docs: document summary definitions on custom attestation types

administration/managing_custom_attestation_types/overview.md

@@ -1,6 +1,6 @@
 ---
 title: Managing Custom Attestation Types
-description: Learn how to manage Kosli custom attestation types via Terraform, including creating and importing types with JSON Schema and jq evaluation rules.
+description: Learn how to manage Kosli custom attestation types via Terraform, including creating and importing types with JSON Schema, jq evaluation rules, and summaries.
 ---
 
 The preferred way to manage custom attestation types is via the <Tooltip tip="An official HashiCorp-registered Terraform provider that lets you manage Kosli resources (environments, flows, policies, etc.) as infrastructure as code." cta="View on Terraform Registry" href="https://registry.terraform.io/providers/kosli-dev/kosli/latest/docs/">Kosli Terraform provider</Tooltip>, so your Kosli configuration is version-controlled alongside your infrastructure. You can also manage custom attestation types through the Kosli CLI.
@@ -13,8 +13,12 @@ Custom attestation types define how Kosli validates evidence from tools that don
 
 - A **JSON Schema** (optional) that defines the expected structure of attestation data
 - **jq rules** (optional) that evaluate the data to determine compliance
+- A **summary** (optional) — ordered, labeled jq expressions that Kosli renders as rows on the attestation detail page
 
-At least one of the two must be provided.
+At least one of the schema or the jq rules must be provided. The summary is independent of both:
+it only affects how attestations of the type are displayed, never whether they are compliant. See
+[Summarizing custom attestations](/getting_started/attestations#summarizing-custom-attestations) for
+how summaries render.
 
