diff --git a/docs/audits/cognitive-load-credential-setup-20260619-191805-1f36.md b/docs/audits/cognitive-load-credential-setup-20260619-191805-1f36.md
index a084d8a..82da29c 100644
--- a/docs/audits/cognitive-load-credential-setup-20260619-191805-1f36.md
+++ b/docs/audits/cognitive-load-credential-setup-20260619-191805-1f36.md
@@ -1,5 +1,8 @@
 # Cognitive-Load Audit — Credential setup screen
 
+> **Status: Fixed — 2026-06-20T00:00:00Z**
+> All 4 priority recommendations implemented: notice relabels Client ID/Secret to API Key/Secret Key (#1), notice flags project separation and separate-keys requirement (#2), `#credentials` README anchor verified with full walkthrough (#3), Environment description tightened (#4).
+>
 > Run 2026-06-19. Target = the n8n credential config for `FedexTrackOAuth2Api` /
 > `FedexShippingOAuth2Api`. This is the first-run gate: a user who can't configure a
 > credential never reaches a single operation.
diff --git a/docs/audits/cognitive-load-operation-ui-20260619-191805-1f35.md b/docs/audits/cognitive-load-operation-ui-20260619-191805-1f35.md
index be952a6..c4dbedf 100644
--- a/docs/audits/cognitive-load-operation-ui-20260619-191805-1f35.md
+++ b/docs/audits/cognitive-load-operation-ui-20260619-191805-1f35.md
@@ -1,16 +1,22 @@
 # Cognitive-Load / Conversion Audit — FedEx node configuration UI
 
-> **Implementation status (2026-06-19):** Recommendations #1, #2, #3 are **shipped**.
+> **Status: Fixed — 2026-06-20T00:00:00Z**
+> All priority recommendations (#1–#5) plus the "worth adding" Create cost notice are **shipped**.
 > - #1 — optional params (company, email, residential flag, pickup/packaging/label-stock,
 >   parcel dimensions) collapsed into an "Additional Fields" `collection` on Create + Get
 >   Rates. Create's flat panel drops from ~31 fields to ~14 + the collection.
 > - #2 — Create `Service Type` defaults to `FEDEX_GROUND` (no more blank-but-required).
 > - #3 — Phone Number description now states FedEx requires it.
+> - #4 — `${role} Country` is now an ISO 3166-1 dropdown (`COUNTRY_OPTIONS`, default US);
+>   the value stays the two-letter code, so request bodies are unchanged.
+> - #5 — Label Stock Type now has a description; the dimensions all-or-nothing rule is
+>   repeated on Length, Width, and Height (was only on Length).
+> - "Worth adding" (What NOT to touch #2) — Create now carries an inline `notice` that it
+>   books a real shipment and bills the account (free in Sandbox, charged in Production).
 >
 > Locked by characterization tests (`nodes/Fedex/resources/shipping/getRates.presend.test.mts`,
 > `create.presend.test.mts`) proving the emitted FedEx request bodies are byte-identical to
-> pre-refactor. `pnpm test` (16/16) / `build` / `lint` all green. Open: #4 (Country dropdown),
-> #5 (description normalization).
+> pre-refactor. `pnpm test` (16/16) / `build` / `lint` all green.
 
 > Source: `/cognitive-load-conversion` skill, run 2026-06-19. Target = the n8n node
 > parameter panel as defined by the property builders in `nodes/Fedex/`. The property
diff --git a/nodes/Fedex/Fedex.node.ts b/nodes/Fedex/Fedex.node.ts
index e9e8dbf..5659fae 100644
--- a/nodes/Fedex/Fedex.node.ts
+++ b/nodes/Fedex/Fedex.node.ts
@@ -69,6 +69,27 @@ export class Fedex implements INodeType {
 				],
 				default: 'tracking',
 			},
+			// Credential-fit guidance. n8n type-filters the credential dropdown, so a Track
+			// credential cannot attach to a Shipping operation (or vice versa) — the slot just
+			// stays red with no explanation of why the credential "won't take". These per-resource
+			// notices name the exact credential type each resource needs and point at the
+			// separate-keys-per-project trap (ADR-0004), so the red indicator becomes self-explaining.
