byteplus-coder

A coding agent that uses BytePlus ModelArk's Coding Plan through an OpenAI-compatible programming interface. It works with text and requires a BytePlus Coding Plan API key and a chosen plan model.

In plain words
What is it for?
Use it for terminal-based coding tasks, difficult programming work, or changes across a large repository.
Why use it?
It lets coding work use subscription quota instead of separate per-token API credits. You must configure the service and select the model yourself.

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/nafjan/summon/byteplus-coder
Clone the repo
git clone --depth 1 https://github.com/Nafjan/summon
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 810 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00000 $0.00810
Opus 5 $0.00000 $0.00405
Sonnet 5 $0.00000 $0.00162
Haiku 4.5 $0.00000 $0.00081

Measured 2d ago against content hash 142c42ae98be, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

byteplus-coder 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.

skills/summon/agents/byteplus-coder.md · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

BytePlus ModelArk Coding Plan coder (openai-compat)

Subscription-quota coding agent via ModelArk Coding Plan (/api/coding/v3). Set BYTEPLUS_CODING_API_KEY. Text-only; pin a plan model id (not auto). For always-PAYG Platform API use, skip this agent and pass an inline openai-compat base_url ending in /api/v3 instead.

Uses your BytePlus ModelArk Coding Plan subscription via the OpenAI-compatible endpoint. Bills against your Coding Plan subscription quota (not per-token API credits). Set BYTEPLUS_CODING_API_KEY in your environment.

Pin a current Coding Plan model by task: deepseek-v4-flash for fast terminal loops, deepseek-v4-pro for hard coding, glm-5.2 for long-horizon/large-repo work, or dola-seed-2.0-code for agentic coding. The separate Ark marketplace currently lists exact GA IDs deepseek-v4-flash-ga-260731, deepseek-v4-pro-ga-260813, and glm-5-2-260617; those are cataloged for explicit arkcli +chat routes, but are not silently substituted into this Coding Plan agent until plan eligibility and a minimal text smoke are verified. kimi-k2.5 is a useful code/UI alternative; the Seed Pro/Lite variants are general-purpose choices.

Strongly avoid legacy or superseded roster entries for new work: glm-5.1, bytedance-seed-code, and gpt-oss-120b. The latter two were still listed but failed live Coding Plan probes as of 2026-08-07. Roster presence is not proof of availability: refresh with arkcli plans model-list --plan coding-plan --format json, then validate a minimal text call. (auto is an arkcli router and is refused by Summon's raw API backend.)

All Coding Plan models are text-only — do not use this agent for tasks requiring image/vision input (Cursor screenshots, diagrams, etc.). This definition declares capability: text-only so Summon may dispatch it without --allow-text-only on a single call; every such run still carries a loud TEXT SEAT warning. Council/manifest still require SUMMON_ALLOW_TEXT_ONLY=1 (capability alone does not authorize fan-out). For repo/tool loops, use a toolful CLI agent instead.

For other regions, override byteplus-coding in providers.json with your regional base URL (e.g. ark.cn-beijing.volces.com/api/coding/v3).

Read the full file on GitHub · 64 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 · 64 lines · 0 tokens per session scan A 142c42ae98be

Subscribe to this mod's changes

byteplus-coder is an agent published in the GitHub repository Nafjan/summon (4 stars, last pushed 4d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 810 tokens. 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.