What is skill-session-state?

A session-state system that saves an agent's current mode, task, and summary so work can continue after a reset.

It stores the latest task state in a local session file and restores that context at the start of a new session.

It prevents important context from being lost when the session window is cleared or restarted.

skill-session-state — Skill for Claude Code and Codex by MatrixFounder

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 MatrixFounder/Agentic-development --skill skill-session-state

Clone the repo

git clone --depth 1 https://github.com/MatrixFounder/Agentic-development

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/matrixfounder/agentic-development/skill-session-state/github.svg)](https://agentmods.dev/skills/matrixfounder/agentic-development/skill-session-state)

Your own site

<a href="https://agentmods.dev/skills/matrixfounder/agentic-development/skill-session-state"><img src="https://agentmods.dev/badge/skills/matrixfounder/agentic-development/skill-session-state/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/matrixfounder/agentic-development/skill-session-state"><img src="https://agentmods.dev/badge/skills/matrixfounder/agentic-development/skill-session-state.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 21 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,299 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 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.

Model	Per session	Once invoked
Fable 5.1	$0.00021	$0.01299
Opus 5.5	$0.00008	$0.00520
Sonnet 5.5	$0.00004	$0.00260
Haiku 4.5	$0.00002	$0.00130

Measured 1mo ago against content hash 65801677e87f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skill-session-state 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/tests/test_update_state.py, scripts/update_state.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.

.agent/skills/skill-session-state/SKILL.md · 109 lines

How it starts

The opening of the file, as written. The whole thing — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Session State Management

This skill provides the mechanism to persist your current working state to a file. This allows you to "reboot" from a seamless context state if the session window is reset.

1. The Session File

Path: .agent/sessions/latest.yaml — resolved from the repo root regardless of the invocation CWD (walk-up to .git, CLAUDE_PROJECT_DIR fallback; SS-1).
Purpose: Stores the exact arguments from your last task_boundary call, plus session metadata.
Persistence: surviving session clears, allowing you to pick up exactly where you left off.
Never committed: this is per-machine runtime data — .agent/sessions/ is gitignored (SS-2). Do not git add it and do not ship a committed "seed" state.

2. Boot Protocol (Start of Session)

IF .agent/sessions/latest.yaml exists AND you are starting a new session (blank context):

READ the file using read_file or view_file.
RESTORE your state:
- Set your internal Mode to the file's mode.
- Set your TaskName and TaskStatus to the file's current_task.
- Read the context_summary to understand what you were doing.
- Check active_blockers to see if you were blocked.

3. Update Protocol (During Work)

First: can you execute at all? This skill is TIER 0 — it loads into every role, including the read-only reviewers and critics (task-reviewer, plan-reviewer, architecture-reviewer, critic-*), which are declared without an execution tool on purpose. If you have no way to run a command, this section does not apply to you: session state is the ORCHESTRATOR's to persist, you have no phase boundary of your own to record, and you should proceed to your actual task. Do not spend your turn attempting the command — a mandatory-sounding instruction that a role cannot satisfy is how a subagent burns its whole turn and returns nothing (skill-parallel-orchestration §2.4).

Read the full file on GitHub · 109 lines

Files

What ships with it

2 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 Changed · +6 lines 65801677e87f
1mo ago First seen · 103 lines · 21 tokens per session scan A bc1607a81058

Subscribe to this mod's changes

skill-session-state is a skill published in the GitHub repository MatrixFounder/Agentic-development (6 stars, last pushed yesterday), licensed Apache-2.0. It adds 21 tokens to every session and 1,299 once invoked, about $0.0001 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 2026-08-31.

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