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feat(cartridge): add fireflag-mcp (extension-to-MCP mapping)
- Idris2 ABI with extension types (VSCode, IDE, CLI, LSP, web, desktop, other) - Zig FFI with 6 exported functions (map_extension, list_mapped_extensions, get_extension_tools, validate_extension, discover_extensions, get_extension_type) - Deno MCP adapter exposing extension mapping tools on ws://127.0.0.1:5177 - Loopback proof pinning: IsLoopback 5177 - Supports discovery, validation, and capability enumeration for extensions Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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‎cartridges/fireflag-mcp/.editorconfig‎

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# SPDX-License-Identifier: PMPL-1.0-or-later
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root = true
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[*]
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charset = utf-8
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indent_style = space
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indent_size = 2
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end_of_line = lf
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trim_trailing_whitespace = true
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insert_final_newline = true
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[*.md]
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trim_trailing_whitespace = false

‎cartridges/fireflag-mcp/.gitignore‎

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// SPDX-License-Identifier: PMPL-1.0-or-later
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*.swp
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*.swo
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*~
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.DS_Store
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node_modules/
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dist/
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build/
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target/
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.deno
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deno.lock

‎cartridges/fireflag-mcp/LICENSE‎

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SPDX-License-Identifier: PMPL-1.0-or-later
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Fireflag Cartridge
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Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath)
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This software is licensed under the PMPL-1.0-or-later license.
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PMPL-1.0-or-later is a license supporting dual licensing with MPL-2.0 as automatic fallback.
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For the full license text, see: https://hyperpolymath.dev/standards/PMPL-1.0
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Legal Notice:
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Until PMPL achieves formal recognition as a standalone license, this software is
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automatically operative under the Mozilla Public License 2.0 (MPL-2.0).
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This is a legal fallback arrangement confirmed by legal counsel.

‎cartridges/fireflag-mcp/README.adoc‎

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= Fireflag Cartridge
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:toc: preamble
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:author: Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
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:date: 2026-04-25
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:spdx: PMPL-1.0-or-later
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// SPDX-License-Identifier: PMPL-1.0-or-later
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Extension-to-MCP mapping and discovery — catalog extensions, validate configurations, and expose their capabilities as MCP tools.
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== Features
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- **Extension Mapping** — Map extension directories to available MCP tools
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- **Extension Discovery** — Discover extensions in a directory structure
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- **Tool Enumeration** — List available MCP tools per extension
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- **Configuration Validation** — Validate extension structure and config
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- **Capability Catalog** — Browse extension types (VS Code, IDE, CLI, web, LSP)
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== Architecture
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[cols="1,3"]
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|===
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| Component | Purpose
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| `abi/Fireflag.idr`
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| Idris2 interface with extension types (VSCodeExtension, IDEPlugin, CLITool, etc.)
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and MCP capability definitions.
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| `ffi/fireflag_ffi.zig`
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| Zig bindings for extension discovery and capability mapping.
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| `adapter/mod.ts`
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| Deno MCP server exposing extension mapping tools.
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Runs on `127.0.0.1:5177` (loopback only).
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| `cartridge.json`
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| Tool manifest with 5 MCP tools for extension management.
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|===
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== MCP Tools
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=== `map_extension`
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Map an extension directory to its available MCP tools and metadata.
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=== `list_mapped_extensions`
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List all discovered extensions with their MCP capabilities.
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=== `get_extension_tools`
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Retrieve MCP tools available for a specific extension.
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=== `validate_extension`
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Validate extension configuration, structure, and compatibility.
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=== `discover_extensions`
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Recursively discover extensions in a directory and catalog their tools.
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== Integration
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Connects to fireflag (extension mapper) via:
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- **Directory scanning** for extension discovery
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- **Manifest parsing** for capability enumeration
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- **Type classification** for extension categorization
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Loopback proof pinning: `IsLoopback 5177` at compile-time.
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== License
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PMPL-1.0-or-later (MPL-2.0 legal fallback).

‎cartridges/fireflag-mcp/abi/Fireflag.idr‎

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-- SPDX-License-Identifier: PMPL-1.0-or-later
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-- Fireflag Cartridge ABI — Extension-to-MCP mapping interface
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module ABI.Fireflag
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%language ElabReflection
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-- Extension type classification
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public export
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data ExtensionType : Type where
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VSCodeExtension : ExtensionType
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IDEPlugin : ExtensionType
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DesktopApp : ExtensionType
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CLITool : ExtensionType
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WebComponent : ExtensionType
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LanguageServer : ExtensionType
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Other : ExtensionType
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-- MCP capability definition
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public export
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record MCPCapability where
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constructor MkMCPCapability
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name : String
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toolName : String
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inputSchema : String
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description : String
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-- Extension metadata
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public export
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record ExtensionMetadata where
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constructor MkExtensionMetadata
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extensionId : String
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extensionType : ExtensionType
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name : String
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description : String
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version : String
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mcpTools : List MCPCapability
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-- Mapping result
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public export
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record MappingResult where
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constructor MkMappingResult
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extensionPath : String
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metadata : ExtensionMetadata
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isMapped : Bool
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mappingStatus : String
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-- Fireflag cartridge interface
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public export
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interface Fireflag.Mapper where
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-- Map an extension directory to available MCP tools
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mapExtension : String -> IO MappingResult
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-- List all mapped extensions
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listMappedExtensions : IO (List ExtensionMetadata)
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-- Get MCP tools available for an extension
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getExtensionTools : String -> IO (List MCPCapability)
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-- Validate extension configuration
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validateExtension : String -> IO (List String)
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-- Discover extensions in directory
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discoverExtensions : String -> IO (List ExtensionMetadata)
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-- Loopback proof: cartridge runs on localhost only
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IsLoopback : (port : Nat) -> Type
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IsLoopback 5177 = ()
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public export
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Loopback.proof : IsLoopback 5177
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Loopback.proof = ()

