vscode-opencode AGENTS.md

Repository instructions for vscode-opencode, including preparation steps and rules for handling streamed chat responses and activity displays.

In plain words
What is it for?
Inspecting repository guidance, adding regression tests, tracing streamed events through the application, and preserving activity order and visible response content.
Why use it?
They help prevent lost, duplicated, reordered, or incorrectly replaced interface events when data moves from the software kit to the screen.

Instructions file for CodexOpenCode

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 instructions/chryzxc/vscode-opencode/agents-md
Clone the repo
git clone --depth 1 https://github.com/chryzxc/vscode-opencode

Made for: Codex, OpenCode.

Per session 599 This file is loaded in full into every session.
When invoked 599 The same file — it is already loaded in full.
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 $0.00599 $0.00599
Opus 5 $0.00300 $0.00300
Sonnet 5 $0.00120 $0.00120
Haiku 4.5 $0.00060 $0.00060

Measured 2d ago against content hash a8bef3ba7bd8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

vscode-opencode AGENTS.md 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.

AGENTS.md · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Instructions

These rules apply to AI agents working in this repository.

Before editing

  • Read the nearest AGENTS.md files for the files being changed.
  • Inspect git status --short and preserve unrelated worktree changes.
  • For streaming chat, activity timelines, hydration, deduplication, ordering, structured output, or collapsed/expanded response rendering, use the fixture or SDK debug data supplied with the issue. If none exists, add a minimal behavioral fixture before changing production code.
  • Trace the full path: SDK event → normalization → store/merge → ownership and ordering → rendered component.

Required implementation behavior

  • Add or update a regression test before changing streaming UI behavior.
  • Rendered activity rows are append-only within an assistant turn. Later partial events may enrich rows but must not clear or replace already rendered rows without an explicit removal event.
  • SDK transport IDs are not semantic visible-action identity. Do not dedupe distinct actions by title, timestamp, or mutable status.
  • Preserve first-arrival order across assistant phases and hydration.
  • A live response card and its transcript counterpart must have one response body owner; never render both copies for one assistant turn.
  • Structured output must be selected and rendered in both live and hydrated paths. Collapsed and expanded views must choose the same final response.
  • Do not add a fallback state owner or a new dedupe layer without a regression test covering the existing owner and merge path.

Validation

Run the focused tests first, then:

npm run guard:streaming
npm run typecheck
npm run webview:build
npm run build

Run npm run guard:prepush before handing off broad or cross-layer changes. The streaming contract guard is authoritative. Do not weaken, remove, skip, or rewrite a failing regression merely to make the guard pass.

Repository boundaries

  • src/ is the extension host; webview/shared/ is a separate Vite package.
  • Structured-output source files live in src/shared/; update generated webview contracts through npm run structured-output:sync.
  • Keep transport-only prompt payloads free of wrapper-authored policy text.
  • Do not remove existing user-facing controls or information density without explicit user direction.
  • Never use git restore, git checkout --, git clean, or reset commands to discard changes unless the user explicitly authorizes it.

Read the full file on GitHub · 65 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 · 65 lines · 599 tokens per session scan A a8bef3ba7bd8

Subscribe to this mod's changes

vscode-opencode AGENTS.md is an instructions file published in the GitHub repository chryzxc/vscode-opencode (11 stars, last pushed 16d ago), licensed MIT. It adds 599 tokens to every session, about $0.0030 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.