diff --git a/docs/eve-migration-roadmap.md b/docs/eve-migration-roadmap.md
index 966fbfa..a4f0165 100644
--- a/docs/eve-migration-roadmap.md
+++ b/docs/eve-migration-roadmap.md
@@ -280,6 +280,13 @@ Exit criteria:
 
 Recently cut:
 
+- Plugin manifests and advertisements now carry a runtime-independent sidecar
+  ABI boundary. Sai, Norn, and TeX declare `invocationModel:
+  executable-sidecar`, `gamecult.eve.plugin_abi.v1`, CultMesh/stdio transports,
+  renderer independence, no provider-state mutation, and provider-owned command
+  acceptance. The parity harness validates manifest/advertisement agreement,
+  exports the runtime boundary, and the plugin-owner consumer smoke asserts the
+  Sai/Norn sidecar contract from the conformance pack.
 - Conformance export now carries first-class `capabilityGaps[]` records derived
   from plugin errors, provider advertisement/scenario errors, runtime missing
   evidence, declared unsupported plugin projection, capture gaps, and split
diff --git a/docs/parity-testing-harness.md b/docs/parity-testing-harness.md
index 4097208..37fab6d 100644
--- a/docs/parity-testing-harness.md
+++ b/docs/parity-testing-harness.md
@@ -156,8 +156,12 @@ powershell -ExecutionPolicy Bypass -File .\scripts\run-plugin-handoff-smoke.ps1
 
 That script validates the Sai and Norn handoff manifests against their plugin
 manifests, advertisements, ABI fixtures, move-set paths, contract inputs, and
-external proofs. The plugin-owner conformance smoke also asserts those handoff
-paths from the conformance export.
+external proofs. It also checks that the manifest and advertisement agree on
+the runtime-independent executable sidecar boundary: `gamecult.eve.plugin_abi.v1`,
+CultMesh/stdio transport, renderer independence, no provider-state mutation,
+and provider-owned command acceptance. The plugin-owner conformance smoke also
+asserts those handoff paths and runtime boundary claims from the conformance
+export.
 
 Aetheria provider handoff smoke:
 
diff --git a/docs/plugin-architecture.md b/docs/plugin-architecture.md
index 2773d1e..d2578fa 100644
--- a/docs/plugin-architecture.md
+++ b/docs/plugin-architecture.md
@@ -114,6 +114,14 @@ not by importing plugin internals directly. A plugin implementation may use a
 same-language library internally, but that is an implementation detail behind
 the executable plugin boundary.
 
+Plugin manifests and advertisements declare a `runtime` block. Its normal
+incubating shape is `invocationModel: executable-sidecar`,
+`contract: gamecult.eve.plugin_abi.v1`, CultMesh plus stdio transports, and
+authority limits such as `renderer-independent`, `no-provider-state-mutation`,
+and `provider-accepts-or-denies-commands`. Runtimes consume that advertisement
+as a capability boundary. A Unity or web projection adapter may render an
+advertised capability; it does not become the plugin runtime.
+
 The ownership rule is semantic, not packaging ceremony: the plugin owns the
 capability and representation shape, while providers own live state and
 renderer clients own projection.
