diff --git a/.changeset/core-package-config.md b/.changeset/core-package-config.md
new file mode 100644
index 0000000..14de713
--- /dev/null
+++ b/.changeset/core-package-config.md
@@ -0,0 +1,10 @@
+---
+'@ocpp-debugkit/core': minor
+---
+
+Finalize core package for npm publishing.
+
+- Add `sideEffects: false` for tree-shaking
+- Add `files` field to limit published content
+- Add `keywords`, `repository`, `homepage`, `bugs` fields for npm discoverability
+- Verify barrel export is complete (types, schemas, parser, normalizer, timeline, detection, summarizer, validator, fixtures)
diff --git a/CURRENT_STATE.md b/CURRENT_STATE.md
index aa9daf1..11419ce 100644
--- a/CURRENT_STATE.md
+++ b/CURRENT_STATE.md
@@ -69,7 +69,7 @@ report exported. CLI and web inspector.
 - ✅ `packages/core/src/types.ts` — updated with `Failure`, `Scenario`, `SessionSummary`, `ValidationResult` types
 - ✅ 78 unit tests (46 normalizer + 32 parser)
 
-### Core Package — Timeline + Detection + Summarizer + Validator (in progress — this PR)
+### Core Package — Timeline + Detection + Summarizer + Validator (PR #34)
 
 - ✅ `packages/core/src/timeline.ts` — `buildSessionTimeline()` correlating events by `transactionId` (ADR-0006)
 - ✅ `packages/core/src/detection.ts` — `detectFailures()` with 3 rules: `FAILED_AUTHORIZATION`, `CONNECTOR_FAULT`, `STATION_OFFLINE_DURING_SESSION`
@@ -77,11 +77,19 @@ report exported. CLI and web inspector.
 - ✅ `packages/core/src/validator.ts` — `validateMessage()` / `validateMessages()` checking OCPP 1.6 JSON structural compliance
 - ✅ 40 additional tests (10 timeline + 11 detection + 5 summarizer + 14 validator)
 
+### Core Package — Public API Export + Package Config (in progress — this PR)
+
+- ✅ Barrel export complete (types, schemas, parser, normalizer, timeline, detection, summarizer, validator, fixtures)
+- ✅ `sideEffects: false` for tree-shaking
+- ✅ `files` field limits published content to `dist/` + docs
+- ✅ `keywords`, `repository`, `homepage`, `bugs` fields for npm discoverability
+- ✅ Package is npm-publish-ready (`access: public`)
+
 ## What's Next
 
 1. **Issue #20** → complete (PR #33): data model + parser + normalizer
-2. **Issue #21** (this PR) → complete: timeline + detection + summarizer + validator
-3. **Issue #22**: Core public API export + package config
+2. **Issue #21** → complete (PR #34): timeline + detection + summarizer + validator
+3. **Issue #22** (this PR) → complete: public API export + package config
 4. **Issue #23**: Scenarios package (format + 5 initial scenarios)
 5. **Issue #24**: Reporter package (Markdown report generator)
 6. **Issue #25**: CLI package (scaffold + inspect + report + scenario commands)
@@ -94,7 +102,7 @@ report exported. CLI and web inspector.
 
 | Package | Status | Version |
 |---------|--------|---------|
-| `@ocpp-debugkit/core` | in progress (parser + timeline + detection + summarizer + validator) | 0.0.0 |
+| `@ocpp-debugkit/core` | in progress (package config finalized, ready for downstream) | 0.0.0 |
 | `@ocpp-debugkit/scenarios` | not started | — |
 | `@ocpp-debugkit/reporter` | not started | — |
 | `@ocpp-debugkit/cli` | not started | — |
diff --git a/packages/core/package.json b/packages/core/package.json
index 14b2ece..d62d7b1 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -4,6 +4,7 @@
   "description": "Core data model, parser, normalizer, timeline, and failure detection for OCPP DebugKit.",
   "license": "Apache-2.0",
   "type": "module",
+  "sideEffects": false,
   "main": "./dist/index.js",
   "module": "./dist/index.js",
   "types": "./dist/index.d.ts",
@@ -17,6 +18,30 @@
       "import": "./dist/fixtures/index.js"
     }
   },
+  "files": [
+    "dist",
+    "README.md",
+    "NOTICE"
+  ],
+  "keywords": [
+    "ocpp",
+    "ocpp1.6",
+    "ev-charging",
+    "charge-point",
+    "csms",
+    "debugging",
+    "trace-parser",
+    "failure-detection"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ocpp-debugkit/ocpp-debugkit.git",
+    "directory": "packages/core"
+  },
+  "homepage": "https://github.com/ocpp-debugkit/ocpp-debugkit/tree/main/packages/core",
+  "bugs": {
+    "url": "https://github.com/ocpp-debugkit/ocpp-debugkit/issues"
+  },
   "scripts": {
     "build": "tsc -p tsconfig.json",
     "typecheck": "tsc --noEmit",