diff --git a/crates/mq-lang/modules/module_tests.mq b/crates/mq-lang/modules/module_tests.mq
index a02b4c2e7..2b11b586e 100644
--- a/crates/mq-lang/modules/module_tests.mq
+++ b/crates/mq-lang/modules/module_tests.mq
@@ -128,8 +128,9 @@ def test_toml_parse():
 end
 
 def test_toml_to_json():
-  let result = toml::toml_to_json(toml::toml_parse(toml_input))
-  | assert_eq(result, "{\"dependencies\":{},\"package\":{\"name\":\"test-package\",\"authors\":[\"Test Author <test@example.com>\"],\"description\":\"A test TOML configuration file\",\"edition\":\"2021\",\"license\":\"MIT\",\"version\":\"1.0.0\"}}")
+  let parsed = toml::toml_parse(toml_input)
+  | let result = toml::toml_to_json(parsed)
+  | assert_eq(json::json_parse(result), parsed)
 end
 
 # -- YAML Tests --
@@ -731,6 +732,48 @@ def test_semver_min():
   | assert_eq(semver::semver_to_string(min), "1.0.0")
 end
 
+def test_semver_satisfies_range_true():
+  assert_true(semver::semver_satisfies("1.5.0", ">=1.0.0,<2.0.0"))
+end
+
+def test_semver_satisfies_range_false():
+  assert_false(semver::semver_satisfies("2.0.0", ">=1.0.0,<2.0.0"))
+end
+
+def test_semver_satisfies_range_lower_bound_inclusive():
+  assert_true(semver::semver_satisfies("1.0.0", ">=1.0.0,<2.0.0"))
+end
+
+def test_semver_satisfies_exact_match():
+  assert_true(semver::semver_satisfies("1.2.3", "1.2.3"))
+  | assert_false(semver::semver_satisfies("1.2.4", "1.2.3"))
+end
+
+def test_semver_satisfies_eq_operator():
+  assert_true(semver::semver_satisfies("1.2.3", "=1.2.3"))
+  | assert_true(semver::semver_satisfies("1.2.3", "==1.2.3"))
+end
+
+def test_semver_satisfies_not_equal():
+  assert_true(semver::semver_satisfies("1.2.4", "!=1.2.3"))
+  | assert_false(semver::semver_satisfies("1.2.3", "!=1.2.3"))
+end
+
+def test_semver_satisfies_gt_lt():
+  assert_true(semver::semver_satisfies("1.5.0", ">1.0.0"))
+  | assert_false(semver::semver_satisfies("1.0.0", ">1.0.0"))
+  | assert_true(semver::semver_satisfies("1.0.0", "<2.0.0"))
+  | assert_false(semver::semver_satisfies("2.0.0", "<2.0.0"))
+end
+
+def test_semver_satisfies_ignores_whitespace():
+  assert_true(semver::semver_satisfies("1.5.0", " >= 1.0.0 , < 2.0.0 "))
+end
+
+def test_semver_satisfies_with_prerelease():
+  assert_true(semver::semver_satisfies("1.0.0-alpha", "<1.0.0"))
+end
+
 # -- Markdown Builder (md) Tests --
 
 def test_md_h():
diff --git a/crates/mq-lang/modules/semver.mq b/crates/mq-lang/modules/semver.mq
index cbbbacaa6..422c92d2c 100644
--- a/crates/mq-lang/modules/semver.mq
+++ b/crates/mq-lang/modules/semver.mq
@@ -173,3 +173,45 @@ end
 def semver_min(versions):
   fold(versions[1:len(versions)], versions[0], fn(acc, v): if (semver_lt(v, acc)): v else: acc;)
 end
+
+# Parses a single version comparator (e.g. ">=1.0.0") into a dict with op and parsed version fields.
+def _semver_parse_comparator(comp):
+  let c = trim(comp)
+  | if (starts_with(c, ">=")):
+      {op: ">=", version: semver_parse(trim(ltrimstr(c, ">=")))}
+    elif (starts_with(c, "<=")):
+      {op: "<=", version: semver_parse(trim(ltrimstr(c, "<=")))}
+    elif (starts_with(c, "==")):
+      {op: "=", version: semver_parse(trim(ltrimstr(c, "==")))}
+    elif (starts_with(c, "!=")):
+      {op: "!=", version: semver_parse(trim(ltrimstr(c, "!=")))}
+    elif (starts_with(c, ">")):
+      {op: ">", version: semver_parse(trim(ltrimstr(c, ">")))}
+    elif (starts_with(c, "<")):
+      {op: "<", version: semver_parse(trim(ltrimstr(c, "<")))}
+    elif (starts_with(c, "=")):
+      {op: "=", version: semver_parse(trim(ltrimstr(c, "=")))}
+    else:
+      {op: "=", version: semver_parse(c)}
+end
+
+# Checks whether a parsed SemVer dict satisfies a single comparator dict produced by `_semver_parse_comparator`.
+def _semver_satisfies_comparator(v, cmp):
+  let op = cmp[:op]
+  | let cv = cmp[:version]
+  | if (op == ">="): semver_gte(v, cv)
+    elif (op == "<="): semver_lte(v, cv)
+    elif (op == ">"): semver_gt(v, cv)
+    elif (op == "<"): semver_lt(v, cv)
+    elif (op == "!="): !semver_eq(v, cv)
+    else: semver_eq(v, cv)
+end
+
+# Returns true if the given version string satisfies every comma-separated comparator in `range`.
+# Supported comparators: "=", "==", "!=", ">", ">=", "<", "<=". A bare version (no operator) requires an exact match.
+# Example: semver_satisfies("1.5.0", ">=1.0.0,<2.0.0") == true
+def semver_satisfies(version, range):
+  let v = semver_parse(version)
+  | let comparators = map(split(range, ","), _semver_parse_comparator)
+  | all(comparators, fn(cmp): _semver_satisfies_comparator(v, cmp);)
+end