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 instrument-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/instrument-feature-flag)<a href="https://agentmods.dev/skills/harness/harness-skills/instrument-feature-flag"><img src="https://agentmods.dev/badge/skills/harness/harness-skills/instrument-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/instrument-feature-flag"><img src="https://agentmods.dev/badge/skills/harness/harness-skills/instrument-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 | $0.00197 | $0.03148 |
| Opus 5.5 | $0.00079 | $0.01259 |
| Sonnet 5.5 | $0.00039 | $0.00630 |
| Haiku 4.5 | $0.00020 | $0.00315 |
Grade A, and why
instrument-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.
Instrument Feature Flag
Skill identifier: instrument-feature-flag. Gate application code behind an existing FME flag: inspect the real app first, prefer or design a small customer-extensible wrapper, get it approved, implement the minimal edits, and test at the wrapper and call-site boundary. Related: /create-feature-flag (new flag), /update-flag-targeting (missing/insufficient targeting), /feature-flag-onboarding (first-time setup, which delegates here for code).
Tools
Works through the Harness MCP server or the Harness CLI; names are from tool-map.md. This skill only reads Harness flag state for the selected environment — flag/definition writes are delegated to /create-feature-flag and /update-flag-targeting.
| 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 |
Instructions
Phase 1: Scope
Follow scope-establishment.md. Carry confirmed account/org/project, transport and application target from the request/caller; ask only for missing context before API calls. Keep Harness scope separate from the application repo/runtime — never derive one from the other. See mcp-setup.md for a supported CLI or MCP choice. List environments and require one explicitly confirmed environment before any flag/definition handoff. Resolve its ID and isProduction; if none is selected or the choice is ambiguous, ask and STOP—never inherit an all-environments default. This selection does not authorize a write.
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 f7497d5b1eb2
- 9d ago First seen · 120 lines · 197 tokens per session scan A 1b9429210ed8
instrument-feature-flag is a skill published in the GitHub repository harness/harness-skills (117 stars, last pushed yesterday), licensed Apache-2.0. It adds 197 tokens to every session and 3,148 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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