Add prompt-snippets plugin with /ps command (#7)

* Add prompt-snippets plugin with /ps command

New plugin provides quick behavioral mode switches via a single
dispatcher skill. /ps noaction, /ps brief, /ps go, etc. inject
short directives that persist for the conversation. Snippets are
composable (/ps noaction brief) and isolated from skill-engine
auto-suggestion.

* Fix 3 issues from CodeRabbit review

- Add prompt-snippets to Plugins list in CLAUDE.md
- Add `text` language specifier to fenced code blocks (MD040) in README.md and SKILL.md

---------

Co-authored-by: AnExiledDev <AnExiledDev@users.noreply.github.com>

Author: AnExiledDev

.devcontainer/CHANGELOG.md

@@ -71,6 +71,14 @@
 
 ## [v1.14.2] - 2026-02-24
 
+### Added
+
+#### Prompt Snippets Plugin
+- **New plugin: `prompt-snippets`** — single `/ps` slash command for quick behavioral mode switches (noaction, brief, plan, go, review, ship, deep, hold, recall, wait)
+- Snippets inject short directives that persist for the conversation (e.g., `/ps noaction` → "Investigate and report only. Take no action.")
+- Composable: `/ps noaction brief` applies multiple snippets at once
+- Isolated from skill-engine auto-suggestion (`disable-model-invocation: true`) and independently toggleable via `enabledPlugins`
+
 ### Changed
 
 #### Docs

.devcontainer/CLAUDE.md

@@ -91,6 +91,7 @@ Declared in `settings.json` under `enabledPlugins`, auto-activated on start:
 - **ticket-workflow** — EARS ticket workflow + auto-linking
 - **notify-hook** — Desktop notifications on completion
 - **frontend-design** (Anthropic official) — UI/frontend design skill
+- **prompt-snippets** — Quick behavioral mode switches via /ps command
 
 ## Rules System
 

.devcontainer/config/defaults/settings.json

@@ -64,7 +64,8 @@
 		"spec-workflow@devs-marketplace": true,
 		"session-context@devs-marketplace": true,
 		"auto-code-quality@devs-marketplace": true,
-		"workspace-scope-guard@devs-marketplace": true
+		"workspace-scope-guard@devs-marketplace": true,
+		"prompt-snippets@devs-marketplace": true
 	},
 	"autoUpdatesChannel": "latest"
 }

.devcontainer/plugins/devs-marketplace/.claude-plugin/marketplace.json

@@ -97,6 +97,14 @@
 			"source": "./plugins/workspace-scope-guard",
 			"category": "safety",
 			"keywords": ["safety", "scope", "workspace"]
+		},
+		{
+			"name": "prompt-snippets",
+			"description": "Quick behavioral mode switches via /ps command",
+			"version": "1.0.0",
+			"source": "./plugins/prompt-snippets",
+			"category": "productivity",
+			"keywords": ["snippets", "prompts", "modes", "shortcuts"]
 		}
 	]
 }

.devcontainer/plugins/devs-marketplace/plugins/prompt-snippets/.claude-plugin/plugin.json

@@ -0,0 +1,5 @@
+{
+	"name": "prompt-snippets",
+	"description": "Quick behavioral mode switches via /ps command.",
+	"author": { "name": "AnExiledDev" }
+}

.devcontainer/plugins/devs-marketplace/plugins/prompt-snippets/README.md

@@ -0,0 +1,52 @@
+# Prompt Snippets Plugin
+
+Quick behavioral mode switches via a single `/ps` slash command.
+
+## Usage
+
+```text
+/ps [snippet-name]
+```
+
+Type `/ps` followed by a snippet name to inject a behavioral directive for the remainder of the conversation.
+
+### Available Snippets
+
+| Snippet | What it does |
+|---------|-------------|
+| `noaction` | Investigate and report only — no edits, no commands |
+| `brief` | Concise answers, no filler |
+| `plan` | Plan first, don't implement until approved |
+| `go` | Proceed without confirmation prompts |
+| `review` | Audit only — report findings, don't modify |
+| `ship` | Commit, push, and create a PR |
+| `deep` | Thorough investigation, leave no stone unturned |
+| `hold` | Do the work but don't commit or push |
+| `recall` | Search session history with ccms for prior context |
+| `wait` | When done, stop — no suggestions or follow-ups |
+
+### Composing
+
+Combine snippets by listing multiple names:
+
+```text
+/ps noaction brief
+```
+
+## Design
+
+This plugin contains a single skill (`/ps`) that uses `$ARGUMENTS` as a lookup key into a snippet table. It is:
+
+- **Not auto-suggested** — `disable-model-invocation: true` keeps it out of the skill engine's auto-suggestion system
+- **Independently toggleable** — disable via `enabledPlugins` in `settings.json` without affecting other skills
+- **Extensible** — add a row to the table in `skills/ps/SKILL.md` to create new snippets
+
+## Adding Custom Snippets
+
+Edit `skills/ps/SKILL.md` and add a row to the "Available Snippets" table:
+
+```markdown
+| `mysnippet` | Your custom instruction here. |
+```
+
+No other files need to change.

.devcontainer/plugins/devs-marketplace/plugins/prompt-snippets/skills/ps/SKILL.md

@@ -0,0 +1,37 @@
+---
+name: ps
+description: Inject a behavioral prompt snippet by name.
+disable-model-invocation: true
+argument-hint: "[snippet-name]"
+---
+
+# /ps — Prompt Snippets
+
+Apply the prompt snippet matching `$ARGUMENTS` from the table below. Follow its instruction for the **remainder of this conversation** unless the user explicitly overrides it.
+
+If `$ARGUMENTS` does not match any snippet name, list all available snippets and ask the user to pick one.
+
+## Available Snippets
+
+| Snippet | Instruction |
+|---------|-------------|
+| `noaction` | Investigate and report only. Take no action — no edits, no commands, no file writes. |
+| `brief` | Be concise. Short answers, no filler, no preamble. Answer the question and stop. |
+| `plan` | Build a plan before taking any action. Do not implement until the plan is explicitly approved. |
+| `go` | Proceed without asking for confirmation. Use your best judgment on all decisions. |
+| `review` | Review and audit only. Report findings with specific file paths and line numbers. Do not modify anything. |
+| `ship` | Commit all staged changes, push to remote, and create a pull request. |
+| `deep` | Be thorough and comprehensive. Investigate in depth, consider edge cases, leave no stone unturned. |
+| `hold` | Complete the current task but do not commit, push, or publish. Await my review before any git operations. |
+| `recall` | Search past session history with `ccms --no-color --project "$(pwd)"` to find prior decisions, discussions, and context relevant to the current task. Summarize what you find before proceeding. |
+| `wait` | When done, stop. Do not suggest next steps, ask follow-up questions, or continue with related work. Await further instructions. |
+
+## Composing Snippets
+
+Multiple snippets can be applied in one invocation by separating names with spaces:
+
+```text
+/ps noaction brief
+```
+
+Apply all matching snippets. If instructions conflict, the **last snippet wins** for that specific behavior.