Borrowing it
Nothing to install: this file belongs to saajunaid/caddis-plugin. 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/saajunaid/caddis-plugin/main/.github/instructions/data-contracts.instructions.mdgit clone --depth 1 https://github.com/saajunaid/caddis-pluginWrote 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/instructions/saajunaid/caddis-plugin/data-contracts)<a href="https://agentmods.dev/instructions/saajunaid/caddis-plugin/data-contracts"><img src="https://agentmods.dev/badge/instructions/saajunaid/caddis-plugin/data-contracts/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/instructions/saajunaid/caddis-plugin/data-contracts"><img src="https://agentmods.dev/badge/instructions/saajunaid/caddis-plugin/data-contracts.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 | $0.01522 | $0.01522 |
| Opus 5.5 | $0.00609 | $0.00609 |
| Sonnet 5.5 | $0.00304 | $0.00304 |
| Haiku 4.5 | $0.00152 | $0.00152 |
Grade A, and why
caddis-plugin data-contracts.instructions.md 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 1mo 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 — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Data Contract Conventions
Rules for building and maintaining typed data pipelines from source payload to frontend display.
Layer Architecture
Every data pipeline has up to 6 layers. Not all are required for every project.
Source → Adapter → Ingestion Model → Normalizer → Display DTO → API Router → Frontend Types/Services
| Layer | Location | Responsibility |
|---|---|---|
| Source Adapter | src/services/adapters/ or src/services/ |
Fetches raw data from external source (API, file, DB) |
| Ingestion Model | src/models/ingestion/ |
1:1 Pydantic model matching raw source payload shape |
| Normalizer | src/services/normalizers/ |
Transforms ingestion model → display DTO (business logic lives here) |
| Display DTO | src/models/responses/ |
Frozen Pydantic model defining the API boundary contract |
| API Router | src/api/routers/ |
FastAPI endpoint returning typed response_model |
| Frontend Types | frontend/src/types/ |
TypeScript interfaces mirroring display DTO |
| Frontend Service | frontend/src/services/ |
Typed axios/fetch functions consuming API endpoints |
Display DTO Rules
Field Aliasing
When JSON source uses camelCase but Python uses snake_case, use Field(alias=...):
from pydantic import BaseModel, Field
class CustomerScore(BaseModel):
customer_id: str = Field(alias="customerId")
net_promoter_score: float = Field(alias="netPromoterScore")
model_config = ConfigDict(populate_by_name=True)
No Silent Data Dropping
# ❌ CRITICAL: Silently drops unknown fields — data loss bug
class SurveyData(BaseModel):
model_config = ConfigDict(extra="ignore")
# ✅ GOOD: Explicit about every field; unknown fields cause validation error
class SurveyData(BaseModel):
model_config = ConfigDict(extra="forbid")
# ✅ ALSO GOOD: Allow extras during migration, but log them
class SurveyData(BaseModel):
model_config = ConfigDict(extra="allow")
Rule: Display DTOs at the API boundary must never use extra="ignore". Use extra="forbid" (strict) or extra="allow" (migration period) with logging.
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.
- 1mo ago First seen · 196 lines · 1,522 tokens per session scan A a5c6d69444c7
caddis-plugin data-contracts.instructions.md is an instructions file published in the GitHub repository saajunaid/caddis-plugin (0 stars, last pushed today), licensed MIT. It adds 1,522 tokens to every session, about $0.0061 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 2026-08-31.
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