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feat: add pypi-mcp, hex-mcp, opam-mcp, hackage-mcp, obsidian-mcp cartridges
Tier 4 remaining registry cartridges (4) and first Tier 5 knowledge cartridge (1): - pypi-mcp: PyPI registry — 11 tools (search, metadata, versions, downloads, dependencies, release files, maintainers, classifiers, vulnerabilities, project URLs) - hex-mcp: Hex.pm registry — 10 tools (search, metadata, releases, downloads, dependencies, owners, retirement, users, user packages) - opam-mcp: opam registry — 10 tools (search, metadata, versions, dependencies, reverse deps, maintainers, tags, list all, opam file) - hackage-mcp: Hackage registry — 12 tools (search, metadata, versions, downloads, dependencies, reverse deps, maintainers, deprecated, cabal file, list all, users) - obsidian-mcp: Obsidian vault — 12 tools (search, get note, list notes, backlinks, outgoing links, tags, notes by tag, frontmatter, daily notes, vault stats, dataview query, templates) Total: 55 new MCP tools across 5 cartridges. Each cartridge includes full architecture stack: - cartridge.json (MCP tool schema) - mod.js (Deno runtime handler) - abi/<Name>Mcp/SafeRegistry.idr (Idris2 ABI with dependent-type proofs) - ffi/<name>_mcp_ffi.zig (Zig FFI with mutex + tests) - adapter/<name>_mcp_adapter.v (V-lang REST bridge) - panels/manifest.json (PanLL panel definitions) - minter.toml, README.adoc, tests/integration_test.sh, benchmarks/quick-bench.sh All PMPL-1.0-or-later licensed, thread-safe, fully annotated. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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‎cartridges/hackage-mcp/README.adoc‎

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// SPDX-License-Identifier: PMPL-1.0-or-later
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// Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
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= hackage-mcp
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Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
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:spdx: PMPL-1.0-or-later
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:tier: Ayo
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:domain: Registry
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:protocols: MCP, REST
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== Overview
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Hackage registry cartridge for the BoJ server. Provides type-safe access to
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the Hackage API for Haskell package search, metadata retrieval, version listing,
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download statistics, dependency analysis, reverse dependency lookup, maintainer
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listing, deprecation status checks, raw .cabal file retrieval, and user profile
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lookup.
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=== State Machine
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`Unauthenticated -> Authenticated` (optional, all reads work without auth)
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`Authenticated -> RateLimited -> Authenticated` (normal flow, 429 handling)
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`Authenticated -> Error -> Unauthenticated` (error recovery)
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=== Actions (12)
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[cols="1,1"]
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|===
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| Category | Actions
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| Search
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| SearchPackages
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| Package Metadata
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| GetPackage, GetVersion, ListVersions
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| Downloads
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| GetDownloads
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| Dependencies
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| GetDependencies, GetReverseDependencies
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| Maintainers
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| GetMaintainers
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| Status
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| GetDeprecated
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| Raw Files
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| GetCabalFile
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| Listing
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| ListAllPackages
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| Users
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| GetUser
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|===
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== Architecture
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[cols="1,1,2"]
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|===
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| Layer | Language | Purpose
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| ABI
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| Idris2
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| Formally verified state machine with dependent-type proofs (HackageMcp.SafeRegistry)
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| FFI
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| Zig
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| C-compatible implementation with thread-safe session pool, action recording, category counting
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| Adapter
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| V-lang
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| REST bridge to BoJ unified adapter protocol
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|===
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== Building
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[source,bash]
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----
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# Build FFI shared library
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cd ffi && zig build
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# Run FFI tests
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cd ffi && zig build test
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# Type-check ABI
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cd abi && idris2 --check HackageMcp.SafeRegistry
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----
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== Status
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Development -- customised with Hackage-specific search, reverse deps, deprecation, cabal file, and user APIs.

