slash-prompt

appgardenstudios/slash-prompt

3.2

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The Model Context Protocol (MCP) server facilitates the sharing and management of prompts for language models.

/prompt

A Model Context Protocol (MCP) server that allows people to share prompts and resources.

Features

  • Share Prompts and Resources: Use shared prompts and resources in any tool that supports MCP
  • Backed By Git: Load prompts and resources directly from public or private Git repositories
  • Multiple Repository Support: Support for multiple repositories with custom paths and patterns
  • Argument Substitution: Dynamic prompt templates with variable substitution
  • Embedded Prompt Resources: Embed resources in prompts

Quick Start

  1. Create a git repository with prompts and resources.
  2. Create a configuration file.
  3. Install the MCP server.
  4. Start using /prompt with your AI assistant.

Prompts

Prompts are Markdown files with YAML frontmatter. Example:

---
name: load-documentation
description: Use hyaline to load relevant documentation into context
arguments:
  - name: task
    description: A description of the task being performed
    required: true
resources:
  - path: ../resources/documentation-summary.template.md
    name: documentation-summary-template
---

Based on the following task, use the hyaline MCP server to get relevant documentation.

Task: ${task}

Use the provided documentation-summary-template to summarize the documentation that was retrieved.

Frontmatter Fields

The YAML frontmatter supports the following fields:

  • name (string, optional): Name of the prompt. Defaults to the filename without extension.
  • description (string, optional): Description of what the prompt does.
  • arguments (array, optional): Arguments the prompt accepts.
    • name (string, required): Argument name.
    • description (string, optional): Argument description.
    • required (boolean, optional): Whether the argument is required. Defaults to false.
  • resources (array, optional): Resources to embed in the prompt.
    • path (string, required): Path to the resource file (relative to the prompt file).
    • name (string, optional): Resource name. Defaults to the filename.
    • mimeType (string, optional): MIME type. Auto-detected if not specified.

Configuration

/prompt is configured by a YAML file. Example:

repos:
  - repo: https://github.com/appgardenstudios/hyaline.git
    id: hyaline
    ref: main
    prompts:
      include:
        - "contributing/prompts/**/*.md"
      exclude:
        - "contributing/prompts/resources/**/*"
    resources:
      include:
        - "contributing/prompts/resources/**/*.template.md"

Configuration Options

  • repos (array, required): List of one or more repositories to load prompts and resources from.
    • repo (string, required): Git repository URL (HTTPS only).
    • id (string, optional): Unique identifier for the repository. Must match the regex ^[A-Za-z0-9_-]+$. Defaults to repository name.
    • ref (string, optional): Git branch, tag, or commit to use. Using a commit hash is strongly recommended to mitigate supply chain attacks. Defaults to the repository's default branch.
    • auth (object, optional): Authentication configuration for private repositories.
      • username (string, required if auth specified): Username for authentication.
      • password (string, required if auth specified): Password or personal access token.
    • prompts (object, optional): Configuration for prompt files.
      • include (array, optional): Glob patterns for files to include. Defaults to ["**/*.md"].
      • exclude (array, optional): Glob patterns for files to exclude.
    • resources (object, optional): Configuration for resource files.
      • include (array, optional): Glob patterns for files to include. Defaults to ["**/*.md"].
      • exclude (array, optional): Glob patterns for files to exclude.

Notes:

  • Glob pattern matching is powered by doublestar.
  • For private repositories, create a personal access token with read-only permissions and provide it as the password.
  • SSH authentication is not supported intentionally due to the difficulty of implementing fine-grained access control with SSH keys. If you believe SSH support should be added, please reach out.

Environment Variable Substitution

Configuration files support environment variable substitution using ${VARIABLE_NAME} syntax. This allows you to keep sensitive information like credentials out of your configuration files.

Example:

repos:
  - repo: https://github.com/appgardenstudios/hyaline.git
    id: hyaline
    ref: main
      username: ${SLASH_PROMPT_USERNAME}
      password: ${SLASH_PROMPT_PASSWORD}
    prompts:
      path: contributing/prompts
      include:
        - "**/*.md"
      exclude:
        - "resources/**/*"

Installation

Docker

The MCP server is run as a docker container over STDIO, and so Docker is a prerequisite. When running the docker container, the configuration file must be mounted.

Example:

$ docker run -i --rm -v ./prompt.yml:/home/appuser/.prompt.yml:ro ghcr.io/appgardenstudios/slash-prompt:latest

The default location for the mounted configuration file is /home/appuser/.prompt.yml; however, this can be overridden by providing a SLASH_PROMPT_CONFIG_PATH environment variable.

See https://github.com/appgardenstudios/slash-prompt/pkgs/container/slash-prompt for the list of available images.

Host Applications

Installation varies depending on the host application. Refer to the current documentation for your specific host application.

Claude Code

Install the MCP server using the Claude Code CLI:

claude mcp add prompt -- docker run -i --rm -v ./prompt.yml:/home/appuser/.prompt.yml:ro ghcr.io/appgardenstudios/slash-prompt:latest
Claude Desktop

Add the following configuration to your claude_desktop_config.json:

{
  "mcpServers": {
    "prompt": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "-v", "./prompt.yml:/home/appuser/.prompt.yml:ro",
        "ghcr.io/appgardenstudios/slash-prompt:latest"
      ]
    }
  }
}

Usage

MCP Tools

The following MCP tools are available:

  • listErrors: List all loading errors that occurred during startup
  • listResources: List all available resources, optionally filtered by repository
    • repo (optional): Repository filter
  • getResource: Get a specific resource by its URI
    • resource_uri (required): The fully qualified resource URI. See MCP Resources

MCP Prompts

Host applications expose prompts in different ways. Refer to the current documentation for your specific host application.

Prompts can be accessed by name (when they are unique) or with a repository ID prefix:

  • generate-spec - Access the "generate-spec" prompt
  • hyaline:analyze - Access the "analyze" prompt specifically from the "hyaline" repository

In Claude Code:

/prompt:load-documentation

MCP Resources

Resources are available through the MCP resource system. Resource URIs follow the schema file://<repo-id>/<path-to-resource>. Example: file://hyaline/contributing/resources/documentation-summary.template.md

Resources that are referenced by prompt files are automatically embedded in the prompt. They can also be retrieved using the provided resource tools.

Host applications expose prompts in different ways. Refer to the current documentation for your specific host application.

In Claude Code:

@prompt:file://hyaline/contributing/prompts/resources/spec.template.md

Development

Prerequisites

  • Go 1.24.4 or later
  • Git
  • Docker (optional)

Building

Build the Docker image:

$ make build-docker

Testing

Unit Tests

Run unit tests:

$ make test
E2E Tests

Run end-to-end tests:

$ make e2e

Update E2E golden files:

$ make e2e-update
Manual Testing with Claude Code

For local development and testing:

  1. Build a local Docker image: 
    $ make build-docker
  2. Set the SLASH_PROMPT_IMAGE environment variable to use your local image: 
    $ export SLASH_PROMPT_IMAGE=slash-prompt:development
  3. The .mcp.json file is configured to use this environment variable, allowing you to test with your local build using Claude Code.
    • Note: Due to a current bug with Claude Code, you must inline the environment variable: 
      $ SLASH_PROMPT_IMAGE=slash-prompt:development claude

Documentation

This project uses Hyaline to help keep documentation updated.

Releasing

The release process is automated with the release script. It must be run from the main branch:

$ ./scripts/release.sh

License

This project is licensed under the terms of the MIT open source license. Please refer to for the full terms.

Support