diff --git a/core/lambda/contract_ingestor.py b/core/lambda/contract_ingestor.py
index 9b8c0b1..dad2cfe 100644
--- a/core/lambda/contract_ingestor.py
+++ b/core/lambda/contract_ingestor.py
@@ -499,4 +499,23 @@ def lambda_handler(event, context):
             return {"statusCode": 401, "body": json.dumps({"error": str(e)})}
         return {"statusCode": 400, "body": json.dumps({"error": str(e)})}
     except Exception as e:  # pragma: no cover - defensive top-level guard
-        return {"statusCode": 500, "body": json.dumps({"error": str(e)})}
\ No newline at end of file
+        return {"statusCode": 500, "body": json.dumps({"error": str(e)})}
+
+
+# --- CLI: --check-readiness (D-133, REQ-218) ---------------------------
+# Invoked as: python3 -m core.lambda.contract_ingestor --check-readiness <submission.json>
+# Delegates to core.submission_readiness.check_readiness() and prints the
+# structured ReadinessResult. Exits 0 if ready, 1 if not.
+if __name__ == "__main__":  # pragma: no cover - CLI entry
+    import sys
+    if "--check-readiness" in sys.argv:
+        sys.path.insert(
+            0, os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+        )
+        from core.submission_readiness import cli_main
+
+        # Strip the --check-readiness flag; pass the file path.
+        rest = [a for a in sys.argv[1:] if a != "--check-readiness"]
+        sys.exit(cli_main(["check-readiness"] + rest))
+    else:
+        print("Usage: python3 -m core.lambda.contract_ingestor --check-readiness <submission.json>")
\ No newline at end of file
diff --git a/core/submission_readiness.py b/core/submission_readiness.py
new file mode 100644
index 0000000..a3f9b0b
--- /dev/null
+++ b/core/submission_readiness.py
@@ -0,0 +1,193 @@
+"""core/submission_readiness.py — Nova submission-readiness validator (REQ-218).
+
+Defines what is acceptable to start — a superset gate ABOVE
+contract.schema.json validity. Invoked as
+``contract_ingestor.py --check-readiness`` (D-133). Returns a structured
+ReadinessResult (pass/fail per check, with reason codes). On fail → the
+ingestor rejects with a citizen-developer-facing error (not a stack
+trace). On pass → proceeds to existing contract ingestion.
+
+The validator calls contract.schema.json validation first (the shape),
+then the readiness checks (the gate): tags, env mandatory, policy
+preconditions, profile:agentic markers, appSource.
+
+Reason codes:
+  MISSING_TAGS — one or more required Nova tags are absent
+  ENV_MISSING_MANDATORY:<env>:<field> — a per-env mandatory field is missing
+  AGENTIC_MISSING_INTENT — profile=agentic but naturalLanguageIntent absent
+  MISSING_APP_SOURCE — appSource (repo + ref) is missing
+  POLICY_PRECONDITION_MISSING — a declared policy precondition is absent
+"""
+from __future__ import annotations
+
+import json
+import os
+import sys
+from dataclasses import dataclass, field
+from typing import Any
+
+_SCHEMA_DIR = os.path.join(
+    os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "schemas"
+)
+
+REQUIRED_TAGS = [
+    "nova:owner",
+    "nova:contract",
+    "nova:environment",
+    "nova:cost-center",
+    "nova:ref",
+]
+
+ENV_MANDATORY: dict[str, list[str]] = {
+    "dev": [],  # dev requires only the base contract shape (id+environment+infrastructure)
+    "qa": ["validation.e2eSuite", "validation.loadTest"],
+    "prod": ["runbook", "dashboard", "oncall"],
+    "dr": ["drDrillRef"],
+}
+
+AGENTIC_REQUIRED = ["naturalLanguageIntent", "confidenceAtSubmission", "agentTrace"]
+
+
+@dataclass
+class ReadinessResult:
+    """Structured result of the submission-readiness gate."""
