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 SII-Holos/synergy --skill add-agentgit clone --depth 1 https://github.com/SII-Holos/synergyWrote 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/sii-holos/synergy/add-agent)<a href="https://agentmods.dev/skills/sii-holos/synergy/add-agent"><img src="https://agentmods.dev/badge/skills/sii-holos/synergy/add-agent/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.
<a href="https://agentmods.dev/skills/sii-holos/synergy/add-agent"><img src="https://agentmods.dev/badge/skills/sii-holos/synergy/add-agent.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00066 | $0.01009 |
| Opus 5 | $0.00033 | $0.00504 |
| Sonnet 5 | $0.00013 | $0.00202 |
| Haiku 4.5 | $0.00007 | $0.00101 |
Grade A, and why
add-agent 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 today.
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 — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add a Built-in Agent
Establish the Boundary
- Confirm the request requires a repository-built agent. Route configurable agents to
60-agents.jsonc, plugin agents to the plugin SDK, and external coding agents toexternal-agent/. - Read Cortex, Workflows, and Execution boundaries when delegation, review, or permissions are involved.
- Inspect
agent.ts,builtin-context.ts, the targetbuiltin-*.ts, and two neighboring agent factories. Treat these files as authoritative; do not copy an old inventory from documentation. - Load
integrate-llmwhen host code will invoke the agent for classification, extraction, generation, review, or delegated work. Decide explicitly whether the call is sessionless, continues an existing session, or launches a Cortex child.
Implement
- Choose the owning catalog:
- primary orchestrator:
builtin-primary.ts - classic subagent:
builtin-legacy-subagents.ts - coding-harness subagent: a prompt factory registered in
builtin-max-subagents.ts - hidden utility or model-only agent:
builtin-internal.ts
- primary orchestrator:
- Add or update the prompt under
agent/prompt/. Match the nearest flat prompt orbase.txtplusbuilder.tspattern. Keep product policy in code/config contracts and keep the prompt focused on the agent's role and completion criteria. - Define the agent with the current
Agent.InfoorcreateSubagent(ctx, definition)contract. Select the narrowest existingSubagentPermissionProfile; add a new profile only when no current profile expresses the required capability boundary. - Keep tool exposure separate from authorization. Native task-callable subagents retain the common
search_toolsandexpand_toolspermissions so they can activate deferred tools already allowed by their profile; profile-specific denies must still keep those tools unavailable after expansion. - Set
visibleTo,delegationGroups, andhiddendeliberately. Primary agents may target only agents exposed through their catalog. BlueprintLoop and Light Loop reviewers remain host-selected rather than direct primary targets, while their Cortex tasks are visible in the execution session's Subagent Dock. - Register a new max-subagent factory in
FACTORIES; register other new catalogs throughAgent.create()only if a genuinely new catalog is required. - Update generated agent-table behavior or tests if the new agent changes routing-visible metadata. Do not maintain a second hand-written agent list in prompts or docs.
- Keep agent registration separate from invocation. A hidden model-only agent does not by itself justify a new local
LLM.stream()wrapper or a manually created child session.
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.
- today Changed · -1 tokens per session 07eb1e39a1f3
- 9d ago First seen · 47 lines · 67 tokens per session scan A a72fe4529701
add-agent is a skill published in the GitHub repository SII-Holos/synergy (548 stars, last pushed today), licensed MIT. It adds 66 tokens to every session and 1,009 once invoked, about $0.0003 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.
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