What is nexus-agents?

A guide for adding, changing, and checking Nexus agents and tools. It also explains the rules tools must follow, how they are registered, how capabilities are limited, and the expected ToolManager data shape.

Use it when modifying an agent or tool, wiring registration, adding capability checks, investigating an unresolved command, or changing ToolManager payloads.

It helps prevent changes that compile but are not discoverable, allowed, or compatible with the server's tool contract. It also covers cases where documented commands do not resolve.

nexus-agents — Skill for Claude Code by cbruyndoncx

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.

Any agent

npx skills add cbruyndoncx/ThirdBrAIn-MCPSERVERS-IQ --skill nexus-agents

Clone the repo

git clone --depth 1 https://github.com/cbruyndoncx/ThirdBrAIn-MCPSERVERS-IQ

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/cbruyndoncx/thirdbrain-mcpservers-iq/nexus-agents/github.svg)](https://agentmods.dev/skills/cbruyndoncx/thirdbrain-mcpservers-iq/nexus-agents)

Your own site

<a href="https://agentmods.dev/skills/cbruyndoncx/thirdbrain-mcpservers-iq/nexus-agents"><img src="https://agentmods.dev/badge/skills/cbruyndoncx/thirdbrain-mcpservers-iq/nexus-agents/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/cbruyndoncx/thirdbrain-mcpservers-iq/nexus-agents"><img src="https://agentmods.dev/badge/skills/cbruyndoncx/thirdbrain-mcpservers-iq/nexus-agents.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 798 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00060	$0.00798
Opus 5.5	$0.00024	$0.00319
Sonnet 5.5	$0.00012	$0.00160
Haiku 4.5	$0.00006	$0.00080

Measured 1mo ago against content hash 98b5ea1f23e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nexus-agents 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 1mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/check_documented_commands.py, scripts/cli_name.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

nexus/.claude/skills/nexus-agents/SKILL.md · 59 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

12 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.

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.

1mo ago First seen · 59 lines · 60 tokens per session scan A 98b5ea1f23e9

Subscribe to this mod's changes

nexus-agents is a skill published in the GitHub repository cbruyndoncx/ThirdBrAIn-MCPSERVERS-IQ (0 stars, last pushed 8d ago), with no licence file. It adds 60 tokens to every session and 798 once invoked, about $0.0002 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 2026-09-14.

Backend and APIs Building agents

nexus-agents next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
nexus-agentscbruyndoncx/ThirdBrAIn-MCPSERVERS-IQ	Skill	0	8d ago	none	A	60	Claude Code
mem0-oss-to-platformmem0ai/mem0	Skill	69k	3d ago	Apache-2.0	A	217	Claude Code, Codex
azure-mgmt-botservice-dotnetmicrosoft/skills	Skill	3.2k	today	MIT	A	78	Claude Code
fastapi-router-pymicrosoft/skills	Skill	3.2k	today	MIT	A	46	Claude Code
api-designericrisco/rsc-harness	Skill	555	5d ago	MIT	A	105	Claude Code, Codex
migrate-segw-to-raparc-mcp/arc-1	Skill	253	2d ago	MIT	A	106	Claude Code
telnyx-messaging-hosted-curlteam-telnyx/ai	Skill	225	yesterday	MIT	A	45	Claude Code