Borrowing it
Nothing to install: this file belongs to phase-rs/phase. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/phase-rs/phase/main/.claude/skills/add-keyword/SKILL.mdgit clone --depth 1 https://github.com/phase-rs/phaseWrote 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/phase-rs/phase/add-keyword)<a href="https://agentmods.dev/skills/phase-rs/phase/add-keyword"><img src="https://agentmods.dev/badge/skills/phase-rs/phase/add-keyword/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/phase-rs/phase/add-keyword"><img src="https://agentmods.dev/badge/skills/phase-rs/phase/add-keyword.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Rogue Agent · line 259 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
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 | $0.00054 | $0.04413 |
| Opus 5.5 | $0.00022 | $0.01765 |
| Sonnet 5.5 | $0.00011 | $0.00883 |
| Haiku 4.5 | $0.00005 | $0.00441 |
Grade A, and why
add-keyword 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 2mo 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 — 261 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Adding a Keyword Ability
Keywords are strongly-typed abilities stored on GameObjects and evaluated across combat, targeting, damage, state-based actions, and triggers. They flow through the layer system (granted/removed via ContinuousModification) and are parsed from both MTGJSON keyword arrays and Oracle text.
Before you start: Trace how Ward works end-to-end — it's a parameterized keyword with targeting interaction: Keyword::Ward(ManaCost) in keywords.rs → FromStr parsing → targeting.rs check → layer grant via AddKeyword.
CR Verification Rule: Every CR number in annotations MUST be verified by grepping
docs/MagicCompRules.txtbefore writing. Do NOT rely on memory — 702.x keyword ability numbers are arbitrary sequential assignments that LLMs consistently hallucinate (e.g., Crew is 702.122, not 702.148). Rungrep -n "^702.122" docs/MagicCompRules.txtfor every number. If you cannot find it, do not write the annotation.
MTG Rules Reference
| Rule | What it governs | Engine implication |
|---|---|---|
| 702.x | Individual keyword definitions | Each keyword has specific rules for where it matters |
| 613.1f | Keywords granted/removed in Layer 6 | ContinuousModification::AddKeyword / RemoveKeyword |
| 702.2 | Evergreen keywords (flying, haste, etc.) | Unit variants on Keyword enum |
| 702.16 | Protection | Keyword::Protection(ProtectionTarget) with multi-check in protection_prevents_from() |
| 702.21 | Ward | Keyword::Ward(ManaCost) checked in targeting.rs |
Key Types
Keyword Enum — crates/engine/src/types/keywords.rs
Three categories of variants:
| Category | Examples | Data |
|---|---|---|
| Unit (simple) | Flying, Haste, Trample, Deathtouch, Lifelink, Vigilance, Reach, Defender, Menace, Indestructible, Hexproof, Shroud, Flash |
None |
| Parameterized (u32) | Dredge(u32), Modular(u32), Renown(u32), Fabricate(u32), Annihilator(u32), Crew(u32) |
Numeric value |
| Parameterized (ManaCost) | Ward(ManaCost), Kicker(ManaCost), Cycling(ManaCost), Flashback(ManaCost), Equip(ManaCost), Morph(ManaCost) |
Mana cost |
| Special | Protection(ProtectionTarget), Enchant(TargetFilter), Landwalk(String), EtbCounter { counter_type, count } |
Typed data |
| Fallback | Unknown(String) |
Unparsed name — never matches at runtime, tracked in coverage |
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.
- 2mo ago First seen · 261 lines · 54 tokens per session scan A 70d0647cd131
add-keyword is a skill published in the GitHub repository phase-rs/phase (312 stars, last pushed today), licensed Apache-2.0. It adds 54 tokens to every session and 4,413 once invoked, about $0.0002 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 2026-08-30.
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