context-builder

context-builder is a skill for Claude Code, Codex from Adit-Jain-srm/skill-forge. It costs 105 tokens per session (1,075 once invoked), scanned A, original, MIT.

A guided tool that interviews you about a project's terminology and creates a CONTEXT.md glossary for the coding agent.

In plain words
What is it for?
Use it when starting or onboarding to a project, especially when domain terms, relationships, or confusing wording need to be documented.
Why use it?
It gives the agent shared definitions and preferred names, reducing repeated explanations and vague naming across sessions.

Skill for Claude CodeCodex

Part of the skill-forge plugin — 19 skills shipped together

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/adit-jain-srm/skill-forge/context-builder
Any agent
npx skills add Adit-Jain-srm/skill-forge --skill context-builder
Clone the repo
git clone --depth 1 https://github.com/Adit-Jain-srm/skill-forge

Made for: Claude Code, Codex.

Or install skill-forge, the plugin that ships this one along with the rest of its 19 skills.

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 context-builder

README.md
[![agentmods](https://agentmods.dev/badge/skills/adit-jain-srm/skill-forge/context-builder.svg)](https://agentmods.dev/skills/adit-jain-srm/skill-forge/context-builder)
Your own site
<a href="https://agentmods.dev/skills/adit-jain-srm/skill-forge/context-builder"><img src="https://agentmods.dev/badge/skills/adit-jain-srm/skill-forge/context-builder.svg" alt="Measured on agentmods" height="20"></a>
Per session 105 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,075 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 $0.00105 $0.01075
Opus 5 $0.00053 $0.00537
Sonnet 5 $0.00021 $0.00215
Haiku 4.5 $0.00011 $0.00108

Measured 4d ago against content hash 381ee48122ee, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

context-builder 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 4d 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.

skills/context-builder/SKILL.md · 127 lines

How it starts

The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Context Builder

Overview

Create a shared vocabulary between you and the agent. Once built, the agent speaks YOUR language — concise, precise, domain-native.

The Problem This Solves

Without shared context:

  • Agent uses 20 words where your domain has 1 term
  • Variables named generically ("data", "handler", "service") instead of domain terms
  • Every session starts from scratch explaining the same concepts
  • Conversations are verbose because the agent doesn't know your jargon

With CONTEXT.md:

  • Agent speaks your domain language natively
  • "the materialization cascade" replaces "when a lesson inside a section of a course is made real"
  • Code uses domain terms for variables, functions, modules
  • Sessions start with shared understanding already loaded

Process

1. Interview (grill the user)

Ask these questions ONE AT A TIME:

  1. "What is this project? One sentence."
  2. "What are the 3-5 most important CONCEPTS in this domain?"
  3. For each concept: "Define it in one sentence. What terms should I AVOID using for this?"
  4. "Are there relationships between these concepts? (X contains many Y, Y belongs to one X)"
  5. "Any terms that were previously confusing or ambiguous? What did you resolve them to?"
  6. "What actions/verbs are specific to this domain?" (e.g., "materialize", "triage", "hydrate")

2. Generate CONTEXT.md

Write to the project root:

# [Project Name]

[One-sentence description]

## Language

**[Term 1]**:
[Definition in one sentence]
_Avoid_: [terms NOT to use for this concept]

**[Term 2]**:
[Definition]
_Avoid_: [alternatives to avoid]

## Relationships

- A **[Term 1]** contains many **[Term 2]**s
- A **[Term 2]** belongs to one **[Term 1]**

## Flagged Ambiguities

- "[confusing term]" was previously used for both X and Y — resolved: [how it's now used]

3. Persistence

Once CONTEXT.md exists:

  • Agent reads it at session start
  • Uses defined terms in ALL communication
  • Names variables/functions using the vocabulary
  • Flags when new undefined terms appear: "Should I add '[term]' to CONTEXT.md?"

Read the full file on GitHub · 127 lines

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. 4d ago First seen · 127 lines · 105 tokens per session scan A 381ee48122ee

Subscribe to this mod's changes

context-builder is a skill published in the GitHub repository Adit-Jain-srm/skill-forge (2 stars, last pushed 2mo ago), licensed MIT. It adds 105 tokens to every session and 1,075 once invoked, about $0.0005 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.

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