diff --git a/plugins/incubating/norn-graph.plugin-advertisement.json b/plugins/incubating/norn-graph.plugin-advertisement.json
index 029fa1f..06f37be 100644
--- a/plugins/incubating/norn-graph.plugin-advertisement.json
+++ b/plugins/incubating/norn-graph.plugin-advertisement.json
@@ -4,6 +4,16 @@
   "ownerService": "norn",
   "version": "0.1.0-incubating",
   "manifestAddress": "file://plugins/incubating/norn-graph.plugin.json",
+  "runtime": {
+    "invocationModel": "executable-sidecar",
+    "contract": "gamecult.eve.plugin_abi.v1",
+    "transports": ["cultmesh", "stdio"],
+    "authority": [
+      "renderer-independent",
+      "no-provider-state-mutation",
+      "provider-accepts-or-denies-commands"
+    ]
+  },
   "schemas": [
     "norn.graph.document.v1",
     "norn.graph.layout_request.v1",
diff --git a/plugins/incubating/norn-graph.plugin.json b/plugins/incubating/norn-graph.plugin.json
index 4ded2e3..5634895 100644
--- a/plugins/incubating/norn-graph.plugin.json
+++ b/plugins/incubating/norn-graph.plugin.json
@@ -24,6 +24,16 @@
       "effect": "focus-graph"
     }
   ],
+  "runtime": {
+    "invocationModel": "executable-sidecar",
+    "contract": "gamecult.eve.plugin_abi.v1",
+    "transports": ["cultmesh", "stdio"],
+    "authority": [
+      "renderer-independent",
+      "no-provider-state-mutation",
+      "provider-accepts-or-denies-commands"
+    ]
+  },
   "stateSchemas": [
     "norn.graph.document.v1",
     "norn.graph.layout_request.v1",
diff --git a/plugins/incubating/sai-vn.plugin-advertisement.json b/plugins/incubating/sai-vn.plugin-advertisement.json
index 95e35df..17c7b1d 100644
--- a/plugins/incubating/sai-vn.plugin-advertisement.json
+++ b/plugins/incubating/sai-vn.plugin-advertisement.json
@@ -4,6 +4,16 @@
   "ownerService": "sai",
   "version": "0.1.0-incubating",
   "manifestAddress": "file://plugins/incubating/sai-vn.plugin.json",
+  "runtime": {
+    "invocationModel": "executable-sidecar",
+    "contract": "gamecult.eve.plugin_abi.v1",
+    "transports": ["cultmesh", "stdio"],
+    "authority": [
+      "renderer-independent",
+      "no-provider-state-mutation",
+      "provider-accepts-or-denies-commands"
+    ]
+  },
   "schemas": [
     "sai.vn.story_session.v1",
     "sai.vn.visual_manifest.v1"
diff --git a/plugins/incubating/sai-vn.plugin.json b/plugins/incubating/sai-vn.plugin.json
index 9a75c6e..1c21516 100644
--- a/plugins/incubating/sai-vn.plugin.json
+++ b/plugins/incubating/sai-vn.plugin.json
@@ -32,6 +32,16 @@
       "effect": "jump-to-knot"
     }
   ],
+  "runtime": {
+    "invocationModel": "executable-sidecar",
+    "contract": "gamecult.eve.plugin_abi.v1",
+    "transports": ["cultmesh", "stdio"],
+    "authority": [
+      "renderer-independent",
+      "no-provider-state-mutation",
+      "provider-accepts-or-denies-commands"
+    ]
+  },
   "stateSchemas": [
     "sai.vn.story_session.v1",
     "sai.vn.visual_manifest.v1"
diff --git a/plugins/incubating/tex-math.plugin-advertisement.json b/plugins/incubating/tex-math.plugin-advertisement.json
index 0c8ca4e..a540864 100644
--- a/plugins/incubating/tex-math.plugin-advertisement.json
+++ b/plugins/incubating/tex-math.plugin-advertisement.json
@@ -4,6 +4,16 @@
   "ownerService": "eveplugins",
   "version": "0.1.0-incubating",
   "manifestAddress": "file://plugins/incubating/tex-math.plugin.json",
+  "runtime": {
+    "invocationModel": "executable-sidecar",
+    "contract": "gamecult.eve.plugin_abi.v1",
+    "transports": ["cultmesh", "stdio"],
+    "authority": [
+      "renderer-independent",
+      "no-provider-state-mutation",
+      "provider-accepts-or-denies-commands"
+    ]
+  },
   "schemas": [
     "tex.math.source.v1",
     "tex.math.render_request.v1",
diff --git a/plugins/incubating/tex-math.plugin.json b/plugins/incubating/tex-math.plugin.json
index 6c6fe3b..6a60eb5 100644
--- a/plugins/incubating/tex-math.plugin.json