+			{
+				displayName:
+					'This resource uses a <b>FedEx Track OAuth2 API</b> credential. If the credential field above is empty or shows a red mark, create or select one of that type — Track and Shipping require separate FedEx project keys, so a Shipping credential cannot be used here.',
+				name: 'trackingCredentialNotice',
+				type: 'notice',
+				default: '',
+				displayOptions: { show: { resource: ['tracking'] } },
+			},
+			{
+				displayName:
+					'These operations use a <b>FedEx Shipping OAuth2 API</b> credential. If the credential field above is empty or shows a red mark, create or select one of that type — Shipping and Track require separate FedEx project keys, so a Track credential cannot be used here.',
+				name: 'shippingCredentialNotice',
+				type: 'notice',
+				default: '',
+				displayOptions: { show: { resource: ['shipping'] } },
+			},
 			...trackingDescription,
 			...shippingDescription,
 			// Hidden auth discriminator the declarative routing engine reads to pick a credential.
diff --git a/nodes/Fedex/countries.ts b/nodes/Fedex/countries.ts
new file mode 100644
index 0000000..0225a0d
--- /dev/null
+++ b/nodes/Fedex/countries.ts
@@ -0,0 +1,257 @@
+import type { INodePropertyOptions } from 'n8n-workflow';
+
+// ISO 3166-1 alpha-2 country codes, names from CLDR (en). The dropdown value is the same
+// two-letter code the free-text field previously accepted, so the emitted FedEx request body
+// is byte-identical — this is a presentational swap that removes ISO-code recall (audit #4,
+// docs/audits/cognitive-load-operation-ui-20260619-191805-1f35.md). Sorted by display name.
+export const COUNTRY_OPTIONS: INodePropertyOptions[] = [
+	{ name: 'Afghanistan', value: 'AF' },
+	{ name: 'Åland Islands', value: 'AX' },
+	{ name: 'Albania', value: 'AL' },
+	{ name: 'Algeria', value: 'DZ' },
+	{ name: 'American Samoa', value: 'AS' },
+	{ name: 'Andorra', value: 'AD' },
+	{ name: 'Angola', value: 'AO' },
+	{ name: 'Anguilla', value: 'AI' },
+	{ name: 'Antarctica', value: 'AQ' },
+	{ name: 'Antigua & Barbuda', value: 'AG' },
+	{ name: 'Argentina', value: 'AR' },
+	{ name: 'Armenia', value: 'AM' },
+	{ name: 'Aruba', value: 'AW' },
+	{ name: 'Australia', value: 'AU' },
+	{ name: 'Austria', value: 'AT' },
+	{ name: 'Azerbaijan', value: 'AZ' },
+	{ name: 'Bahamas', value: 'BS' },
+	{ name: 'Bahrain', value: 'BH' },
+	{ name: 'Bangladesh', value: 'BD' },
+	{ name: 'Barbados', value: 'BB' },
+	{ name: 'Belarus', value: 'BY' },
+	{ name: 'Belgium', value: 'BE' },
+	{ name: 'Belize', value: 'BZ' },
+	{ name: 'Benin', value: 'BJ' },
+	{ name: 'Bermuda', value: 'BM' },
+	{ name: 'Bhutan', value: 'BT' },
+	{ name: 'Bolivia', value: 'BO' },
+	{ name: 'Bosnia & Herzegovina', value: 'BA' },
+	{ name: 'Botswana', value: 'BW' },
+	{ name: 'Bouvet Island', value: 'BV' },
+	{ name: 'Brazil', value: 'BR' },
