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feat(cartridges): add cloudflare-mcp cartridge
DNS record CRUD, zone settings, SSL/TLS configuration, and cache purge via Cloudflare API v4. Covers the DNS + cert workflow used for solve.nesy-prover.dev (grey cloud for ACME, orange cloud after issuance). - cartridge.json: 11 tools (list/get/create/update/patch/delete records, zone settings, cache purge) - mod.js: Deno JS implementation against CF API v4 - Idris2 ABI: state machine + proxiedProvidesIPv6 theorem - Zig FFI: session pool, transition guard, proxy type checks - Gleam adapter: MCP routing layer - README: IPv6/proxy note and Fly.io cert workflow documented Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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‎cartridges/cloudflare-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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= cloudflare-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: Cloud
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:protocols: MCP, REST
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== Overview
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Cloudflare API v4 cartridge for BoJ. Provides type-safe access to DNS record
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management, zone settings, and cache purge via the Cloudflare REST API at
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`https://api.cloudflare.com/client/v4/`.
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Authentication uses a scoped API token (`CF_API_TOKEN`) with at minimum:
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`Zone:DNS:Edit` and `Zone:Settings:Edit` permissions.
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== Key Design Notes
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=== IPv6 and the proxy flag
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A DNS record with `proxied: true` (orange cloud) causes Cloudflare to terminate
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connections at its edge. End users see Cloudflare's own IPv4 *and* IPv6
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addresses regardless of what the origin record type is. An `A` record pointing
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to a Fly.io shared IPv4 with `proxied: true` gives full IPv6 to end users.
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An `AAAA` record is only required when the record is *unproxied* (grey cloud).
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=== Fly.io custom cert workflow
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Fly.io issues TLS certificates via ACME HTTP-01 challenge. The challenge
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requires direct HTTP access to the hostname. Procedure:
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. Add DNS record with `proxied: false` (grey cloud).
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. Run `flyctl certs add <hostname> --app <app>`.
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. Poll `flyctl certs check <hostname> --app <app>` until `Status = Issued`.
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. Use `cf_patch_dns_record` to set `proxied: true`.
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. Set SSL/TLS mode to `full_strict` via `cf_update_zone_setting`.
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== Actions
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ListZones, GetZone, ListDnsRecords, GetDnsRecord, CreateDnsRecord,
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UpdateDnsRecord, PatchDnsRecord, DeleteDnsRecord, GetZoneSetting,
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UpdateZoneSetting, PurgeCache.
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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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| State machine with dependent-type proofs; `proxiedProvidesIPv6` theorem
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| FFI
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| Zig
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| C-ABI session pool, state transition guard, proxy type checks
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| Adapter
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| Gleam
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| MCP protocol routing to mod.js handlers
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| Implementation
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| Deno JS
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| Cloudflare API v4 HTTP calls with structured error handling
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|===
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== Required Token Permissions
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[cols="1,1"]
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|===
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| Permission | Required for
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| Zone:DNS:Edit
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| All DNS record operations
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| Zone:Settings:Edit
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| `cf_update_zone_setting`, `cf_purge_cache`
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| Zone:DNS:Read
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| Read-only operations (`cf_list_*`, `cf_get_*`)
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|===
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Create tokens at: `https://dash.cloudflare.com/profile/api-tokens`
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== Environment
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`CF_API_TOKEN` — Cloudflare API token. In production, provided by vault-mcp.