+++ b/plugins/incubating/tex-math.plugin.json
@@ -13,6 +13,16 @@
     "embed.tex"
   ],
   "commands": [],
+  "runtime": {
+    "invocationModel": "executable-sidecar",
+    "contract": "gamecult.eve.plugin_abi.v1",
+    "transports": ["cultmesh", "stdio"],
+    "authority": [
+      "renderer-independent",
+      "no-provider-state-mutation",
+      "provider-accepts-or-denies-commands"
+    ]
+  },
   "stateSchemas": [
     "tex.math.source.v1",
     "tex.math.render_request.v1",
diff --git a/schemas/gamecult.eve.plugin.v1.schema.json b/schemas/gamecult.eve.plugin.v1.schema.json
index 6e4d51d..00706e4 100644
--- a/schemas/gamecult.eve.plugin.v1.schema.json
+++ b/schemas/gamecult.eve.plugin.v1.schema.json
@@ -11,6 +11,7 @@
     "incubation",
     "componentKinds",
     "commands",
+    "runtime",
     "stateSchemas",
     "fixtures",
     "capabilities"
@@ -92,6 +93,40 @@
         "additionalProperties": true
       }
     },
+    "runtime": {
+      "type": "object",
+      "required": [
+        "invocationModel",
+        "contract",
+        "transports",
+        "authority"
+      ],
+      "properties": {
+        "invocationModel": {
+          "type": "string",
+          "minLength": 1
+        },
+        "contract": {
+          "type": "string",
+          "minLength": 1
+        },
+        "transports": {
+          "type": "array",
+          "items": {
+            "type": "string",
+            "minLength": 1
+          }
+        },
+        "authority": {
+          "type": "array",
+          "items": {
+            "type": "string",
+            "minLength": 1
+          }
+        }
+      },
+      "additionalProperties": true
+    },
     "stateSchemas": {
       "type": "array",
       "items": {
diff --git a/schemas/gamecult.eve.plugin_advertisement.v1.schema.json b/schemas/gamecult.eve.plugin_advertisement.v1.schema.json
index 3a054d5..e44f987 100644
--- a/schemas/gamecult.eve.plugin_advertisement.v1.schema.json
+++ b/schemas/gamecult.eve.plugin_advertisement.v1.schema.json
@@ -9,6 +9,7 @@
     "ownerService",
     "version",
     "manifestAddress",
+    "runtime",
     "schemas",
     "componentKinds",
     "commands",
@@ -34,6 +35,40 @@
       "type": "string",
       "minLength": 1
     },
+    "runtime": {
+      "type": "object",
+      "required": [
+        "invocationModel",
+        "contract",
+        "transports",
+        "authority"
+      ],
+      "properties": {
+        "invocationModel": {
+          "type": "string",
+          "minLength": 1
+        },
+        "contract": {
+          "type": "string",
+          "minLength": 1
+        },
+        "transports": {
+          "type": "array",
+          "items": {
+            "type": "string",
+            "minLength": 1
+          }
+        },
+        "authority": {
+          "type": "array",
+          "items": {
+            "type": "string",
+            "minLength": 1
+          }
+        }
+      },
+      "additionalProperties": true
+    },
     "schemas": {
       "type": "array",
       "items": {
diff --git a/scripts/run-plugin-handoff-smoke.ps1 b/scripts/run-plugin-handoff-smoke.ps1
index 79f7c5a..3e67bed 100644
--- a/scripts/run-plugin-handoff-smoke.ps1
+++ b/scripts/run-plugin-handoff-smoke.ps1
@@ -65,6 +65,31 @@ foreach ($handoffPath in $HandoffPaths) {
   if ($manifest.incubation.splitTarget -ne $handoff.splitTarget) {
     throw "Plugin handoff $($handoff.pluginId) split target does not match manifest: $($manifest.incubation.splitTarget)"
   }
+  if ($manifest.runtime.invocationModel -ne "executable-sidecar") {
+    throw "Plugin handoff $($handoff.pluginId) runtime is not executable-sidecar: $($manifest.runtime.invocationModel)"
+  }
+  if ($manifest.runtime.contract -ne "gamecult.eve.plugin_abi.v1") {
+    throw "Plugin handoff $($handoff.pluginId) runtime contract is not gamecult.eve.plugin_abi.v1: $($manifest.runtime.contract)"
