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feat(local-coord-mcp): proper Nickel contracts with dependent constraints
Task #16. Upgrades from "JSON Schema syntax embedded in Nickel" to actual Nickel contracts for the four dependent rules JSON Schema can't cleanly express. New file schemas/coord-messages-contracts.ncl exports: - Primitive contracts: RiskTier, OpKind, MsgIdHex, HashHex (predicate- based, validate shape + constraints). - TierContextGate — Tier >= 2 envelopes MUST carry non-empty context_fetch_id. Enforces the adaptive-awareness invariant (DD-10). - TierAttestationGate — Tier >= 2 from role=supervised MUST carry at least one attestation_refs entry. Enforces M-of-N Byzantine safety (DD-8). - UrgentDirectRestriction — urgent_direct=true is forbidden for supervised peers (DD-12 user-interaction routing). - TierOverrideJustification — if declared risk_tier differs from op_kind.tier_default, tier_override_reason is required. Catches tier underclaiming (DD-14). - validate = a lazy function composing all four. Consumers call `envelope | contracts.validate` to run all checks. The sibling schemas/coord-messages.ncl stays as the portable JSON-Schema-exportable interface; the two files work together: JSON Schema (.json export) → shape validation for all clients Nickel contracts (this) → rich cross-field rules, server-side Test harness schemas/test-contracts.sh covers 6 cases: - tier 0 status envelope → accepted - tier 2 claim with context_fetch_id → accepted - tier 2 without context_fetch_id → rejected - tier 3 from supervised without attestation → rejected - urgent_direct from supervised → rejected - tier 3 declared on op_kind=status with no override_reason → rejected All 6 pass. Consumers (Task #17 Deno shim in mcp-bridge) will import this file on bridge startup and invoke `validate` on each coord_send / coord_send_gated envelope BEFORE forwarding to the Zig adapter. Early rejection, defense-in-depth. Roadmap: Task #17 = Deno shim wiring; Phase 2 = Idris2 session types for the choreography these rules imply. Design log: Desktop/COORD-MCP-DESIGN-LOG.md (Appendix K roadmap). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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‎cartridges/local-coord-mcp/schemas/coord-messages-contracts.ncl‎

