blackboard

blackboard is a skill for Claude Code from modeled-information-format/mnemonic. It costs 18 tokens per session (863 once invoked), scanned A, original, MIT.

A coordination skill for sharing persistent context between coding-agent sessions. It uses a blackboard, a shared handoff area, and memory files to record work and decisions.

In plain words
What is it for?
Use it to prepare session handoffs, share notes between agents, preserve project knowledge, and coordinate work across sessions.
Why use it?
It prevents important context from being lost when a session ends or different agents work on the same project.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions Claude Code.

Part of the mnemonic plugin — 10 skills, 14 commands, 4 agents, 1 hook shipped together

Good fit Use it to prepare session handoffs, share notes between agents, preserve project knowledge, and coordinate work across sessions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/modeled-information-format/mnemonic/blackboard
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 modeled-information-format/mnemonic --skill blackboard
Clone the repo
git clone --depth 1 https://github.com/modeled-information-format/mnemonic

Made for: Claude Code.

Or install mnemonic, the plugin that ships this one along with the rest of its 10 skills, 14 commands, 4 agents, 1 hook.

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 blackboard

README.md
[![agentmods](https://agentmods.dev/badge/skills/modeled-information-format/mnemonic/blackboard/github.svg)](https://agentmods.dev/skills/modeled-information-format/mnemonic/blackboard)
Your own site
<a href="https://agentmods.dev/skills/modeled-information-format/mnemonic/blackboard"><img src="https://agentmods.dev/badge/skills/modeled-information-format/mnemonic/blackboard/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 blackboard

Your own site · 80×15
<a href="https://agentmods.dev/skills/modeled-information-format/mnemonic/blackboard"><img src="https://agentmods.dev/badge/skills/modeled-information-format/mnemonic/blackboard.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 863 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00018 $0.00863
Opus 5.5 $0.00007 $0.00345
Sonnet 5.5 $0.00004 $0.00173
Haiku 4.5 $0.00002 $0.00086

Measured 1mo ago against content hash d9ee87e55521, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

blackboard 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.

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/blackboard/SKILL.md · 138 lines

How it starts

The opening of the file, as written. The whole thing — 138 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Memory

Search first: /mnemonic:search {relevant_keywords} Capture after: /mnemonic:capture {namespace} "{title}"

Run /mnemonic:list --namespaces to see available namespaces from loaded ontologies.

Mnemonic Blackboard Skill

Cross-session handoff, persistent context, and agent coordination.

Trigger Phrases

  • "blackboard", "cross-session", "session handoff", "shared context"

Coordination Overview

Scope Mechanism Tools
In-session Claude Code native swarm TeamCreate, SendMessage, TaskCreate, TaskUpdate
Cross-session Mnemonic blackboard handoff handoff/latest-handoff.md via hooks
Persistent knowledge Mnemonic memories *.memory.md files

Path Resolution

MNEMONIC_ROOT=$(tools/mnemonic-paths root)
BLACKBOARD=$(tools/mnemonic-paths blackboard)
HANDOFF_DIR=${BLACKBOARD}/handoff

Directory Structure

${BLACKBOARD}/
├── _legacy/                      # Pre-migration files (frozen)
├── sessions/
│   └── {session_id}/
│       ├── session-notes.md      # Session activity log
│       └── _meta.json            # Session lifecycle metadata
├── handoff/
│   ├── latest-handoff.md         # Cross-session context (overwritten each session end)
│   └── handoff-{session_id}.md   # Archived per-session handoffs
└── .archive/                     # Archived entries

Cross-Session Handoff

How It Works

  1. Session end (hooks/stop.py): Writes summary to handoff/latest-handoff.md
  2. Session start (hooks/session_start.py): Reads handoff/latest-handoff.md to restore context

This is automatic via hooks.

Handoff Format

# Session Handoff

**Session:** {session_id}
**Ended:** {timestamp}
**Project:** {org}/{project}

## What Was Accomplished
- Completed items

## In Progress
- Ongoing work with current state

## Blocked
- Blocker: reason

## Next Steps
- [ ] Action item 1
- [ ] Action item 2

## Important Context
- Key context for next session

Read the full file on GitHub · 138 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. 1mo ago First seen · 138 lines · 18 tokens per session scan A d9ee87e55521

Subscribe to this mod's changes

blackboard is a skill published in the GitHub repository modeled-information-format/mnemonic (23 stars, last pushed 10d ago), licensed MIT. It adds 18 tokens to every session and 863 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 2026-08-30.