+  }
+  if ($advertisement.runtime.invocationModel -ne $manifest.runtime.invocationModel) {
+    throw "Plugin handoff $($handoff.pluginId) advertisement runtime does not match manifest runtime: $($advertisement.runtime.invocationModel)"
+  }
+  foreach ($transport in @("cultmesh", "stdio")) {
+    if (-not (@($manifest.runtime.transports) -contains $transport)) {
+      throw "Plugin handoff $($handoff.pluginId) manifest runtime missing transport: $transport"
+    }
+    if (-not (@($advertisement.runtime.transports) -contains $transport)) {
+      throw "Plugin handoff $($handoff.pluginId) advertisement runtime missing transport: $transport"
+    }
+  }
+  foreach ($authority in @("renderer-independent", "no-provider-state-mutation", "provider-accepts-or-denies-commands")) {
+    if (-not (@($manifest.runtime.authority) -contains $authority)) {
+      throw "Plugin handoff $($handoff.pluginId) manifest runtime missing authority: $authority"
+    }
+    if (-not (@($advertisement.runtime.authority) -contains $authority)) {
+      throw "Plugin handoff $($handoff.pluginId) advertisement runtime missing authority: $authority"
+    }
+  }
 
   $operations = @($abiFixture.operations | ForEach-Object { $_.operation })
   foreach ($operation in @("describe", "validate", "project", "lower", "measure", "apply")) {
diff --git a/scripts/run-plugin-owner-conformance-consumer-smoke.ps1 b/scripts/run-plugin-owner-conformance-consumer-smoke.ps1
index 7318518..3456a16 100644
--- a/scripts/run-plugin-owner-conformance-consumer-smoke.ps1
+++ b/scripts/run-plugin-owner-conformance-consumer-smoke.ps1
@@ -54,7 +54,13 @@ node $consumerScript $consumerExport `
   --expect-plugin-capability sai.vn:story.continue `
   --expect-plugin-capability sai.vn:story.jump `
   --expect-plugin-capability norn.graph:embed.norn `
-  --expect-plugin-capability norn.graph:graph.node.activate
+  --expect-plugin-capability norn.graph:graph.node.activate `
+  --expect-plugin-runtime sai.vn:executable-sidecar `
+  --expect-plugin-runtime-transport sai.vn:cultmesh `
+  --expect-plugin-runtime-authority sai.vn:no-provider-state-mutation `
+  --expect-plugin-runtime norn.graph:executable-sidecar `
+  --expect-plugin-runtime-transport norn.graph:cultmesh `
+  --expect-plugin-runtime-authority norn.graph:no-provider-state-mutation
 
 if ($LASTEXITCODE -ne 0) {
   throw "Plugin owner conformance consumer smoke failed with exit code $LASTEXITCODE"
diff --git a/tools/conformance/consume-export.mjs b/tools/conformance/consume-export.mjs
index f530ade..3383318 100644
--- a/tools/conformance/consume-export.mjs
+++ b/tools/conformance/consume-export.mjs
@@ -21,6 +21,9 @@ if (!exportDirectory) {
     "  --expect-conformance-handoff",
     "  --expect-plugin-operation <pluginId:operation>",
     "  --expect-plugin-capability <pluginId:capability>",
+    "  --expect-plugin-runtime <pluginId:invocationModel>",
+    "  --expect-plugin-runtime-transport <pluginId:transport>",
+    "  --expect-plugin-runtime-authority <pluginId:authority>",
     "  --expect-plugin-handoff <pluginId>",
     "  --expect-provider-surface <providerId:surfaceId>",
     "  --expect-provider-surface-kind <providerId:surfaceId:surfaceKind>",
@@ -153,6 +156,36 @@ function validateIndex(index, directory, expectations, errors) {
       errors.push(`plugins:${expectation.pluginId}:capability:${expectation.capability}:missing`);
     }
   }
+  for (const expectation of expectations.pluginRuntimes) {
+    const plugin = plugins.find(candidate => candidate.pluginId === expectation.pluginId);
+    if (!plugin) {
+      errors.push(`plugins:${expectation.pluginId}:missing`);
+      continue;
+    }
+    if (plugin.runtimeBoundary?.invocationModel !== expectation.invocationModel) {
+      errors.push(`plugins:${expectation.pluginId}:runtime:expected ${expectation.invocationModel} got ${plugin.runtimeBoundary?.invocationModel || ""}`);
