Install
$ agentstack add mcp-magna-nz-tallybook ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Tallybook Prices every Claude Code and Codex session on your disk, shows what each agent cost over any period, and tells you in plain English what would have been cheaper.
Documentation
No proxy, no API key, nothing leaves your machine. Run it as a CLI, open the same report in your browser with tallybook --serve, or add tallybook-mcp to Claude Code or Codex and ask the agent itself what it's spending and what would be cheaper.
In your browser · tallybook --serve
In your terminal · tallybook
More in the documentation.
Install
brew install --cask magna-nz/tap/tallybook
Also available via go install github.com/magna-nz/tallybook/cmd/tallybook@latest, or as a release download. Works on macOS, Linux and Windows.
Add the MCP server so your agent can check its own spend mid-session — tallybook-mcp ships alongside tallybook, so no separate install:
claude mcp add tallybook -- tallybook-mcp # Claude Code
For Codex, add it to ~/.codex/config.toml:
[mcp_servers.tallybook]
command = "tallybook-mcp"
Use
tallybook # this period's report: the five biggest findings
tallybook --serve # the same report, findings and sessions in your browser, on localhost
tallybook findings # every finding, grouped by what kind of change it asks for
tallybook --since 7d --compare # this week against last week: spend, sessions, cache hit rate
tallybook finding 1 # finding #1 in full: what happened, why, what to change
tallybook finding 1 --evidence # the same, with the sessions behind it
tallybook finding 1 --patch # finding #1's fix, as an applyable diff
tallybook agents # spend by sub-agent type, with the model and effort each ran at
tallybook sessions --sort cost # sessions ranked by what they cost
tallybook changes # did a past model swap actually save money?
tallybook setup hook # record sessions automatically as they end
Docs
The command reference, the MCP server's tools, configuration, and the privacy model live on the documentation site.
License
MIT
Source & license
This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: magna-nz
- Source: magna-nz/tallybook
- License: MIT
- Homepage: https://github.com/magna-nz/tallybook#readme
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.