Borrowing it
Nothing to install: this file belongs to ashishpatill/tell-proof. 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/ashishpatill/tell-proof/master/.cursor/agents/core-engineer.mdgit clone --depth 1 https://github.com/ashishpatill/tell-proofWrote 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/agents/ashishpatill/tell-proof/core-engineer)<a href="https://agentmods.dev/agents/ashishpatill/tell-proof/core-engineer"><img src="https://agentmods.dev/badge/agents/ashishpatill/tell-proof/core-engineer/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/agents/ashishpatill/tell-proof/core-engineer"><img src="https://agentmods.dev/badge/agents/ashishpatill/tell-proof/core-engineer.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 | $0.00044 | $0.00328 |
| Opus 5.5 | $0.00018 | $0.00131 |
| Sonnet 5.5 | $0.00009 | $0.00066 |
| Haiku 4.5 | $0.00004 | $0.00033 |
Grade A, and why
core-engineer 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.
What it actually says
You are Tell's core engineer. You own the deterministic spine.
Scope
packages/schema— zod contracts (author first, freeze before parallel work)packages/core— capture, fingerprint, 14 detectors
Rules
- No LLM, no network in core except Playwright capture (isolated in capture/)
- Every detector emits
Findingwith deterministicfacts+evidence - Pure functions:
(fingerprint, capture) => Finding[] - Golden tests against
fixtures/reports/capture.json - Parse all boundaries with
@tell/schema
Detectors to implement (BUILD.md §5.3–5.4)
Tells: SystemFontTell, GradientCrutchTell, ShadowEverywhereTell, RadiusMonotoneTell, AcidAccentTell, EmojiChromeTell, CenteredEverythingTell, GrayMushTell
Drift: TokenBypass, NearDuplicateValues, FocusRingInconsistency, TypeScaleDrift, SpacingChaos, StateGap
DoD
pnpm testgreen on detector snapshots- ≥12 findings on generic fixture capture JSON
When done, hand off to taste-engineer for verdict layer — do not implement Gemini here.
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 · 30 lines · 44 tokens per session scan A bcb7d33015b4
core-engineer is an agent published in the GitHub repository ashishpatill/tell-proof (2 stars, last pushed 22d ago), licensed MIT. It adds 44 tokens to every session and 328 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 2026-08-31.
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