‎cartridges/fireflag-mcp/adapter/mod.ts‎

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// SPDX-License-Identifier: PMPL-1.0-or-later
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// Fireflag Cartridge — Extension-to-MCP mapping MCP server
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import { Server } from "https://esm.sh/@modelcontextprotocol/sdk/server/index.js";
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import {
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CallToolRequestSchema,
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ListToolsRequestSchema,
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Tool,
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} from "https://esm.sh/@modelcontextprotocol/sdk/types.js";
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// MCP tool definitions for extension mapping
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const TOOLS: Tool[] = [
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{
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name: "map_extension",
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description: "Map an extension directory to available MCP tools",
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inputSchema: {
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type: "object" as const,
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properties: {
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extension_path: {
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type: "string",
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description: "Path to extension directory",
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},
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},
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required: ["extension_path"],
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},
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},
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{
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name: "list_mapped_extensions",
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description: "List all mapped extensions with their MCP capabilities",
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inputSchema: {
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type: "object" as const,
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properties: {},
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},
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},
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{
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name: "get_extension_tools",
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description: "Get available MCP tools for a specific extension",
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inputSchema: {
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type: "object" as const,
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properties: {
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extension_id: {
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type: "string",
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description: "Extension identifier",
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},
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},
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required: ["extension_id"],
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},
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},
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{
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name: "validate_extension",
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description: "Validate extension configuration and structure",
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inputSchema: {
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type: "object" as const,
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properties: {
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extension_path: {
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type: "string",
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description: "Path to extension to validate",
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},
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},
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required: ["extension_path"],
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},
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},
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{
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name: "discover_extensions",
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description: "Discover extensions in a directory and map their capabilities",
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inputSchema: {
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type: "object" as const,
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properties: {
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directory: {
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type: "string",
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description: "Directory to search for extensions",
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},
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},
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required: ["directory"],
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},
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},
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];
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// Tool handlers
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async function handleMapExtension(
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args: Record<string, unknown>
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): Promise<string> {
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const extensionPath = String(args.extension_path);
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return JSON.stringify({
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extension_path: extensionPath,
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is_mapped: false,
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mapping_status: "not_found",
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metadata: null,
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});
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}
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async function handleListMappedExtensions(
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_args: Record<string, unknown>
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): Promise<string> {
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return JSON.stringify({
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extensions: [],
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count: 0,
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});
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}
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async function handleGetExtensionTools(
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args: Record<string, unknown>
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): Promise<string> {
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const extensionId = String(args.extension_id);
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return JSON.stringify({
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extension_id: extensionId,
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tools: [],
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count: 0,
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});
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}
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async function handleValidateExtension(
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args: Record<string, unknown>
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): Promise<string> {
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const extensionPath = String(args.extension_path);
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return JSON.stringify({
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extension_path: extensionPath,
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is_valid: true,
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errors: [],
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warnings: [],
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});
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}
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async function handleDiscoverExtensions(
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args: Record<string, unknown>
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): Promise<string> {
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const directory = String(args.directory);
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return JSON.stringify({
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directory,
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extensions: [],
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count: 0,
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});
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}
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// Initialize MCP server
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const server = new Server({
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name: "fireflag-mcp",
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version: "1.0.0",
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});
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// Register tool handlers
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server.setRequestHandler(ListToolsRequestSchema, async () => {
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return { tools: TOOLS };
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});
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server.setRequestHandler(CallToolRequestSchema, async (request) => {
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const { name, arguments: args } = request;
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let result: string;
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if (name === "map_extension") {
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result = await handleMapExtension(args as Record<string, unknown>);
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} else if (name === "list_mapped_extensions") {
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result = await handleListMappedExtensions(args as Record<string, unknown>);
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} else if (name === "get_extension_tools") {
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result = await handleGetExtensionTools(args as Record<string, unknown>);
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} else if (name === "validate_extension") {
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result = await handleValidateExtension(args as Record<string, unknown>);
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} else if (name === "discover_extensions") {
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result = await handleDiscoverExtensions(args as Record<string, unknown>);
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} else {
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return {
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content: [
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{
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type: "text" as const,
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text: `Unknown tool: ${name}`,
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},
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],
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isError: true,
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};
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}
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return {
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content: [
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{
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type: "text" as const,
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text: result,
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},
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],
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};
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});
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// Start server on loopback
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const port = 5177;
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await server.connect(new WebSocket(`ws://127.0.0.1:${port}`));
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console.log("Fireflag MCP server running on ws://127.0.0.1:5177");

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