add savePrompt prompt (#1715)

Author: aeschli

assets/agents/Plan.agent.md

@@ -1,4 +1,5 @@
 ---
+name: Plan
 description: Researches and outlines multi-step plans
 argument-hint: Outline the goal or problem to research
 tools: ['search', 'github/github-mcp-server/get_issue', 'github/github-mcp-server/get_issue_comments', 'runSubagent', 'usages', 'problems', 'changes', 'testFailure', 'fetch', 'githubRepo', 'github.vscode-pull-request-github/issue_fetch', 'github.vscode-pull-request-github/activePullRequest']
@@ -8,7 +9,7 @@ handoffs:
     prompt: Start implementation
   - label: Open in Editor
     agent: agent
-    prompt: Save the plan to a markdown file, as is
+    prompt: Save the resulting plan in a untitled file with URI `untitled:${promptFileName}.prompt.md`, where `${promptFileName}` can use letters, digit, underscores, hyphens, and periods. Add a frontmatter with `name` and `description`
 ---
 You are a PLANNING AGENT, NOT an implementation agent.
 

assets/prompts/savePrompt.prompt.md

@@ -0,0 +1,26 @@
+---
+name: savePrompt
+description: Generalize the current discussion into a reusable prompt and save it as a file
+---
+Generalize the current discussion into a reusable prompt that can be applied in similar contexts.
+
+Think step by step:
+1. Review the conversation to identify the user's primary goal or task pattern
+2. Generalize the task into a reusable prompt that could apply to similar scenarios
+3. Extract the core intent, removing conversation-specific details (e.g., specific file names, variable names, or project-specific context)
+4. Craft the generalized multi-line markdown text prompt, using placeholders where appropriate (e.g., "the selected code", "the current file", "the specified functionality")
+5. Create a very concise action-oriented title in camelCase format that will be used for the slash command (1-3 words, e.g., "generateUnitTests", "refactorForPerformance", "explainApiDesign", etc)
+6. Write a brief description (1 sentence, max 15 words) explaining the goal of the prompt
+7. If applicable, define an argument-hint that describes the expected inputs for the prompt
+8. Save the resulting prompt in a untitled file with URI `untitled:${promptFileName}.prompt.md`, where `${promptFileName}` is the concise action-oriented title from step 5
+
+Here's an example of the expected output format:
+```
+---
+name: ${The concise title in kebab-case format. You can only use letters, digits, underscores, hyphens, and periods}
+description: ${A brief description (1 sentence) explaining the goal of the prompt}
+argument-hint: ${A description of the expected inputs for the prompt, if any}
+---
+${The generalized multi-line markdown text prompt}
+```
+

package.json

@@ -4247,6 +4247,13 @@
 				"path": "./assets/agents/Plan.agent.md",
 				"description": "Researches a task to create multi-step plans"
 			}
+		],
+		"prompts": [
+			{
+				"name": "savePromptFile",
+				"path": "./assets/prompts/savePromptFile.prompt.md",
+				"description": "Generalize the current discussion into a reusable prompt and save it as a file"
+			}
 		]
 	},
 	"extensionPack": [