Tokensave— agent skill

<p align="center"> <img src="src/resources/logo.png" alt="TokenSave" width="300"> </p>

<h3 align="center">Semantic Code Intelligence for AI Coding Agents</h3>

<p align="center"><strong>Fewer tokens &bull; Fewer tool calls &bull; 100% local</strong></p>

<p align="center"> <a href="https://crates.io/crates/tokensave"><img src="https://img.shields.io/crates/v/tokensave.svg" alt="crates.io"></a> <a href="https://opensource.org/licenses/MIT"><img src="https://img.shields.io/badge/License-MIT-yellow.svg" alt="License: MIT"></a> <a href="https://www.rust-lang.org/"><img src="https://img.shields.io/badge/Rust-1.70+-orange.svg" alt="Rust"></a> </p>

<p align="center"> <img src="https://img.shields.io/badge/macOS-supported-blue.svg" alt="macOS"> <img src="https://img.shields.io/badge/Linux-supported-blue.svg" alt="Linux"> <img src="https://img.shields.io/badge/Windows-supported-blue.svg" alt="Windows"> <a href="https://hypercommit.com/tokensave"><img src="https://img.shields.io/badge/Hypercommit-DB2475" alt="Hypercommit"></a> </p>

Why tokensave?

AI coding agents waste tokens exploring codebases. Every grep, glob, and file read costs money. On complex tasks, agents spawn multiple Explore sub-agents that scan hundreds of files just to build context.

tokensave gives agents a pre-indexed semantic knowledge graph. Instead of scanning files, the agent queries the graph and gets instant, structured answers -- the right symbols, their relationships, and source code, in one call.

How It Works

┌──────────────────────────────────────────────────────────────┐
│  AI Coding Agent (Claude Code, Codex, Gemini, Cursor, ...)   │
│                                                              │
│  "Implement user authentication"                             │
│        │                                                     │
│        ▼                                                     │
│  ┌─────────────────┐       ┌─────────────────┐               │
│  │  Sub-agent      │ ───── │  Sub-agent      │               │
│  └────────┬────────┘       └─────────┬───────┘               │
└───────────┼──────────────────────────┼───────────────────────┘
            │                          │
            ▼                          ▼
┌──────────────────────────────────────────────────────────────┐
│  tokensave MCP Server                                        │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐           │
│  │   Search    │  │   Callers   │  │   Context   │           │
│  │   "auth"    │  │  "login()"  │  │   for task  │           │
│  └──────┬──────┘  └──────┬──────┘  └──────┬──────┘           │
│         └────────────────┼────────────────┘                  │
│                          ▼                                   │
│              ┌───────────────────────┐                       │
│              │   libSQL Graph DB     │                       │
│              │   • Instant lookups   │                       │
│              │   • FTS5 search       │                       │
│              └───────────────────────┘                       │
└──────────────────────────────────────────────────────────────┘

Without tokensave: Agents use grep, glob, and Read to scan files -- many API calls, high token usage.

With tokensave: Agents query the graph via MCP tools -- instant results, local processing, fewer tokens.

Key Features

Quick Start

1. Install

Homebrew (macOS):

brew install aovestdipaperino/tap/tokensave

Scoop (Windows):

scoop bucket add tokensave https://github.com/aovestdipaperino/scoop-bucket
scoop install tokensave

Cargo (any platform):

cargo install tokensave                          # full (50+ languages, default)
cargo install tokensave --features medium        # medium tier
cargo install tokensave --no-default-features    # lite (smallest binary)

Prebuilt binaries (Linux, Windows, macOS):

Download from the latest release and place the binary in your PATH.

2. Configure your agent

tokensave install                         # auto-detects installed agents
tokensave install --agent antigravity     # Google Antigravity (formerly Windsurf)
tokensave install --agent claude          # Claude Code
tokensave install --agent cline           # Cline
tokensave install --agent codex           # OpenAI Codex CLI
tokensave install --agent copilot         # GitHub Copilot
tokensave install --agent cursor          # Cursor
tokensave install --agent gemini          # Gemini CLI
tokensave install --agent kilo            # Kilo CLI
tokensave install --agent kiro            # AWS Kiro
tokensave install --agent kimi            # Moonshot Kimi CLI
tokensave install --agent opencode        # OpenCode
tokensave install --agent pi              # Pi (pi.dev)
tokensave install --agent roo-code        # Roo Code
tokensave install --agent vibe            # Mistral Vibe
tokensave install --agent zed             # Zed
tokensave install --agent grok            # Grok Build (xAI)
tokensave install --git-hook yes           # auto-install the global post-commit and post-checkout hooks (no prompt)
tokensave install --git-hook no            # skip the post-commit and post-checkout hooks (no prompt)

Each agent gets its MCP server registered in the native config format. Claude Code additionally gets a PreToolUse hook (blocks wasteful Explore agents), a UserPromptSubmit hook, a Stop hook, prompt rules in CLAUDE.md, and auto-allowed tool permissions. Kiro gets global MCP config, tokensave.md steering loaded as a resource, and a tokensave-managed default agent with permissive built-in/tokensave tool approval, delegation guardrail hooks, and post-write sync; user-managed Kiro agents are preserved.