+
+    ready: bool
+    reason_codes: list[str] = field(default_factory=list)
+    contract_id: str | None = None
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "ready": self.ready,
+            "reason_codes": self.reason_codes,
+            "contractId": self.contract_id,
+        }
+
+    def __str__(self) -> str:
+        if self.ready:
+            return f"READY — contract {self.contract_id} passes submission-readiness gate"
+        codes = "; ".join(self.reason_codes) if self.reason_codes else "unknown"
+        return f"NOT READY — contract {self.contract_id}: {codes}"
+
+
+def _validate_contract_schema(contract: dict[str, Any]) -> list[str]:
+    """Validate the contract against contract.schema.json (the shape).
+    Returns a list of reason codes (empty if valid). Falls back to no-op
+    if jsonschema or the schema file is unavailable (the contract is
+    validated upstream by run_platform.sh in the normal path).
+    """
+    codes: list[str] = []
+    try:
+        import jsonschema
+
+        schema_path = os.path.join(_SCHEMA_DIR, "contract.schema.json")
+        with open(schema_path) as f:
+            schema = json.load(f)
+        jsonschema.validate(instance=contract, schema=schema)
+    except (OSError, ImportError):
+        pass
+    except jsonschema.ValidationError as e:
+        codes.append(f"CONTRACT_SCHEMA_INVALID:{e.message}")
+    return codes
+
+
+def _get_nested(data: dict[str, Any], dotted_key: str) -> Any:
+    parts = dotted_key.split(".")
+    val: Any = data
+    for p in parts:
+        if not isinstance(val, dict) or p not in val:
+            return None
+        val = val[p]
+    return val
+
+
+def check_readiness(submission: dict[str, Any]) -> ReadinessResult:
+    """Run the full submission-readiness gate.
+
+    1. Validate the contract shape (contract.schema.json).
+    2. Validate the readiness schema (submission-readiness.schema.json).
+    3. Run the semantic readiness checks (tags, env mandatory, agentic, appSource, policy).
+
+    Returns a ReadinessResult. Never raises — all failures are reason codes.
+    """
+    contract_id = submission.get("contractId") or submission.get("id", "unknown")
+    codes: list[str] = []
+
+    # Step 1: contract shape validation
+    contract_shape = {k: v for k, v in submission.items() if k in ("id", "name", "environment", "infrastructure")}
+    if contract_shape:
+        codes.extend(_validate_contract_schema(contract_shape))
+
+    # Step 2: readiness schema validation
+    try:
+        import jsonschema
+
+        schema_path = os.path.join(_SCHEMA_DIR, "submission-readiness.schema.json")
+        with open(schema_path) as f:
+            readiness_schema = json.load(f)
+        jsonschema.validate(instance=submission, schema=readiness_schema)
+    except (OSError, ImportError):
+        pass
+    except jsonschema.ValidationError as e:
+        codes.append(f"READINESS_SCHEMA_INVALID:{e.message}")
+
+    # Step 3: semantic checks (reason codes for citizen-developer-facing errors)
+
+    # 3a: tags
+    tags = submission.get("tags", {})
+    missing_tags = [t for t in REQUIRED_TAGS if t not in tags or not tags[t]]
+    if missing_tags:
+        codes.append(f"MISSING_TAGS:{','.join(missing_tags)}")
+
+    # 3b: env mandatory (W3.E per-env table)
+    env = submission.get("environment")
+    if env and env in ENV_MANDATORY:
+        for field_key in ENV_MANDATORY[env]:
+            val = _get_nested(submission, field_key)
+            if val is None:
+                codes.append(f"ENV_MISSING_MANDATORY:{env}:{field_key}")
+
+    # 3c: agentic profile markers
+    if submission.get("profile") == "agentic":
+        for marker in AGENTIC_REQUIRED:
+            if not submission.get(marker):
+                codes.append(f"AGENTIC_MISSING_INTENT:{marker}")
+
+    # 3d: appSource
+    app_source = submission.get("appSource")
+    if not app_source or not app_source.get("repo") or not app_source.get("ref"):
+        codes.append("MISSING_APP_SOURCE")
+
+    # 3e: policy preconditions (warn if declared but not enforced this milestone)
+    policy = submission.get("policyPreconditions", {})
+    if not policy:
+        codes.append("POLICY_PRECONDITION_MISSING")
+
+    ready = len(codes) == 0
+    return ReadinessResult(ready=ready, reason_codes=codes, contract_id=contract_id)
+
+
+def cli_main(argv: list[str]) -> int:
+    """CLI entry: python3 -m core.submission_readiness <contract.json>
+
+    Also invoked via contract_ingestor.py --check-readiness (D-133).
