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.
npx skills add Tyler-R-Kendrick/agent-skills --skill devgit clone --depth 1 https://github.com/Tyler-R-Kendrick/agent-skillsWrote 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/skills/tyler-r-kendrick/agent-skills/dev)<a href="https://agentmods.dev/skills/tyler-r-kendrick/agent-skills/dev"><img src="https://agentmods.dev/badge/skills/tyler-r-kendrick/agent-skills/dev/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/skills/tyler-r-kendrick/agent-skills/dev"><img src="https://agentmods.dev/badge/skills/tyler-r-kendrick/agent-skills/dev.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 | $0.00088 | $0.01048 |
| Opus 5.5 | $0.00035 | $0.00419 |
| Sonnet 5.5 | $0.00018 | $0.00210 |
| Haiku 4.5 | $0.00009 | $0.00105 |
Grade A, and why
dev 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 2mo 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 — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Development Fundamentals
Overview
This skill covers the foundational knowledge every software developer should command — drawn from canonical published works and industry-proven practices. It spans from low-level algorithms through code craftsmanship to system-level architecture.
Knowledge Map
┌─────────────────────────────────────────────────────────┐
│ Architecture │
│ Microservices, Monoliths, DDD, Event-Driven, │
│ Hexagonal, Well-Architected Frameworks │
├─────────────────────────────────────────────────────────┤
│ Frontend │ Backend │
│ SPA, PWA, Micro-frontends, │ Data Modeling, API │
│ SSR, Islands Architecture │ Design, Caching, Auth │
├─────────────────────────────────────────────────────────┤
│ Integration Patterns │ Design Patterns │
│ EIP: Messaging, Routing, │ GoF: Creational, │
│ Transformation, Endpoints │ Structural, Behavioral │
├─────────────────────────────────────────────────────────┤
│ Algorithms & Data Structures │
│ Sorting, Searching, Graphs, DP, Combinatorial │
├─────────────────────────────────────────────────────────┤
│ Craftsmanship │
│ Clean Code, Clean Architecture, SOLID, 12-Factor, │
│ Refactoring, Boy Scout Rule │
└─────────────────────────────────────────────────────────┘
Canonical Works
| Book | Author | Covers |
|---|---|---|
| Design Patterns | Gamma, Helm, Johnson, Vlissides (GoF) | 23 object-oriented patterns |
| Enterprise Integration Patterns | Hohpe & Woolf | Messaging, routing, transformation |
| The Art of Computer Programming | Donald Knuth | Algorithms, data structures, combinatorics |
| Clean Code | Robert C. Martin | Naming, functions, formatting, comments |
| Clean Architecture | Robert C. Martin | Dependency rule, boundaries, layers |
| Refactoring | Martin Fowler | Code smells, refactoring catalog |
| Domain-Driven Design | Eric Evans | Bounded contexts, aggregates, ubiquitous language |
| Building Microservices | Sam Newman | Service decomposition, communication, deployment |
| The Pragmatic Programmer | Hunt & Thomas | Career, approach, tools, pragmatic philosophy |
| The Twelve-Factor App | Adam Wiggins (Heroku) | Cloud-native application methodology |
| Release It! | Michael Nygard | Stability patterns, capacity, deployment |
| Fundamentals of Software Architecture | Richards & Ford | Architecture styles, characteristics, decisions |
What ships with it
60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- AGENTS.md 4.8 KB
- algorithms/AGENTS.md 6.2 KB
- algorithms/combinatorial/AGENTS.md 10 KB
- algorithms/combinatorial/metadata.json 847 B
- algorithms/combinatorial/README.md 732 B
- algorithms/combinatorial/rules/_sections.md 1.6 KB
- algorithms/combinatorial/rules/_template.md 372 B
- algorithms/combinatorial/rules/combinatorial-always-add-pruning-to-backtracking-even-simple.md 458 B
- algorithms/combinatorial/rules/combinatorial-choose-variable-and-value-ordering-heuristics-carefully.md 456 B
- algorithms/combinatorial/rules/combinatorial-consider-whether-the-problem-has-symmetries-that-can-be.md 461 B
- algorithms/combinatorial/rules/combinatorial-for-optimization-problems-consider-branch-and-bound-before.md 435 B
- algorithms/combinatorial/rules/combinatorial-for-problems-with-overlapping-subproblems-e.md 426 B
- algorithms/combinatorial/rules/combinatorial-reference-knuth-s-taocp-vol.md 472 B
- algorithms/combinatorial/rules/combinatorial-use-constraint-propagation-forward-checking-arc.md 438 B
- algorithms/combinatorial/SKILL.md 11 KB
- algorithms/data-structures/AGENTS.md 8.7 KB
- algorithms/data-structures/metadata.json 814 B