All changes are idempotent -- safe to run again after upgrading. After agent setup, you'll be offered global git post-commit and post-checkout hooks.

Project-local install

By default tokensave install registers the MCP server in your global agent config (e.g. ~/.claude.json). To register tokensave for just the current project instead, add --local:

tokensave install --local --agent claude

This writes project-scoped config you can commit and share with your team. For Claude that's ./.mcp.json, ./.claude/settings.json, and ./CLAUDE.md. Supported agents: claude, cursor, gemini, zed, opencode, roo-code, kiro (each writes its own project file, e.g. .cursor/mcp.json, .gemini/settings.json, .zed/settings.json, opencode.json, .roo/mcp.json, .kiro/settings/mcp.json). Other agents have no project-scoped config and report an error with --local.

Remove a project-local install with tokensave uninstall --local.

3. Index your project

cd /path/to/your/project
tokensave init

This creates a .tokensave/ directory with the knowledge graph database. Initialization and sync are separate commands: init is a one-time opt-in per project, while sync only updates projects that were already initialized. This prevents the global git hooks from silently creating databases in repos you never intended to index. After init, use tokensave sync to incrementally update -- only changed files are re-indexed.

<details> <summary><strong>What install writes for Claude Code</strong></summary>

#### MCP server

{
  "mcpServers": {
    "tokensave": {
      "command": "/path/to/tokensave",
      "args": ["serve"]
    }
  }
}

#### PreToolUse hook

The hook runs tokensave hook-pre-tool-use -- a native Rust command (no bash or jq required). It intercepts Agent, Grep, and Bash tool calls: Explore agents are blocked outright, and symbol-shaped grep/rg/ag invocations (plain identifiers, alternations, \b-wrapped names) are redirected to the matching tokensave MCP tool. Regex patterns, file-discovery modes, git grep, and piped commands pass through untouched; set TOKENSAVE_DISABLE_GREP_HOOK=1 to opt out per shell.

#### CLAUDE.md rules

Appends instructions to ~/.claude/CLAUDE.md that tell Claude to use tokensave tools before reaching for Explore agents or raw file reads.

</details>

Crash-Resilient Sync

Tree-sitter grammars are compiled C/C++ code. They occasionally hit an internal assertion or otherwise terminate the process by paths that Rust panic handling cannot intercept. As of v4.3.0, every file is parsed inside a short-lived worker subprocess: if a grammar segfaults, calls abort(), or hits a stack overflow, only the worker dies. The pool respawns it, the offending file is logged and skipped, and sync keeps going.

The worker is a hidden extract-worker subcommand authenticated against the parent via a 256-bit per-spawn token, required as both a TOKENSAVE_WORKER_TOKEN env var and as the first 32 bytes received on stdin. Direct invocation by users fails. Defaults to available_parallelism() workers; opt out with TOKENSAVE_DISABLE_SUBPROCESS=1.

Edit primitives (tokensave_str_replace, tokensave_insert_at, etc.) still run in-process: they target one file at a time where subprocess overhead would dominate, and an extractor crash there is immediately visible to the agent.

Multi-Branch Indexing (Optional)

tokensave can optionally maintain a separate code graph per git branch. When enabled, switching branches never gives you stale results and never re-indexes files you already parsed on another branch. Multi-branch tracking is opt-in -- without it, tokensave uses a single database for all branches.

How it works

When you track a branch, tokensave copies the nearest ancestor DB and syncs only the files that differ. This means tracking a feature branch off main is nearly instant -- it only parses the files you've changed.

CLI commands

tokensave branch add              # track the current branch
tokensave branch list             # see tracked branches and DB sizes
tokensave branch remove <name>    # stop tracking a branch
tokensave branch removeall        # remove all tracked branches except default
tokensave branch gc               # clean up branches deleted from git

Cross-branch MCP tools

Three MCP tools enable cross-branch queries without switching your checkout:

• `tokensave_branch_search` -- search symbols in another branch's graph
• `tokensave_branch_diff` -- compare code graphs between two branches: symbols added, removed, and changed (signature differs). Supports file and kind filters.
• `tokensave_branch_list` -- list tracked branches with DB sizes, parent branch, and sync times

Branch fallback

When the MCP server can't find a database for the current branch, it serves from the nearest ancestor branch's DB and includes a warning in every tool response suggesting you run tokensave branch add.

