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 plurigrid/asi --skill color-envelope-preservinggit clone --depth 1 https://github.com/plurigrid/asiWrote 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/plurigrid/asi/color-envelope-preserving)<a href="https://agentmods.dev/skills/plurigrid/asi/color-envelope-preserving"><img src="https://agentmods.dev/badge/skills/plurigrid/asi/color-envelope-preserving/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/plurigrid/asi/color-envelope-preserving"><img src="https://agentmods.dev/badge/skills/plurigrid/asi/color-envelope-preserving.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00015 | $0.02517 |
| Opus 5 | $0.00008 | $0.01259 |
| Sonnet 5 | $0.00003 | $0.00503 |
| Haiku 4.5 | $0.00002 | $0.00252 |
Grade A, and why
color-envelope-preserving 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.
How it starts
The opening of the file, as written. The whole thing — 290 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Color Envelope Preserving
Core Concept
Every navigation path carries a color envelope - a GF(3) ternary assignment that propagates through the path composition. This skill ensures that composed Navigators maintain color conservation (the envelope sums to 0 mod 3) across all compositions.
GF(3) Color Trits:
- -1 (Red/MINUS) - Conservative/filtering paths
- 0 (Green/ERGODIC) - Neutral/structural paths
- +1 (Blue/PLUS) - Generative/enriching paths
The envelope invariant: Any valid Navigator composition must have trits that sum to 0 (mod 3).
Why Color Envelopes?
Determinism Through Color
Every navigation operation is seeded with a color value. Same color seed → same traversal order → same results every time.
# With SplitMix64 seeding from color
nav = @late_nav([ALL, pred(iseven)])
↓ (color=-1)
deterministic traversal order
Conservation Law
When two Navigators compose:
nav1 = @late_nav([ALL, pred(f)]) # trit = -1
nav2 = @late_nav([keypath("x")]) # trit = 0
nav_composed = compose_navigators(nav1, nav2)
# Check: (-1) + 0 = -1 ≠ 0
# => INVALID! Cannot compose these Navigators.
A valid composition requires a third Navigator to balance:
nav3 = @late_nav([keypath("y")]) # trit = +1
# Check: (-1) + 0 + (+1) = 0 ✓
# => VALID! Complete GF(3) triad.
Architecture
Color Assignment Algorithm
Each Navigator's trit is determined by its semantic role:
| Path Type | Trit | Justification |
|---|---|---|
[ALL] |
-1 | Expands cardinality (conservative gate) |
[pred(f)] |
-1 | Filters/restricts domain |
[keypath(k)] |
0 | Neutral structural access |
[INDEX(i)] |
0 | Direct indexing (no change) |
[APPEND(x)] |
+1 | Adds value (generative) |
[TRANSFORM(f)] |
+1 | Enriches/generates new form |
| Composition of above | Sum of trits | Trits compose additively |
Color Propagation
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 · 290 lines · 15 tokens per session scan A 5c6bcb11f776
color-envelope-preserving is a skill published in the GitHub repository plurigrid/asi (62 stars, last pushed 2mo ago), licensed MIT. It adds 15 tokens to every session and 2,517 once invoked, about $0.0001 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 2026-09-01.
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