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Runtime Feature Flags · kdlbs | DecimalAI

codingby kdlbs

Runtime Feature Flags

kdlbs/runtime-feature-flags

Source kdlbs/kandev ↗License AGPL-3.0

Add, roll out, promote, graduate, or remove Kandev runtime feature flags and release toggles across the backend and frontend.

SkillScore83Maintained

Automatic

Coding pack

Last verified 8/19/2026

What it changes

Passed 16 of 19 test cases with the skill, and 6 of 19 without it.

Without skill30%

With skill83%

Checks it passed that the model alone missed

keeps registry.go metadata-only
uses the useFeature hook for client surfaces
runs make -C apps/backend lint from repository root

and 14 more in the full report

12 fixed7 passed either way4 still failing0 broke

Pass-rate lift: +52 pp
Tokens: +18%
Agent turns: 0%
Response time: -51%

Model Measured 8/19/2026v2 · latest is v319 of 23 cases passed with skill · 19 comparable

Tokens, turns and time describe resource use, not a dollar price.

This benchmark measured an earlier version of the skill.

A newer attempt on gemini-3.8-flash on 10/20/2026 did not produce a publishable comparison (not comparable). The snapshot above is the previously measured run.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/kdlbs-runtime-feature-flags/SKILL.md https://app.decimal.ai/s/kdlbs-runtime-feature-flags/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add kdlbs-runtime-feature-flags, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/kdlbs-runtime-feature-flags/ and pins it in .decimal/skills.lock

decimalai skills add kdlbs-runtime-feature-flags

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/kdlbs-runtime-feature-flags/SKILL.md https://app.decimal.ai/s/kdlbs-runtime-feature-flags/SKILL.md

Raw file: /s/kdlbs-runtime-feature-flags/SKILL.md ↗ · machine-readable summary at /s/kdlbs-runtime-feature-flags.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 12

Prompt

What exact `go test` command should be executed from `apps/backend` to verify the backend runtime flags, common config, and profiles packages after changing a flag?

What was checked, without and with the skill
Checked	Without skill	With skill
runs go test ./internal/runtimeflags ./internal/common/config ./internal/profiles from apps/backend	Missed	Passed

case-18 · gemini-3.6-flash · 8/19/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md108 linessingle file

Runtime Feature Flags

Use this checklist for temporary release toggles and risky features. It is self-contained: do not depend on the agent having read an ADR or public docs. Read apps/backend/AGENTS.md and apps/web/AGENTS.md when the change touches those subtrees.

Invariants

The backend is authoritative. A disabled feature must not be reachable through HTTP, WebSocket, MCP, agent-tool, or background-job entry points.
A new release toggle is off in every shipped profile when it is merged. The disabled path preserves the existing behavior and fails closed before deriving data, writing state, dispatching work, or exposing a capability.
Effective values are ordered: explicit environment variable, SQLite override, then profile default. An explicit environment variable locks the admin UI.
Use one identity across layers: features.<camelCaseKey>, KANDEV_FEATURES_<UPPER_SNAKE_CASE>, a Go FeaturesConfig field, its JSON tag, and the matching frontend key. Never add a parallel flag map or switch.
Never reuse an identity recorded in the repository's append-only retired registry. Before relying on retirement, verify that retiredRuntimeFlagIdentities and its collision/completeness test exist; if they do not, add that runtimeflags infrastructure before removing a live flag.

Add a flag

Update these layers in the same change:

Profile default: add KANDEV_FEATURES_<NAME> under features: in the root profiles.yaml; use prod: "false", dev: "false", and e2e: "false" for a release toggle unless the task explicitly documents a test-only exception.
Backend config: add a bool field with explicit mapstructure and json tags to apps/backend/internal/common/config/config.go.
Registry/config binding: add exactly one metadata registration to apps/backend/internal/runtimeflags/registry.go: key, env var, kind, label, description, stability, risk, and restart/mutability metadata. The registry definition is metadata-only; add the key/env constants and update OptionsFromConfig, ValuesFromConfig, and ApplyStatesToConfig in runtimeflags/config.go for typed config wiring.

Track record

Benchmark

16 / 19

test cases passed, vs 6 / 19 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v6 — 10/17/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

kdlbs / kandev

.agents/skills/runtime-feature-flags/SKILL.md

View on GitHub ↗

License AGPL-3.0Imported 10/17/2026Version v3

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Runtime Feature Flags

Invariants

Add a flag

Track record

Benchmark

Adoption

SkillSafety

Source

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