diff --git a/Makefile b/Makefile
index a8c0538..e7ecefd 100644
--- a/Makefile
+++ b/Makefile
@@ -9,4 +9,4 @@ codeartifact-repo-format: init
 	cd ./codeartifact-repo && ../scripts/format.sh 
 
 codeartifact-repo-verify: init
-	cd ./codeartifact-repo && terraform-docs -c ../.terraform-docs.yaml . && ../scripts/verify.sh 
\ No newline at end of file
+	cd ./codeartifact-repo  && ../scripts/verify.sh 
\ No newline at end of file
diff --git a/codeartifact-repo/README.md b/codeartifact-repo/README.md
index ae0918a..a184d32 100644
--- a/codeartifact-repo/README.md
+++ b/codeartifact-repo/README.md
@@ -45,7 +45,7 @@ This module is intended to configure AWS CodeArtifact domains and repositories.
 | <a name="input_domain_policy_document_path"></a> [domain\_policy\_document\_path](#input\_domain\_policy\_document\_path) | Path to IAM policy document applied to Codeartifact domain | `string` | `null` | no |
 | <a name="input_encryption_key_arn"></a> [encryption\_key\_arn](#input\_encryption\_key\_arn) | ARN of KMS key used for repository encryption. If not specified, and use\_default\_ecnryption\_key is false, creates new KMS key | `string` | `null` | no |
 | <a name="input_repo_region"></a> [repo\_region](#input\_repo\_region) | Region in which repository will be managed. If not specified, defaults to region configured for provider | `string` | `null` | no |
-| <a name="input_repositories"></a> [repositories](#input\_repositories) | List of repositories within Codeartifact domain | <pre>list(object({<br/>    repository_name      = string<br/>    description          = optional(string, "")<br/>    region               = optional(string, null)<br/>    domain_owner         = optional(string, null)<br/>    upstream             = optional(string, null)<br/>    external_connection  = optional(string, null)<br/>    policy_document_path = optional(string, null)<br/>  }))</pre> | `[]` | no |
+| <a name="input_repositories"></a> [repositories](#input\_repositories) | List of repositories within Codeartifact domain | <pre>list(object({<br/>    repository_name                 = string<br/>    description                     = optional(string, "")<br/>    region                          = optional(string, null)<br/>    domain_owner                    = optional(string, null)<br/>    upstream                        = optional(string, null)<br/>    external_connection             = optional(string, null)<br/>    policy_document_path            = optional(string, null)<br/>    default_read_access_principals  = optional(list(string), null)<br/>    default_write_access_principals = optional(list(string), null)<br/>  }))</pre> | `[]` | no |
 | <a name="input_tags"></a> [tags](#input\_tags) | Tags to be applied to resources | `map(string)` | `{}` | no |
 | <a name="input_use_default_ecnryption_key"></a> [use\_default\_ecnryption\_key](#input\_use\_default\_ecnryption\_key) | Whether to use default  Codeartifact KMS key (defaults to true) | `bool` | `true` | no |
 
@@ -54,8 +54,10 @@ This module is intended to configure AWS CodeArtifact domains and repositories.
 | Name | Description |
 |------|-------------|
 | <a name="output_created_repositories"></a> [created\_repositories](#output\_created\_repositories) | A list of names of the created repositories. |
+| <a name="output_default_sts_policies"></a> [default\_sts\_policies](#output\_default\_sts\_policies) | Created STS policies |
 | <a name="output_domain"></a> [domain](#output\_domain) | Name of the CodeArtifact domain |
 | <a name="output_domain_owner"></a> [domain\_owner](#output\_domain\_owner) | Owner account of the CodeArtifact domain |
+| <a name="output_policy_documents"></a> [policy\_documents](#output\_policy\_documents) | A map of repository names to their applied policy documents (if any). |
 
