yantrikdb

yantrikdb is a skill for Claude Code, Codex from yantrikos/yantrikdb-mcp. It costs 52 tokens per session (498 once invoked), scanned A, original, MIT.

A persistent memory service for AI agents. YantrikDB stores facts across sessions and agents, can search memories by meaning, and keeps a history when facts are corrected.

In plain words
What is it for?
Saving durable facts, recalling related information by meaning, correcting outdated beliefs, detecting contradictions, and building a knowledge graph across agent sessions.
Why use it?
Without persistent memory, an agent may lose useful context when a session ends or another agent takes over. This service provides a shared place to remember and recall information.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Saving durable facts, recalling related information by meaning, correcting outdated beliefs, detecting contradictions, and building a knowledge graph across agent sessions.

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Install with agentmods
npx agentmods add skills/yantrikos/yantrikdb-mcp/yantrikdb
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 yantrikos/yantrikdb-mcp --skill yantrikdb
Clone the repo
git clone --depth 1 https://github.com/yantrikos/yantrikdb-mcp

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 yantrikdb

README.md
[![agentmods](https://agentmods.dev/badge/skills/yantrikos/yantrikdb-mcp/yantrikdb/github.svg)](https://agentmods.dev/skills/yantrikos/yantrikdb-mcp/yantrikdb)
Your own site
<a href="https://agentmods.dev/skills/yantrikos/yantrikdb-mcp/yantrikdb"><img src="https://agentmods.dev/badge/skills/yantrikos/yantrikdb-mcp/yantrikdb/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 yantrikdb

Your own site · 80×15
<a href="https://agentmods.dev/skills/yantrikos/yantrikdb-mcp/yantrikdb"><img src="https://agentmods.dev/badge/skills/yantrikos/yantrikdb-mcp/yantrikdb.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 498 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 $0.00052 $0.00498
Opus 5 $0.00026 $0.00249
Sonnet 5 $0.00010 $0.00100
Haiku 4.5 $0.00005 $0.00050

Measured 12d ago against content hash 455172056f49, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

yantrikdb 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 (src/yantrikdb/__init__.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.

integrations/prime-agent/yantrikdb/SKILL.md · 51 lines

What it actually says

YantrikDB — persistent memory

Talk to a YantrikDB memory server from the IPython kernel. Memory persists across sessions and across harnesses: what you remember here, a future session — or a different agent pointed at the same database — can recall.

Setup

Requires a running yantrikdb-mcp server on the streamable-http transport:

YANTRIKDB_API_KEY=<your-token> yantrikdb-mcp --transport streamable-http --host 127.0.0.1 --port 8420

and the same YANTRIKDB_API_KEY value in Prime Agent's environment. The server URL defaults to http://127.0.0.1:8420/mcp; override it with a yantrikdb entry under mcpServers in ~/.prime/agent/settings.json.

Usage

Discover before you call — the server defines the tool set:

import yantrikdb

for tool in await yantrikdb.list_tools():
    print(tool["name"], "-", tool["description"])

# Store a durable fact
await yantrikdb.remember(text="User prefers dark mode in the editor", importance=0.7)

# Retrieve by meaning, not keywords
hits = await yantrikdb.recall(query="what editor settings does the user like")
print(hits)

# Revise a fact without losing history (do NOT remember a contradiction)
await yantrikdb.correct(query="editor preference", new_text="User switched to light mode", reason="user said so")

Notes:

  • Every tool is an async method — always await.
  • Results are already-parsed Python (a dict for structured output, otherwise a string).
  • Escape hatch for non-identifier tool names: await yantrikdb.call_tool("name", {...}).
  • If a call raises NotEnabled, the YANTRIKDB_API_KEY environment variable is not visible to Prime Agent — set it in the shell that launches the agent.
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. 12d ago First seen · 51 lines · 52 tokens per session scan A 455172056f49

Subscribe to this mod's changes

yantrikdb is a skill published in the GitHub repository yantrikos/yantrikdb-mcp (24 stars, last pushed today), licensed MIT. It adds 52 tokens to every session and 498 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 2026-08-30.