+    Prints the ReadinessResult to stdout; exits 0 if ready, 1 if not.
+    """
+    if len(argv) < 2:
+        print("Usage: submission_readiness <contract.json>", file=sys.stderr)
+        return 2
+    path = argv[1]
+    try:
+        with open(path) as f:
+            submission = json.load(f)
+    except (OSError, json.JSONDecodeError) as e:
+        print(f"ERROR: cannot read {path}: {e}", file=sys.stderr)
+        return 2
+    result = check_readiness(submission)
+    print(result)
+    print(json.dumps(result.to_dict(), indent=2))
+    return 0 if result.ready else 1
+
+
+if __name__ == "__main__":
+    sys.exit(cli_main(sys.argv))
\ No newline at end of file
diff --git a/docs/submission-readiness.md b/docs/submission-readiness.md
new file mode 100644
index 0000000..8e76567
--- /dev/null
+++ b/docs/submission-readiness.md
@@ -0,0 +1,150 @@
+# Submission Readiness — What is Acceptable to Start
+
+> **Source of truth:** `schemas/submission-readiness.schema.json` (v1.18,
+> REQ-217). The validator is `core/submission_readiness.py` (REQ-218),
+> invoked as `python3 -m core.lambda.contract_ingestor --check-readiness
+> <submission.json>` (D-133).
+
+Nova's submission-readiness gate defines what is **acceptable to start**.
+It is a superset gate *above* contract-schema validity: the contract schema
+(`schemas/contract.schema.json`) defines the **shape** (id / name /
+environment / infrastructure); the readiness schema defines the **gate**
+(tags, per-env mandatory metadata, policy preconditions, profile markers,
+appSource). Both must pass before ingestion proceeds.
+
+## How It Works
+
+```
+citizen developer submits
+        ↓
+contract.schema.json validation (shape)     ← the existing check
+        ↓
+submission-readiness.schema.json (gate)     ← the new check
+  ├── contractId present (non-empty)
+  ├── environment valid (dev/qa/prod/dr)
+  ├── tags: all 5 Nova tags present (D-054)
+  ├── policyPreconditions declared
+  ├── profile: developer or agentic
+  │     └── if agentic: naturalLanguageIntent + confidenceAtSubmission + agentTrace
+  ├── appSource: repo + ref (for runtime fetch)
+  └── per-env mandatory (W3.E):
+        dev  → stack + environment
+        qa   → + validation.e2eSuite + validation.loadTest
+        prod → + runbook + dashboard + oncall
+        dr   → + drDrillRef
+        ↓
+ready → proceed to contract ingestion
+not ready → reject with citizen-developer-facing error (reason code)
+```
+
+## Reason Codes
+
+When a submission is not ready, the validator returns one or more reason
+codes. These are citizen-developer-facing — no stack traces.
