symbi-init

symbi-init is a skill for Claude Code, Codex from ThirdKeyAI/symbi-gemini-cli. It costs 48 tokens per session (447 once invoked), scanned A, original, Apache-2.0.

A setup guide for Symbiont-governed projects, where AI agents have defined permissions and policies.

In plain words
What is it for?
Use it to initialize a new project or add Symbiont to an existing one, including agent definitions, Cedar policies, runtime settings, and a starter assistant.
Why use it?
It creates the basic project files and configuration needed to start managing agent access and actions.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions AGENTS.md.

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 skills/thirdkeyai/symbi-gemini-cli/symbi-init
Any agent
npx skills add ThirdKeyAI/symbi-gemini-cli --skill symbi-init
Clone the repo
git clone --depth 1 https://github.com/ThirdKeyAI/symbi-gemini-cli

Made for: Claude Code, Codex.

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.

agentmods badge for symbi-init

README.md
[![agentmods](https://agentmods.dev/badge/skills/thirdkeyai/symbi-gemini-cli/symbi-init.svg)](https://agentmods.dev/skills/thirdkeyai/symbi-gemini-cli/symbi-init)
Your own site
<a href="https://agentmods.dev/skills/thirdkeyai/symbi-gemini-cli/symbi-init"><img src="https://agentmods.dev/badge/skills/thirdkeyai/symbi-gemini-cli/symbi-init.svg" alt="Measured on agentmods" height="20"></a>
Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 447 The whole file, excluding the scripts and references it only reads on demand.
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 5.1 $0.00048 $0.00447
Opus 5 $0.00024 $0.00224
Sonnet 5 $0.00010 $0.00089
Haiku 4.5 $0.00005 $0.00045

Measured 5d ago against content hash 45510d69fbb2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

symbi-init 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 5d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

skills/symbi-init/SKILL.md · 78 lines

What it actually says

Initialize Symbiont Project

Set up a governed agent project in the current directory.

Steps

  1. Check if symbiont.toml already exists. If so, ask before overwriting.

  2. Create the directory structure:

    agents/          # Agent DSL definitions
    policies/        # Cedar policy files
    
  3. Create symbiont.toml with sensible defaults:

    [runtime]
    security_tier = "tier1"   # Docker isolation
    log_level = "info"
    
    [policy]
    engine = "cedar"
    enforcement = "strict"
    
    [schemapin]
    mode = "tofu"  # Trust-On-First-Use
    
  4. Create a starter agent at agents/assistant.dsl:

    metadata {
        version = "1.0.0"
        description = "Default governed assistant"
    }
    
    agent assistant(input: Query) -> Response {
        capabilities = ["read", "analyze"]
    
        policy default_access {
            allow: read(input) if true
            deny: write(any) if not approved
            audit: all_operations
        }
    
        with memory = "session" {
            result = process(input)
            return result
        }
    }
    
  5. Create a starter Cedar policy at policies/default.cedar:

    // Default: allow read operations, require approval for writes
    permit(
        principal,
        action == Action::"read",
        resource
    );
    
    forbid(
        principal,
        action == Action::"write",
        resource
    ) unless {
        principal.approved == true
    };
    
  6. Create AGENTS.md manifest for the project.

  7. Report what was created and suggest next steps.

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. 5d ago First seen · 78 lines · 48 tokens per session scan A 45510d69fbb2

Subscribe to this mod's changes

symbi-init is a skill published in the GitHub repository ThirdKeyAI/symbi-gemini-cli (3 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 48 tokens to every session and 447 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 2026-08-31.