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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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# coord-messages-contracts.ncl — Nickel contracts for rich server-side
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# envelope validation. Sibling to coord-messages.ncl (portable JSON
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# Schema) — use this file for cross-field dependent constraints that
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# JSON Schema can't elegantly express.
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#
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# Wired into mcp-bridge via a Deno shim (Task #17): on each coord_send
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# or coord_send_gated call, the bridge imports this file, extracts
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# `EnvelopeV1`, and applies it to the message body. Invalid envelopes
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# are rejected with a descriptive error before they reach the Zig
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# adapter.
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#
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# Usage pattern:
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# let contracts = import "coord-messages-contracts.ncl" in
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# let ok_envelope = my_envelope | contracts.EnvelopeV1 in
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# ...
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#
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# If any constraint fails, Nickel emits a descriptive error pointing at
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# the offending field. The Deno shim translates that error into an MCP
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# error response.
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let OpDefaults = {
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status = 0,
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query = 0,
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context_query = 0,
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context_reply = 0,
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supervise_req = 0,
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supervise_resp = 0,
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attest_req = 0,
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attest_resp = 0,
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fyi = 1,
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progress = 1,
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warn_drift = 1,
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release = 1,
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claim = 2,
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handoff = 2,
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clarify = 2,
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blocker = 3,
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gated_op = 3,
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} in
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let OpKinds = std.record.fields OpDefaults in
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{
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# ── Primitive contracts ─────────────────────────────────────────
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RiskTier = std.contract.from_predicate (fun v =>
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std.is_number v
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&& v >= 0
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&& v <= 4
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&& v == (std.number.floor v)
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),
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OpKind = std.contract.from_predicate (fun v =>
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std.is_string v && std.array.any (fun k => k == v) OpKinds
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),
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MsgIdHex = std.contract.from_predicate (fun v =>
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std.is_string v
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&& std.string.length v == 12
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&& std.string.is_match "^[0-9a-f]{12}$" v
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),
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HashHex = std.contract.from_predicate (fun v =>
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std.is_string v
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&& std.string.length v == 64
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&& std.string.is_match "^[0-9a-f]{64}$" v
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),
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# ── Dependent constraints — the rules JSON Schema can't express ──
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# Any Tier >= 2 envelope MUST carry a non-empty context_fetch_id.
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# Blast-radius scaled: drone at Tier 0/1, strategic at Tier 2+.
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TierContextGate = std.contract.from_predicate (fun e =>
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!(std.record.has_field "risk_tier" e)
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|| e.risk_tier < 2
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|| (std.record.has_field "context_fetch_id" e
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&& std.is_string e.context_fetch_id
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&& std.string.length e.context_fetch_id > 0)
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),
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# Any Tier >= 2 envelope from a peer whose role is "supervised" MUST
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# carry at least one attestation_refs entry. M-of-N Byzantine safety.
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#
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# The sender's role is NOT in the envelope itself (server-attached at
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# dispatch). Validator caller passes role via e._meta.sender_role when
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# running this contract server-side.
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TierAttestationGate = std.contract.from_predicate (fun e =>
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!(std.record.has_field "risk_tier" e)
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|| e.risk_tier < 2
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|| !(std.record.has_field "_meta" e)
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|| !(std.record.has_field "sender_role" e._meta)
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|| e._meta.sender_role != "supervised"
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|| (std.record.has_field "attestation_refs" e
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&& std.is_array e.attestation_refs
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&& std.array.length e.attestation_refs >= 1)
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),
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# urgent_direct=true is only permitted for supervisor + executor.
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# supervised peers never interrupt the user directly.
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UrgentDirectRestriction = std.contract.from_predicate (fun e =>
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!(std.record.has_field "urgent_direct" e)
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|| !e.urgent_direct
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|| !(std.record.has_field "_meta" e)
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|| !(std.record.has_field "sender_role" e._meta)
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|| e._meta.sender_role != "supervised"
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),
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# If declared risk_tier differs from the op_kind's default, a
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# non-empty tier_override_reason MUST be present. Catches tier
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# underclaiming ("I said it's Tier 1 but it's a git push").
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TierOverrideJustification = std.contract.from_predicate (fun e =>
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!(std.record.has_field "op_kind" e)
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|| !(std.record.has_field "risk_tier" e)
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|| (
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let default_tier =
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if std.record.has_field e.op_kind OpDefaults then
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std.record.get e.op_kind OpDefaults
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else 0 in
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e.risk_tier == default_tier
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|| (std.record.has_field "tier_override_reason" e
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&& std.is_string e.tier_override_reason
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&& std.string.length e.tier_override_reason > 0)
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)
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),
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# ── Combined validator ─────────────────────────────────────────
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#
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# Lazy function that applies all four dependent-constraint contracts
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# in sequence. Shape validation stays in the JSON Schema sibling
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# (coord-messages.ncl / .json) — this validator runs AFTER shape has
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# been confirmed by a JSON Schema validator.
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#
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# Usage from the Deno shim (Task #17):
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#
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# const contracts = await loadNickel("coord-messages-contracts.ncl");
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# // First: JSON Schema validates shape.
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# // Then: this validator applies dependent constraints.
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# const result = applyNickelContract(contracts.validate, envelope);
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#
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# Wrapped in a function so Nickel doesn't eagerly try to realise it
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# when the file is imported — evaluation happens when validate is
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# called on actual envelope data.
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validate = fun envelope =>
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envelope
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| TierContextGate
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| TierAttestationGate
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| UrgentDirectRestriction
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| TierOverrideJustification,
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}

‎cartridges/local-coord-mcp/schemas/coord-messages.ncl‎

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{ pattern = "SET secret", min_tier = 3, reason = "Secret modification" },
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{ pattern = "--no-verify", min_tier = 3, reason = "Hook bypass" },
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],
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# Note on validation layers:
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# - This file (JSON-Schema-style) is the PORTABLE interface. Exports
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# to coord-messages.json for any JSON Schema validator.
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# - Rich dependent-constraint validation lives in sibling file
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# schemas/coord-messages-contracts.ncl — use that for server-side
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# checks via the Deno shim (Task #17). It expresses rules that JSON
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# Schema can't cleanly say (Tier 2+ requires context_fetch_id, etc.)
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}