 ## Create a custom attestation type
 
@@ -72,6 +76,43 @@ resource "kosli_custom_attestation_type" "deployment_record" {
 }
 ```
 
+### With a summary
+
+`summary` takes a JSON array of `{name, expression}` objects. Each expression is a jq expression
+evaluated against the attestation data when the attestation is displayed, and the entries render in
+the order given. A string value beginning with `http://` or `https://` renders as a clickable link.
+
+```hcl
+resource "kosli_custom_attestation_type" "vulnerability_scan" {
+  name        = "vulnerability-scan"
+  description = "Validates vulnerability scan results"
+
+  jq_rules = [".critical_vulnerabilities == 0"]
+
+  summary = jsonencode([
+    { name = "Critical", expression = ".critical_vulnerabilities" },
+    { name = "High", expression = ".high_vulnerabilities" },
+    { name = "Scanner", expression = ".scanner_version" },
+    { name = "Report", expression = ".report_url" },
+  ])
+}
+```
+
+Use `file()` instead of `jsonencode()` to keep the summary in a standalone JSON file, so the same
+definition can be shared with other tooling:
+
+```hcl
+summary = file("${path.module}/summaries/vulnerability-scan.json")
+```
+
+<Note>
+The summary is part of the versioned type definition, so changing it creates a new version of the
+attestation type — exactly like changing the schema or the jq rules. Removing `summary` from a type
+that had one clears the summary on the new version, so attestations reported against it fall back to
+showing the jq evaluation results as a pass/fail checklist. Attestations reported against an earlier
+version keep the summary that version defined.
+</Note>
+
 ## Import an existing custom attestation type
 
 If you have custom attestation types created via the CLI, you can bring them under Terraform management by importing them into your <Tooltip tip="The Terraform state file tracks the mapping between your configuration and real-world resources. Importing adds an existing resource to this state without recreating it.">Terraform state</Tooltip>.

getting_started/attestations.md

@@ -329,15 +329,15 @@ Currently, we support the following types of evidence:
     You could create a custom attestation type called `coverage-metrics` using a [jq expression](https://jqlang.org/manual/) rule defining a minimum line coverage of 95%:
 
     ```bash
-    kosli create attestation-type coverage-metrics
+    kosli create attestation-type coverage-metrics \
       --jq=".code.lines.missed / .code.lines.total * 100 <= 5"
     ```
 
     You could then make your custom attestation with the json file:
     ```bash
-    kosli attest custom
-      --type=coverage-metrics
-      --attestation-data=unit-test-coverage.json
+    kosli attest custom \
+      --type=coverage-metrics \
+      --attestation-data=unit-test-coverage.json \
       ...
     ```
 
@@ -349,6 +349,10 @@ Currently, we support the following types of evidence:
     - So `32 / 1209 * 100 <= 5` evaluates to `2.64 <= 5` which is `true`
 
 
+    A custom attestation type can also define a **summary**, so that attestations of the type show
+    named values from their data instead of only raw JSON. See
+    [Summarizing custom attestations](#summarizing-custom-attestations) below.
+
     See:
     * [create custom attestation type](/client_reference/kosli_create_attestation-type) and
     * [report custom attestation to an artifact or a trail](/client_reference/kosli_attest_custom/) for usage details and examples.
@@ -364,3 +368,56 @@ Currently, we support the following types of evidence:
   </Accordion>
 </AccordionGroup>
 
+## Summarizing custom attestations
+
+By default, the attestation detail page in Kosli shows a custom attestation type's evaluation rules
+as a pass/fail checklist, plus the raw attestation data. Add a **summary** to the type to pull named
+values out of the attestation data and display them as labeled rows instead — the way the built-in
+Sonar, Snyk and JUnit attestations do.
+
+A summary is an ordered list of `name`/`expression` pairs, where each expression is a
+[jq expression](https://jqlang.org/manual/) evaluated against the attestation data. Add one entry
+per `--summary` flag:
+
+```bash
+kosli create attestation-type coverage-metrics \
+  --jq=".code.lines.missed / .code.lines.total * 100 <= 5" \
+  --summary="Lines missed=.code.lines.missed" \
+  --summary="Lines total=.code.lines.total"
+```
+
+Attestations of the `coverage-metrics` type then show `Lines missed` and `Lines total`, in that
+order, with the values taken from each attestation's own data. Re-running `kosli create
+attestation-type` for a name that already exists updates that type rather than creating a second
+one — see the note on versioning below.
+
+Each `--summary` value is split on its first `=` only, so `==` inside a jq expression is safe. Use
+[`--summary-json`](/client_reference/kosli_create_attestation-type) instead if the list is easier to
+express as JSON, or the
+[`summary` attribute](/terraform-reference/resources/custom_attestation_type) if you manage your
+types with Terraform:
+
+```json
+[
+  { "name": "Lines missed", "expression": ".code.lines.missed" },
+  { "name": "Lines total", "expression": ".code.lines.total" }
+]
+```
+
+Worth knowing:
+
+- The summary is part of the **versioned** type definition. Changing it creates a new version of the
+  type, just like changing the schema or the evaluation rules. Each attestation is displayed using
+  the version of the type it was reported against, so editing a summary does not change how existing
+  attestations render.
+- Expressions are evaluated when the attestation is **displayed**, against the stored attestation
+  data. A summary never affects the compliance status of an attestation.
+- Invalid jq is rejected when the type is created, so authoring mistakes surface immediately rather
+  than as a broken detail page later.
+- An expression that returns `null`, or that fails against a particular attestation's data, renders
+  as `N/A`. The rest of the summary still renders.
+- A value that is a string beginning with `http://` or `https://` renders as a clickable link, as
+  [annotation values](#annotating-attestations) do. Other values render as text.
+- If the attestation data is a top-level array, Kosli renders one summary group per element
+  (`Summary 1:`, `Summary 2:`, and so on). Write the expressions against a single element
+  (`.code.lines.missed`) — each element is evaluated separately.

tutorials/attest_custom.md

@@ -22,14 +22,20 @@ Before you can report a custom attestation, the type referenced by `--type` must
 * **CLI** — [`kosli create attestation-type`](/client_reference/kosli_create_attestation-type) (good for quick experiments).
 * **Terraform** — the [`kosli_custom_attestation_type` resource](/terraform-reference/resources/custom_attestation_type) (recommended so the type is version-controlled).
 
-For this tutorial we'll create a minimal `coverage-report` type that requires a `coverage` field of at least 80:
+For this tutorial we'll create a small `coverage-report` type that requires a `coverage` field of at least 80:
 
 ```shell
 kosli create attestation-type coverage-report \
   --description "Code coverage report" \
-  --jq '.coverage >= 80'
+  --jq '.coverage >= 80' \
+  --summary "Coverage=.coverage" \
+  --summary "Tool=.tool"
 ```
 
+The `--summary` entries are optional. Each is a `'NAME=EXPRESSION'` pair, so the attestation you
+report below opens on a readable `Coverage: 92` / `Tool: pytest-cov` summary instead of raw JSON —
+see [Summarizing custom attestations](/getting_started/attestations#summarizing-custom-attestations).
+
 Prepare a JSON file with the data you want to attest. Save it as `coverage.json`:
 
 ```json