diff --git a/packages/cosmic-swingset/Makefile b/packages/cosmic-swingset/Makefile
index 1bfb44a18e9..dc11b30c07b 100644
--- a/packages/cosmic-swingset/Makefile
+++ b/packages/cosmic-swingset/Makefile
@@ -5,6 +5,7 @@ INITIAL_HEIGHT = 17
 GENESIS_TIME = $(shell TZ=UTC date +%Y-%m-%dT%H:%M:%SZ)
 
 GOSRC = ../../golang/cosmos
+AG_SOLO = $(shell cd ../solo/bin && pwd)/ag-solo
 
 # By default, make the fake chain in scenario3 produce
 # "blocks" as soon as they come in.
@@ -32,7 +33,7 @@ scenario0-setup:
 	rm -rf t9/$(BASE_PORT)
 
 scenario0-run scenario0-run-client:
-	AG_SOLO_BASEDIR=$$PWD/t9/$(BASE_PORT) bin/ag-solo setup --webport=$(BASE_PORT)
+	AG_SOLO_BASEDIR=$$PWD/t9/$(BASE_PORT) $(AG_SOLO) setup --webport=$(BASE_PORT)
 scenario0-run-chain:
 	@echo 'We use the Agoric testnet, not a local chain.'
 
@@ -43,7 +44,7 @@ scenario1-run-chain:
 	AG_SETUP_COSMOS_HOME=t8 ../deployment/ag-setup-cosmos bootstrap
 
 scenario1-run-client:
-	AG_SOLO_BASEDIR=$$PWD/t9/$(BASE_PORT) bin/ag-solo setup --network-config=http://localhost:8001/network-config --webport=$(BASE_PORT)
+	AG_SOLO_BASEDIR=$$PWD/t9/$(BASE_PORT) $(AG_SOLO) setup --network-config=http://localhost:8001/network-config --webport=$(BASE_PORT)
 
 AGC = ./bin/ag-chain-cosmos
 AGCH = ag-cosmos-helper
@@ -55,7 +56,7 @@ scenario2-setup-nobuild:
 	$(AGCH) --home=t1/n0 init scenario2-chain --chain-id=$(CHAIN_ID)
 	# Init all the ag-solos.
 	set -e; for port in `seq $(BASE_PORT) $$(($(BASE_PORT) + $(NUM_SOLOS) - 1))`; do \
-		bin/ag-solo init t1/$$port --webport=$$port; \
+		$(AG_SOLO) init t1/$$port --webport=$$port; \
 	done
 	# Create the bootstrap account.
 	$(AGCH) --home=t1/bootstrap keys add bootstrap --keyring-backend=test
@@ -97,7 +98,7 @@ t1-provision-one:
 
 # Actually start the ag-solo.
 t1-start-ag-solo:
-	cd t1/$(BASE_PORT) && ../../bin/ag-solo start
+	cd t1/$(BASE_PORT) && $(AG_SOLO) start
 
 # scenario3 is a single JS process without any Golang.  However,
 # the client and the chain within the process run two separate
@@ -110,7 +111,7 @@ t1-start-ag-solo:
 VATWORKER=local
 scenario3-setup:
 	rm -rf t3
-	bin/ag-solo init t3 --egresses=fake --webport=$(BASE_PORT) --defaultManagerType=$(VATWORKER)
+	$(AG_SOLO) init t3 --egresses=fake --webport=$(BASE_PORT) --defaultManagerType=$(VATWORKER)
 	@echo 'Execute `make scenario3-run` to run the client and simulated chain'
 
 # This runs both the client and the fake chain.
@@ -118,10 +119,10 @@ scenario3-run-client: scenario3-run
 # Set the fake chain here in case the delay has changed.
 scenario3-run:
 	cd t3 && \
-			../bin/ag-solo set-fake-chain --delay=$(FAKE_CHAIN_DELAY) mySimGCI
+			$(AG_SOLO) set-fake-chain --delay=$(FAKE_CHAIN_DELAY) mySimGCI
 	cd t3 && \
 		OTEL_EXPORTER_PROMETHEUS_PORT=$(OTEL_EXPORTER_PROMETHEUS_PORT) \
-		../bin/ag-solo start
+		$(AG_SOLO) start
 
 docker-pull:
 	for f in '' -setup -solo; do \
@@ -146,8 +147,8 @@ install:
 
 start-ag-solo:
 	rm -rf t1
-	bin/ag-solo init t1
-	cd t1 && ../bin/ag-solo start
+	$(AG_SOLO) init t1
+	cd t1 && $(AG_SOLO) start
 
 show-local-gci:
 	@./calc-gci.js ~/.ag-chain-cosmos/config/genesis.json
@@ -158,5 +159,5 @@ set-local-gci-ingress:
 	rpcport=`./calc-rpcport.js t1/n0/config/config.toml`; \
 	for dir in t1/[0-9]*; do \
 		(cd $$dir && \
-			../../bin/ag-solo set-gci-ingress --chainID=$(CHAIN_ID) $$gci $$rpcport); \
+			$(AG_SOLO) set-gci-ingress --chainID=$(CHAIN_ID) $$gci $$rpcport); \
 	done
diff --git a/packages/cosmic-swingset/bin/ag-chain-cosmos b/packages/cosmic-swingset/bin/ag-chain-cosmos
index 52e84678f87..285fdc5765b 100755
--- a/packages/cosmic-swingset/bin/ag-chain-cosmos
+++ b/packages/cosmic-swingset/bin/ag-chain-cosmos
@@ -10,4 +10,4 @@ while test $# -gt 0; do
   shift
 done
 
