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 nearform/lastlight --skill lastlight-overlaygit clone --depth 1 https://github.com/nearform/lastlightWrote 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/nearform/lastlight/lastlight-overlay)<a href="https://agentmods.dev/skills/nearform/lastlight/lastlight-overlay"><img src="https://agentmods.dev/badge/skills/nearform/lastlight/lastlight-overlay.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00115 | $0.01419 |
| Opus 5 | $0.00057 | $0.00709 |
| Sonnet 5 | $0.00023 | $0.00284 |
| Haiku 4.5 | $0.00012 | $0.00142 |
Grade A, and why
lastlight-overlay 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create & customize a Last Light overlay
Last Light keeps per-deployment customization in a private overlay at
instance/, layered over the packaged defaults at startup. The overlay can hold
config.yaml, secrets/, and overrides of any asset — workflows/,
workflows/prompts/, skills/, agent-context/. An overlay copy shadows the
built-in by logical name, so you only fork what you want to change.
These are host-local file operations on the working directory (resolved from
--home → LASTLIGHT_HOME → saved serverHome → ~/lastlight).
1. Scaffold or adopt the overlay
lastlight server setup
This scaffolds/adopts the working directory: clones the core repo if needed, then
creates a fresh overlay (scaffold + optional private gh repo create) or
clones an existing overlay repo — your choice at the prompt. It also symlinks
instance/docker-compose.override.yml and saves the working dir for later
lastlight server … commands.
Read references/overlay-layout.md for the full directory shape and how the
layering/merge rules work (arrays replace, maps deep-merge, overlay wins by
name).
2. Tune non-secret config
Edit instance/config.yaml to set managedRepos, and optionally override
models, variants, routes, approvals, disabled.*. Secrets stay in
instance/secrets/.env (never in config.yaml).
Model setup
Two halves — the credential (env) and the model choice (config):
-
Provider API key →
instance/secrets/.env. Set the key matching the provider you'll use, e.g.ANTHROPIC_API_KEY=…(orOPENAI_API_KEY,OPENROUTER_API_KEY, … — see the repo'ssrc/providers.tsfor the full registry). Keys are env-only, never inconfig.yaml. -
Model choice →
config.yamlmodels:map.defaultis the model every agent phase uses unless overridden; add per-task keys to override individual phases or the cheap helpers:models: default: anthropic/claude-sonnet-4-6 # every phase, provider/model form architect: anthropic/claude-opus-4-8 # a specific phase classifier: anthropic/claude-haiku-4-5-20251001 # the intent-routing helper screener: anthropic/claude-haiku-4-5-20251001 # the prompt-injection screener
What ships with it
2 files 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.
- 8d ago First seen · 115 lines · 115 tokens per session scan A 753e8bbe4a94
lastlight-overlay is a skill published in the GitHub repository nearform/lastlight (22 stars, last pushed 4d ago), licensed MIT. It adds 115 tokens to every session and 1,419 once invoked, about $0.0006 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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