npx skills add ...
npx skills add launchdarkly/agent-skills --skill configs-targeting
npx skills add launchdarkly/agent-skills --skill configs-targeting
Configure config targeting rules to control which variations serve to different users. Enable percentage rollouts, attribute-based rules, segment targeting, and guarded rollouts.
Configure targeting rules for configs to control which variations serve to different contexts. Works the same for both completion and agent mode.
configs-create skill)LAUNCHDARKLY_API_KEY, LAUNCHDARKLY_API_TOKEN, LD_API_KEY~/.claude/config.json -> mcpServers.launchdarkly.env.LAUNCHDARKLY_API_KEYTargeting rules evaluate in this order (same as feature flags):
config targeting uses semantic patch instructions:
Response includes variations array with _id (UUID) for each variation.
Edit the default rule to serve the variation you created.
Important: The
turnTargetingOninstruction does not work for configs. UseupdateFallthroughVariationOrRolloutinstead.
Attribute-based rule:
Percentage rollout:
Set fallthrough (default rule):
Note:
turnTargetingOnandturnTargetingOffdo not work for configs. Configs have targeting enabled by default. To "enable" a config, set the fallthrough to an enabled variation usingupdateFallthroughVariationOrRollout.
| Kind | Description |
|---|---|
addRule | Add rule with clauses and variation/rollout |
removeRule | Remove by ruleId |
replaceRules | Replace all rules |
reorderRules | Change evaluation order |
updateRuleVariationOrRollout | Update what a rule serves |
| Kind | Description |
|---|---|
updateFallthroughVariationOrRollout | Set default variation or rollout |
| Kind | Description |
|---|---|
addTargets | Target specific context keys |
removeTargets | Remove specific targets |
replaceTargets | Replace all targets |
| Operator | Description | Example |
|---|---|---|
in | Value in list | ["premium", "enterprise"] |
contains | String contains | ["sonnet"] |
startsWith | String prefix | ["user-"] |
endsWith | String suffix | [".edu"] |
matches | Regex match | ["^user-\\d+$"] |
greaterThan / lessThan | Numeric comparison | [100] |
before / after | Date comparison | ["2024-12-31T00:00:00Z"] |
semVerEqual / semVerGreaterThan | Version comparison | ["2.0.0"] |
segmentMatch | Segment membership | ["beta-testers"] |
negate: true inverts the operator| Status | Cause | Solution |
|---|---|---|
| 400 | Invalid semantic patch | Check instruction format, ops must be lowercase |
| 403 | Insufficient permissions | Check API token |
| 404 | Config not found | Verify projectKey and configKey |
| 422 | Invalid variation | Use index (0, 1, 2...) or UUID from targeting response |
After configuring targeting:
built-in-metricsonline-evalsconfigs-create - Create configs with variationsconfigs-variations - Manage variationsonline-evals - Attach judgessegments - Create segments for targetingcurl -X PATCH "https://app.launchdarkly.com/api/v2/projects/{projectKey}/ai-configs/{configKey}/targeting" \
-H "Authorization: {api_token}" \
-H "Content-Type: application/json; domain-model=launchdarkly.semanticpatch" \
-H "LD-API-Version: beta" \
-d '{
"environmentKey": "production",
"instructions": [{
"kind": "addRule",
"clauses": [{
"contextKind": "user",
"attribute": "selectedModel",
"op": "contains",
"values": ["sonnet"],
"negate": false
}],
"variation": 0
}]
}'curl -X PATCH "..." \
-d '{
"environmentKey": "production",
"instructions": [{
"kind": "addRule",
"clauses": [{
"contextKind": "user",
"attribute": "tier",
"op": "in",
"values": ["premium"],
"negate": false
}],
"percentageRolloutConfig": {
"contextKind": "user",
"bucketBy": "key",
"variations": [
{"variation": 0, "weight": 60000},
{"variation": 1, "weight": 40000}
]
}
}]
}'curl -X PATCH "..." \
-d '{
"environmentKey": "production",
"instructions": [{
"kind": "updateFallthroughVariationOrRollout",
"variationId": "fallback-variation-uuid"
}]
}'import requests
import os
from typing import Dict, List, Optional
class AIConfigTargeting:
"""Manager for config targeting rules"""
def __init__(self, api_token: str, project_key: str):
self.api_token = api_token
self.project_key = project_key
self.base_url = "https://app.launchdarkly.com/api/v2"
def get_targeting(self, config_key: str) -> Optional[Dict]:
"""Get current targeting with variation IDs."""
url = f"{self.base_url}/projects/{self.project_key}/ai-configs/{config_key}/targeting"
response = requests.get(url, headers={
"Authorization": self.api_token,
"LD-API-Version": "beta"
})
if response.status_code == 200:
return response.json()
print(f"[ERROR] {response.status_code}: {response.text}")
return None
def get_variation_id(self, config_key: str, variation_key: str) -> Optional[str]:
"""Look up variation UUID from key or name."""
targeting = self.get_targeting(config_key)
if targeting:
for var in targeting.get("variations", []):
if var.get("key") == variation_key or var.get("name") == variation_key:
return var.get("_id")
return None
def update_targeting(self, config_key: str, environment: str,
instructions: List[Dict], comment: str = "") -> Optional[Dict]:
"""Send semantic patch instructions."""
url = f"{self.base_url}/projects/{self.project_key}/ai-configs/{config_key}/targeting"
payload = {"environmentKey": environment, "instructions": instructions}
if comment:
payload["comment"] = comment
response = requests.patch(url, headers={
"Authorization": self.api_token,
"Content-Type": "application/json; domain-model=launchdarkly.semanticpatch",
"LD-API-Version": "beta"
}, json=payload)
if response.status_code == 200:
return response.json()
print(f"[ERROR] {response.status_code}: {response.text}")
return None
def enable_config(self, config_key: str, environment: str,
variation_key: str = "default") -> bool:
"""
Enable a config by setting fallthrough to an enabled variation.
