dblect: Instructions file for Claude Code

CLAUDE.md

dblect CLAUDE.md is an instructions file for Claude Code from dvryaboy/dblect. It costs 925 tokens per session, scanned A, original, Apache-2.0.

Coding guidelines for dblect that emphasize strict data types, reuse of existing helpers, and test-first development. TDD, or test-driven development, means writing a failing test that describes the desired behavior before implementing the code.

In plain words
What is it for?
Use them when designing types, reusing or generalizing helpers, defining contracts, writing property-based or exhaustive tests, and implementing changes after a failing test or formal specification.
Why use it?
They help catch incorrect behavior at the boundaries of the system and avoid tests tied to fragile implementation details. They also discourage duplicated code, excessive mocks, and tests that provide little protection.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is dvryaboy/dblect's own configuration. It tells Claude Code how to work on dblect itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything dblect configures →

Reuse

Borrowing it

Nothing to install: this file belongs to dvryaboy/dblect. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/dvryaboy/dblect/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/dvryaboy/dblect

Made for: Claude Code.

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Per session 925 This file is loaded in full into every session.
When invoked 925 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00925 $0.00925
Opus 5.5 $0.00370 $0.00370
Sonnet 5.5 $0.00185 $0.00185
Haiku 4.5 $0.00093 $0.00093

Measured 29d ago against content hash 9169eae1ac2a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

dblect CLAUDE.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 29d 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.

CLAUDE.md · 48 lines

How it starts

The opening of the file, as written. The whole thing — 48 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Style

We avoid stringy typing like the plague. We use rigorous types.

We reach for an existing helper before writing a parallel one, and generalize it when a second caller needs a variant. A comment or commit message that reaches for "mirroring", "duplicate of", or "acceptable for now" is a signal to stop and reuse the original instead.

Testing

We test rigorously. Whenever applicable, we design quality PBT tests, or otherwise leverage provers and exhaustive testing. We do not write tests for tests' sakes. We avoid test theater. We prefer to test at the boundaries instead of implementation specifics; tests should survive implementation changes that do not change contracts. Excessive use of mocking is a smell. Loads of boilerplate is a smell. Pin contracts, not coincidences. If fragile cooperation is observed (two functions work correctly together only because of implementation details, not contract guarantees), fix the contracts in code rather than pinning the accidental behavior in a test.

We work test-first: the failing test (or the property / lattice-law spec) comes before the implementation, so it pins the intended contract rather than rationalizing whatever the code happens to do. When the contract is amenable, we design the property-based test and its generators first, before the code, so the generator is not shaped to fit the implementation.

A whole suite passing on its first run is a smell rather than a win: it usually means the tests are weak or were written after the code. When it happens, we prove the tests bite by injecting deliberate contract violations and confirming a test fails for each.

We enumerate the input space rather than sampling it: a condition over a closed type earns a test per value, and the common ones (COUNT(*) among the duplicate-sensitive aggregates) belong in that space rather than being deferred as edge cases.

Soundness

We discharge each predicate or guard to an exact decision procedure before coding it, with a counterexample that marks its edge and a test that pins it. A plausible structural proxy standing in for a precise semantic condition is where the subtle bugs live.

Read the full file on GitHub · 48 lines

Changes

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.

  1. 29d ago Changed · +1 lines · +49 tokens per session 9169eae1ac2a
  2. 2mo ago First seen · 47 lines · 876 tokens per session scan A d65339e34ce0

Subscribe to this mod's changes

dblect CLAUDE.md is an instructions file published in the GitHub repository dvryaboy/dblect (22 stars, last pushed 24d ago), licensed Apache-2.0. It adds 925 tokens to every session, about $0.0037 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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