-exec node ${nodeFlags[@]} "$thisdir/../lib/chain-entrypoint.js" ${1+"$@"}
+exec node ${nodeFlags[@]} "$thisdir/../src/chain-entrypoint.cjs" ${1+"$@"}
diff --git a/packages/cosmic-swingset/jsconfig.json b/packages/cosmic-swingset/jsconfig.json
index c6b21118112..6aa8279c4c4 100644
--- a/packages/cosmic-swingset/jsconfig.json
+++ b/packages/cosmic-swingset/jsconfig.json
@@ -14,5 +14,5 @@
     "strictNullChecks": true,
     "moduleResolution": "node",
   },
-  "include": ["lib/**/*.js", "exported.js", "globals.d.ts"],
+  "include": ["src/**/*.js", "exported.js"],
 }
diff --git a/packages/cosmic-swingset/package.json b/packages/cosmic-swingset/package.json
index f6e09970314..4961b3c9add 100644
--- a/packages/cosmic-swingset/package.json
+++ b/packages/cosmic-swingset/package.json
@@ -5,7 +5,10 @@
   "parsers": {
     "js": "mjs"
   },
-  "main": "lib/ag-solo/main.js",
+  "bin": {
+    "ag-chain-cosmos": "./src/chain-entrypoint.cjs"
+  },
+  "main": "src/chain-main.js",
   "repository": "https://github.com/Agoric/agoric-sdk",
   "scripts": {
     "build": "exit 0",
@@ -25,53 +28,20 @@
   "license": "Apache-2.0",
   "dependencies": {
     "@agoric/assert": "^0.2.9",
-    "@agoric/babel-parser": "^7.6.4",
-    "@agoric/bundle-source": "^1.3.4",
-    "@agoric/captp": "^1.7.10",
     "@agoric/cosmos": "^0.25.4",
     "@agoric/dapp-svelte-wallet": "^0.9.4",
-    "@agoric/ertp": "^0.10.8",
-    "@agoric/eventual-send": "^0.13.11",
     "@agoric/import-bundle": "^0.2.11",
     "@agoric/install-metering-and-ses": "^0.2.10",
-    "@agoric/install-ses": "^0.5.10",
-    "@agoric/marshal": "^0.4.8",
-    "@agoric/nat": "^4.0.0",
-    "@agoric/notifier": "^0.3.11",
-    "@agoric/pegasus": "^0.2.4",
-    "@agoric/promise-kit": "^0.2.10",
-    "@agoric/registrar": "^0.2.11",
-    "@agoric/same-structure": "^0.1.10",
-    "@agoric/sharing-service": "^0.1.11",
-    "@agoric/sparse-ints": "^0.1.6",
-    "@agoric/spawner": "^0.4.11",
     "@agoric/store": "^0.4.11",
     "@agoric/swing-store-lmdb": "^0.4.9",
-    "@agoric/swing-store-simple": "^0.3.6",
     "@agoric/swingset-vat": "^0.16.4",
-    "@agoric/transform-eventual-send": "^1.4.6",
-    "@agoric/treasury": "^0.3.4",
-    "@agoric/zoe": "^0.15.4",
-    "@babel/generator": "^7.6.4",
+    "@agoric/vats": "^0.1.0",
     "@iarna/toml": "^2.2.3",
     "@opentelemetry/exporter-prometheus": "^0.16.0",
     "@opentelemetry/metrics": "^0.16.0",
     "agoric": "^0.12.13",
     "anylogger": "^0.21.0",
-    "chalk": "^2.4.2",
-    "deterministic-json": "^1.0.5",
-    "esm": "^3.2.25",
-    "express": "^4.17.1",
-    "minimist": "^1.2.0",
-    "morgan": "^1.9.1",
-    "n-readlines": "^1.0.0",
-    "node-fetch": "^2.6.0",
-    "node-lmdb": "^0.9.4",
-    "polycrc": "https://github.com/agoric-labs/node-polycrc",
-    "rollup": "^1.26.2",
-    "rollup-plugin-node-resolve": "^5.2.0",
-    "temp": "^0.9.1",
-    "ws": "^7.2.0"
+    "esm": "^3.2.25"
   },
   "devDependencies": {
     "ava": "^3.12.1",
diff --git a/packages/cosmic-swingset/src/chain-main.js b/packages/cosmic-swingset/src/chain-main.js
index 7cdeba819ca..4d3fe2ad67a 100644
--- a/packages/cosmic-swingset/src/chain-main.js
+++ b/packages/cosmic-swingset/src/chain-main.js
@@ -1,4 +1,4 @@
-/* global __dirname setInterval */
+/* global require setInterval */
 import stringify from '@agoric/swingset-vat/src/kernel/json-stable-stringify';
 import {
   importMailbox,
@@ -77,11 +77,7 @@ const makeChainStorage = (call, prefix = '', imp = x => x, exp = x => x) => {
   return storage;
 };
 
