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 agentmods add agents/evalstate/fast-agent/instructionsgit clone --depth 1 https://github.com/evalstate/fast-agentWhat 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 | $0.00000 | $0.01684 |
| Opus 5 | $0.00000 | $0.00842 |
| Sonnet 5 | $0.00000 | $0.00337 |
| Haiku 4.5 | $0.00000 | $0.00168 |
Grade A, and why
instructions 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 yesterday.
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 — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.
System Prompts
Agents can have their System Instructions set and customised in a number of flexible ways. The default System Prompt caters for Agent Skills, MCP Server Instructions, AGENTS.md and Shell access.
Template Variables
The following variables are available in System Prompt templates:
| Variable | Description | Notes |
|---|---|---|
{{internal:resource_id}} |
Loads packaged internal markdown resources | Example: {{internal:agent_cards}} |
{{file:path}} |
Reads and embeds local file contents (errors if file missing) | Must be a relative path (resolved relative to workspaceRoot) |
{{file_silent:path}} |
Reads and embeds local file contents (empty if file missing) | Must be a relative path (resolved relative to workspaceRoot) |
{{url:https://...}} |
Fetches and embeds content from an HTTP(S) URL | |
{{url:hf://...}} |
Fetches and embeds text content from Hugging Face Hub | |
{{serverInstructions}} |
MCP server instructions with available tools | Warning displayed in /mcp if Instructions are present and template variable missing |
{{agentSkills}} |
Agent skill manifests with descriptions | |
{{workspaceRoot}} |
Current working directory / workspace root | Set by Client in ACP Mode |
{{agentName}} |
Current agent name | |
{{agentType}} |
Current agent type | |
{{agentCardPath}} |
Source AgentCard path | (internal) when not loaded from a card |
{{agentCardDir}} |
Directory containing the source AgentCard | (internal) when not loaded from a card |
{{modelReferences}} |
Model references | Includes $system.default when one resolves. Useful for instructing CLI-based subagents |
{{model_specific}} |
Model-specific prompt guidance from the resolved model catalog entry or model overlay | Empty when the selected model has no model-specific guidance |
{{hostPlatform}} |
Host platform information | |
{{pythonVer}} |
Python version | |
{{env}} |
Formatted environment block with all environment details | |
{{currentDate}} |
Current date in long format |
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.
- yesterday First seen · 173 lines · 0 tokens per session scan A 1d4423906402
instructions is an agent published in the GitHub repository evalstate/fast-agent (3,904 stars, last pushed 2d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 1,684 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 2026-08-30.
Other agents, from other repositories
agentlas-core-engine-meta-agent
Use this agent when the user asks for /meta-agent, a single agent builder, multi-agent team builder, or packaging existing agents into Agentlas architecture.
Explore
Fast read-only codebase & docs exploration. Returns structured findings, never raw file dumps.
tech-lead
Technical lead agent – PR review/approval/merge, blocker resolution, and architecture/trade-off review aligned with Jira outcomes.
unittest-generator
Use this agent when you need to create unit tests for your code in unittest.TestCase format, organized in a tests folder with concept-based subfolders. Examples: Context: User has just written a new authentication module and needs comprehensive unit tests. user: 'I just finished writing my user authentication…
external-system-integration-expert
你负责把当前项目与外部 API、API 网关及业务系统安全地连接起来：识别集成边界、整理接口与环境差异、验证请求和响应、定位认证或数据契约问题。.
DocScribe
Write docs/ prose for a completed change, in caveman style, per the repo's Documentation Update Protocol. Use after a change lands to update docs/architecture.md, docs/ .md, README, or docs/AGENTS.md — the Rule-6 delegation target (main agent must NOT edit docs/ directly). Self-contained — give it the diff + target…