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 agentmods add skills/ambient-code/platform/developmentnpx skills add ambient-code/platform --skill developmentgit clone --depth 1 https://github.com/ambient-code/platformWhat 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 | $0.00067 | $0.00469 |
| Opus 5 | $0.00034 | $0.00234 |
| Sonnet 5 | $0.00013 | $0.00094 |
| Haiku 4.5 | $0.00007 | $0.00047 |
Grade A, and why
frontend-development 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 2d ago.
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.
What it actually says
Frontend Development
Before writing or changing any frontend code, load the project's frontend standards. These are non-negotiable constraints — not suggestions.
User Input
$ARGUMENTS
Required Reading
Read all files in specs/standards/frontend/ before proceeding:
ls specs/standards/frontend/
At minimum, this includes:
specs/standards/frontend/conventions.spec.md— zero-tolerance rules (noany, Shadcn only, React Query for all data,typeoverinterface, colocated components, feature flags)specs/standards/frontend/react-query.spec.md— file structure (ports/adapters/queries), data fetching patterns, testing requirements, validation checklist
Also read the API adapter spec if working on the services layer:
specs/frontend/api-adapter.spec.md— port interface contract, canonical types, 30 API domains, testability requirements
Key Constraints
These apply to every frontend change, no exceptions:
- Zero
anytypes. Use proper types orunknown. - Shadcn UI components only. No custom buttons, inputs, dialogs.
- React Query for all data fetching. No manual
fetch()in components. typeoverinterface. Always.- All adapters must be tested. No adapter merged without unit tests using recorded responses.
- All hooks must be tested. Hook tests use mock adapters, not real backends.
- Port interfaces, not raw API calls. React Query hooks consume ports, not
services/api/directly.
After Reading
Confirm you have loaded the standards, then proceed with the task. If any of your changes would violate these constraints, stop and discuss with the user before writing code.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2d ago First seen · 54 lines · 67 tokens per session scan A 99c523b7c0bd
frontend-development is a skill published in the GitHub repository ambient-code/platform (129 stars, last pushed 2d ago), licensed MIT. It adds 67 tokens to every session and 469 once invoked, about $0.0003 per session on Opus 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 2026-08-30.
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