-export default async function main(
-  progname,
-  args,
-  { path, env, homedir, agcc },
-) {
+export default async function main(progname, args, { env, homedir, agcc }) {
   const portNums = {};
 
   // TODO: use the 'basedir' pattern
@@ -224,7 +220,7 @@ export default async function main(
       }
     }
 
-    const vatsdir = path.resolve(__dirname, '../lib/ag-solo/vats');
+    const vatconfig = require.resolve('@agoric/vats/decentral-config.json');
     const argv = {
       ROLE: 'chain',
       noFakeCurrencies: env.NO_FAKE_CURRENCIES,
@@ -235,7 +231,7 @@ export default async function main(
       stateDBDir,
       mailboxStorage,
       doOutboundBridge,
-      vatsdir,
+      vatconfig,
       argv,
       undefined,
       meterProvider,
diff --git a/packages/cosmic-swingset/src/launch-chain.js b/packages/cosmic-swingset/src/launch-chain.js
index 04c37b5bfb6..a60a92cd418 100644
--- a/packages/cosmic-swingset/src/launch-chain.js
+++ b/packages/cosmic-swingset/src/launch-chain.js
@@ -13,7 +13,7 @@ import {
   loadSwingsetConfigFile,
 } from '@agoric/swingset-vat';
 import { assert, details as X } from '@agoric/assert';
-import { getBestSwingStore } from './check-lmdb';
+import { getBestSwingStore } from '@agoric/swing-store-lmdb/check-lmdb';
 import {
   DEFAULT_METER_PROVIDER,
   exportKernelStats,
@@ -32,14 +32,14 @@ async function buildSwingset(
   mailboxStorage,
   bridgeOutbound,
   storage,
-  vatsDir,
+  vatconfig,
   argv,
   { debugName = undefined, slogCallbacks, slogFile },
 ) {
   const debugPrefix = debugName === undefined ? '' : `${debugName}:`;
-  let config = loadSwingsetConfigFile(`${vatsDir}/chain-config.json`);
+  let config = loadSwingsetConfigFile(vatconfig);
   if (config === null) {
-    config = loadBasedir(vatsDir);
+    config = loadBasedir(vatconfig);
   }
   const mbs = buildMailboxStateMap(mailboxStorage);
   const timer = buildTimer();
@@ -89,7 +89,7 @@ export async function launch(
   kernelStateDBDir,
   mailboxStorage,
   bridgeOutbound,
-  vatsDir,
+  vatconfig,
   argv,
   debugName = undefined,
   meterProvider = DEFAULT_METER_PROVIDER,
@@ -115,7 +115,7 @@ export async function launch(
     mailboxStorage,
     bridgeOutbound,
     storage,
-    vatsDir,
+    vatconfig,
     argv,
     {
       debugName,
diff --git a/packages/cosmic-swingset/src/sim-chain.js b/packages/cosmic-swingset/src/sim-chain.js
index 0d070ab89c5..1c8ae8f3db3 100644
--- a/packages/cosmic-swingset/src/sim-chain.js
+++ b/packages/cosmic-swingset/src/sim-chain.js
@@ -1,4 +1,4 @@
-/* global process setTimeout clearTimeout */
+/* global require process setTimeout clearTimeout */
 /* eslint-disable no-await-in-loop */
 import path from 'path';
 import fs from 'fs';
@@ -11,11 +11,11 @@ import {
 import anylogger from 'anylogger';
 
 import { assert, details as X } from '@agoric/assert';
-import { launch } from '../launch-chain';
-import makeBlockManager from '../block-manager';
-import { makeWithQueue } from './vats/queue';
-import { makeBatchedDeliver } from './batched-deliver';
-import { getMeterProvider } from '../kernel-stats';
+import { makeWithQueue } from '@agoric/vats/src/queue';
+import { makeBatchedDeliver } from '@agoric/vats/src/batched-deliver';
+import { launch } from './launch-chain';
+import makeBlockManager from './block-manager';
+import { getMeterProvider } from './kernel-stats';
 
 const console = anylogger('fake-chain');
 
@@ -51,7 +51,7 @@ export async function connectToFakeChain(basedir, GCI, delay, inbound) {
 
   const mailboxStorage = await makeMapStorage(mailboxFile);
 
-  const vatsdir = path.join(basedir, 'vats');
+  const vatconfig = require.resolve('@agoric/vats/decentral-config.json');
   const argv = {
     ROLE: 'sim-chain',
     giveMeAllTheAgoricPowers: true,
@@ -68,7 +68,7 @@ export async function connectToFakeChain(basedir, GCI, delay, inbound) {
     stateDBdir,
     mailboxStorage,
     undefined,
-    vatsdir,
+    vatconfig,
     argv,
     GCI, // debugName
     meterProvider,