feature-flags

Name: feature-flags
Author: BagelHole

80installs4forks

How to install feature-flags?

bagelhole/devops-security-agent-skills/feature-flags

$npx -y skills add BagelHole/DevOps-Security-Agent-Skills --skill feature-flags

Installs into the current project.

Summary

Implement feature flags for progressive feature rollout using LaunchDarkly, Unleash, or custom solutions. Control feature visibility, perform A/B testing, and enable trunk-based development. Use when implementing gradual rollouts, feature toggles, or experimentation platforms.

Files · 1

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SKILL.md

1	# Feature Flags
2
3	Control feature releases and enable progressive rollout with feature flag systems.
4
5	## When to Use This Skill
6
7	Use this skill when:
8	- Implementing gradual feature rollouts
9	- Enabling trunk-based development
10	- Running A/B tests and experiments
11	- Managing feature lifecycles
12	- Implementing kill switches for production
13
14	## Prerequisites
15
16	- Application code access
17	- Feature flag service or self-hosted solution
18	- Basic understanding of deployment patterns
19
20	## Feature Flag Types
21
22	\| Type \| Purpose \| Example \|
23	\|------\|---------\|---------\|
24	\| Release \| Control feature visibility \| New checkout flow \|
25	\| Experiment \| A/B testing \| Button color test \|
26	\| Ops \| Runtime configuration \| Rate limiting \|
27	\| Permission \| User access control \| Premium features \|
28	\| Kill Switch \| Emergency disable \| Third-party integration \|
29
30	## LaunchDarkly
31
32	### SDK Setup (Node.js)
33
34	```javascript
35	const LaunchDarkly = require('launchdarkly-node-server-sdk');
36
37	const client = LaunchDarkly.init(process.env.LAUNCHDARKLY_SDK_KEY);
38
39	await client.waitForInitialization();
40
41	// Evaluate flag
42	const user = {
43	key: 'user-123',
44	email: 'user@example.com',
45	custom: {
46	plan: 'premium',
47	company: 'acme'
48	}
49	};
50
51	const showNewFeature = await client.variation('new-checkout', user, false);
52
53	if (showNewFeature) {
54	// New feature code
55	} else {
56	// Existing code
57	}
58	```
59
60	### React SDK
61
62	```javascript
63	import { withLDProvider, useFlags, useLDClient } from 'launchdarkly-react-client-sdk';
64
65	// Provider setup
66	export default withLDProvider({
67	clientSideID: 'your-client-side-id',
68	user: {
69	key: 'user-123',
70	email: 'user@example.com'
71	}
72	})(App);
73
74	// Using flags in component
75	function FeatureComponent() {
76	const { newCheckout, experimentVariant } = useFlags();
77	const ldClient = useLDClient();
78
79	// Track events
80	const handleClick = () => {
81	ldClient.track('checkout-started');
82	};
83
84	if (newCheckout) {
85	return <NewCheckout onClick={handleClick} />;
86	}
