1c-ssl-skills: Skill for Claude Code

.agents/skills/self-managed-context/SKILL.md

self-managed-context is a skill for Claude Code, Codex from brake71/1c-ssl-skills. It costs 149 tokens per session (5,042 once invoked), scanned A, a copy of self-managed-context, MIT.

A guide to agents that edit and manage their own live context: the information currently available to the model. It covers retaining, compacting, evicting, and rewriting context through an editable file.

In plain words
What is it for?
Use it when an agent must decide what stays in working context, compress older material, remove irrelevant details, or update context in place during extended work.
Why use it?
Long tasks can exceed the available context, while careless edits can remove important information or increase processing cost. This helps design safe rules for model-controlled context management.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions subagents; installed under .agents/ (shared by several agents).

This is brake71/1c-ssl-skills's own configuration. It tells Claude Code and Codex how to work on 1c-ssl-skills itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything 1c-ssl-skills configures →

Reuse

Borrowing it

Nothing to install: this file belongs to brake71/1c-ssl-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/brake71/1c-ssl-skills/main/.agents/skills/self-managed-context/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/brake71/1c-ssl-skills

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 self-managed-context

README.md
[![agentmods](https://agentmods.dev/badge/skills/brake71/1c-ssl-skills/self-managed-context/github.svg)](https://agentmods.dev/skills/brake71/1c-ssl-skills/self-managed-context)
Your own site
<a href="https://agentmods.dev/skills/brake71/1c-ssl-skills/self-managed-context"><img src="https://agentmods.dev/badge/skills/brake71/1c-ssl-skills/self-managed-context/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 self-managed-context

Your own site · 80×15
<a href="https://agentmods.dev/skills/brake71/1c-ssl-skills/self-managed-context"><img src="https://agentmods.dev/badge/skills/brake71/1c-ssl-skills/self-managed-context.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 149 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,042 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 100% copy Near-identical to another mod 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 $0.00149 $0.05042
Opus 5.5 $0.00060 $0.02017
Sonnet 5.5 $0.00030 $0.01008
Haiku 4.5 $0.00015 $0.00504

Measured 13d ago against content hash 0b077da6d772, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

self-managed-context 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 13d 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

This is a copy

100% identical to self-managed-context — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/self-managed-context/SKILL.md · 277 lines

How it starts

The opening of the file, as written. The whole thing — 277 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Self-Managed Context

This skill covers agents that manage their own context window: the model, not the harness, decides what stays in the live context, what is compacted, what is evicted, and what is rewritten in place. The reference implementation is Context Language Models (CLMs), which mirror the editable part of the conversation into a file that the model edits with ordinary code tools, then re-parse that file into the next prompt. Applied zero-shot to existing models on a shared agent backbone, this matched or beat harness-scheduled and action-based context management on accuracy and compute across deep-research, terminal-coding, and multi-hour repository-optimization tasks (claim-self-managed-context-zero-shot-results, claim-self-managed-context-long-horizon-results).

The controlling trade-off: model control buys adaptivity (verbatim retention, surgical in-place updates, eviction on demand) and creates three problems the harness must absorb. Edits break prefix caching, so a badly placed edit can cost more compute than the tokens it frees. Models do not know how full their context is. And a model-writable context is a persistence channel for whatever the model writes into it, including instructions. Most of this skill is the harness contract that makes the first property worth the other three.

When to Activate

Activate this skill when:

  • Giving a model write access to its own live context instead of compacting on a fixed schedule
  • Designing a context-as-a-file protocol: turn headers, parse-back, pinned prefix, edit receipts
  • An agent must keep exact values, update state in place, or evict offloaded material, and fixed summarization loses or duplicates it
  • Pricing mid-context edits under prefix caching, or evaluating suffix cache reuse
  • Budget readouts, tiered nudges, or rollback for an agent that times its own compaction
  • Steering, evolving, or training a model's context-editing strategy
  • Diagnosing a self-editing agent that never edits, wipes useful state, livelocks after overflow, or carries injected instructions in its own notes

Read the full file on GitHub · 277 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.

  1. 13d ago First seen · 277 lines · 149 tokens per session scan A 0b077da6d772

Subscribe to this mod's changes

self-managed-context is a skill published in the GitHub repository brake71/1c-ssl-skills (82 stars, last pushed 11d ago), licensed MIT. It adds 149 tokens to every session and 5,042 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to self-managed-context, differing in 0 lines, and is treated as a copy.