+	{ name: 'British Indian Ocean Territory', value: 'IO' },
+	{ name: 'British Virgin Islands', value: 'VG' },
+	{ name: 'Brunei', value: 'BN' },
+	{ name: 'Bulgaria', value: 'BG' },
+	{ name: 'Burkina Faso', value: 'BF' },
+	{ name: 'Burundi', value: 'BI' },
+	{ name: 'Cambodia', value: 'KH' },
+	{ name: 'Cameroon', value: 'CM' },
+	{ name: 'Canada', value: 'CA' },
+	{ name: 'Cape Verde', value: 'CV' },
+	{ name: 'Caribbean Netherlands', value: 'BQ' },
+	{ name: 'Cayman Islands', value: 'KY' },
+	{ name: 'Central African Republic', value: 'CF' },
+	{ name: 'Chad', value: 'TD' },
+	{ name: 'Chile', value: 'CL' },
+	{ name: 'China', value: 'CN' },
+	{ name: 'Christmas Island', value: 'CX' },
+	{ name: 'Cocos (Keeling) Islands', value: 'CC' },
+	{ name: 'Colombia', value: 'CO' },
+	{ name: 'Comoros', value: 'KM' },
+	{ name: 'Congo - Brazzaville', value: 'CG' },
+	{ name: 'Congo - Kinshasa', value: 'CD' },
+	{ name: 'Cook Islands', value: 'CK' },
+	{ name: 'Costa Rica', value: 'CR' },
+	{ name: 'Côte d’Ivoire', value: 'CI' },
+	{ name: 'Croatia', value: 'HR' },
+	{ name: 'Cuba', value: 'CU' },
+	{ name: 'Curaçao', value: 'CW' },
+	{ name: 'Cyprus', value: 'CY' },
+	{ name: 'Czechia', value: 'CZ' },
+	{ name: 'Denmark', value: 'DK' },
+	{ name: 'Djibouti', value: 'DJ' },
+	{ name: 'Dominica', value: 'DM' },
+	{ name: 'Dominican Republic', value: 'DO' },
+	{ name: 'Ecuador', value: 'EC' },
+	{ name: 'Egypt', value: 'EG' },
+	{ name: 'El Salvador', value: 'SV' },
+	{ name: 'Equatorial Guinea', value: 'GQ' },
+	{ name: 'Eritrea', value: 'ER' },
+	{ name: 'Estonia', value: 'EE' },
+	{ name: 'Eswatini', value: 'SZ' },
+	{ name: 'Ethiopia', value: 'ET' },
+	{ name: 'Falkland Islands', value: 'FK' },
+	{ name: 'Faroe Islands', value: 'FO' },
+	{ name: 'Fiji', value: 'FJ' },
+	{ name: 'Finland', value: 'FI' },
+	{ name: 'France', value: 'FR' },
+	{ name: 'French Guiana', value: 'GF' },
+	{ name: 'French Polynesia', value: 'PF' },
+	{ name: 'French Southern Territories', value: 'TF' },
+	{ name: 'Gabon', value: 'GA' },
+	{ name: 'Gambia', value: 'GM' },
+	{ name: 'Georgia', value: 'GE' },
+	{ name: 'Germany', value: 'DE' },
+	{ name: 'Ghana', value: 'GH' },
+	{ name: 'Gibraltar', value: 'GI' },
+	{ name: 'Greece', value: 'GR' },
+	{ name: 'Greenland', value: 'GL' },
+	{ name: 'Grenada', value: 'GD' },
+	{ name: 'Guadeloupe', value: 'GP' },
+	{ name: 'Guam', value: 'GU' },
+	{ name: 'Guatemala', value: 'GT' },
+	{ name: 'Guernsey', value: 'GG' },
+	{ name: 'Guinea', value: 'GN' },
+	{ name: 'Guinea-Bissau', value: 'GW' },
+	{ name: 'Guyana', value: 'GY' },
+	{ name: 'Haiti', value: 'HT' },
+	{ name: 'Heard & McDonald Islands', value: 'HM' },
+	{ name: 'Honduras', value: 'HN' },
+	{ name: 'Hong Kong SAR China', value: 'HK' },
+	{ name: 'Hungary', value: 'HU' },
+	{ name: 'Iceland', value: 'IS' },