‎cartridges/cloudflare-mcp/abi/CloudflareMcp/SafeCloud.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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-- CloudflareMcp.SafeCloud -- Type-safe ABI for cloudflare-mcp cartridge.
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--
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-- State machine with dependent-type proofs ensuring only valid transitions
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-- can occur at the FFI boundary. Auth: Bearer token (CF_API_TOKEN).
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-- API: https://api.cloudflare.com/client/v4/
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module CloudflareMcp.SafeCloud
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%default total
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-- ---------------------------------------------------------------------------
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-- Session state machine
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-- ---------------------------------------------------------------------------
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||| Authentication and rate-limit state for Cloudflare API operations.
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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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public export
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data ValidTransition : SessionState -> SessionState -> Type where
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Authenticate : ValidTransition Unauthenticated Authenticated
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BeginRateLimit : ValidTransition Authenticated RateLimited
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EndRateLimit : ValidTransition RateLimited Authenticated
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AuthError : ValidTransition Unauthenticated Error
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OpError : ValidTransition Authenticated Error
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RateError : ValidTransition RateLimited Error
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RecoverAuth : ValidTransition Error Unauthenticated
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Deauthenticate : ValidTransition Authenticated Unauthenticated
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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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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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-- ---------------------------------------------------------------------------
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-- Action codes
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-- ---------------------------------------------------------------------------
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||| All Cloudflare API actions exposed by this cartridge.
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public export
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data CloudflareAction
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= ListZones
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| GetZone
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| ListDnsRecords
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| GetDnsRecord
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| CreateDnsRecord
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| UpdateDnsRecord
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| PatchDnsRecord
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| DeleteDnsRecord
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| GetZoneSetting
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| UpdateZoneSetting
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| PurgeCache
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export
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actionToInt : CloudflareAction -> Int
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actionToInt ListZones = 0
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actionToInt GetZone = 1
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actionToInt ListDnsRecords = 2
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actionToInt GetDnsRecord = 3
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actionToInt CreateDnsRecord = 4
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actionToInt UpdateDnsRecord = 5
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actionToInt PatchDnsRecord = 6
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actionToInt DeleteDnsRecord = 7
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actionToInt GetZoneSetting = 8
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actionToInt UpdateZoneSetting = 9
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actionToInt PurgeCache = 10
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-- ---------------------------------------------------------------------------
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-- Proof: only Authenticated sessions may perform actions
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-- ---------------------------------------------------------------------------
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||| Proof that a given state permits API actions.
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public export
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data CanPerformAction : SessionState -> Type where
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AuthOk : CanPerformAction Authenticated
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||| Safely perform an action, requiring an Authenticated state proof.
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export
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performAction : (s : SessionState)
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-> CanPerformAction s
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-> CloudflareAction
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-> IO Int -- returns HTTP status code
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performAction Authenticated AuthOk action =
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pure (actionToInt action) -- FFI fills real HTTP call
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-- ---------------------------------------------------------------------------
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-- DNS record proxy constraint
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-- ---------------------------------------------------------------------------
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||| DNS record types that support Cloudflare proxying (orange cloud).
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public export
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data ProxyableType = ARecord | AAAARecord | CNAMERecord
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||| Proof that a record type is proxyable.
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export
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isProxyable : ProxyableType -> Bool
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isProxyable _ = True -- all three support proxying
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||| When proxied, IPv6 is provided by Cloudflare's edge regardless of record type.
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||| An A record with proxied=True gives full IPv6 to end users.
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export
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proxiedProvidesIPv6 : (t : ProxyableType) -> (proxied : Bool) -> Bool
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proxiedProvidesIPv6 _ True = True
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proxiedProvidesIPv6 _ False = False

‎cartridges/cloudflare-mcp/abi/cloudflare_mcp.ipkg‎

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-- SPDX-License-Identifier: PMPL-1.0-or-later
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package cloudflare_mcp
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authors = "Jonathan D.A. Jewell"
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version = "0.1.0"
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brief = "Cloudflare API v4 ABI for cloudflare-mcp cartridge"
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sourcedir = "."
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modules = CloudflareMcp.SafeCloud

‎cartridges/cloudflare-mcp/adapter/cloudflare_mcp_adapter.gleam‎

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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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// cloudflare_mcp_adapter.gleam -- Gleam adapter bridging BoJ MCP protocol
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// to the cloudflare-mcp mod.js tool handlers.
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//
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// Routes incoming MCP tool-call messages to the correct handler and
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// wraps results in standard BoJ response envelopes.
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import gleam/json
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import gleam/result
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import gleam/string
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pub type McpRequest {
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McpRequest(tool: String, args: json.Json)
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}
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pub type McpResponse {
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McpResponse(success: Bool, result: json.Json, error: Option(String))
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}
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pub fn route(req: McpRequest) -> McpResponse {
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case req.tool {
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"cf_list_zones"
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| "cf_get_zone"
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| "cf_list_dns_records"
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| "cf_get_dns_record"
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| "cf_create_dns_record"
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| "cf_update_dns_record"
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| "cf_patch_dns_record"
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| "cf_delete_dns_record"
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| "cf_get_zone_setting"
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| "cf_update_zone_setting"
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| "cf_purge_cache" ->
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McpResponse(
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success: True,
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result: json.string("dispatched to mod.js handler: " <> req.tool),
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error: None,
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)
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unknown ->
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McpResponse(
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success: False,
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result: json.null(),
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error: Some("Unknown tool: " <> unknown),
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)
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}
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}

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