+
+| Code | Meaning |
+|---|---|
+| `MISSING_TAGS:<tag1>,<tag2>` | One or more required Nova tags are absent |
+| `ENV_MISSING_MANDATORY:<env>:<field>` | A per-env mandatory field (W3.E) is missing |
+| `AGENTIC_MISSING_INTENT:<marker>` | profile=agentic but a required marker is absent |
+| `MISSING_APP_SOURCE` | appSource (repo + ref) is missing |
+| `POLICY_PRECONDITION_MISSING` | No policy preconditions declared |
+| `CONTRACT_SCHEMA_INVALID:<detail>` | The contract shape failed contract.schema.json |
+| `READINESS_SCHEMA_INVALID:<detail>` | The submission failed the readiness schema |
+
+## Good Example
+
+```json
+{
+  "contractId": "uuid-1234",
+  "id": "webapi",
+  "name": "Customer Web API",
+  "environment": "dev",
+  "tags": {
+    "nova:owner": "consumer-repo",
+    "nova:contract": "uuid-1234",
+    "nova:environment": "dev",
+    "nova:cost-center": "nova-default",
+    "nova:ref": "CHG0678912"
+  },
+  "policyPreconditions": {
+    "public-ingress": false,
+    "encryption_enabled": true,
+    "deletion_protection": true
+  },
+  "profile": "developer",
+  "appSource": {
+    "repo": "consumer/web-api",
+    "ref": "main"
+  },
+  "infrastructure": {
+    "static-assets": {
+      "inputs": {
+        "bucket_name": "webapi-assets"
+      }
+    }
+  }
+}
+```
+
+Result: **READY** — passes the shape + the gate.
+
+## Rejected Examples
+
+### Missing Tags
+
+```json
+{
+  "contractId": "uuid-1234",
+  "environment": "dev",
+  "tags": {
+    "nova:owner": "consumer-repo"
+  },
+  "policyPreconditions": {"public-ingress": false},
+  "profile": "developer",
+  "appSource": {"repo": "consumer/repo", "ref": "main"}
+}
+```
+
+Result: `NOT READY — MISSING_TAGS:nova:contract,nova:environment,nova:cost-center,nova:ref`
+
+### Agentic Missing Intent
+
+```json
+{
+  "contractId": "uuid-1234",
+  "environment": "qa",
+  "tags": { "nova:owner": "x", "nova:contract": "x", "nova:environment": "qa", "nova:cost-center": "x", "nova:ref": "x" },
+  "policyPreconditions": {"public-ingress": false},
+  "profile": "agentic",
+  "appSource": {"repo": "x", "ref": "x"},
+  "validation": {"e2eSuite": true, "loadTest": true}
+}
+```
+
+Result: `NOT READY — AGENTIC_MISSING_INTENT:naturalLanguageIntent; AGENTIC_MISSING_INTENT:confidenceAtSubmission; AGENTIC_MISSING_INTENT:agentTrace`
+
+### Env Missing Mandatory (prod without runbook)
+
+```json
+{
+  "contractId": "uuid-1234",
+  "environment": "prod",
+  "tags": { "nova:owner": "x", "nova:contract": "x", "nova:environment": "prod", "nova:cost-center": "x", "nova:ref": "x" },
+  "policyPreconditions": {"public-ingress": false},
+  "profile": "developer",
+  "appSource": {"repo": "x", "ref": "x"}
+}
+```
+
+Result: `NOT READY — ENV_MISSING_MANDATORY:prod:runbook; ENV_MISSING_MANDATORY:prod:dashboard; ENV_MISSING_MANDATORY:prod:oncall`
+
+## Compliance-Standard Equivalence
+
+The submission-readiness gate applies **equally** to all upstream sources.
+Whether the citizen developer's submission originated from an AI coding
+agent, an agentic SDLC platform, or a traditional development platform —
+the same tags, the same env mandatory, the same policy preconditions, the
+same profile markers are required. The source does not matter; the
+submission does. This is the RACI compliance-standard equivalence note
+(`docs/raci.md`) made machine-checkable.