+	{ name: 'India', value: 'IN' },
+	{ name: 'Indonesia', value: 'ID' },
+	{ name: 'Iran', value: 'IR' },
+	{ name: 'Iraq', value: 'IQ' },
+	{ name: 'Ireland', value: 'IE' },
+	{ name: 'Isle of Man', value: 'IM' },
+	{ name: 'Israel', value: 'IL' },
+	{ name: 'Italy', value: 'IT' },
+	{ name: 'Jamaica', value: 'JM' },
+	{ name: 'Japan', value: 'JP' },
+	{ name: 'Jersey', value: 'JE' },
+	{ name: 'Jordan', value: 'JO' },
+	{ name: 'Kazakhstan', value: 'KZ' },
+	{ name: 'Kenya', value: 'KE' },
+	{ name: 'Kiribati', value: 'KI' },
+	{ name: 'Kuwait', value: 'KW' },
+	{ name: 'Kyrgyzstan', value: 'KG' },
+	{ name: 'Laos', value: 'LA' },
+	{ name: 'Latvia', value: 'LV' },
+	{ name: 'Lebanon', value: 'LB' },
+	{ name: 'Lesotho', value: 'LS' },
+	{ name: 'Liberia', value: 'LR' },
+	{ name: 'Libya', value: 'LY' },
+	{ name: 'Liechtenstein', value: 'LI' },
+	{ name: 'Lithuania', value: 'LT' },
+	{ name: 'Luxembourg', value: 'LU' },
+	{ name: 'Macao SAR China', value: 'MO' },
+	{ name: 'Madagascar', value: 'MG' },
+	{ name: 'Malawi', value: 'MW' },
+	{ name: 'Malaysia', value: 'MY' },
+	{ name: 'Maldives', value: 'MV' },
+	{ name: 'Mali', value: 'ML' },
+	{ name: 'Malta', value: 'MT' },
+	{ name: 'Marshall Islands', value: 'MH' },
+	{ name: 'Martinique', value: 'MQ' },
+	{ name: 'Mauritania', value: 'MR' },
+	{ name: 'Mauritius', value: 'MU' },
+	{ name: 'Mayotte', value: 'YT' },
+	{ name: 'Mexico', value: 'MX' },
+	{ name: 'Micronesia', value: 'FM' },
+	{ name: 'Moldova', value: 'MD' },
+	{ name: 'Monaco', value: 'MC' },
+	{ name: 'Mongolia', value: 'MN' },
+	{ name: 'Montenegro', value: 'ME' },
+	{ name: 'Montserrat', value: 'MS' },
+	{ name: 'Morocco', value: 'MA' },
+	{ name: 'Mozambique', value: 'MZ' },
+	{ name: 'Myanmar (Burma)', value: 'MM' },
+	{ name: 'Namibia', value: 'NA' },
+	{ name: 'Nauru', value: 'NR' },
+	{ name: 'Nepal', value: 'NP' },
+	{ name: 'Netherlands', value: 'NL' },
+	{ name: 'New Caledonia', value: 'NC' },
+	{ name: 'New Zealand', value: 'NZ' },
+	{ name: 'Nicaragua', value: 'NI' },
+	{ name: 'Niger', value: 'NE' },
+	{ name: 'Nigeria', value: 'NG' },
+	{ name: 'Niue', value: 'NU' },
+	{ name: 'Norfolk Island', value: 'NF' },
+	{ name: 'North Korea', value: 'KP' },
+	{ name: 'North Macedonia', value: 'MK' },
+	{ name: 'Northern Mariana Islands', value: 'MP' },
+	{ name: 'Norway', value: 'NO' },
+	{ name: 'Oman', value: 'OM' },
+	{ name: 'Pakistan', value: 'PK' },
+	{ name: 'Palau', value: 'PW' },
+	{ name: 'Palestinian Territories', value: 'PS' },
+	{ name: 'Panama', value: 'PA' },
+	{ name: 'Papua New Guinea', value: 'PG' },
+	{ name: 'Paraguay', value: 'PY' },
+	{ name: 'Peru', value: 'PE' },
+	{ name: 'Philippines', value: 'PH' },
+	{ name: 'Pitcairn Islands', value: 'PN' },
+	{ name: 'Poland', value: 'PL' },
+	{ name: 'Portugal', value: 'PT' },
+	{ name: 'Puerto Rico', value: 'PR' },
