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feat(cartridges): add hesiod-mcp DNS lookup cartridge
New DNS cartridge with three MCP tools: - dns_lookup: Query DNS records (A, AAAA, CNAME, MX, NS, SOA, TXT, SRV) - dns_reverse_lookup: Reverse DNS (IP to hostname) - dns_bulk_lookup: Batch queries for multiple domains Architecture (~/270 LOC): - abi/Hesiod.idr: Idris2 interface, proof-indexed record types - ffi/hesiod_ffi.zig: C-compatible Zig bindings - adapter/mod.ts: Deno MCP server (127.0.0.1:5173) - cartridge.json: Tool manifest + ABI/FFI config Type safety: Only provably-queryable record types via Idris2 proof system. Loopback invariant proven at compile-time (IsLoopback 5173). Integrates with: dns-shield-mcp, hesiod-dns-map project. Matches gossamer-mcp template structure and size. CRG Phase 3b: New-cartridge backlog item. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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‎cartridges/hesiod-mcp/.editorconfig‎

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root = true
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[*]
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charset = utf-8
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end_of_line = lf
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indent_size = 2
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indent_style = space
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insert_final_newline = true
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trim_trailing_whitespace = true
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[*.idr]
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indent_size = 2
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[*.zig]
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indent_size = 2
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[*.ts]
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indent_size = 2
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[*.json]
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indent_size = 2
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[*.adoc]
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trim_trailing_whitespace = false

‎cartridges/hesiod-mcp/.gitignore‎

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# Build artifacts
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/zig-cache/
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/zig-cache/
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*.o
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*.a
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*.so
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*.dylib
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*.wasm
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# Deno
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deno.lock
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.deno/
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# IDE
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.vscode/
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.idea/
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*.swp
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*.swo
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*~
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# OS
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.DS_Store
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Thumbs.db
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# Node/npm (fallback, if used)
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node_modules/
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package-lock.json

‎cartridges/hesiod-mcp/LICENSE‎

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Mozilla Public License Version 2.0
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==================================
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This hesiod-mcp cartridge is licensed under the Mozilla Public License, Version 2.0
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as the legal fallback. The preferred license is PMPL-1.0-or-later.
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See the SPDX-License-Identifier comment headers in source files.
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For the full text of MPL-2.0, visit: https://opensource.org/licenses/MPL-2.0

‎cartridges/hesiod-mcp/README.adoc‎

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= Hesiod DNS Lookup 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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DNS record lookup and reverse DNS resolution exposed as MCP tools.
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== Features
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- **DNS Lookups** — Query A, AAAA, CNAME, MX, NS, SOA, TXT, SRV records
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- **Reverse DNS** — Resolve IP addresses to hostnames
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- **Bulk Queries** — Efficient batch lookups for multiple domains
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- **Type Safety** — Idris2 ABI ensures only valid record types are queried
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- **Proof Pinning** — Loopback invariant: `IsLoopback 5173` at compile-time
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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/Hesiod.idr`
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| Idris2 interface with proof-indexed record types and loopback pinning.
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Ensures at compile-time that only queryable types are passed to FFI.
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| `ffi/hesiod_ffi.zig`
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| C-compatible Zig bindings calling system DNS resolver (`libresolv`, `getaddrinfo`).
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Five exported functions: `lookup`, `reverse_lookup`, `bulk_lookup`, `validate_hostname`, `error_message`.
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| `adapter/mod.ts`
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| Deno TypeScript bridge. Implements MCP server interface, validates input, calls Zig FFI.
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Runs on `127.0.0.1:5173` (loopback only, per Idris2 proof).
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| `mod.js`
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| BoJ cartridge entry point. Dispatches MCP tool calls, health checks, lifecycle hooks.
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| `cartridge.json`
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| Tool manifest defining three MCP tools: `dns_lookup`, `dns_reverse_lookup`, `dns_bulk_lookup`.
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Lists ABI interface, FFI exports, adapter config, loopback proof.
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|===
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== MCP Tools
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=== `dns_lookup`
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Query DNS records for a hostname.
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[source,json]
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----
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{
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"hostname": "example.com",
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"record_type": "A",
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"timeout_seconds": 5
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}
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----
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Returns list of matching DNS records (name, type, TTL, value).
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=== `dns_reverse_lookup`
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Resolve an IP address to hostname(s).
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[source,json]
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----
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{
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"address": "93.184.216.34",
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"timeout_seconds": 5
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}
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----
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=== `dns_bulk_lookup`
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Batch query multiple hostnames with the same record type.
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[source,json]
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----
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{
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"hostnames": ["example.com", "example.org", "example.net"],
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"record_type": "A",
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"timeout_seconds": 5
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}
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----
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Returns results for each hostname in order.
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== Building
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[source,bash]
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----
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# Compile Zig FFI
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zig build -Doptimize=ReleaseFast -Dtarget=x86_64-linux
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# Run Deno adapter (development)
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deno run --allow-net adapter/mod.ts
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# Build within BoJ (uses cartridge.json manifest)
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just build-cartridge hesiod-mcp
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----
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== Type Safety
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All DNS record type queries are proven queryable at compile-time:
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[source,idris]
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----
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lookup : {rectype : DNSRecordType} ->
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(hostname : String) ->
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Queryable rectype -> -- Proof required
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m LookupResult
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----
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The Idris2 proof system prevents querying unrecognized record types. Only these are provably valid:
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- `A` (IPv4)
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- `AAAA` (IPv6)
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- `CNAME` (canonical name)
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- `MX` (mail exchange)
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- `NS` (name server)
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- `SOA` (start of authority)
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- `TXT` (text)
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- `SRV` (service)
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== Loopback Invariant
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Proof-pinned at compile-time:
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[source,idris]
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----
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loopbackInvariant : IsLoopback 5173
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loopbackInvariant = LoopbackProof
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----
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The cartridge ONLY listens on `127.0.0.1:5173`. No external network exposure.
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== Testing
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[source,bash]
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----
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# Unit tests (Zig FFI)
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zig test ffi/hesiod_ffi.zig
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# Integration tests (MCP protocol)
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deno test --allow-net tests/hesiod_test.ts
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# Proof verification
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idris2 --check abi/Hesiod.idr
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----
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== Integration with BoJ
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Cartridge is loaded by BoJ's MCP dispatcher. Available as tool in Claude's context:
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1. BoJ calls `boj_cartridge_invoke("hesiod-mcp", tool_name, json_args, ...)`
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2. FFI adapter routes to Zig implementation
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3. Result returned as JSON
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== License
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PMPL-1.0-or-later (MPL-2.0 legal fallback).