Note: turnTargetingOn doesn't work for configs. Instead, set the
fallthrough from the disabled variation (index 0) to an enabled one.
"""
variation_id = self.get_variation_id(config_key, variation_key)
if not variation_id:
print(f"[ERROR] Variation '{variation_key}' not found")
return False
return self.set_fallthrough(config_key, environment, variation_id)
def add_rule(self, config_key: str, environment: str,
clauses: List[Dict], variation: int,
description: str = "") -> bool:
"""Add targeting rule serving a specific variation index."""
instruction = {
"kind": "addRule",
"clauses": clauses,
"variation": variation
}
if description:
instruction["description"] = description
result = self.update_targeting(config_key, environment,
[instruction], f"Add rule: {description}")
if result:
print(f"[OK] Rule added")
return True
return False
def add_rollout_rule(self, config_key: str, environment: str,
clauses: List[Dict],
weights: List[Dict],
bucket_by: str = "key") -> bool:
"""
Add percentage rollout rule.
weights: [{"variation": 0, "weight": 50000}, {"variation": 1, "weight": 50000}]
"""
result = self.update_targeting(config_key, environment, [{
"kind": "addRule",
"clauses": clauses,
"percentageRolloutConfig": {
"contextKind": "user",
"bucketBy": bucket_by,
"variations": weights
}
}], "Add percentage rollout")
if result:
print(f"[OK] Rollout rule added")
return True
return False
def set_fallthrough(self, config_key: str, environment: str,
variation_id: str) -> bool:
"""Set default (fallthrough) variation by UUID."""
result = self.update_targeting(config_key, environment, [{
"kind": "updateFallthroughVariationOrRollout",
"variationId": variation_id
}], "Set fallthrough")
if result:
print(f"[OK] Fallthrough set")
return True
return False
def target_individuals(self, config_key: str, environment: str,
context_keys: List[str], variation: int,
context_kind: str = "user") -> bool:
"""Target specific context keys."""
result = self.update_targeting(config_key, environment, [{
"kind": "addTargets",
"variation": variation,
"contextKind": context_kind,
"values": context_keys
}], f"Target {len(context_keys)} individuals")
if result:
print(f"[OK] Individual targets added")
return True
return False
def target_segment(self, config_key: str, environment: str,
segment_keys: List[str], variation: int) -> bool:
"""Target a segment."""
result = self.update_targeting(config_key, environment, [{
"kind": "addRule",
"clauses": [{
"attribute": "segmentMatch",
"contextKind": "", # Leave blank for segments
"op": "segmentMatch",
"values": segment_keys,
"negate": False
}],
"variation": variation
}], f"Target segments: {segment_keys}")
if result:
print(f"[OK] Segment targeting added")
return True
return False
def clear_rules(self, config_key: str, environment: str) -> bool:
"""Remove all targeting rules."""
result = self.update_targeting(config_key, environment,
[{"kind": "replaceRules", "rules": []}], "Clear all rules")
if result:
print(f"[OK] All rules cleared")
return True
return False{
"contextKind": "user",
"attribute": "email",
"op": "endsWith",
"values": [".edu"],
"negate": false
}{
"percentageRolloutConfig": {
"contextKind": "user",
"bucketBy": "key",
"variations": [
{"variation": 0, "weight": 50000},
{"variation": 1, "weight": 50000}
]
}
}{
"progressiveRolloutConfig": {
"contextKind": "user",
"controlVariation": 1,
"endVariation": 0,
"steps": [
{"rolloutWeight": 1000, "duration": {"quantity": 4, "unit": "hour"}},
{"rolloutWeight": 5000, "duration": {"quantity": 4, "unit": "hour"}},
{"rolloutWeight": 10000, "duration": {"quantity": 4, "unit": "hour"}}
]
}
}{
"guardedRolloutConfig": {
"randomizationUnit": "user",
"stages": [
{"rolloutWeight": 1000, "monitoringWindowMilliseconds": 17280000},
{"rolloutWeight": 5000, "monitoringWindowMilliseconds": 17280000}
],
"metrics": [{
"metricKey": "error-rate",
"onRegression": {"rollback": true},
"regressionThreshold": 0.01
}]
}
}# Route based on selectedModel context attribute
targeting.add_rule(
config_key="model-selector",
environment="production",
clauses=[{
"contextKind": "user",
"attribute": "selectedModel",
"op": "contains",
"values": ["sonnet"],
"negate": False
}],
variation=0, # Sonnet variation index
description="Route sonnet requests"
)targeting.add_rule(
config_key="chat-assistant",
environment="production",
clauses=[{
"contextKind": "user",
"attribute": "tier",
"op": "in",
"values": ["premium", "enterprise"],
"negate": False
}],
variation=0 # Premium model variation
)targeting.target_segment(
config_key="chat-assistant",
environment="production",
segment_keys=["beta-testers"],
variation=1 # Experimental variation
)