Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add harness/harness-skills --skill create-feature-flaggit clone --depth 1 https://github.com/harness/harness-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/harness/harness-skills/create-feature-flag)<a href="https://agentmods.dev/skills/harness/harness-skills/create-feature-flag"><img src="https://agentmods.dev/badge/skills/harness/harness-skills/create-feature-flag/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/harness/harness-skills/create-feature-flag"><img src="https://agentmods.dev/badge/skills/harness/harness-skills/create-feature-flag.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00199 | $0.02039 |
| Opus 5.5 | $0.00080 | $0.00816 |
| Sonnet 5.5 | $0.00040 | $0.00408 |
| Haiku 4.5 | $0.00020 | $0.00204 |
Grade A, and why
create-feature-flag scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create Feature Flag
Create a new Harness FME feature flag and optionally its per-environment definitions with safe defaults, following the project's existing conventions. Related: update-flag-targeting (ramp), manage-experiments (A/B test).
Tools
Works through the Harness MCP server or the Harness CLI; names are from tool-map.md.
| Operation | MCP | CLI |
|---|---|---|
| List flags | harness_list · fme_feature_flag · size: 50 · compact: false |
harness list feature_flag --json --limit 50 |
| Get flag | harness_get · fme_feature_flag · params.feature_flag_name |
harness get feature_flag <name> --json |
| List environments | harness_list · fme_environment · compact: false |
harness list fme_environment --json |
| List traffic types | harness_list · fme_traffic_type · compact: false |
harness list traffic_type --json |
| Get definition | harness_get · fme_feature_flag_definition · params: { feature_flag_name, environment_id } |
harness get feature_flag:definition <flag> --env <env-id> --json |
| Create flag | harness_create · fme_feature_flag · body: { name, trafficType, description?, tags?, owners? } |
harness create feature_flag <name> --traffic-type <type> --set description="..." plus --add tags.<name> per tag, or -f flag.json with the full approved body (CLI's tags/owners are collection fields — --set tags=[...] isn't valid syntax) |
| Create definition | harness_create · fme_feature_flag_definition · params: { feature_flag_name, environment_id } · body: { treatments, defaultTreatment, defaultRule, comment? } |
harness create feature_flag:definition <flag> --env <env-id> -f def.json |
Instructions
Phase 1: Scope
Follow scope-establishment.md. Restate: Working in org=..., project=....
Phase 2: Explore conventions
List flags (≤50) to infer naming pattern (kebab-case, prefixes), common tags, and usual traffic type. List traffic types. List environments and note isProduction. Optionally get definition from 1–2 similar flags to learn treatment names. Summarize conventions in 3 bullets.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday Changed · +1 lines a156cb1b36bc
- 9d ago First seen · 120 lines · 199 tokens per session scan A 231e20534f2e
create-feature-flag is a skill published in the GitHub repository harness/harness-skills (117 stars, last pushed yesterday), licensed Apache-2.0. It adds 199 tokens to every session and 2,039 once invoked, about $0.0008 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-07.
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