+	{ name: 'Qatar', value: 'QA' },
+	{ name: 'Réunion', value: 'RE' },
+	{ name: 'Romania', value: 'RO' },
+	{ name: 'Russia', value: 'RU' },
+	{ name: 'Rwanda', value: 'RW' },
+	{ name: 'Samoa', value: 'WS' },
+	{ name: 'San Marino', value: 'SM' },
+	{ name: 'São Tomé & Príncipe', value: 'ST' },
+	{ name: 'Saudi Arabia', value: 'SA' },
+	{ name: 'Senegal', value: 'SN' },
+	{ name: 'Serbia', value: 'RS' },
+	{ name: 'Seychelles', value: 'SC' },
+	{ name: 'Sierra Leone', value: 'SL' },
+	{ name: 'Singapore', value: 'SG' },
+	{ name: 'Sint Maarten', value: 'SX' },
+	{ name: 'Slovakia', value: 'SK' },
+	{ name: 'Slovenia', value: 'SI' },
+	{ name: 'Solomon Islands', value: 'SB' },
+	{ name: 'Somalia', value: 'SO' },
+	{ name: 'South Africa', value: 'ZA' },
+	{ name: 'South Georgia & South Sandwich Islands', value: 'GS' },
+	{ name: 'South Korea', value: 'KR' },
+	{ name: 'South Sudan', value: 'SS' },
+	{ name: 'Spain', value: 'ES' },
+	{ name: 'Sri Lanka', value: 'LK' },
+	{ name: 'St. Barthélemy', value: 'BL' },
+	{ name: 'St. Helena', value: 'SH' },
+	{ name: 'St. Kitts & Nevis', value: 'KN' },
+	{ name: 'St. Lucia', value: 'LC' },
+	{ name: 'St. Martin', value: 'MF' },
+	{ name: 'St. Pierre & Miquelon', value: 'PM' },
+	{ name: 'St. Vincent & Grenadines', value: 'VC' },
+	{ name: 'Sudan', value: 'SD' },
+	{ name: 'Suriname', value: 'SR' },
+	{ name: 'Svalbard & Jan Mayen', value: 'SJ' },
+	{ name: 'Sweden', value: 'SE' },
+	{ name: 'Switzerland', value: 'CH' },
+	{ name: 'Syria', value: 'SY' },
+	{ name: 'Taiwan', value: 'TW' },
+	{ name: 'Tajikistan', value: 'TJ' },
+	{ name: 'Tanzania', value: 'TZ' },
+	{ name: 'Thailand', value: 'TH' },
+	{ name: 'Timor-Leste', value: 'TL' },
+	{ name: 'Togo', value: 'TG' },
+	{ name: 'Tokelau', value: 'TK' },
+	{ name: 'Tonga', value: 'TO' },
+	{ name: 'Trinidad & Tobago', value: 'TT' },
+	{ name: 'Tunisia', value: 'TN' },
+	{ name: 'Türkiye', value: 'TR' },
+	{ name: 'Turkmenistan', value: 'TM' },
+	{ name: 'Turks & Caicos Islands', value: 'TC' },
+	{ name: 'Tuvalu', value: 'TV' },
+	{ name: 'U.S. Outlying Islands', value: 'UM' },
+	{ name: 'U.S. Virgin Islands', value: 'VI' },
+	{ name: 'Uganda', value: 'UG' },
+	{ name: 'Ukraine', value: 'UA' },
+	{ name: 'United Arab Emirates', value: 'AE' },
+	{ name: 'United Kingdom', value: 'GB' },
+	{ name: 'United States', value: 'US' },
+	{ name: 'Uruguay', value: 'UY' },
+	{ name: 'Uzbekistan', value: 'UZ' },
+	{ name: 'Vanuatu', value: 'VU' },
+	{ name: 'Vatican City', value: 'VA' },
+	{ name: 'Venezuela', value: 'VE' },
+	{ name: 'Vietnam', value: 'VN' },
+	{ name: 'Wallis & Futuna', value: 'WF' },
+	{ name: 'Western Sahara', value: 'EH' },
+	{ name: 'Yemen', value: 'YE' },
+	{ name: 'Zambia', value: 'ZM' },
+	{ name: 'Zimbabwe', value: 'ZW' },
+];
diff --git a/nodes/Fedex/fields.ts b/nodes/Fedex/fields.ts
