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Claude Guidelines

AI directives only (permissions, guardrails, doc references) — project conventions belong in docs/. Rules must be concise. One rule per line when possible.

This file takes precedence over auto-memory. If an auto-memory entry contradicts a rule here, follow this file and update or remove the conflicting memory; do not act on the stale memory.

General

  • Build/test/format/lint via cargo (cargo build, cargo test, cargo fmt, cargo clippy). A justfile may wrap multi-crate shortcuts, but cargo is the source of truth
  • File names: lowercase, kebab-case for docs and assets. Rust modules follow snake_case per the compiler
  • Check existing docs before creating new files
  • Never name a file path in a recommendation without verifying its existence (Read/ls/find) in the current session — mark explicitly as "to confirm" if unverified
  • All written artifacts (docs, code, comments, commit messages, issues, PRs) are in English — user-facing UI strings live in i18n resources
  • Responses ≤ 15 lines by default. Tables only when tabular beats prose. Background / rationale only on explicit request
  • When the user asks for an opinion, be severe, honest and challenging — the goal is code that meets professional standards, not the user's agreement. Zero flattery, no hedging, no false balance
  • Verdict first (1 line), then 3 bullets of substance at most. Say plainly when something is wrong, and say so when it is right — an unearned validation is a defect
  • Quality over satisfaction — push back on over-engineering, incoherence, and unjustified additions, including when user-proposed
  • Critique constructively: acknowledge what is sound first, cite established standards (RFC, WCAG, NN/G, language idioms) rather than personal preference, propose the correction — never mere opposition, never a strawman of the user's position
  • The user decides in the end: challenge until the decision, then execute it in full. If a debate cycles past 3 iterations on the same axis without converging, propose to decide rather than continue
  • Flag security, cryptographic, performance, and design issues immediately when noticed
  • Never assume a produced artifact matches its request — a generation, a render or a transform routinely ignores or distorts instructions. Before judging, presenting or consuming it, inspect what was actually produced and state the invariant it must satisfy; where the invariant is checkable, write the check that counts the violations. Claiming "it now matches X" without having verified is a defect.

Documentation

  • All documentation lives under docs/ — never in a crate source directory (root README.md and tool config files are not documentation)
  • Documentation strategy: see docs/adr/0001-documentation-strategy.md for audience, source of truth, document types, lifecycle, level of detail, and format/style decisions
  • docs/design/ is source of truth: WHAT the system does, WHY when non-obvious
  • docs/<crate>/ describes HOW design is implemented; reference design, never restate
  • docs/sync-protocol.md is the canonical wire format — design must not paraphrase it
  • Code is never source of truth — a code/design disagreement means the code is the bug, or the design needs an explicit amendment, never both silently
  • If the design is silent on a needed behavior, write the design first, then the code
  • Anchor a confirmed non-obvious decision — especially one where an alternative was rejected — in the design docs or an ADR before building on it
  • Group docs by single coherent concern — broad-keyword grab-bags (security, utils) are forbidden
  • ADR lifecycle: never delete an ADR; a reversal is a new ADR, and both sides carry the link — Superseded by ADR-NNN on the old, Supersedes ADR-MMM on the new. A one-sided link is how the chain rots
  • An ADR whose decision no longer applies, with no replacement, is marked Deprecated — never edited away or moved
  • In-place edits only for corrections of form and for clarifications that do not change the decision

Design & ADRs (docs/design/, docs/adr/, docs/<crate>/adr/)

  • Modifying, deleting, OR adding documents: FORBIDDEN without explicit consent — propose first, wait for approval
  • Trivial fixes (typos, broken links, markdown formatting): allowed without consent

Git

  • Commit conventions: follow docs/git-commits.md strictly
  • Git workflow: follow docs/git-workflow.md strictly
  • Issue conventions: follow docs/git-issues.md strictly
  • For commits, PR creation, PR merges to develop, and GitHub issue creation, invoke the corresponding slash command yourself via the Skill tool (/git-commit, /gh-pr-create, /gh-merge-develop, /gh-issue). Do not run git commit, gh pr create, gh pr merge, or gh issue create directly. Do not ask the user to type the slash command. Respect each playbook's approval gates
  • Before making changes, check branch — if on main or develop, propose a branch name and wait
  • Unrelated bug found during work: create a GitHub issue, never fix it in the current branch
  • No AI references (Co-Authored-By, Generated by, etc.) in commits or code
  • Before implementing an issue older than ~1 month, audit it against current code and design: close with evidence if already delivered, post an audit comment refreshing stale references/scope if the architecture drifted, implement as-is only if still accurate

Crates (core/, cli/, relay/, and future gui/, android/)

  • Follow docs/code-comments.md strictly
  • core holds all security-critical logic (crypto, CRDT, sync) — clients must not reimplement it
  • Changes to core::crypto or the wire format require updating docs/sync-protocol.md in the same diff and stating the security invariant affected
  • The relay must remain zero-knowledge — never add a code path that could read or log note plaintext or the E2E key

UI changes (Android)

  • Full workflow: follow docs/ui-change-workflow.md strictly
  • Mockup-first: before any UI-modifying change (including additions to an existing surface), produce a mockup Artifact (static HTML of the touched surfaces and states, light+dark, realistic data including edge cases; debated variants side by side) and obtain explicit validation before writing code
  • Exemptions: provably pixel-identical refactors, and fixes restoring an existing rendering with no new surface
  • Before merge, validate the result visually: share in the conversation adb screencap screenshots of each changed surface — initial state + principal interaction state (keyboard/sheet open), both themes — captured on the emulator only (ANDROID_SERIAL=emulator-5554, never a physical device)
  • Screenshots live in the scratchpad; never put screenshot paths in the PR body, a commit, or any git-tracked file
  • Roborazzi golden tests are the automated conformance gate (both themes, CI-enforced): add/record a golden for any new read-only rendering surface; the manual screenshots cover interactive states Roborazzi cannot reach
  • Each visual-validation request states what to check: one line per screenshot naming the elements/states and the expected outcome
  • GTK / CLI / relay: no mockup or screenshot gate yet (no headless display, or no visual surface)

Testing

  • Never modify existing tests without explicit approval
  • If a test fails after code changes, report it instead of fixing it silently
  • Adding new tests is always allowed
  • When you add or modify user-observable code, propose the corresponding test in the same response as the code change
  • Bug fixes start with a failing test that reproduces the bug: write the test first and watch it fail, then fix, then re-run it green (red → green)
  • That test stays as the regression test for this bug — reference the issue number in it, so a later reader knows what it guards and does not delete it as noise
  • Bug fixes must reproduce the failure from observed evidence (logs, network capture, repro steps); never invent the failure scenario from a hypothesis