- algorithms/data-structures/README.md 726 B
- algorithms/data-structures/rules/_sections.md 1.3 KB
- algorithms/data-structures/rules/_template.md 374 B
- algorithms/data-structures/rules/data-structures-choose-the-data-structure-based-on-the-dominant-operation.md 470 B
- algorithms/data-structures/rules/data-structures-consider-cache-locality.md 451 B
- algorithms/data-structures/rules/data-structures-for-concurrent-access-consider-concurrent-variants.md 447 B
- algorithms/data-structures/rules/data-structures-prefer-standard-library-implementations-they-are.md 456 B
- algorithms/data-structures/rules/data-structures-reference-knuth-s-taocp-vol.md 451 B
- algorithms/data-structures/rules/data-structures-remember-that-theoretical-complexity-is-not-the-full-story.md 514 B
- algorithms/data-structures/SKILL.md 9.7 KB
- algorithms/dynamic-programming/AGENTS.md 8.9 KB
- algorithms/dynamic-programming/metadata.json 838 B
- algorithms/dynamic-programming/README.md 772 B
- algorithms/dynamic-programming/rules/_sections.md 1.6 KB
- algorithms/dynamic-programming/rules/_template.md 378 B
- algorithms/dynamic-programming/rules/dynamic-programming-always-verify-optimal-substructure-before-applying-dp.md 510 B
- algorithms/dynamic-programming/rules/dynamic-programming-consider-whether-the-problem-admits-a-greedy-solution.md 428 B
- algorithms/dynamic-programming/rules/dynamic-programming-define-your-state-precisely-and-minimally-extra-state.md 434 B
- algorithms/dynamic-programming/rules/dynamic-programming-for-interview-competition-settings-practice-identifying.md 476 B
- algorithms/dynamic-programming/rules/dynamic-programming-reference-knuth-s-taocp-for-mathematical-rigor-on-sequence.md 495 B
- algorithms/dynamic-programming/rules/dynamic-programming-validate-your-recurrence-with-small-examples-before-coding.md 423 B
- algorithms/dynamic-programming/SKILL.md 9.9 KB
- algorithms/graph-algorithms/AGENTS.md 8.8 KB
- algorithms/graph-algorithms/metadata.json 845 B
- algorithms/graph-algorithms/README.md 752 B
- algorithms/graph-algorithms/rules/_sections.md 1.5 KB
- algorithms/graph-algorithms/rules/_template.md 375 B
- algorithms/graph-algorithms/rules/graph-algorithms-always-choose-the-simplest-algorithm-that-handles-your.md 525 B
- algorithms/graph-algorithms/rules/graph-algorithms-consider-whether-the-graph-is-a-dag-many-problems.md 478 B
- algorithms/graph-algorithms/rules/graph-algorithms-for-a-invest-time-in-designing-a-good-heuristic-the.md 436 B
- algorithms/graph-algorithms/rules/graph-algorithms-for-sparse-graphs-adjacency-list-representation-is-almost.md 505 B
- algorithms/graph-algorithms/rules/graph-algorithms-reference-knuth-s-taocp-for-rigorous-mathematical-analysis.md 454 B
- algorithms/graph-algorithms/rules/graph-algorithms-when-implementing-kruskal-s-always-use-union-find-with.md 462 B
- algorithms/graph-algorithms/SKILL.md 9.8 KB
- algorithms/metadata.json 783 B
- algorithms/README.md 1.6 KB
- algorithms/rules/_sections.md 1.2 KB
- algorithms/rules/_template.md 369 B
- algorithms/rules/algorithms-know-the-standard-library-most-languages-provide.md 395 B
- algorithms/rules/algorithms-prefer-algorithms-with-good-average-case-behavior-for.md 421 B
- algorithms/rules/algorithms-reference-knuth-s-taocp-for-rigorous-analysis-and.md 367 B
- algorithms/rules/algorithms-start-with-the-simplest-correct-algorithm-then-optimize-if.md 378 B
- algorithms/rules/algorithms-understand-amortized-costs-before-concluding-that-an.md 377 B
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.
- 2mo ago First seen · 90 lines · 88 tokens per session scan A 65e0af79cd88
dev is a skill published in the GitHub repository Tyler-R-Kendrick/agent-skills (13 stars, last pushed 5mo ago), licensed MIT. It adds 88 tokens to every session and 1,048 once invoked, about $0.0004 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.
dev compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| devTyler-R-Kendrick/agent-skills | Skill | 13 | 5mo ago | MIT | A | 88 | Claude Code |
| imagegenopenai/codex | Skill | 133k | yesterday | Apache-2.0 | A | 113 | Codex |
| playwright-climicrosoft/playwright | Skill | 99k | yesterday | Apache-2.0 | A | 19 | Claude Code |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | 4d ago | MIT | A | 200 | Claude Code, Codex |
| systematic-debuggingobra/superpowers | Skill | 313k | 3d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | yesterday | MIT | A | 95 | Claude Code |
| next-partial-prefetching-adoptionvercel/next.js | Skill | 143k | yesterday | MIT | A | 103 | Claude Code |