Three MCP servers that plug into Claude Desktop, Claude Code, Cursor and Codex in one line. Free to run, forever. The v2 line is what teams pay for when they run it every day.
Tamper-evident local memory. Your AI writes what it did and reads it back next session; every record is hash-chained, so a silent rewrite fails verification.
pip install arkhive-mcp
Tools: birth · remember · recall · verify · govern
Fan a goal out to cheap parallel workers on your own key, or on a free local Ollama it detects automatically. The expensive mind stops doing the grunt work.
pip install algernon-mcp
Tools: algernon_doctor · plan · dispatch · orchestrate
{ "mcpServers": {
"sentarion": { "command": "sentarion", "env": { "ANTHROPIC_API_KEY": "sk-ant-..." } },
"arkhive": { "command": "arkhive-mcp" },
"algernon": { "command": "algernon-mcp" }
} }
No key? Leave it out. Algernon and Sentarion use your local Ollama when one is running. Hosted, no install: https://arkhive.dondatabrain.com/mcp and https://arkhive.dondatabrain.com/sentarion/mcp.
Everything in the free line stays free. v2 is what you lose if you stop paying: real capability, not a lock.
| You need to… | Free 0.x | v2 |
|---|---|---|
| Start a session already knowing what happened | page through recall | context_pack: one call, fits your token budget |
| Find the record about the nginx deploy from last month | last N rows only | full-text search, actor/kind/tag/time filters, paging |
| Keep client A's memory away from client B | one global chain | spaces per project/tenant; hosted keys pinned to a space |
| Prove nothing was altered, fast | re-hash everything | incremental + Ed25519-signed verify that names the bad block |
| Stop the agent before it emails a customer list | only flags you remembered to declare | inferred risk flags (PII, credentials, money, irreversible, outbound, bulk) + stored policies + REVIEW verdict |
| Run 40 sub-tasks without the tool call dying | dies at ~120 s | progress notifications + background jobs |
| Cap spend and never pay twice | — | budget_usd, token caps, result cache, retries |
| Feed task B the output of task A | ordering only | {{id}} data flow between tasks |
| Prove what the fleet actually did | goal string logged | signed manifest: prompt/result hashes, usage, cost |
| Review a diff adversarially before merging | — | multi-agent review: finders per dimension, skeptics refute |
| Let the fleet edit code safely | worktree create/remove | sandbox: create · diff · apply_patch · commit |
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