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 darellchua2/opencode-config-template --skill nextjs-devtools-mcp-skillgit clone --depth 1 https://github.com/darellchua2/opencode-config-templateWrote 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/darellchua2/opencode-config-template/nextjs-devtools-mcp-skill)<a href="https://agentmods.dev/skills/darellchua2/opencode-config-template/nextjs-devtools-mcp-skill"><img src="https://agentmods.dev/badge/skills/darellchua2/opencode-config-template/nextjs-devtools-mcp-skill.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00042 | $0.01731 |
| Opus 5 | $0.00021 | $0.00865 |
| Sonnet 5 | $0.00008 | $0.00346 |
| Haiku 4.5 | $0.00004 | $0.00173 |
Grade A, and why
nextjs-devtools-mcp-skill 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 4d 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 — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.
What this skill does
- Documents the
next-devtools-mcpserver and its 6 tools - Provides
opencode.jsonconfiguration (bothmcpandtoolsblocks) - Prescribes workflows for error diagnosis, route analysis, page debugging, server action debugging, and project audits
- Covers common MCP connection issues and fallback strategies
Reference: https://nextjs.org/docs/app/guides/mcp
Requirements & Honesty Note
| Requirement | Status |
|---|---|
Next.js 16+ (for built-in /_next/mcp endpoint) |
Project dependency |
Running Next.js dev server (npm run dev) |
Required for live features |
next-devtools-mcp server in opencode.json mcp block |
Required for MCP tool access |
next-devtools* set to true in opencode.json tools block |
Currently default false — user must opt in |
If any requirement is unmet, MCP tools will return connection errors. Fall back to file-based inspection (glob/grep/read) and webfetch to Next.js docs.
opencode.json Configuration
Add the next-devtools MCP server to your project opencode.json:
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"next-devtools": {
"type": "local",
"command": ["npx", "-y", "next-devtools-mcp@latest"],
"enabled": true
}
},
"tools": {
"next-devtools*": true
}
}
Notes:
- OpenCode uses
opencode.jsonwith themcpkey, NOT.mcp.jsonwithmcpServers. - Command is array format
["npx", "-y", "pkg"], not separatecommand+argsfields. - Both
mcp.next-devtools.enabled: trueANDtools."next-devtools*": trueare required. - MCP endpoint URL (when dev server runs):
http://localhost:3000/_next/mcp
Available MCP Tools
| Tool | Description | Use Case |
|---|---|---|
get_errors |
Build, runtime, and type errors | Debug compilation and runtime issues |
get_logs |
Path to dev log file (browser + server) | Access browser console + server output |
get_page_metadata |
Metadata about specific pages | Understand page structure and rendering |
get_project_metadata |
Project structure and configuration | Analyze project setup |
get_routes |
All routes grouped by router type | Map application routing |
get_server_action_by_id |
Look up Server Actions by ID | Debug Server Action references |
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.
- 4d ago First seen · 168 lines · 42 tokens per session scan A 6b5cb1b4a38a
nextjs-devtools-mcp-skill is a skill published in the GitHub repository darellchua2/opencode-config-template (6 stars, last pushed yesterday), licensed Apache-2.0. It adds 42 tokens to every session and 1,731 once invoked, about $0.0002 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 2026-09-03.
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