87	return <OldCheckout onClick={handleClick} />;
88	}
89	```
90
91	### Targeting Rules
92
93	```yaml
94	# LaunchDarkly targeting configuration
95	flag: new-checkout
96	targeting:
97	# Individual users
98	targets:
99	- variation: true
100	values: ['user-123', 'user-456']
101
102	# Rules
103	rules:
104	# Beta users
105	- variation: true
106	clauses:
107	- attribute: email
108	op: endsWith
109	values: ['@company.com']
110
111	# Premium plan
112	- variation: true
113	clauses:
114	- attribute: plan
115	op: in
116	values: ['premium', 'enterprise']
117
118	# Percentage rollout
119	- variation: true
120	rollout:
121	variations:
122	- variation: true
123	weight: 20000 # 20%
124	- variation: false
125	weight: 80000 # 80%
126
127	# Default
128	fallthrough:
129	variation: false
130	```
131
132	## Unleash
133
134	### Server Setup
135
136	```yaml
137	# docker-compose.yml
138	version: '3.8'
139
140	services:
141	unleash:
142	image: unleashorg/unleash-server:latest
143	ports:
144	- "4242:4242"
145	environment:
146	- DATABASE_URL=postgres://postgres:password@db/unleash
147	- DATABASE_SSL=false
148	depends_on:
149	- db
150
151	db:
152	image: postgres:15
153	environment:
154	- POSTGRES_PASSWORD=password
155	- POSTGRES_DB=unleash
156	volumes:
157	- postgres-data:/var/lib/postgresql/data
158
159	volumes:
160	postgres-data:
161	```
162
163	### SDK Setup (Node.js)
164
165	```javascript
166	const { initialize } = require('unleash-client');
167
168	const unleash = initialize({
169	url: 'http://localhost:4242/api',
170	appName: 'my-app',
171	customHeaders: {
172	Authorization: 'your-api-token'
173	}
174	});
175
176	unleash.on('ready', () => {
177	// Check feature
178	const isEnabled = unleash.isEnabled('new-checkout');
179
180	// With context
181	const context = {
182	userId: 'user-123',
183	properties: {
184	plan: 'premium'
185	}
186	};
187
188	const isEnabledForUser = unleash.isEnabled('new-checkout', context);
189
190	// Get variant
191	const variant = unleash.getVariant('experiment-flag', context);
192	console.log(variant.name); // 'control' or 'treatment'
193	});
194	```
195
196	### Activation Strategies
197
198	```yaml
199	# Standard strategies
200	strategies:
201	- name: default
202	# On/off for everyone
203
204	- name: userWithId
205	parameters:
206	userIds: 'user-1,user-2,user-3'
207
208	- name: gradualRolloutUserId
209	parameters:
210	percentage: 25
211	groupId: 'new-feature'
212
213	- name: gradualRolloutRandom
214	parameters:
215	percentage: 50
216
217	- name: flexibleRollout
218	parameters:
219	rollout: 30
220	stickiness: userId
221	groupId: 'checkout-exp'
222	```
223
224	## Custom Implementation
225
226	### Database-Backed Flags
227
228	```python
229	# models.py
230	from django.db import models
231
232	class FeatureFlag(models.Model):
233	name = models.Cha