+    }
+  }
+  for (const expectation of expectations.pluginRuntimeTransports) {
+    const plugin = plugins.find(candidate => candidate.pluginId === expectation.pluginId);
+    if (!plugin) {
+      errors.push(`plugins:${expectation.pluginId}:missing`);
+      continue;
+    }
+    if (!Array.isArray(plugin.runtimeBoundary?.transports) || !plugin.runtimeBoundary.transports.includes(expectation.transport)) {
+      errors.push(`plugins:${expectation.pluginId}:runtime.transport:${expectation.transport}:missing`);
+    }
+  }
+  for (const expectation of expectations.pluginRuntimeAuthorities) {
+    const plugin = plugins.find(candidate => candidate.pluginId === expectation.pluginId);
+    if (!plugin) {
+      errors.push(`plugins:${expectation.pluginId}:missing`);
+      continue;
+    }
+    if (!Array.isArray(plugin.runtimeBoundary?.authority) || !plugin.runtimeBoundary.authority.includes(expectation.authority)) {
+      errors.push(`plugins:${expectation.pluginId}:runtime.authority:${expectation.authority}:missing`);
+    }
+  }
   for (const expectedPlugin of expectations.pluginHandoffs) {
     const plugin = plugins.find(candidate => candidate.pluginId === expectedPlugin);
     if (!plugin) {
@@ -422,6 +455,9 @@ function parseArguments(args) {
     plugins: [],
     pluginOperations: [],
     pluginCapabilities: [],
+    pluginRuntimes: [],
+    pluginRuntimeTransports: [],
+    pluginRuntimeAuthorities: [],
     pluginHandoffs: [],
     providers: [],
     providerSurfaces: [],
@@ -454,6 +490,9 @@ function parseArguments(args) {
     ["--expect-split-target", expectations.splitTargets],
     ["--expect-plugin-operation", expectations.pluginOperations],
     ["--expect-plugin-capability", expectations.pluginCapabilities],
+    ["--expect-plugin-runtime", expectations.pluginRuntimes],
+    ["--expect-plugin-runtime-transport", expectations.pluginRuntimeTransports],
+    ["--expect-plugin-runtime-authority", expectations.pluginRuntimeAuthorities],
     ["--expect-plugin-handoff", expectations.pluginHandoffs],
     ["--expect-provider-surface", expectations.providerSurfaces],
     ["--expect-provider-surface-kind", expectations.providerSurfaceKinds],
@@ -495,6 +534,12 @@ function parseArguments(args) {
       target.push(parsePluginExpectation(value, "operation"));
     } else if (option === "--expect-plugin-capability") {
       target.push(parsePluginExpectation(value, "capability"));
+    } else if (option === "--expect-plugin-runtime") {
+      target.push(parsePluginExpectation(value, "invocationModel"));
+    } else if (option === "--expect-plugin-runtime-transport") {
+      target.push(parsePluginExpectation(value, "transport"));
+    } else if (option === "--expect-plugin-runtime-authority") {
+      target.push(parsePluginExpectation(value, "authority"));
     } else if (option === "--expect-plugin-handoff") {
       target.push(value);
     } else if (option === "--expect-provider-surface") {
diff --git a/tools/parity/parity-manifest.json b/tools/parity/parity-manifest.json
index be64379..cc02a74 100644
--- a/tools/parity/parity-manifest.json
+++ b/tools/parity/parity-manifest.json
@@ -372,6 +372,12 @@
       "graduationTrigger": "Split when VN/Ink semantics, story command fixtures, and ABI project/apply/validate cases are stable.",
       "capabilities": ["vn.stage", "story.choose", "story.continue", "story.jump"],
       "optionalPlugins": ["norn.graph", "tex.math"],
+      "expectedRuntime": {
+        "invocationModel": "executable-sidecar",
+        "contract": "gamecult.eve.plugin_abi.v1",
+        "transports": ["cultmesh", "stdio"],
+        "authority": ["renderer-independent", "no-provider-state-mutation", "provider-accepts-or-denies-commands"]
+      },
       "requiredFixtures": ["sai-vn"],
       "schemaPath": "schemas/gamecult.eve.plugin.v1.schema.json",
       "manifestPath": "plugins/incubating/sai-vn.plugin.json",
