Tessera

Persistent codebase memory for Claude Code — open source, no license gating.

Tessera gives Claude Code a semantic understanding of your project that persists across turns and sessions, eliminating redundant file re-reads and providing a structured action history.

How it works

1. tessera scan . — builds a SQLite graph of your codebase (files, symbols, imports)
2. Claude calls graph_continue every turn — routes to cached, scored file recommendations
3. graph_register_edit updates the graph after edits, auto-checks plan checklists
4. Optional: run tessera debate "task" for a Claude vs GPT multi-round planning debate

Installation

Claude Code plugin (recommended)

claude plugin marketplace add dr-code/tessera
claude plugin install tessera@tessera

This registers the MCP server (via uvx — no Python env needed) and auto-installs all skills (/build, /debate, /cleanup, /plan-review, /codex-review). Then in any project:

tessera scan .          # builds graph, writes .mcp.json and CLAUDE.md

pip (manual / CI)

curl -fsSL https://raw.githubusercontent.com/dr-code/tessera/main/install.sh | bash

When the claude CLI is present the script uses the plugin marketplace (registers the MCP server via uvx and installs all skills). Without it, it falls back to pip install tessera and offers to copy the skills to ~/.claude/skills/.

Then in any project:

tessera scan .          # builds graph, writes .mcp.json and CLAUDE.md

Manual alternatives

# Claude Code plugin (two steps)
claude plugin marketplace add dr-code/tessera
claude plugin install tessera@tessera

# pip only
pip install tessera          # core — no API keys needed
pip install tessera[debate]  # adds debate mode (requires ANTHROPIC_API_KEY + codex CLI)
pip install tessera[dashboard]
pip install tessera[all]

Quick start

cd my-project
tessera scan .          # builds graph, writes .mcp.json and CLAUDE.md
tessera status          # show graph stats
tessera dashboard       # start dashboard at localhost:5050

MCP registration

After tessera scan ., your project will have a .mcp.json:

{
  "mcpServers": {
    "tessera": {
      "command": "uvx",
      "args": ["--from", "tessera", "tessera", "mcp"],
      "env": { "TESSERA_PROJECT_ROOT": "/path/to/project" }
    }
  }
}

uvx fetches and caches tessera from PyPI on first run — no PATH entry needed. Claude Code picks this up automatically.

CLI reference

tessera scan [PATH]              Build/rebuild the graph
tessera mcp                      Start MCP server (stdio)
tessera status [PATH]            Show graph stats
tessera decisions [PATH]         List locked decisions
tessera reset [PATH]             Clear action graph
tessera plans [PROJECT [SUB]]    List archived plans
tessera verify [PATH]            Compliance: plan vs git diff
tessera handoff [PATH]           Generate clipboard handoff summary
tessera debate "task" [flags]    Run Claude vs GPT debate
tessera dashboard [PATH]         Start dashboard at localhost:5050

Debate mode

Requires pip install tessera[debate] and the codex CLI.

Connecting to ChatGPT (no API key needed)

If you have a ChatGPT Plus or Pro subscription you can authenticate the codex CLI with it — no separate API key or billing setup required:

npm install -g @openai/codex   # install once
codex auth login               # opens browser — sign in with your ChatGPT account

That's it. tessera debate and all Claude Code skills (/debate, /build, /cleanup, etc.) will use your subscription automatically.

Connecting via API key (optional)

Set OPENAI_API_KEY if you prefer direct API billing rather than the subscription OAuth path.

tessera debate "Add JWT authentication" \
  --project myapp \
  --subtask auth-middleware \
  --max-rounds 3

Feature flags

Flag	Default	Effect
TESSERA_ENABLE_DEBATE	on	Enables tessera debate
TESSERA_ENABLE_DASHBOARD	on	Enables tessera dashboard
TESSERA_ENABLE_COMPLIANCE	on	Enables tessera verify

Token savings target

Metric	Target
Turn 2+ read reduction	≥50% chars vs cold-start
10-turn session reduction	≥40% total chars
Cache hit rate (after turn 3)	≥60%
Symbol excerpt savings	≥70% vs full-file reads

Claude Code in-session skills

Tessera ships five Claude Code slash commands that use the tessera graph for context and Codex CLI for GPT's perspective. The plugin marketplace install auto-installs them from the skills/ directory in this repo. For manual install, run ./install.sh or copy from skills/ to ~/.claude/skills/.

Requires: codex CLI (npm install -g @openai/codex) authenticated via codex auth login (ChatGPT subscription) or OPENAI_API_KEY.

Skill	Usage	Description
/debate	/debate "REST vs GraphQL"	Multi-round Claude vs GPT debate on architecture or design decisions
/build	/build "add JWT auth"	Full build loop: GPT plans → debate → user approval → implement → GPT review
/cleanup	/cleanup src/	Bidirectional slop scanner — Claude + GPT independently analyze, then reconcile
/plan-review	/plan-review plan.md	Send an implementation plan to GPT for structured review before coding
/codex-review	/codex-review HEAD~2	Independent GPT code review of staged changes, commits, or files

All skills degrade gracefully when tessera MCP is not configured — they still run Claude+GPT collaboration, just without graph context.

License

MIT