 ## Examples
 <!-- END_TF_DOCS -->
\ No newline at end of file
diff --git a/codeartifact-repo/main.tf b/codeartifact-repo/main.tf
index e788ffd..ec9081f 100644
--- a/codeartifact-repo/main.tf
+++ b/codeartifact-repo/main.tf
@@ -5,6 +5,25 @@
 
 locals {
   should_create_kms_key = (!var.use_default_ecnryption_key && var.encryption_key_arn == null) ? true : false
+
+  repo_read_access_principals = {
+    for repo in var.repositories : repo.repository_name => repo.default_read_access_principals if(repo.default_read_access_principals != null
+    && length(repo.default_read_access_principals) > 0)
+  }
+  repo_write_access_principals = {
+    for repo in var.repositories : repo.repository_name => repo.default_write_access_principals if(repo.default_write_access_principals != null
+    && length(repo.default_write_access_principals) > 0)
+  }
+  repo_final_policy_documents = data.aws_iam_policy_document.combined_default_policies
+  # repos_with_policy_files = [
+  #   for repo in var.repositories : repo.repository_name if repo.policy_document_path != null
+  # ]
+  all_sts_principals = {
+    for repo in var.repositories : repo.repository_name => distinct(concat(
+      repo.default_read_access_principals != null ? repo.default_read_access_principals : [],
+      repo.default_write_access_principals != null ? repo.default_write_access_principals : []
+    ))
+  }
 }
 
 resource "aws_codeartifact_domain" "repo_domain" {
@@ -47,11 +66,89 @@ resource "aws_codeartifact_repository" "repository" {
   tags = var.tags
 }
 
