launchdarkly-flag-discovery

LaunchDarkly Flag Discovery

You're using a skill that will guide you through auditing and understanding the feature flag landscape in a LaunchDarkly project. Your job is to explore the project, assess the health of its flags, identify what needs attention, and provide actionable recommendations.

Prerequisites

This skill requires the remotely hosted LaunchDarkly MCP server to be configured in your environment.

Required MCP tools:

• list-flags: search and browse flags with filtering by state, type, tags
• get-flag: get full configuration for a single flag in a specific environment
• get-flag-status-across-envs: check a flag's lifecycle status across all environments

Optional MCP tools (enhance depth):

• find-stale-flags: find flags that are candidates for cleanup, sorted by staleness
• get-flag-health: get combined health view for a single flag (merges status + config)
• check-removal-readiness: detailed safety check for a specific flag

Workflow

Step 1: Understand the Project

Before diving into flag data, establish context:

1. Identify the project. Confirm the projectKey with the user. If they haven't specified one, ask.
2. Understand scope. Ask the user what they're trying to accomplish:

• Broad audit? ("What's the state of our flags?")
• Targeted investigation? ("Is this specific flag still needed?")
• Cleanup planning? ("What flags can we remove?")

Step 2: Explore the Flag Landscape

Adapt your approach to the user's goal:

For a broad audit:

• Use list-flags scoped to a critical environment (default to production).
• Note the total count: this tells you the scale of the flag surface area.
• Filter by state (active, inactive, launched, new) to segment the landscape.
• Filter by type (temporary vs permanent): temporary flags are the primary cleanup targets.

For cleanup planning:

• Use find-stale-flags: this is the most efficient entry point. It returns a prioritized list of cleanup candidates sorted by staleness, categorized as:
• never_requested: created but never evaluated (possibly abandoned)
• inactive_30d: no SDK evaluations in the specified period
• launched_no_changes: fully rolled out, no recent changes
• Default inactiveDays is 30. Increase for conservative cleanup (60, 90) or decrease for aggressive cleanup (7, 14).
• Default includeOnly is temporary. Set to all to include permanent flags.

For a targeted investigation:

• Use get-flag-health for a single-flag deep dive. It merges status data with configuration context in one call, returning lifecycle state, last-requested timestamp, targeting summary, age, and whether it's temporary.
• Or use get-flag for the full configuration including rules, targets, and fallthrough details.

Step 3: Assess Flag Health

For flags that need deeper investigation, assess health signals. See Flag Health Signals for the full interpretation guide.

Key signals to evaluate:

Use get-flag-status-across-envs to check if a flag is consistent across environments. A flag inactive in production but active in staging tells a different story than one inactive everywhere.

Step 4: Categorize and Prioritize

Group flags into actionable categories:

1. Ready to remove: Inactive everywhere, temporary, no dependencies. Direct the user to the flag cleanup skill for code removal.
2. Likely safe, needs verification: Launched (fully rolled out), no rule changes recently. The user should confirm the rollout is intentionally complete.
3. Needs investigation: Active in some environments but not others, or has complex targeting. Don't recommend action without more context.
4. Leave alone: Active flags doing their job, or permanent flags that are intentionally long-lived.

Step 5: Assess Removal Readiness (When Applicable)

If the user wants to know whether a specific flag can be removed, use check-removal-readiness. This tool orchestrates multiple API calls in parallel and returns a structured verdict:

• safe: No blockers or warnings. Proceed with cleanup.
• caution: Warnings exist (code references, expiring targets, permanent flag type). Present and let the user decide.
• blocked: Hard blockers (dependent flags, active requests, targeting rules). Must resolve first.

See Removal Readiness Checklist for the full details on interpreting each signal.

Step 6: Present Findings

Structure your response based on what the user asked for:

For audits: Lead with a summary (total flags, breakdown by state and type), then highlight what needs attention, then provide specific recommendations.

For specific flags: Lead with the verdict (healthy / needs attention / ready to remove), then support it with the signals you found.

For cleanup planning: Lead with the count of cleanup candidates, prioritize by confidence (safest removals first), and link to the cleanup workflow for execution.

Important Context

• "Launched" means fully rolled out: targeting is on, a single variation is served to everyone, and no changes have been made recently. It doesn't mean "recently deployed."
• "Inactive" doesn't always mean safe to remove. The flag might be used in code that hasn't shipped yet, or referenced as a prerequisite by another flag.
• Permanent flags can be inactive on purpose. Some flags are designed to be dormant until needed (kill switches, emergency toggles). Don't automatically flag these for cleanup.
• Weights are scaled by 1000 in the API. A weight of 60000 means 60%. Always convert to human-readable percentages.
• This skill is for discovery, not action. If the user wants to remove a flag from code, direct them to the flag cleanup skill. If they want to change targeting, direct them to the flag targeting skill.

References

• Flag Health Signals: How to interpret lifecycle states, staleness, and health data
• Removal Readiness Checklist: Full safety assessment before recommending flag removal