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session-binding

session-binding is a skill for Claude Code, Codex from protect-my-hair/nucleus-marketplace. It costs 34 tokens per session (514 once invoked), scanned A, original, MIT.

A collector that binds a Nucleus workflow to the current Claude Code or Codex session. It records the session identifier and transcript location and creates a report at a fixed repository path.

In plain words
What is it for?
Use it to collect, validate, and freeze session-binding reports before building or closing an approved workflow result.
Why use it?
It provides traceable evidence about which coding-agent session produced a workflow result without copying the conversation transcript.

Skill for Claude CodeCodex

Written for Claude Code and Codex: shipped in a Claude Code plugin, but also agents/openai.yaml present. Also seen: mentions Claude Code; mentions Codex.

Part of the nucleus plugin — 27 skills, 1 agent, 1 hook shipped together

not rated 162repo 1mo ago A scan SkillSpector: pass 34 tokens original MIT

Good fit Use it to collect, validate, and freeze session-binding reports before building or closing an approved workflow result.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/protect-my-hair/nucleus-marketplace/session-binding
View source ↗ protect-my-hair/nucleus-marketplace
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 protect-my-hair/nucleus-marketplace --skill session-binding
Clone the repo
git clone --depth 1 https://github.com/protect-my-hair/nucleus-marketplace

Made for: Claude Code, Codex.

Or install nucleus, the plugin that ships this one along with the rest of its 27 skills, 1 agent, 1 hook.

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 session-binding

README.md
[![agentmods](https://agentmods.dev/badge/skills/protect-my-hair/nucleus-marketplace/session-binding/github.svg)](https://agentmods.dev/skills/protect-my-hair/nucleus-marketplace/session-binding)
Your own site
<a href="https://agentmods.dev/skills/protect-my-hair/nucleus-marketplace/session-binding"><img src="https://agentmods.dev/badge/skills/protect-my-hair/nucleus-marketplace/session-binding/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.

agentmods 80×15 button for session-binding

Your own site · 80×15
<a href="https://agentmods.dev/skills/protect-my-hair/nucleus-marketplace/session-binding"><img src="https://agentmods.dev/badge/skills/protect-my-hair/nucleus-marketplace/session-binding.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 514 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00034 $0.00514
Opus 5 $0.00017 $0.00257
Sonnet 5 $0.00007 $0.00103
Haiku 4.5 $0.00003 $0.00051

Measured 12d ago against content hash 758aac2d6f40, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

session-binding 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 12d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/session_binding.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.

plugins/nucleus/skills/session-binding/SKILL.md · 53 lines

What it actually says

Session Binding

本 Skill 为 Nucleus V2 workflow 生成固定路径的 session binding report：

.nucleus/runs/<workflowRunId>/session-binding/session-binding-report.json

它只记录原生会话 ID、显式 transcript 路径和 hash，不复制 Claude/Codex transcript 或 JSONL 正文。

子命令

python3 skills/session-binding/scripts/session_binding.py collect \
  --repo-root <target-repo> \
  --context <target-repo>/.nucleus/context/<workflowRunId>.json \
  --provider-policy auto \
  --codex-json-event <event.json>

python3 skills/session-binding/scripts/session_binding.py freeze \
  --repo-root <target-repo> \
  --context <target-repo>/.nucleus/context/<workflowRunId>.json \
  --session-binding-report <target-repo>/.nucleus/runs/<workflowRunId>/session-binding/session-binding-report.json \
  --reason completed

python3 skills/session-binding/scripts/session_binding.py validate-report \
  --report <target-repo>/.nucleus/runs/<workflowRunId>/session-binding/session-binding-report.json

证据规则

  • explicit context / CLI metadata 优先。
  • Codex JSON event 和 Claude hook JSON 是可靠 event evidence。
  • CODEX_THREAD_ID 只能作为 local-verified-env-candidate；strict/PMS 模式不接受单独 env candidate。
  • Claude transcriptPath 只接受 hook JSON、explicit metadata、CLI 参数或 PMS connector 明确输出。
  • 禁止 discoveryMethod=latest|mtime|only-file。
  • 禁止 transcript 正文、message array、JSONL event array 进入 report。
  • strict/PMS 或 constraints.sessionBindingRequired=true 缺可靠绑定时必须输出 blocker。

边界

  • 不 import 根 harness/。
  • 不写 docs/requirement/**。
  • .nucleus/runs/<workflowRunId>/session-binding 若是 symlink，runtime 输出 stdout blocked payload，不写仓库文件。
  • transcript hash 只在 completed、cancelled、pms-freeze-requested freeze reason 下计算。
Files

What ships with it

4 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.

  1. 12d ago First seen · 53 lines · 34 tokens per session scan A 758aac2d6f40

Subscribe to this mod's changes

session-binding is a skill published in the GitHub repository protect-my-hair/nucleus-marketplace (162 stars, last pushed 1mo ago), licensed MIT. It adds 34 tokens to every session and 514 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 2026-08-30.

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