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 terva-sh/terva --skill write-terva-themesgit clone --depth 1 https://github.com/terva-sh/tervaWrote 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/terva-sh/terva/write-terva-themes)<a href="https://agentmods.dev/skills/terva-sh/terva/write-terva-themes"><img src="https://agentmods.dev/badge/skills/terva-sh/terva/write-terva-themes/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/terva-sh/terva/write-terva-themes"><img src="https://agentmods.dev/badge/skills/terva-sh/terva/write-terva-themes.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 | $0.00025 | $0.02278 |
| Opus 5 | $0.00013 | $0.01139 |
| Sonnet 5 | $0.00005 | $0.00456 |
| Haiku 4.5 | $0.00003 | $0.00228 |
Grade A, and why
write-terva-themes 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 9d 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.
This is a copy
88% identical to write-zot-themes — 58 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 341 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Writing terva themes
Use this skill when the user asks for help creating, editing, installing, debugging, or packaging a terva color theme. Read this skill before generating a theme file or advising on theme extension layout.
What a terva theme is
A terva theme is a JSON file that overrides any subset of terva's built-in light/dark theme values. Theme files are intentionally permissive: nothing is required. A file may contain only colors, only spinner settings, only syntax colors, or only metadata. Missing values always inherit from the built-in detected light/dark default.
User themes are discovered from:
$TERVA_HOME/themes/*.json
Extension themes are discovered in-place from loaded extension dirs:
$TERVA_HOME/extensions/<extension>/theme.json
$TERVA_HOME/extensions/<extension>/themes/theme.json
<project>/.terva/extensions/<extension>/theme.json
<project>/.terva/extensions/<extension>/themes/theme.json
terva does not copy extension themes into $TERVA_HOME/themes; extension
owned themes stay in the extension directory. The settings picker stores
an absolute path for extension-owned themes and loads that file directly.
Minimal examples
Empty / metadata-only theme
Valid; inherits all colors/spinner/syntax from terva defaults.
{
"name": "my-theme",
"description": "Metadata only; all visuals inherit terva defaults."
}
Change one color for both light and dark
{
"name": "pink-accent",
"colors": {
"accent": 204
}
}
Change one color per mode
{
"name": "split-accent",
"colors": {
"dark": { "accent": 204 },
"light": { "accent": 161 }
}
}
Spinner-only theme
Top-level spinner overrides are valid and apply to both modes.
{
"name": "custom-spinner",
"description": "Only changes the busy spinner.",
"spinner_frames": ["◢", "◣", "◤", "◥"],
"spinner_messages": ["working"],
"spinner_interval_ms": 120
}
Dark-only theme also works in light terminals
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.
- 9d ago First seen · 341 lines · 25 tokens per session scan A f117dc5a7f1d
write-terva-themes is a skill published in the GitHub repository terva-sh/terva (2 stars, last pushed today), licensed MIT. It adds 25 tokens to every session and 2,278 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to write-zot-themes, differing in 58 lines, and is treated as a copy.
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