@@ -396,6 +402,12 @@
       "splitTarget": "Norn/eve-plugin-graph",
       "graduationTrigger": "Split when embed.norn graph layout, interaction, fallback, and conformance fixtures are stable.",
       "capabilities": ["embed.norn", "graph.node.activate"],
+      "expectedRuntime": {
+        "invocationModel": "executable-sidecar",
+        "contract": "gamecult.eve.plugin_abi.v1",
+        "transports": ["cultmesh", "stdio"],
+        "authority": ["renderer-independent", "no-provider-state-mutation", "provider-accepts-or-denies-commands"]
+      },
       "requiredFixtures": ["sai-vn"],
       "schemaPath": "schemas/gamecult.eve.plugin.v1.schema.json",
       "manifestPath": "plugins/incubating/norn-graph.plugin.json",
@@ -420,6 +432,12 @@
       "splitTarget": "EvePlugins/eve-plugin-tex",
       "graduationTrigger": "Split when TeX source, macro, baseline, cached render, and fallback fixtures are stable.",
       "capabilities": ["embed.tex", "tex.inline", "tex.block"],
+      "expectedRuntime": {
+        "invocationModel": "executable-sidecar",
+        "contract": "gamecult.eve.plugin_abi.v1",
+        "transports": ["cultmesh", "stdio"],
+        "authority": ["renderer-independent", "no-provider-state-mutation", "provider-accepts-or-denies-commands"]
+      },
       "requiredFixtures": ["sai-vn"],
       "schemaPath": "schemas/gamecult.eve.plugin.v1.schema.json",
       "manifestPath": "plugins/incubating/tex-math.plugin.json",
diff --git a/tools/parity/run-parity.mjs b/tools/parity/run-parity.mjs
index 0636f8b..9572d86 100644
--- a/tools/parity/run-parity.mjs
+++ b/tools/parity/run-parity.mjs
@@ -443,6 +443,8 @@ async function evaluatePlugin(plugin, fixtureResults) {
     schema: "gamecult.eve.plugin_advertisement.v1",
     pluginId: plugin.pluginId,
   });
+  const runtimeBoundary = await readPluginRuntimeBoundary(plugin);
+  const runtimeBoundaryErrors = validatePluginRuntimeBoundary(plugin, runtimeBoundary);
   const abiOperations = await readPluginAbiOperations(plugin.abiFixturePath);
   const abiErrors = await validatePluginAbiFixture(plugin);
   const status = missingPaths.length
@@ -455,7 +457,9 @@ async function evaluatePlugin(plugin, fixtureResults) {
           ? "invalid-plugin-manifest"
           : advertisementErrors.length
             ? "invalid-plugin-advertisement"
-            : abiErrors.length
+            : runtimeBoundaryErrors.length
+              ? "invalid-plugin-runtime-boundary"
+              : abiErrors.length
               ? "invalid-plugin-abi-fixture"
               : plugin.kind === "incubating"
                 ? "incubating"
@@ -471,6 +475,8 @@ async function evaluatePlugin(plugin, fixtureResults) {
     splitTarget: plugin.splitTarget || "",
     capabilities: plugin.capabilities || [],
     optionalPlugins: plugin.optionalPlugins || [],
+    runtimeBoundary,
+    runtimeBoundaryErrors,
     requiredFixtures,
     missingRequiredFixtures,
     schemaPath: plugin.schemaPath || "",
@@ -503,6 +509,60 @@ async function readPluginAbiOperations(abiFixturePath) {
   }
 }
 
+async function readPluginRuntimeBoundary(plugin) {
+  try {
+    const manifestDocument = await readJsonDocument(plugin.manifestPath);
+    const advertisementDocument = await readJsonDocument(plugin.advertisementPath);
+    return {
+      invocationModel: manifestDocument.runtime?.invocationModel || "",
+      contract: manifestDocument.runtime?.contract || "",
+      transports: manifestDocument.runtime?.transports || [],
+      authority: manifestDocument.runtime?.authority || [],
+      advertisementInvocationModel: advertisementDocument.runtime?.invocationModel || "",
+      advertisementContract: advertisementDocument.runtime?.contract || "",
+      advertisementTransports: advertisementDocument.runtime?.transports || [],
+      advertisementAuthority: advertisementDocument.runtime?.authority || [],
