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 Cratis/AI --skill cratis-screenplay-projectionsgit clone --depth 1 https://github.com/Cratis/AIWrote 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/cratis/ai/cratis-screenplay-projections)<a href="https://agentmods.dev/skills/cratis/ai/cratis-screenplay-projections"><img src="https://agentmods.dev/badge/skills/cratis/ai/cratis-screenplay-projections/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/cratis/ai/cratis-screenplay-projections"><img src="https://agentmods.dev/badge/skills/cratis/ai/cratis-screenplay-projections.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 | $0.00110 | $0.03996 |
| Opus 5.5 | $0.00044 | $0.01598 |
| Sonnet 5.5 | $0.00022 | $0.00799 |
| Haiku 4.5 | $0.00011 | $0.00400 |
Grade A, and why
cratis-screenplay-projections 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 3d 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 — 319 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Projections — the Screenplay PDL
Read preferred syntax when writing or reviewing .play.
A projection folds events into a read model. Its body is the Projection
Declaration Language, an embedded sub-grammar with its own parser — not free
text. This is half of every event model, and the half most easily got wrong.
Locate the model
Look first for the project's existing .play files: the folder holding them is the
model. A new model goes under the repository's Source/ or src/ folder, else in a
Screenplay/ folder at the repository root; never under .cratis/, which holds
configuration and the shared AI corpus only. This is the
conventional home for consumer-owned .play source; do not invent another
location or search the whole repository before checking it.
cratis ai install manages .cratis/ai/, never model files. Never
hand-copy Screenplay source between repositories. Keep Markdown that explains,
questions or navigates the model in the repository's documentation; the .play
source is the single flow model.
Product sources
Consult Screenplay Documentation/screenplay/projections/ for grammar and semantics,
readmodels.md for targets and diagnostics.md for errors. Verify examples with
the standalone compiler before claiming another version behaves the same.
Chronicle decides what a projection means. Screenplay owns the grammar; which instance an event affects, what a join may create and what a removal removes follow Chronicle's lowering. Syntax that compiles can still mean something other than it seems: read the warnings.
The shape
Excerpt: the concepts and the three events (each carrying invoiceId) are
declared elsewhere in the model.
readmodel InvoiceDetailsReadModel
invoiceId InvoiceId
invoiceNumber InvoiceNumber
status InvoiceStatus
lastUpdatedAt DateTime
projection InvoiceDetails => InvoiceDetailsReadModel
every
lastUpdatedAt = $eventContext.occurred
exclude children
from InvoiceRegistered key invoiceId
status = "draft"
from InvoiceSent key invoiceId
status = "sent"
remove with InvoiceCancelled key invoiceId
What ships with it
6 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.
- 3d ago Changed · +7 lines 94ca93662e9b
- 5d ago Changed · +7 lines 570b7d6efd95
- 7d ago Changed · -75 lines ace2b3586cfe
- 9d ago Changed · +2 lines 09846aeb1ffd
- 10d ago Changed · +15 lines b5a159ef7e22
- 11d ago Changed 292a1378008d
- 12d ago Changed · -1 lines ea4401fef69f
- 15d ago Changed · +14 lines 871cfc416b05
- 17d ago Changed · +11 lines 0b2f15f5d763
- 26d ago First seen · 339 lines · 110 tokens per session scan A 83b8ebf97d27
cratis-screenplay-projections is a skill published in the GitHub repository Cratis/AI (4 stars, last pushed yesterday), licensed MIT. It adds 110 tokens to every session and 3,996 once invoked, about $0.0004 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 2026-09-19.
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