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msd-core/tests/hermes-dispatch-upgrade.test.cjs
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JavaScript

// docs-guard-exempt: github.com/.../docs/... is an external URL citation in a comment, not a repo path.
'use strict';
/**
* hermes dispatch UPGRADE — ADR-1239 / #2091.
*
* Hermes' documented delegation model supports `max_spawn_depth: 2` orchestrator
* nesting. The descriptor carries dispatch axes that reflect this. This test
* asserts the negotiation path correctly handles Hermes' dispatch posture,
* including the `shouldFlattenDispatch` behavior and the fail-closed
* degradation when axes are corrupted.
*
* Cite: https://github.com/nousresearch/hermes-agent/blob/main/website/docs/guides/delegation-patterns.md
*/
const { test } = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');
const {
negotiateHostCapabilities,
shouldFlattenDispatch,
degradationFor,
} = require('../msd-core/bin/lib/host-integration.cjs');
const HERMES_CAP = JSON.parse(
fs.readFileSync(path.join(__dirname, '..', 'capabilities', 'hermes', 'capability.json'), 'utf8'),
);
const HERMES_AXES = HERMES_CAP.runtime.hostIntegration;
const HERMES_DISPATCH = HERMES_AXES.dispatch;
test('hermes dispatch axes are populated and internally consistent', () => {
assert.equal(HERMES_DISPATCH.nested, true, 'hermes supports nested dispatch');
assert.ok(HERMES_DISPATCH.maxDepth >= 1, 'maxDepth must be >= 1');
assert.ok(typeof HERMES_DISPATCH.background === 'boolean');
});
test('shouldFlattenDispatch respects hermes dispatch posture', () => {
// Hermes dispatch.nested=true but subagentToolkit='read-only' and
// backgroundDispatch=false — shouldFlattenDispatch must reflect the
// actual capability mix, not just nested=true.
const result = shouldFlattenDispatch(HERMES_DISPATCH);
assert.equal(typeof result, 'boolean',
'shouldFlattenDispatch must return a boolean for hermes dispatch axes');
});
test('degradationFor("dispatch", hermesAxes) returns a valid level', () => {
const deg = degradationFor('dispatch', HERMES_AXES);
assert.ok(deg, 'degradationFor must return a result for dispatch');
assert.ok(['full', 'degraded', 'absent'].includes(deg.level),
`dispatch level must be full/degraded/absent, got: ${deg.level}`);
assert.ok(typeof deg.fallback === 'string');
});
test('corrupted hermes dispatch degrades to safe floor (fail-closed)', () => {
const corrupted = { ...HERMES_AXES, dispatch: { namedDispatch: 'bogus' } };
const result = negotiateHostCapabilities(corrupted);
// With a corrupted dispatch struct, effective must not carry bogus values
assert.equal(typeof result.effective.dispatch.namedDispatch, 'boolean');
assert.equal(result.effective.dispatch.namedDispatch, false,
'corrupted namedDispatch must degrade to false (fail-closed)');
});
test('hermes dispatch never silently upgrades beyond declared capability', () => {
const result = negotiateHostCapabilities(HERMES_AXES);
// effective dispatch must be ⊆ host-declared ∩ engine-known
assert.ok(result.effective.dispatch.maxDepth <= HERMES_DISPATCH.maxDepth,
'effective maxDepth must not exceed host-declared value');
if (HERMES_DISPATCH.backgroundDispatch === false) {
assert.equal(result.effective.dispatch.backgroundDispatch, false,
'effective backgroundDispatch must not be true when host declares false');
}
});