+    };
+  } catch {
+    return {
+      invocationModel: "",
+      contract: "",
+      transports: [],
+      authority: [],
+      advertisementInvocationModel: "",
+      advertisementContract: "",
+      advertisementTransports: [],
+      advertisementAuthority: [],
+    };
+  }
+}
+
+function validatePluginRuntimeBoundary(plugin, runtimeBoundary) {
+  const errors = [];
+  const expectedRuntime = plugin.expectedRuntime || {};
+  if (!runtimeBoundary.invocationModel) errors.push("runtime.invocationModel:missing");
+  if (!runtimeBoundary.contract) errors.push("runtime.contract:missing");
+  if (!runtimeBoundary.transports?.length) errors.push("runtime.transports:missing");
+  if (!runtimeBoundary.authority?.length) errors.push("runtime.authority:missing");
+  if (runtimeBoundary.invocationModel !== runtimeBoundary.advertisementInvocationModel) {
+    errors.push(`runtime.invocationModel:advertisement:expected ${runtimeBoundary.invocationModel} got ${runtimeBoundary.advertisementInvocationModel}`);
+  }
+  if (runtimeBoundary.contract !== runtimeBoundary.advertisementContract) {
+    errors.push(`runtime.contract:advertisement:expected ${runtimeBoundary.contract} got ${runtimeBoundary.advertisementContract}`);
+  }
+  if (expectedRuntime.invocationModel && runtimeBoundary.invocationModel !== expectedRuntime.invocationModel) {
+    errors.push(`runtime.invocationModel:expected ${expectedRuntime.invocationModel} got ${runtimeBoundary.invocationModel}`);
+  }
+  if (expectedRuntime.contract && runtimeBoundary.contract !== expectedRuntime.contract) {
+    errors.push(`runtime.contract:expected ${expectedRuntime.contract} got ${runtimeBoundary.contract}`);
+  }
+  errors.push(...missingMembers(expectedRuntime.transports || [], runtimeBoundary.transports || [], "runtime.transports"));
+  errors.push(...missingMembers(expectedRuntime.transports || [], runtimeBoundary.advertisementTransports || [], "runtime.advertisementTransports"));
+  errors.push(...missingMembers(expectedRuntime.authority || [], runtimeBoundary.authority || [], "runtime.authority"));
+  errors.push(...missingMembers(expectedRuntime.authority || [], runtimeBoundary.advertisementAuthority || [], "runtime.advertisementAuthority"));
+  return errors;
+}
+
 async function evaluateFixtureMetadata(fixture) {
   const errors = [];
   if (!fixture.metadataPath) return { metadata: null, errors: ["metadataPath:missing"] };
@@ -1399,6 +1459,7 @@ function buildConformanceExport(report) {
       handoffExportPath: makeHandoffExportPath("plugin", plugin.pluginId, plugin.handoffPath),
       abiFixturePath: plugin.abiFixturePath,
       abiOperations: plugin.abiOperations || [],
+      runtimeBoundary: plugin.runtimeBoundary,
       optionalPlugins: plugin.optionalPlugins || [],
       capabilities: plugin.capabilities,
     })),
@@ -1531,6 +1592,7 @@ function collectCapabilityGaps(report) {
       ...(plugin.missingIncubationFields || []).map(id => `metadata:${id}`),
       ...(plugin.schemaErrors || []).map(id => `schema:${id}`),
       ...(plugin.advertisementErrors || []).map(id => `advertisement:${id}`),
+      ...(plugin.runtimeBoundaryErrors || []).map(id => `runtime-boundary:${id}`),
       ...(plugin.abiErrors || []).map(id => `abi:${id}`),
     ]) {
       addGap({
@@ -1793,6 +1855,7 @@ function renderMarkdown(report) {
       ...plugin.missingIncubationFields.map(id => `metadata:${id}`),
       ...plugin.schemaErrors.map(id => `schema:${id}`),
       ...plugin.advertisementErrors.map(id => `advertisement:${id}`),
+      ...plugin.runtimeBoundaryErrors.map(id => `runtime-boundary:${id}`),
       ...plugin.abiErrors.map(id => `abi:${id}`),
     ].join(", ");
     lines.push(`| ${plugin.title || plugin.pluginId} | ${plugin.status} | ${plugin.ownerRepo} | ${(plugin.abiOperations || []).join(", ")} | ${plugin.abiFixturePath || ""} | ${plugin.capabilities.join(", ")} | ${missing} |`);