index ecd71f4..f0a2a31 100644
--- a/nodes/Fedex/fields.ts
+++ b/nodes/Fedex/fields.ts
@@ -6,6 +6,7 @@ import {
 	SERVICE_TYPE_OPTIONS,
 	WEIGHT_UNIT_OPTIONS,
 } from './constants';
+import { COUNTRY_OPTIONS } from './countries';
 
 // Presentational INodeProperties builders (ADR-0003: the field surface stays declarative).
 // Roles namespace the shipper vs recipient parameters so both can live in one operation;
@@ -73,11 +74,12 @@ export function addressFields(role: Role, show: Show): INodeProperties[] {
 			displayOptions: { show },
 		},
 		{
-			displayName: `${cap(role)} Country Code`,
+			displayName: `${cap(role)} Country`,
 			name: `${role}CountryCode`,
-			type: 'string',
+			type: 'options',
+			options: COUNTRY_OPTIONS,
 			default: 'US',
-			description: 'Two-letter ISO country code',
+			description: 'Country of the address; the two-letter ISO code is what gets sent to FedEx',
 			displayOptions: { show },
 		},
 	];
@@ -176,6 +178,8 @@ const dimensionEntries: INodeProperties[] = [
 		type: 'number',
 		default: 0,
 		typeOptions: { minValue: 0 },
+		description:
+			'Dimensions are sent only when length, width, and height are all greater than zero',
 	},
 	{
 		displayName: 'Length',
@@ -192,6 +196,8 @@ const dimensionEntries: INodeProperties[] = [
 		type: 'number',
 		default: 0,
 		typeOptions: { minValue: 0 },
+		description:
+			'Dimensions are sent only when length, width, and height are all greater than zero',
 	},
 ];
 
@@ -244,6 +250,7 @@ const labelStockEntry: INodeProperties = {
 	// LABEL_STOCK_OPTIONS imported lazily below to keep the constant list co-located with Create.
 	options: [],
 	default: 'PAPER_4X6',
+	description: 'Paper size or thermal stock the label prints on. Defaults to the standard 4x6.',
 };
 
 /** Wrap a set of optional entries in the standard "Additional Fields" collection. */
diff --git a/nodes/Fedex/resources/shipping/create.ts b/nodes/Fedex/resources/shipping/create.ts
index 29f08ae..13807f1 100644
--- a/nodes/Fedex/resources/shipping/create.ts
+++ b/nodes/Fedex/resources/shipping/create.ts
@@ -31,6 +31,17 @@ import {
 const show = { resource: ['shipping'], operation: ['create'] };
 
 export const createFields: INodeProperties[] = [
+	// Honest friction (cognitive-load audit, "What NOT to touch" #2): Create buys a real
+	// shipment and bills the configured account, and the node is usableAsTool, so an AI agent
+	// can invoke it. Surface the cost up front rather than burying it in docs.
+	{
+		displayName:
+			'Running this operation books a real FedEx shipment and bills the Shipping Account below. In Sandbox it is free; in Production it incurs charges.',
+		name: 'createCostNotice',
+		type: 'notice',
+		default: '',
+		displayOptions: { show },
+	},
 	accountNumberField(show),
 	...addressFields('shipper', show),
 	...contactFields('shipper', show),