\ No newline at end of file
diff --git a/schemas/submission-readiness.schema.json b/schemas/submission-readiness.schema.json
new file mode 100644
index 0000000..a8be927
--- /dev/null
+++ b/schemas/submission-readiness.schema.json
@@ -0,0 +1,104 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://nova.dev/schemas/submission-readiness.schema.json",
+  "title": "Nova Submission-Readiness Gate",
+  "description": "Defines what is acceptable to start — a superset gate ABOVE contract.schema.json validity. The contract schema defines the SHAPE (id/name/environment/infrastructure); this schema defines the READINESS gate: required Nova tags, per-env mandatory metadata (W3.E), declared policy preconditions, profile:agentic markers, and the appSource pointer. The validator (core/submission_readiness.py, REQ-218) calls contract.schema.json validation first, then these readiness checks. On fail → citizen-developer-facing error (not a stack trace); on pass → proceeds to existing contract ingestion.",
+  "type": "object",
+  "required": ["contractId", "environment", "tags", "policyPreconditions", "profile", "appSource"],
+  "properties": {
+    "contractId": {
+      "type": "string",
+      "minLength": 1,
+      "description": "The contract identifier (UUID or operational id). Non-empty."
+    },
+    "environment": {
+      "type": "string",
+      "enum": ["dev", "qa", "prod", "dr"],
+      "description": "Target environment. Determines the per-env mandatory fields (allOf below)."
+    },
+    "tags": {
+      "type": "object",
+      "description": "The 5 required Nova tags (D-054). References schemas/tagging-standard.json.",
+      "required": ["nova:owner", "nova:contract", "nova:environment", "nova:cost-center", "nova:ref"],
+      "properties": {
+        "nova:owner": {"type": "string", "minLength": 1},
+        "nova:contract": {"type": "string", "minLength": 1},
+        "nova:environment": {"type": "string", "enum": ["dev", "qa", "prod", "dr"]},
+        "nova:cost-center": {"type": "string", "minLength": 1},
+        "nova:ref": {"type": "string", "minLength": 1}
+      },
+      "additionalProperties": false
+    },
+    "policyPreconditions": {
+      "type": "object",
+      "description": "Declared policy expectations the platform will enforce. The citizen developer states what the platform should check; the platform enforces it at apply time. Missing a declared precondition is POLICY_PRECONDITION_MISSING.",
+      "properties": {
+        "public-ingress": {"type": "boolean", "default": false},
+        "encryption_enabled": {"type": "boolean", "default": true},
+        "deletion_protection": {"type": "boolean", "default": true}
+      },
+      "additionalProperties": true
+    },
+    "profile": {
+      "type": "string",
+      "enum": ["developer", "agentic"],
+      "description": "developer = L3A (technical); agentic = L3B (non-technical, requires naturalLanguageIntent + confidenceAtSubmission + agentTrace per REQ-22 / W3.E)."
+    },
+    "appSource": {
+      "type": "object",
+      "description": "Pointer to the consumer application code so the platform can fetch at run time.",
+      "required": ["repo", "ref"],
+      "properties": {
+        "repo": {"type": "string", "minLength": 1, "description": "Repository URL or owner/repo shorthand."},
+        "ref": {"type": "string", "minLength": 1, "description": "Git ref (branch, tag, or SHA)."}
+      },
+      "additionalProperties": false
+    },
+    "naturalLanguageIntent": {
+      "type": "string",
+      "description": "Required when profile=agentic (L3B). The citizen developer's plain-language intent."
+    },
+    "confidenceAtSubmission": {
+      "type": "number",
+      "minimum": 0,
+      "maximum": 1,
+      "description": "Required when profile=agentic (L3B). The submitter's self-assessed confidence."
+    },
+    "agentTrace": {
+      "type": "string",
+      "description": "Required when profile=agentic (L3B). The agent's trace/reasoning for the submission."
