feat(ai-chat): wire llms.txt docs lookup tools into global chat mode

Add list_docs_pages/read_docs_page to globalTools and a docs system-prompt section so the workspace assistant can answer product questions from windmill.dev docs and cite canonical URLs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

ai_evals/cases/global.yaml

@@ -870,3 +870,27 @@
   judgeChecklist:
     - fetches the logs for the requested job id
     - explains the failure from the returned logs (connection refused to the upstream API)
+
+- id: global-test29-docs-lookup-scheduling
+  prompt: |-
+    How do I schedule a script to run every Monday at 9am in Windmill?
+  runtime:
+    maxTurns: 6
+  validate:
+    draftCountExactly: 0
+  toolExpect:
+    requiredToolsUsed:
+      - list_docs_pages
+      - read_docs_page
+    forbiddenToolsUsed:
+      - deploy_workspace_item
+      - delete_workspace_item
+      - write_script
+  # Answering a product-docs question produces no draft, so the global judge
+  # (which only sees the drafts artifact) would score it empty — validate the
+  # docs-lookup contract via tool use: browse the index first, then read a page.
+  skipJudge: true
+  judgeChecklist:
+    - lists the documentation pages before reading one
+    - reads the scheduling documentation page rather than answering from memory
+    - cites the canonical windmill.dev/docs scheduling URL in the answer

frontend/src/lib/components/copilot/chat/global/core.test.ts

@@ -2020,6 +2020,25 @@ describe('session-only preview tools gating', () => {
 	})
 })
 
+describe('documentation lookup tools', () => {
+	it('exposes list_docs_pages and read_docs_page in both the session and non-session tool sets', () => {
+		// The docs tools are read-only references, not session-preview tools, so
+		// they must be present regardless of `sessionPreview`.
+		for (const sessionPreview of [false, true]) {
+			const names = globalToolsFor({ sessionPreview }).map((t) => t.def.function.name)
+			expect(names).toContain('list_docs_pages')
+			expect(names).toContain('read_docs_page')
+		}
+	})
+
+	it('instructs the model to look up product docs and cite the Source page URL', () => {
+		const content = prepareGlobalSystemMessage().content as string
+		expect(content).toContain('list_docs_pages')
+		expect(content).toContain('read_docs_page')
+		expect(content).toContain('Source page')
+	})
+})
+
 describe('prepareGlobalUserMessage', () => {
 	it('injects the active editor reference without contents', () => {
 		__resetUserDraftForTesting()

frontend/src/lib/components/copilot/chat/global/core.ts

@@ -74,6 +74,7 @@ import {
 } from '../shared'
 import type { ContextElement } from '../context'
 import { getDatatableTools } from '../datatableTools'
+import { listDocsPagesTool, readDocsPageTool } from '../docs/core'
 import { UserDraft, type UserDraftMeta } from '$lib/userDraft.svelte'
 import { emptySchema } from '$lib/utils'
 import { inferArgs } from '$lib/infer'
@@ -639,6 +640,12 @@ Rules:
 		: ''
 	}
 
+Documentation:
+- To answer questions about Windmill product features, concepts, or syntax, look them up in the official docs with list_docs_pages and read_docs_page rather than relying on memory.
+- Call list_docs_pages FIRST to see the full index of documentation pages with their titles, URLs and descriptions. Then call read_docs_page on the 1 to 3 most relevant pages. If read_docs_page returns a list of section headings instead of the full page, call it again with the same path and a \`section\` argument to read the relevant section.
+- Base documentation answers ONLY on what you read. Do not invent features, flags, syntax, or behavior you did not see in the docs.
+- When you cite a docs page, use the exact "Source page" URL printed at the top of each read_docs_page result — never reconstruct a URL from a link inside the page body. If the docs do not cover the question, say so rather than inventing an answer.
+
 Flows:
 - read_workspace_item returns compact flow JSON. Inline script bodies appear as "inline_script.<moduleId>".
 - Use read_flow_module_code and set_flow_module_code for inline script bodies.
@@ -1469,6 +1476,8 @@ export const globalTools: Tool<{}>[] = [
 		}
 	},
 	createSearchHubScriptsTool(false),
+	listDocsPagesTool,
+	readDocsPageTool,
 	{
 		def: createToolDef(
 			askUserQuestionSchema,