+data "aws_iam_policy_document" "default_readonly_repo_policy" {
+  for_each = { for k, v in local.repo_read_access_principals : k => v }
+  statement {
+    effect = "Allow"
+    actions = [
+      "codeartifact:DescribePackageVersion",
+      "codeartifact:DescribeRepository",
+      "codeartifact:GetPackageVersionReadme",
+      "codeartifact:GetRepositoryEndpoint",
+      "codeartifact:ListPackageVersionAssets",
+      "codeartifact:ListPackageVersionDependencies",
+      "codeartifact:ListPackageVersions",
+      "codeartifact:ListPackages",
+      "codeartifact:ReadFromRepository",
+    ]
+    resources = [aws_codeartifact_repository.repository[each.key].arn]
+    principals {
+      type        = "AWS"
+      identifiers = each.value
+    }
+  }
+}
+
+data "aws_iam_policy_document" "default_write_access_repo_policy" {
+  for_each = { for k, v in local.repo_write_access_principals : k => v }
+  statement {
+    effect = "Allow"
+    actions = [
+      "codeartifact:DescribePackageVersion",
+      "codeartifact:DescribeRepository",
+      "codeartifact:GetPackageVersionReadme",
+      "codeartifact:GetRepositoryEndpoint",
+      "codeartifact:ListPackageVersionAssets",
+      "codeartifact:ListPackageVersionDependencies",
+      "codeartifact:ListPackageVersions",
+      "codeartifact:ListPackages",
+      "codeartifact:PublishPackageVersion",
+      "codeartifact:PutPackageMetadata",
+      "codeartifact:ReadFromRepository",
+    ]
+    resources = [aws_codeartifact_repository.repository[each.key].arn]
+    principals {
+      type        = "AWS"
+      identifiers = each.value
+    }
+  }
+}
+
+data "aws_iam_policy_document" "default_sts_policy" {
+  for_each = local.all_sts_principals
+  statement {
+    effect    = "Allow"
+    actions   = ["sts:GetServiceBearerToken"]
+    resources = [aws_codeartifact_repository.repository[each.key].arn]
+    principals {
+      type        = "AWS"
+      identifiers = each.value
+    }
+    condition {
+      variable = "sts:AWSServiceName"
+      values   = ["codeartifact.amazonaws.com"]
+      test     = "StringEquals"
+    }
+  }
+}
+
+data "aws_iam_policy_document" "combined_default_policies" {
+  for_each = { for repo in var.repositories : repo.repository_name => repo if contains(keys(local.repo_read_access_principals), repo.repository_name) || contains(keys(local.repo_write_access_principals), repo.repository_name) }
+
+  source_policy_documents = compact(
+    [
+      try(data.aws_iam_policy_document.default_readonly_repo_policy[each.key].json, null),
+      try(data.aws_iam_policy_document.default_write_access_repo_policy[each.key].json, null),
+      try(data.aws_iam_policy_document.default_sts_policy[each.key].json, null)
+    ]
+  )
+}
+
 resource "aws_codeartifact_repository_permissions_policy" "repo_permissions_policy" {
-  for_each        = { for repo in var.repositories : repo.repository_name => repo if repo.policy_document_path != null }
+  for_each        = { for repo in var.repositories : repo.repository_name => repo if repo.policy_document_path != null || contains(keys(local.repo_final_policy_documents), repo.repository_name) }
   repository      = aws_codeartifact_repository.repository[each.key].repository
   domain          = aws_codeartifact_domain.repo_domain.domain
-  policy_document = file(each.value.policy_document_path)
+  policy_document = each.value.policy_document_path != null ? file(each.value.policy_document_path) : local.repo_final_policy_documents[each.key].json
   region          = var.repo_region != null ? var.repo_region : null
   domain_owner    = each.value.domain_owner != null ? each.value.domain_owner : null
 }
diff --git a/codeartifact-repo/outputs.tf b/codeartifact-repo/outputs.tf
index 3d90ab3..6c55eaf 100644
--- a/codeartifact-repo/outputs.tf
+++ b/codeartifact-repo/outputs.tf
@@ -15,3 +15,13 @@ output "created_repositories" {
   description = "A list of names of the created repositories."
   value       = tolist(keys(aws_codeartifact_repository.repository))
 }
+
+output "policy_documents" {
+  description = "A map of repository names to their applied policy documents (if any)."
+  value       = { for repo_name, repo_policy in aws_codeartifact_repository_permissions_policy.repo_permissions_policy : repo_name => repo_policy.policy_document }
+}
+
+output "default_sts_policies" {
+  description = "Created STS policies"
+  value       = { for repo_name, sts_policy in data.aws_iam_policy_document.default_sts_policy : repo_name => sts_policy.json }
+}
\ No newline at end of file
diff --git a/codeartifact-repo/tests/policies.tftest.hcl b/codeartifact-repo/tests/policies.tftest.hcl
new file mode 100644
index 0000000..f12d8dc
--- /dev/null
+++ b/codeartifact-repo/tests/policies.tftest.hcl
@@ -0,0 +1,137 @@
+// Copyright 2025 Bitshift
+// SPDX-License-Identifier: MPL-2.0
+
+mock_provider "aws" {
+  override_data {
+    target = data.aws_iam_policy_document.default_readonly_repo_policy
+    values = {
+      json = "{}"
+    }
+  }
+  override_data {
+    target = data.aws_iam_policy_document.default_write_access_repo_policy
+    values = {
+      json = "{}"
+    }
+  }
+  override_data {
+    target = data.aws_iam_policy_document.combined_default_policies
+    values = {
+      json = "{}"
+    }
+  }
+}
+
+run "default_policy_should_be_created_when_principals_specified" {
+  command = plan
+
+    variables  {
+        domain_name = "test-domain"
+        repositories = [
+        {
+            repository_name                 = "repo-with-policies"
+            default_read_access_principals  = ["arn:aws:iam::123456789012:role/ReadRole"]
+            default_write_access_principals = ["arn:aws:iam::123456789012:role/WriteRole"]
+        }
+        ]
+    }
+
+    assert {
+      condition     = length(data.aws_iam_policy_document.default_readonly_repo_policy) == 1
+      error_message = "Default read-only policy document was not created."
+    }
+
+    assert {
+      condition     = length(data.aws_iam_policy_document.default_write_access_repo_policy) == 1
+      error_message = "Default write-access policy document was not created."
+    }
+
+    assert {
+      condition = length(data.aws_iam_policy_document.default_sts_policy) == 1
+      error_message = "Default STS policy document was not created."
+    }
+}
+
+run "no_default_policy_when_no_principals" {
+    command = plan
+
+    variables  {
+        domain_name = "test-domain"
+        repositories = [
+        {
+            repository_name = "repo-without-policies"
+        }
+        ]
+    }
+
+    assert {
+      condition     = length(data.aws_iam_policy_document.default_readonly_repo_policy) == 0
+      error_message = "Default read-only policy document was created despite no principals being specified."
+    }
+
+    assert {
+      condition     = length(data.aws_iam_policy_document.default_write_access_repo_policy) == 0
+      error_message = "Default write-access policy document was created despite no principals being specified."
+    }
+}
+
+run "combined_policy_created_when_either_principal_specified" {
+    command = plan
+
+    variables  {
+        domain_name = "test-domain"
+        repositories = [
+        {
+            repository_name                 = "repo-with-read-policy"
+            default_read_access_principals  = ["arn:aws:iam::123456789012:role/ReadRole"]
+        },
+        {
+            repository_name                 = "repo-with-write-policy"
+            default_write_access_principals = ["arn:aws:iam::123456789012:role/WriteRole"]
+        }
+        ]
+    }
+
+    assert {
+      condition     = length(data.aws_iam_policy_document.combined_default_policies) == 2
+      error_message = "Combined default policies were not created correctly when either read or write principals were specified."
+    }
+}
+
+run "no_combined_policy_when_no_principals" {
+    command = plan
+
+    variables  {
+        domain_name = "test-domain"
+        repositories = [
+        {
+            repository_name = "repo-without-policies"
+        }
+        ]
+    }
+
+    assert {
+      condition     = length(data.aws_iam_policy_document.combined_default_policies) == 0
+      error_message = "Combined default policy was created despite no principals being specified."
+    }
+}
+
+run "policy_file_should_override_default_policy" {
+    command = plan
+
+    variables  {
+        domain_name = "test-domain"
+        repositories = [
+        {
+            repository_name      = "repo-with-policy-file"
+            policy_document_path = "tests/test-repo-policy.json"
+            default_read_access_principals  = ["arn:aws:iam::123456789012:role/ReadRole"]
+        }
+        ]
+    }
+
+    assert {
+      condition     = length(aws_codeartifact_repository_permissions_policy.repo_permissions_policy) == 1
+      error_message = "Repository permissions policy was not created when a policy document path was provided."
+    }
+}
\ No newline at end of file
diff --git a/codeartifact-repo/variables.tf b/codeartifact-repo/variables.tf
index 4a7b6a3..c5a8b1d 100644
--- a/codeartifact-repo/variables.tf
+++ b/codeartifact-repo/variables.tf
@@ -50,13 +50,15 @@ variable "domain_permissions_policy_revision" {
 
