implementation-intermediate

A step-by-step guide for building an intermediate software feature from an approved plan and design.

In plain words
What is it for?
Use it to break a feature into modules, implement them one at a time, run unit tests, check code quality, and integrate the result with existing systems.
Why use it?
It reduces missed requirements and inconsistent code by organizing the work into smaller parts, with testing and review after each part.

Cursor rule for Cursor

Install

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.

agentmods
npx agentmods add rules/alkoleft/platform-context-exporter/implementation-intermediate
Clone the repo
git clone --depth 1 https://github.com/alkoleft/platform-context-exporter

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 1,147 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod 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 $0.00000 $0.01147
Opus 5 $0.00000 $0.00574
Sonnet 5 $0.00000 $0.00229
Haiku 4.5 $0.00000 $0.00115

Measured 2d ago against content hash 9d80a36079f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

implementation-intermediate 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 2d 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.

Origin

This is a copy

100% identical to implementation-intermediate — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.cursor/rules/isolation_rules/Level3/implementation-intermediate.mdc · 73 lines

How it starts

The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.

LEVEL 3 IMPLEMENTATION: BUILDING INTERMEDIATE FEATURES

TL;DR: This guide focuses on the systematic implementation of a planned and designed Level 3 feature. It emphasizes modular development, strict adherence to creative decisions and the style guide, integration with existing systems, and thorough feature-specific testing.

🛠️ Level 3 Feature Implementation Workflow

This workflow outlines the typical steps for building an intermediate feature.

graph TD
    StartImpl["Start L3 Implementation"] -->
    ReviewDocs["1. Review All Relevant Docs<br>(Tasks, Creative Docs, Style Guide)"] -->
    SetupEnv["2. Setup/Verify Dev Environment<br>(Branch, Tools, Dependencies)"] -->
    ModuleBreakdown["3. Break Down Feature into Modules/Major Components<br>(Based on plan in `tasks.md`)"] -->
    BuildIterate["4. Implement Modules/Components Iteratively"]

    BuildIterate --> ImplementModule["4a. Select Next Module/Component"]
    ImplementModule --> CodeModule["4b. Code Module<br>(Adhere to design, style guide, coding standards)"]
    CodeModule --> UnitTests["4c. Write & Pass Unit Tests"]
    UnitTests --> SelfReview["4d. Self-Review/Code Linting"]
    SelfReview --> MoreModules{"4e. More Modules<br>for this Feature?"}
    MoreModules -- Yes --> ImplementModule

    MoreModules -- No --> IntegrateModules["5. Integrate All Feature Modules/Components"]
    IntegrateModules --> IntegrationTesting["6. Perform Integration Testing<br>(Feature modules + existing system parts)"]
    IntegrationTesting --> E2EFeatureTesting["7. End-to-End Feature Testing<br>(Validate against user stories & requirements)"]
    E2EFeatureTesting --> AccessibilityCheck["8. Accessibility & Responsiveness Check<br>(If UI is involved)"]
    AccessibilityCheck --> CodeCleanup["9. Code Cleanup & Refinement"]
    CodeCleanup --> UpdateMB["10. Update Memory Bank<br>(`tasks.md` sub-tasks, `progress.md` details)"]
    UpdateMB --> FinalFeatureReview["11. Final Feature Review (Conceptual Peer Review if possible)"]
    FinalFeatureReview --> ImplementationDone["L3 Implementation Complete<br>Ready for REFLECT Mode"]

    style StartImpl fill:#e57373,stroke:#f44336
    style BuildIterate fill:#ffcdd2,stroke:#ef9a9a
    style ImplementationDone fill:#ef9a9a,stroke:#e57373

Read the full file on GitHub · 73 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. 2d ago First seen · 73 lines · 0 tokens per session scan A 9d80a36079f7

Subscribe to this mod's changes

implementation-intermediate is a cursor rule published in the GitHub repository alkoleft/platform-context-exporter (48 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,147 tokens. A static security scan graded it A with 0 findings. It is 100% identical to implementation-intermediate, differing in 0 lines, and is treated as a copy.