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Type

feature-flags

80installs4forks

View on GitHub

How to install feature-flags?

bagelhole/devops-security-agent-skills/feature-flags

$npx -y skills add BagelHole/DevOps-Security-Agent-Skills --skill feature-flags

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Feature Flags
2
3	Control feature releases and enable progressive rollout with feature flag systems.
4
5	## When to Use This Skill
6
7	Use this skill when:
8	- Implementing gradual feature rollouts
9	- Enabling trunk-based development
10	- Running A/B tests and experiments
11	- Managing feature lifecycles
12	- Implementing kill switches for production
13
14	## Prerequisites
15
16	- Application code access
17	- Feature flag service or self-hosted solution
18	- Basic understanding of deployment patterns
19
20	## Feature Flag Types
21
22	\| Type \| Purpose \| Example \|
23	\|------\|---------\|---------\|
24	\| Release \| Control feature visibility \| New checkout flow \|
25	\| Experiment \| A/B testing \| Button color test \|
26	\| Ops \| Runtime configuration \| Rate limiting \|
27	\| Permission \| User access control \| Premium features \|
28	\| Kill Switch \| Emergency disable \| Third-party integration \|
29
30	## LaunchDarkly
31
32	### SDK Setup (Node.js)
33
34	```javascript
35	const LaunchDarkly = require('launchdarkly-node-server-sdk');
36
37	const client = LaunchDarkly.init(process.env.LAUNCHDARKLY_SDK_KEY);
38
39	await client.waitForInitialization();
40
41	// Evaluate flag
42	const user = {
43	key: 'user-123',
44	email: 'user@example.com',
45	custom: {
46	plan: 'premium',
47	company: 'acme'
48	}
49	};
50
51	const showNewFeature = await client.variation('new-checkout', user, false);
52
53	if (showNewFeature) {
54	// New feature code
55	} else {
56	// Existing code
57	}
58	```
59
60	### React SDK
61
62	```javascript
63	import { withLDProvider, useFlags, useLDClient } from 'launchdarkly-react-client-sdk';
64
65	// Provider setup
66	export default withLDProvider({
67	clientSideID: 'your-client-side-id',
68	user: {
69	key: 'user-123',
70	email: 'user@example.com'
71	}
72	})(App);
73
74	// Using flags in component
75	function FeatureComponent() {
76	const { newCheckout, experimentVariant } = useFlags();
77	const ldClient = useLDClient();
78
79	// Track events
80	const handleClick = () => {
81	ldClient.track('checkout-started');
82	};
83
84	if (newCheckout) {
85	return <NewCheckout onClick={handleClick} />;
86	}
87	return <OldCheckout onClick={handleClick} />;
88	}
89	```
90
91	### Targeting Rules
92
93	```yaml
94	# LaunchDarkly targeting configuration
95	flag: new-checkout
96	targeting:
97	# Individual users
98	targets:
99	- variation: true
100	values: ['user-123', 'user-456']
101
102	# Rules
103	rules:
104	# Beta users
105	- variation: true
106	clauses:
107	- attribute: email
108	op: endsWith
109	values: ['@company.com']
110
111	# Premium plan
112	- variation: true
113	clauses:
114	- attribute: plan
115	op: in
116	values: ['premium', 'enterprise']
117
118	# Percentage rollout
119	- variation: true
120	rollout:
121	variations:
122	- variation: true
123	weight: 20000 # 20%
124	- variation: false
125	weight: 80000 # 80%
126
127	# Default
128	fallthrough:
129	variation: false
130	```
131
132	## Unleash
133
134	### Server Setup
135
136	```yaml
137	# docker-compose.yml
138	version: '3.8'
139
140	services:
141	unleash:
142	image: unleashorg/unleash-server:latest
143	ports:
144	- "4242:4242"
145	environment:
146	- DATABASE_URL=postgres://postgres:password@db/unleash
147	- DATABASE_SSL=false
148	depends_on:
149	- db
150
151	db:
152	image: postgres:15
153	environment:
154	- POSTGRES_PASSWORD=password
155	- POSTGRES_DB=unleash
156	volumes:
157	- postgres-data:/var/lib/postgresql/data
158
159	volumes:
160	postgres-data:
161	```
162
163	### SDK Setup (Node.js)
164
165	```javascript
166	const { initialize } = require('unleash-client');
167
168	const unleash = initialize({
169	url: 'http://localhost:4242/api',
170	appName: 'my-app',
171	customHeaders: {
172	Authorization: 'your-api-token'
173	}
174	});
175
176	unleash.on('ready', () => {
177	// Check feature
178	const isEnabled = unleash.isEnabled('new-checkout');
179
180	// With context
181	const context = {
182	userId: 'user-123',
183	properties: {
184	plan: 'premium'
185	}
186	};
187
188	const isEnabledForUser = unleash.isEnabled('new-checkout', context);
189
190	// Get variant
191	const variant = unleash.getVariant('experiment-flag', context);
192	console.log(variant.name); // 'control' or 'treatment'
193	});
194	```
195
196	### Activation Strategies
197
198	```yaml
199	# Standard strategies
200	strategies:
201	- name: default
202	# On/off for everyone
203
204	- name: userWithId
205	parameters:
206	userIds: 'user-1,user-2,user-3'
207
208	- name: gradualRolloutUserId
209	parameters:
210	percentage: 25
211	groupId: 'new-feature'
212
213	- name: gradualRolloutRandom
214	parameters:
215	percentage: 50
216
217	- name: flexibleRollout
218	parameters:
219	rollout: 30
220	stickiness: userId
221	groupId: 'checkout-exp'
222	```
223
224	## Custom Implementation
225
226	### Database-Backed Flags
227
228	```python
229	# models.py
230	from django.db import models
231
232	class FeatureFlag(models.Model):
233	name = models.Cha

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Type