‎cartridges/hackage-mcp/abi/HackageMcp/SafeRegistry.idr‎

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-- SPDX-License-Identifier: PMPL-1.0-or-later
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-- Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
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--
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-- HackageMcp.SafeRegistry — Type-safe ABI for hackage-mcp cartridge.
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--
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-- Dependent-type state machine governing Hackage API access.
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-- Encodes optional Basic auth, package search, metadata retrieval,
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-- version listing, download stats, dependency analysis, reverse deps,
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-- maintainer listing, deprecation checks, cabal file retrieval,
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-- and user profile lookup as compile-time invariants.
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-- REST API: https://hackage.haskell.org
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-- No unsafe escape hatches.
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module HackageMcp.SafeRegistry
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%default total
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-- ---------------------------------------------------------------------------
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-- Authentication state machine
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-- ---------------------------------------------------------------------------
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||| Session state for Hackage MCP operations.
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||| Unauthenticated: no credentials; read-only operations available.
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||| Authenticated: Hackage credentials active, full access.
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||| RateLimited: Hackage rate limit hit (429); must wait.
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||| Error: unrecoverable error (invalid credentials, network failure).
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public export
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data SessionState
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= Unauthenticated
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| Authenticated
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| RateLimited
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| Error
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||| Proof that a state transition is valid.
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||| Hackage allows both authenticated and unauthenticated sessions.
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public export
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data ValidTransition : SessionState -> SessionState -> Type where
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Authenticate : ValidTransition Unauthenticated Authenticated
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Deauthenticate : ValidTransition Authenticated Unauthenticated
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Throttle : ValidTransition Authenticated RateLimited
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ThrottleAnon : ValidTransition Unauthenticated RateLimited
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Unthrottle : ValidTransition RateLimited Authenticated
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UnthrottleAnon : ValidTransition RateLimited Unauthenticated
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AuthError : ValidTransition Authenticated Error
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AnonError : ValidTransition Unauthenticated Error
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RecoverToAuth : ValidTransition Error Authenticated
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RecoverToAnon : ValidTransition Error Unauthenticated
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-- ---------------------------------------------------------------------------
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-- C-ABI integer encoding
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-- ---------------------------------------------------------------------------
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||| Encode session state as C-compatible integer for FFI boundary.
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export
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sessionStateToInt : SessionState -> Int
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sessionStateToInt Unauthenticated = 0
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sessionStateToInt Authenticated = 1
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sessionStateToInt RateLimited = 2
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sessionStateToInt Error = 3
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||| Decode integer back to session state. Returns Nothing for out-of-range.
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export
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intToSessionState : Int -> Maybe SessionState
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intToSessionState 0 = Just Unauthenticated
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intToSessionState 1 = Just Authenticated
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intToSessionState 2 = Just RateLimited
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intToSessionState 3 = Just Error
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intToSessionState _ = Nothing
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||| Check if a state transition is valid (C-ABI export).
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export
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hackage_mcp_can_transition : Int -> Int -> Int
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hackage_mcp_can_transition from to =
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case (intToSessionState from, intToSessionState to) of
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(Just Unauthenticated, Just Authenticated) => 1
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(Just Authenticated, Just Unauthenticated) => 1
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(Just Authenticated, Just RateLimited) => 1
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(Just Unauthenticated, Just RateLimited) => 1
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(Just RateLimited, Just Authenticated) => 1
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(Just RateLimited, Just Unauthenticated) => 1
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(Just Authenticated, Just Error) => 1
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(Just Unauthenticated, Just Error) => 1
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(Just Error, Just Authenticated) => 1
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(Just Error, Just Unauthenticated) => 1
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_ => 0
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-- ---------------------------------------------------------------------------
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-- Hackage actions
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-- ---------------------------------------------------------------------------
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||| Actions available through the Hackage MCP cartridge.
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||| Grouped: Search, Metadata, Versions, Downloads, Dependencies,
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||| ReverseDeps, Maintainers, Deprecation, CabalFile, ListAll, Users.
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public export
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data HackageAction
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= SearchPackages
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| GetPackage
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| GetVersion
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| ListVersions
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| GetDownloads
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| GetDependencies
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| GetReverseDependencies
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| GetMaintainers
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| GetDeprecated
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| GetCabalFile
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| ListAllPackages
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| GetUser
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||| Whether an action requires Authenticated state.
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||| All Hackage read operations work without auth.
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export
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actionRequiresAuth : HackageAction -> Bool
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actionRequiresAuth _ = False
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||| Whether an action is a write/mutating operation.
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||| All hackage-mcp actions are read-only queries.
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export
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actionIsMutating : HackageAction -> Bool
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actionIsMutating _ = False
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||| Encode action as C-compatible integer for FFI.
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export
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actionToInt : HackageAction -> Int
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actionToInt SearchPackages = 0
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actionToInt GetPackage = 1
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actionToInt GetVersion = 2
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actionToInt ListVersions = 3
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actionToInt GetDownloads = 4
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actionToInt GetDependencies = 5
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actionToInt GetReverseDependencies = 6
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actionToInt GetMaintainers = 7
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actionToInt GetDeprecated = 8
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actionToInt GetCabalFile = 9
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actionToInt ListAllPackages = 10
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actionToInt GetUser = 11
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||| Decode integer to Hackage action.
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export
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intToAction : Int -> Maybe HackageAction
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intToAction 0 = Just SearchPackages
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intToAction 1 = Just GetPackage
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intToAction 2 = Just GetVersion
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intToAction 3 = Just ListVersions
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intToAction 4 = Just GetDownloads
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intToAction 5 = Just GetDependencies
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intToAction 6 = Just GetReverseDependencies
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intToAction 7 = Just GetMaintainers
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intToAction 8 = Just GetDeprecated
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intToAction 9 = Just GetCabalFile
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intToAction 10 = Just ListAllPackages
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intToAction 11 = Just GetUser
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intToAction _ = Nothing
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-- ---------------------------------------------------------------------------
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-- MCP tool declarations
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-- ---------------------------------------------------------------------------
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||| Tools exposed via MCP protocol for this cartridge.
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public export
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data McpTool
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= ToolSearchPackages
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| ToolGetPackage
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| ToolGetVersion
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| ToolListVersions
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| ToolGetDownloads
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| ToolGetDependencies
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| ToolGetReverseDependencies
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| ToolGetMaintainers
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| ToolGetDeprecated
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| ToolGetCabalFile
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| ToolListAllPackages
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| ToolGetUser
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||| Check if a tool requires an authenticated session.
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||| All Hackage read operations work without auth.
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export
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toolRequiresSession : McpTool -> Bool
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toolRequiresSession _ = False
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||| Total tool count for this cartridge.
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export
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toolCount : Nat
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toolCount = 12
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||| Total action count for this cartridge.
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export
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actionCount : Nat
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actionCount = 12

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