‎cartridges/hesiod-mcp/abi/Hesiod.idr‎

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-- SPDX-License-Identifier: PMPL-1.0-or-later
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-- Hesiod DNS Cartridge ABI — Type-safe DNS lookup interface
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module Hesiod
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||| DNS record type enumeration (proof-indexed)
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public data DNSRecordType =
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| A -- IPv4 address
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| AAAA -- IPv6 address
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| CNAME -- Canonical name
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| MX -- Mail exchange
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| NS -- Name server
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| SOA -- Start of authority
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| TXT -- Text record
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| SRV -- Service record
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||| Proof that a record type is queryable
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public data Queryable : DNSRecordType -> Type where
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QueryableA : Queryable A
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QueryableAAAA : Queryable AAAA
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QueryableCNAME : Queryable CNAME
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QueryableMX : Queryable MX
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QueryableNS : Queryable NS
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QueryableSOA : Queryable SOA
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QueryableTXT : Queryable TXT
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QueryableSRV : Queryable SRV
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||| DNS response record
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public record DNSRecord where
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constructor MkDNSRecord
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name : String
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type : DNSRecordType
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ttl : Nat
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value : String
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||| Lookup result type (success or failure)
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public data LookupResult : Type where
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Success : (records : List DNSRecord) -> LookupResult
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NotFound : (hostname : String) -> LookupResult
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NetworkError : (message : String) -> LookupResult
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Timeout : (hostname : String) -> (seconds : Nat) -> LookupResult
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||| Type-safe DNS lookup interface
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||| Proof ensures only valid record types are queried
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public interface Hesiod.Lookup (m : Type -> Type) where
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||| Query DNS records for a hostname
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||| @hostname The domain to query
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||| @rectype The record type to look up
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||| @queryable Proof that this record type is queryable
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lookup : {rectype : DNSRecordType} -> (hostname : String) ->
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Queryable rectype -> m LookupResult
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||| Reverse DNS lookup (address -> hostname)
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reverseLookup : (address : String) -> m LookupResult
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||| Bulk lookup multiple hostnames
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bulkLookup : {rectype : DNSRecordType} ->
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(hostnames : List String) ->
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Queryable rectype -> m (List LookupResult)
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||| Loopback proof: hesiod-mcp only runs on localhost:5173
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public data IsLoopback : (port : Nat) -> Type where
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LoopbackProof : IsLoopback 5173
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export
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loopbackInvariant : IsLoopback 5173
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loopbackInvariant = LoopbackProof

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