‎cartridges/local-coord-mcp/schemas/test-contracts.sh‎

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#!/usr/bin/env bash
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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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# test-contracts.sh — Smoke-test the Nickel contracts in
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# coord-messages-contracts.ncl. Each case either passes (envelope
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# accepted by validator) or fails (validator rejects with a specific
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# contract violation).
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#
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# Usage: bash test-contracts.sh
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set -u
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cd "$(dirname "$0")"
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PASS=0
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FAIL=0
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EXPECTED_FAILS=0
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# Run Nickel with an inline envelope piped through the validator.
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# Exit 0 = accepted; non-zero = contract violation.
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run_case() {
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local name="$1"
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local envelope="$2"
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local expect="$3" # "pass" or "fail"
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# Create temp file in schemas/ so relative import works.
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local out
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local tmp="./_test_case_$$.ncl"
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cat > "$tmp" <<NICKEL_EOF
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let c = import "coord-messages-contracts.ncl" in
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let e = $envelope in
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c.validate e
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NICKEL_EOF
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out=$(nickel eval "$tmp" 2>&1)
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local rc=$?
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rm -f "$tmp"
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if [ "$expect" = "pass" ]; then
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if [ $rc -eq 0 ]; then
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echo " PASS: $name"
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PASS=$((PASS + 1))
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else
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echo " FAIL: $name (expected accept, got reject)"
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echo " $out" | head -3
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FAIL=$((FAIL + 1))
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fi
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else
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if [ $rc -ne 0 ]; then
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echo " PASS: $name (expected reject — good)"
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EXPECTED_FAILS=$((EXPECTED_FAILS + 1))
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else
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echo " FAIL: $name (expected reject, got accept)"
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FAIL=$((FAIL + 1))
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fi
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fi
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}
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echo "=== Nickel contract tests ==="
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# ── Valid cases ────────────────────────────────────────────────
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run_case "tier 0 status envelope" \
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'{
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version = 1,
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msg_id = "abcdef012345",
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prev_msg_hash = "0000000000000000000000000000000000000000000000000000000000000000",
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sender = "claude-7f3a",
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recipient = "gemini-b2c1",
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timestamp = "2026-04-20T10:00:00Z",
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op_kind = "status",
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risk_tier = 0,
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payload = { status = "ok" },
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}' \
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"pass"
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run_case "tier 2 claim with context_fetch_id" \
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'{
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version = 1,
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msg_id = "abcdef012346",
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prev_msg_hash = "0000000000000000000000000000000000000000000000000000000000000000",
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sender = "claude-7f3a",
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recipient = "*",
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timestamp = "2026-04-20T10:00:00Z",
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op_kind = "claim",
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risk_tier = 2,
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payload = { task = "audit-X", scope = "repo" },
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context_fetch_id = "ctx-abc123",
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}' \
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"pass"
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# ── Rejections ─────────────────────────────────────────────────
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run_case "tier 2 claim WITHOUT context_fetch_id (TierContextGate)" \
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'{
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version = 1,
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msg_id = "abcdef012347",
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prev_msg_hash = "0000000000000000000000000000000000000000000000000000000000000000",
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sender = "claude-7f3a",
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recipient = "*",
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timestamp = "2026-04-20T10:00:00Z",
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op_kind = "claim",
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risk_tier = 2,
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payload = { task = "audit-X", scope = "repo" },
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}' \
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"fail"
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run_case "tier 3 from supervised WITHOUT attestation (TierAttestationGate)" \
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'{
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version = 1,
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msg_id = "abcdef012348",
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prev_msg_hash = "0000000000000000000000000000000000000000000000000000000000000000",
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sender = "gemini-b2c1",
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recipient = "*",
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timestamp = "2026-04-20T10:00:00Z",
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op_kind = "gated_op",
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risk_tier = 3,
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payload = { action = "push" },
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context_fetch_id = "ctx-abc123",
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_meta = { sender_role = "supervised" },
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}' \
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"fail"
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run_case "urgent_direct from supervised (UrgentDirectRestriction)" \
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'{
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version = 1,
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msg_id = "abcdef012349",
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prev_msg_hash = "0000000000000000000000000000000000000000000000000000000000000000",
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sender = "gemini-b2c1",
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recipient = "claude-7f3a",
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timestamp = "2026-04-20T10:00:00Z",
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op_kind = "clarify",
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risk_tier = 0,
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payload = { question = "hey" },
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urgent_direct = true,
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_meta = { sender_role = "supervised" },
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}' \
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"fail"
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run_case "status declared as tier 3 WITHOUT tier_override_reason (TierOverrideJustification)" \
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'{
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version = 1,
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msg_id = "abcdef01234a",
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prev_msg_hash = "0000000000000000000000000000000000000000000000000000000000000000",
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sender = "claude-7f3a",
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recipient = "gemini-b2c1",
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timestamp = "2026-04-20T10:00:00Z",
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op_kind = "status",
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risk_tier = 3,
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payload = { status = "ok" },
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context_fetch_id = "ctx-abc",
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}' \
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"fail"
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echo
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echo "=== Summary ==="
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echo "Accepted (pass expected): $PASS"
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echo "Rejected (fail expected): $EXPECTED_FAILS"
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echo "Unexpected: $FAIL"
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if [ $FAIL -eq 0 ]; then
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exit 0
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else
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exit 1
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fi

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