Install Assertion Memory
Pick the tool you already use. It keeps what you decided and why, and brings it back in later sessions. Free for individual developers, including at work, and you sign in as part of the install.
/plugin marketplace add Assertion-AI/assertion
Install for Claude Code
In a terminal · one block to paste
Cursor
cd assertion/plugin/cursor && python3 install_cursor.py
Install for Cursor
In a terminal · one block to paste
Codex
python3 assertion/plugin/codex/install_codex.py
Install for Codex
A coding agent of its own, for the terminal or as a Mac app, with the same memory built in.
curl -sSL https://storage.googleapis.com/assertion-downloads/install.sh | sh
One memory across all of them. Shared spaces, where teammates recall each other's decisions, come with a Team seat.
“Our team works from one shared memory. When someone picks up our algorithm work, their coding agent already knows what everyone else has tried and why, so we build on each other's work instead of repeating it. Day to day, it's also made my LLM interactions more productive.”
“My architecture work needs to consider hundreds of components over long timelines. With Assertion, I spend less time assembling and maintaining context. It gives each new Claude Code session fast access to my whole history of decisions, without blowing the token budget.”
Measured on BEAM 100K, a public long-term memory benchmark
81.1%
overall score
Hindsight, the leading memory system: 77.9%
98.3%
summarizing many sessions
Hindsight: 78.3%
31% less
memory per question
12.2k tokens vs 17.7k
Same answer model and judge for both. Ahead in all three runs; every answer is published. See the benchmark →