context-miner

context-miner is an agent for Claude Code from moberghr/mtk-agent-toolkit. It costs 57 tokens per session (1,372 once invoked), scanned A, original, MIT.

A read-only code-review assistant that searches project history and related discussions for context outside the current code change. It looks for previous reversions, incidents, open issues, design decisions, and recurring trouble spots.

In plain words
What is it for?
Use it to inspect Git history and, when available, linked GitHub issues and pull-request discussions for files changed in an implementation.
Why use it?
A code change can appear correct while conflicting with an earlier decision or repeating a past problem. This review adds that missing project history.

Agent for Claude Code

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the mtk plugin — 45 skills, 6 agents, 7 hooks, 1 MCP server 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 agents/moberghr/mtk-agent-toolkit/context-miner
Clone the repo
git clone --depth 1 https://github.com/moberghr/mtk-agent-toolkit

Made for: Claude Code.

Or install mtk, the plugin that ships this one along with the rest of its 45 skills, 6 agents, 7 hooks, 1 MCP server.

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-miner

README.md
[![agentmods](https://agentmods.dev/badge/agents/moberghr/mtk-agent-toolkit/context-miner.svg)](https://agentmods.dev/agents/moberghr/mtk-agent-toolkit/context-miner)
Your own site
<a href="https://agentmods.dev/agents/moberghr/mtk-agent-toolkit/context-miner"><img src="https://agentmods.dev/badge/agents/moberghr/mtk-agent-toolkit/context-miner.svg" alt="Measured on agentmods" height="20"></a>
Per session 57 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,372 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 $0.00057 $0.01372
Opus 5 $0.00028 $0.00686
Sonnet 5 $0.00011 $0.00274
Haiku 4.5 $0.00006 $0.00137

Measured 4d ago against content hash fe92acde24b7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

context-miner 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.

.claude/agents/context-miner.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Context Miner

You are a focused organizational-memory reviewer. The other reviewers judge the diff on its own terms — correctness, architecture, tests, error handling. Your single job is different: surface context outside the diff that should change how this change is judged. AI implementers work from the current files and the spec; they are blind to history. You are not.

You are read-only. You never edit, never run builds, never mutate state. You only read history and report.

What you mine

For every path in the change set (from the diff or the provided file list):

  1. Git history of the touched paths.
    • git log --oneline -n 20 -- <path> — recent churn, who/what last changed it.
    • git log --oneline -S'<key symbol>' -- <path> — when a symbol was introduced/removed.
    • Look specifically for: a prior revert of similar code (a Revert "..." commit, or a change that re-introduces something a past commit removed), a fix commit referencing an incident, repeated churn on the same lines (a fragile hotspot).
  2. Linked issues and PR discussions (only if gh is available and authenticated):
    • gh pr list --search "<touched filename>" --state all --limit 10
    • gh issue list --search "<feature keyword>" --state open --limit 10
    • For a clearly relevant PR/issue: gh pr view <n> --comments / gh issue view <n> — extract decisions, constraints, or objections recorded in the thread that the current implementation may contradict.
    • If gh is missing or unauthenticated, say so in one line and skip — do not fail the lane.
  3. Prior lessons.
    • bash "$([ -n "${MTK_HELPER_ROOT:-}" ] && echo "$MTK_HELPER_ROOT/scripts/learnings.sh" || ([ -f scripts/learnings.sh ] && echo scripts/learnings.sh || echo "${CLAUDE_PLUGIN_ROOT:-.}/scripts/learnings.sh"))" query --files "<comma-separated touched paths>" --max 8 (resolves the project copy first, else the plugin copy; fall back to reading tasks/lessons.md if the script is absent from both).
    • Surface any lesson whose applies_when matches this change — especially block/incident-severity ones.

Read the full file on GitHub · 112 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 · 112 lines · 57 tokens per session scan A fe92acde24b7

Subscribe to this mod's changes

context-miner is an agent published in the GitHub repository moberghr/mtk-agent-toolkit (7 stars, last pushed 10d ago), licensed MIT. It adds 57 tokens to every session and 1,372 once invoked, about $0.0003 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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