+    },
+    "validation": {
+      "type": "object",
+      "description": "Per-env mandatory metadata (W3.E). qa requires e2eSuite + loadTest; prod requires runbook + dashboard + oncall; dr requires drDrillRef.",
+      "properties": {
+        "e2eSuite": {"type": "boolean"},
+        "loadTest": {"type": "boolean"}
+      },
+      "additionalProperties": true
+    },
+    "runbook": {"type": "string", "description": "Required when environment=prod (W3.E)."},
+    "dashboard": {"type": "string", "description": "Required when environment=prod (W3.E)."},
+    "oncall": {"type": "string", "description": "Required when environment=prod (W3.E)."},
+    "drDrillRef": {"type": "string", "description": "Required when environment=dr (W3.E)."}
+  },
+  "allOf": [
+    {
+      "if": {"properties": {"environment": {"const": "qa"}}},
+      "then": {"required": ["validation"], "properties": {"validation": {"required": ["e2eSuite", "loadTest"]}}}
+    },
+    {
+      "if": {"properties": {"environment": {"const": "prod"}}},
+      "then": {"required": ["runbook", "dashboard", "oncall"]}
+    },
+    {
+      "if": {"properties": {"environment": {"const": "dr"}}},
+      "then": {"required": ["drDrillRef"]}
+    },
+    {
+      "if": {"properties": {"profile": {"const": "agentic"}}},
+      "then": {"required": ["naturalLanguageIntent", "confidenceAtSubmission", "agentTrace"]}
+    }
+  ],
+  "additionalProperties": true
+}
\ No newline at end of file
diff --git a/tests/test_submission_readiness.py b/tests/test_submission_readiness.py
new file mode 100644
index 0000000..8abdc7b
--- /dev/null
+++ b/tests/test_submission_readiness.py
@@ -0,0 +1,189 @@
+"""tests/test_submission_readiness.py — REQ-220.
+
+Covers: good contract passes; missing tags fail with MISSING_TAGS;
+env-missing-mandatory fails with ENV_MISSING_MANDATORY:<env>:<field>;
+agentic profile missing intent fails with AGENTIC_MISSING_INTENT;
+missing appSource fails with MISSING_APP_SOURCE.
+"""
+import json
+import os
+import sys
+import unittest
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+from core.submission_readiness import check_readiness, ReadinessResult
+
+GOOD_TAGS = {
+    "nova:owner": "consumer-repo",
+    "nova:contract": "uuid-1234",
+    "nova:environment": "dev",
+    "nova:cost-center": "nova-default",
+    "nova:ref": "CHG0678912",
+}
+
+
+def _base(**overrides):
+    submission = {
+        "contractId": "uuid-1234",
+        "id": "webapi",
+        "name": "Customer Web API",
+        "environment": "dev",
+        "tags": dict(GOOD_TAGS),
+        "policyPreconditions": {"public-ingress": False, "encryption_enabled": True},
+        "profile": "developer",
+        "appSource": {"repo": "consumer/repo", "ref": "main"},
+        "infrastructure": {
+            "static-assets": {"inputs": {"bucket_name": "webapi-assets"}}
+        },
+    }
+    submission.update(overrides)
+    return submission
+
+
+class TestGoodContract(unittest.TestCase):
+    def test_good_contract_passes(self):
+        result = check_readiness(_base())
+        self.assertTrue(result.ready, f"Expected ready, got: {result.reason_codes}")
+        self.assertEqual(result.contract_id, "uuid-1234")
+
+    def test_good_agentic_contract_passes(self):
+        submission = _base(
+            profile="agentic",
+            naturalLanguageIntent="A web API for customer data",
+            confidenceAtSubmission=0.85,
+            agentTrace="LLM generated contract from issue #42",
+        )
+        result = check_readiness(submission)
+        self.assertTrue(result.ready, f"Expected ready, got: {result.reason_codes}")
+
+
+class TestMissingTags(unittest.TestCase):
+    def test_missing_tags_fail(self):
+        submission = _base()
+        submission["tags"] = {"nova:owner": "consumer-repo"}
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        codes = " ".join(result.reason_codes)
+        self.assertIn("MISSING_TAGS", codes)
+        self.assertIn("nova:contract", codes)
+        self.assertIn("nova:environment", codes)
+        self.assertIn("nova:cost-center", codes)
+        self.assertIn("nova:ref", codes)
+
+    def test_empty_tag_value_fails(self):
+        submission = _base()
+        submission["tags"]["nova:owner"] = ""
