing what a replaced step does (its action,
+its value, its parameter, its target or identity, a guard, the save's record
+check) left the admitted API step running in its place.
+"""
+
+from __future__ import annotations
+
+import pytest
+
+from openadapt_flow.ir import ActionKind, Anchor, Guard, Predicate, PredicateKind
+from openadapt_flow.runtime.replayer import Replayer
+from tests.test_api_tier_web_form import _span_workflow
+from tests.test_replayer import FakeBackend, FakeVision
+
+
+def _edit(wf, index, **update):
+    steps = list(wf.steps)
+    steps[index] = steps[index].model_copy(update=update)
+    return wf.model_copy(update={"steps": steps})
+
+
+def _why(wf):
+    replayer = Replayer(FakeBackend(), vision=FakeVision(), web_form_actuator=object())
+    _end, _save, why = replayer._web_form_span_at(wf, 0, durable=False)
+    return why
+
+
+def test_the_admitted_steps_run_as_the_api_step():
+    assert _why(_span_workflow()) is None
+
+
+@pytest.mark.parametrize(
+    "index, update",
+    [
+        (0, {"action": ActionKind.CLICK, "key": None}),
+        (0, {"key": "Shift+Tab"}),
+        (0, {"text": "{lname}", "action": ActionKind.TYPE, "key": None}),
+        (0, {"param": "lname"}),
+        (
+            0,
+            {
+                "anchor": Anchor(
+                    template="templates/x.png",
+                    region=(0, 0, 10, 10),
+                    click_point=(5, 5),
+                    context_text="Another record",
+                )
+            },
+        ),
+        (
+            0,
+            {
+                "guard": Guard(
+                    predicate=Predicate(
+                        kind=PredicateKind.PARAM_EQUALS, param="lname", value="x"
+                    ),
+                    on_unmet="halt",
+                )
+            },
+        ),
+        (1, {"key": "Ctrl+Enter"}),
+        (1, {"risk": "irreversible"}),
+    ],
+)
+def test_any_change_to_a_replaced_step_keeps_it_on_the_gui(index, update):
+    why = _why(_edit(_span_workflow(), index, **update))
+    assert why is not None and "replaces changed" in why
diff --git a/packages/flow/tests/test_api_tier_web_form.py b/packages/flow/tests/test_api_tier_web_form.py
index c632a4c5b..c45f0f664 100644
--- a/packages/flow/tests/test_api_tier_web_form.py
+++ b/packages/flow/tests/test_api_tier_web_form.py
@@ -561,7 +561,7 @@ def _span_workflow(*, admitted=True) -> Workflow:
             WebFormPrecheck(path="/dup.php", require_text=["No matches were found."])
         ],
         replaces_steps=["step_000", "step_001"],
-        folded_checks_digest=folded_checks_digest(steps[:1]),
+        folded_checks_digest=folded_checks_digest(steps),
     )
     binding = ApiBinding(
         kind="web_form", url_template="/save.php", effects=[effect], web_form=spec
@@ -666,7 +666,7 @@ def test_a_rejected_save_halts_without_gui_retry(tmp_path):
                 }
             ),
             {},
-            "on-screen check",
+            "replaces changed",
         ),
     ],
 )