UI Verify

Page through the PR-vs-base changeset by kind

list_pr_stories

Read-only

Page through the PR-vs-base changeset stories of one kind (resolved by commitSha/prNumber/buildId) - use it to read past get_pr_changeset's first page. kind='new' returns stories the PR adds that the base branch has no baseline for; kind='changed' returns stories whose image differs from the base branch's accepted image (even if accepted mid-PR, with status=accepted); kind='removed' returns stories that HAD a baseline on the base branch but are gone from head (a deletion; each carries lastBuildId, not a review status or verdict). Returns { stories, nextCursor }: pass nextCursor back as cursor for the next page; null means no more. limit defaults to 25 (max 100). Requires the PR visual changeset feature.

Input Schema

TableJSON Schema

Name	Required	Description
`kind`	Yes	Which changeset stories to page: new (added), changed (vs base), or removed (deleted).
`limit`	No	Page size (default 25, max 100).
`cursor`	No	The nextCursor from a prior page; omit for the first page.
`buildId`	No	Resolve this exact build id.
`prNumber`	No	Resolve the latest build for this PR number.
`commitSha`	No	Resolve the build for this git commit SHA.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`stories`	Yes
`nextCursor`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 5, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "nextCursor": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "stories": {
+      "items": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "aiConfidence": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "aiVerdict": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "browsers": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "kind": {
+                "enum": [
+                  "new",
+                  "changed"
+                ],
+                "type": "string"
+              },
+              "name": {
+                "type": "string"
+              },
+              "status": {
+                "enum": [
+                  "accepted",
+                  "denied",
+                  "ignored",
+                  "pending"
+                ],
+                "type": "string"
+              },
+              "storyId": {
+                "type": "string"
+              },
+              "title": {
+                "type": "string"
+              },
+              "unstable": {
+                "type": "boolean"
+              },
+              "viewports": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              }
+            },
+            "required": [
+              "storyId",
+              "title",
+              "name",
+              "kind",
+              "status",
+              "browsers",
+              "viewports",
+              "aiVerdict",
+              "aiConfidence",
+              "unstable"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "browsers": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "lastBuildId": {
+                "format": "uuid",
+                "type": "string"
+              },
+              "name": {
+                "type": "string"
+              },
+              "storyId": {
+                "type": "string"
+              },
+              "title": {
+                "type": "string"
+              },
+              "viewports": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              }
+            },
+            "required": [
+              "storyId",
+              "title",
+              "name",
+              "lastBuildId",
+              "browsers",
+              "viewports"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "stories",
+    "nextCursor"
+  ],
+  "type": "object"
+}

First observedSep 5, 2026

TDQS

A4.9/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The annotations already declare readOnlyHint=true and openWorldHint=false, and the description adds meaningful behavior: exact semantics of new/changed/removed, that removed stories carry lastBuildId rather than review status/verdict, the cursor round-trip contract, and the default/max limit. No statement contradicts the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is information-dense but every clause earns its place: pagination role, kind semantics, output shape, cursor handling, limit, and feature gate. It is front-loaded with the core action and routing hint before the detailed kind definitions.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 6-parameter paging tool, the description plus the provided schema and output schema cover resolution modes, pagination state, return shape, defaults, and prerequisites. An agent has what it needs to call the tool correctly and continue paging.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3; the description goes beyond the schema by defining what each kind means (e.g., 'even if accepted mid-PR, with status=accepted') and how cursor pagination works. It does not fully remove ambiguity about whether exactly one of commitSha/prNumber/buildId must be supplied, which keeps it from a 5.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb ('Page through'), a precise resource ('PR-vs-base changeset stories'), and a kind selector, then immediately ties it to the sibling tool: 'read past get_pr_changeset's first page'. Each kind value gets a distinct semantic definition, so an agent can tell this apart from get_pr_changeset and list_build_stories without opening schemas.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It explicitly names get_pr_changeset as the tool whose first-page result this continues, giving the when-condition ('read past ... first page'). It also states the prerequisite ('Requires the PR visual changeset feature'), which prevents calls in unsupported contexts.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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