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        self.assertTrue(any("MISSING_TAGS" in c for c in result.reason_codes))
+
+
+class TestEnvMissingMandatory(unittest.TestCase):
+    def test_qa_missing_e2e_suite_fails(self):
+        submission = _base(environment="qa")
+        submission["tags"]["nova:environment"] = "qa"
+        # No validation.e2eSuite
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        codes = " ".join(result.reason_codes)
+        self.assertIn("ENV_MISSING_MANDATORY:qa:validation.e2eSuite", codes)
+
+    def test_prod_missing_runbook_fails(self):
+        submission = _base(environment="prod")
+        submission["tags"]["nova:environment"] = "prod"
+        # No runbook/dashboard/oncall
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        codes = " ".join(result.reason_codes)
+        self.assertIn("ENV_MISSING_MANDATORY:prod:runbook", codes)
+        self.assertIn("ENV_MISSING_MANDATORY:prod:dashboard", codes)
+        self.assertIn("ENV_MISSING_MANDATORY:prod:oncall", codes)
+
+    def test_dr_missing_drdrillref_fails(self):
+        submission = _base(environment="dr")
+        submission["tags"]["nova:environment"] = "dr"
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        codes = " ".join(result.reason_codes)
+        self.assertIn("ENV_MISSING_MANDATORY:dr:drDrillRef", codes)
+
+    def test_prod_with_all_mandatory_passes(self):
+        submission = _base(
+            environment="prod",
+            runbook="docs/runbooks/webapi.md",
+            dashboard="https://grafana/nova/webapi",
+            oncall="oncall@company.com",
+        )
+        submission["tags"]["nova:environment"] = "prod"
+        result = check_readiness(submission)
+        self.assertTrue(result.ready, f"Expected ready, got: {result.reason_codes}")
+
+
+class TestAgenticMissingIntent(unittest.TestCase):
+    def test_agentic_missing_all_markers_fails(self):
+        submission = _base(profile="agentic")
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        codes = " ".join(result.reason_codes)
+        self.assertIn("AGENTIC_MISSING_INTENT:naturalLanguageIntent", codes)
+        self.assertIn("AGENTIC_MISSING_INTENT:confidenceAtSubmission", codes)
+        self.assertIn("AGENTIC_MISSING_INTENT:agentTrace", codes)
+
+    def test_agentic_missing_one_marker_fails(self):
+        submission = _base(
+            profile="agentic",
+            naturalLanguageIntent="A web API",
+            confidenceAtSubmission=0.85,
+            # agentTrace missing
+        )
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        self.assertTrue(any("agentTrace" in c for c in result.reason_codes))
+
+
+class TestMissingAppSource(unittest.TestCase):
+    def test_missing_appsource_fails(self):
+        submission = _base()
+        del submission["appSource"]
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        self.assertTrue(any("MISSING_APP_SOURCE" in c for c in result.reason_codes))
+
+    def test_appsource_missing_ref_fails(self):
+        submission = _base()
+        submission["appSource"] = {"repo": "consumer/repo"}
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        self.assertTrue(any("MISSING_APP_SOURCE" in c for c in result.reason_codes))
+
+
+class TestPolicyPreconditionMissing(unittest.TestCase):
+    def test_empty_policy_fails(self):
+        submission = _base()
+        submission["policyPreconditions"] = {}
+        result = check_readiness(submission)
+        self.assertFalse(result.ready)
+        self.assertTrue(any("POLICY_PRECONDITION_MISSING" in c for c in result.reason_codes))
+
+
+class TestReadinessResultStructure(unittest.TestCase):
+    def test_result_to_dict(self):
+        result = check_readiness(_base())
+        d = result.to_dict()
+        self.assertIn("ready", d)
+        self.assertIn("reason_codes", d)
+        self.assertIn("contractId", d)
+
+    def test_result_str_ready(self):
+        result = check_readiness(_base())
+        self.assertIn("READY", str(result))
+
+    def test_result_str_not_ready(self):
+        submission = _base()
+        del submission["appSource"]
+        result = check_readiness(submission)
+        self.assertIn("NOT READY", str(result))
+
+
+if __name__ == "__main__":
+    unittest.main()
\ No newline at end of file