 variable "repositories" {
   type = list(object({
-    repository_name      = string
-    description          = optional(string, "")
-    region               = optional(string, null)
-    domain_owner         = optional(string, null)
-    upstream             = optional(string, null)
-    external_connection  = optional(string, null)
-    policy_document_path = optional(string, null)
+    repository_name                 = string
+    description                     = optional(string, "")
+    region                          = optional(string, null)
+    domain_owner                    = optional(string, null)
+    upstream                        = optional(string, null)
+    external_connection             = optional(string, null)
+    policy_document_path            = optional(string, null)
+    default_read_access_principals  = optional(list(string), null)
+    default_write_access_principals = optional(list(string), null)
   }))
   description = "List of repositories within Codeartifact domain"
   default     = []
diff --git a/scripts/format.sh b/scripts/format.sh
index 04d721f..fea120e 100755
--- a/scripts/format.sh
+++ b/scripts/format.sh
@@ -5,6 +5,7 @@ GOPATH=$(go env GOPATH)
 echo "Formatting files..."
 
 echo "Adding license headers..."
+echo "dir: $(pwd)"
 $GOPATH/bin/addlicense -c 'Bitshift' -y 2025 -l mpl -s=only ./*.tf || exit 1
 cd tests && $GOPATH/bin/addlicense -check -c 'Bitshift' -y 2025 -l mpl -s=only ./*.tftest.hcl || exit 1
 cd ..
@@ -14,3 +15,7 @@ echo "License headers added successfully"
 echo "Running Terraform format..."
 terraform fmt  || exit 1
 echo "Terraform formatting successfull"
+
+echo "Generating terraform docs..."
+terraform-docs -c ../.terraform-docs.yaml . || exit 1
+echo "Terraform docs generated successfully"