devin

A fully autonomous AI coding agent from Cognition that can use a browser, terminal, and complete development environment. A development environment is the tools and workspace used to build and test software.

In plain words
What is it for?
It is for autonomous software-development tasks involving a browser, terminal commands, and a full development workspace.
Why use it?
It can handle coding work across the tools developers commonly need, including browser and terminal tasks.

Agent

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 agents/sylphai-inc/codingagents.md/devin
Clone the repo
git clone --depth 1 https://github.com/SylphAI-Inc/codingagents.md
Per session 16 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 234 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00016 $0.00234
Opus 5 $0.00008 $0.00117
Sonnet 5 $0.00003 $0.00047
Haiku 4.5 $0.00002 $0.00023

Measured 2d ago against content hash ac086bb48236, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

devin 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.

src/content/docs/agents/devin.md · 38 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 38 lines · 16 tokens per session scan A ac086bb48236

Subscribe to this mod's changes

devin is an agent published in the GitHub repository SylphAI-Inc/codingagents.md (43 stars, last pushed 18d ago), with no licence file. It adds 16 tokens to every session and 234 once invoked, about $0.0001 per session on Opus 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.

Related

Other agents, from other repositories

frontend-specialist

Expert frontend engineer for building UI components, pages, forms, state management, and client-side logic. Adapts to any frontend framework based on project context.

faizkhairi/claude-code-blueprint · 36 tokens

t-800-brain-lead

Лид нейросети Skynet (T-800 Brain Lead). Use FIRST before creating skills, commands, subagents, rules or hooks. Routes to domain brains for authoritative Cursor docs. Use proactively when T-800 pipeline starts or user asks how Cursor feature works.

Khar-AG/t-800-agent · 62 tokens

t-800-brain-tools

Brain librarian for Agent tools: Terminal, Browser, Search, Canvas. Use when subagents need tool access patterns or MCP browser workflows. Readonly authoritative KB answers.

Khar-AG/t-800-agent · 40 tokens

experience-reviewer

Use this agent to judge whether a rendered UI holds up when its state and its viewport are varied — interaction states, flows, feedback, loading/empty/error handling, breakpoint adaptation, overflow, and touch ergonomics. Reads the shared capture bundle rather than driving the browser. See "When to invoke" in the…

carinyadigital/skills · 69 tokens

API Tester Specialist

Specialist in creating and executing API tests. Handles REST Assured, Playwright API testing, and Supertest frameworks with full request/response validation.

fugazi/test-automation-skills-agents · 34 tokens

critic

Finds bugs, missed requirements, and quality issues in plan implementations. Spawned after all tasks pass review for a final sweep.

codecast-sh/codecast · 28 tokens