See docs/BRANCHING-USER-GUIDE.md for the full guide.

Cross-Session Memory

Three MCP tools persist decisions and code-area context across sessions, stored in the per-project .tokensave/tokensave.db.

Use these so the agent doesn't have to re-explain architecture choices session-to-session.

Savings Ledger

Every MCP call writes an append-only row to ~/.tokensave/global.db (savings_ledger table). Inspect with tokensave gain:

tokensave gain                    # current project, last 30 days
tokensave gain --all              # all projects
tokensave gain --history --range 7d
tokensave gain --json

Dollar estimates use the existing pricing module (Sonnet input pricing, refreshed daily via LiteLLM).

Reproducible Benchmark

tokensave bench runs a fixed query set through tokensave_context and reports retrieval savings vs a full-file baseline (mirrors the CCE methodology):

tokensave bench                                    # ships with 10 default queries
tokensave bench --queries my-queries.toml --json
tokensave bench --max-nodes 5

Measured against this repo (`tokensave` itself) using the shipped generic query set:

Aggregate: 93% mean retrieval savings (180,396 → 3,384 tokens across 10 queries).

The default query set targets patterns present in most application codebases (CLIs, daemons, services). Run it on your own project with tokensave bench to see your numbers, or write a tailored query file (--queries my.toml) for tighter recall.

Criterion bench against large real-world repos

benches/large_repos.rs is a criterion micro-benchmark that exercises the MCP tools end-to-end against four large open-source codebases pinned at constant refs. Each tool is driven by at least 5 queries with arguments (node ids, qualified names, file globs, …) sampled from the indexed graph once per repo, so timings are reproducible across runs.

Repos and pinned refs (defined in benches/repos.rs):

Each repo is shallow-cloned (git init + git fetch --progress --depth 1 origin <ref> + checkout FETCH_HEAD) on first use and cached locally; subsequent runs reuse the checkout. Git output is streamed to the terminal so the multi-GB fetch shows real-time progress.

Tools covered (5 queries each). Read tools — search, context, callers, callees, node, by_qualified_name, signature, impact, body, files, complexity, doc_coverage, largest, hotspots, god_class, module_api, derives, dead_code, rank, coupling, circular. Write tools — str_replace, multi_str_replace, insert_at, and (if ast-grep is on PATH) ast_grep_rewrite.

Force-sync on every run. Before any benchmark fires, the harness runs the equivalent of tokensave sync --force on each repo (index_all() regardless of .tokensave/ freshness) so timings always reflect the pinned source.

Write benches and cleanup. Write tools mutate files. To keep the "match must be unique" precondition holding, the harness uses criterion's iter_batched — a small scratch file under <repo>/.tokensave-bench-scratch/ is rewritten with known content before every timed iteration, then the edit tool runs against it. After all benchmarks finish, the harness runs git stash --include-untracked && git stash drop inside every prepared repo so the working tree returns to the pinned ref.

Criterion configuration. The bench overrides criterion's defaults to sample_size = 10 and measurement_time = 30s (vs the stock 100 / 5s), which gives each per-query timing ~30 seconds of measurement — enough that slow tools like tokensave_context on polkadot-sdk produce stable numbers.

Run it:

# Required: a writable cache directory for the cloned repos + their indexes.
# Expect several GB of disk and a long first run (shallow clone + full index of each repo).
export TOKENSAVE_BENCH_REPOS_DIR=~/tokensave-bench-cache

cargo bench --bench large_repos

If TOKENSAVE_BENCH_REPOS_DIR is unset the bench prints a notice and registers zero benchmarks (so cargo bench --all stays cheap on contributors' machines).

Configuration (all optional, via environment):

Filtering benchmarks uses the standard criterion CLI — for example, only the search tool on scipy:

cargo bench --bench large_repos -- 'scipy/tokensave_search'

Reports (HTML + raw samples) land under target/criterion/.

To change the pinned refs (e.g. to a newer release or a specific SHA), edit REPOS in benches/repos.rs and delete the corresponding $TOKENSAVE_BENCH_REPOS_DIR/<repo>/.bench-ref marker so the next run re-fetches. If you skip the post-run cleanup (e.g. you Ctrl-C mid-bench), running git stash --include-untracked && git stash drop inside each repo dir restores it manually.

MCP test-matrix probe (scripts/mcp_probe)

scripts/mcp_probe/ is a Python harness that drives tokensave serve over stdio against a configurable set of real repos and exercises every read-only MCP tool with 5 query variants per language, producing a per-tool / per-repo status table. Same harness serves two purposes:

• Regression sweep. New language support, new tool, or a refactor — re-run the matrix and any cell that newly errors, times out, or returns empty results stands out as a 🚩.
• Perf probe. Per-call timings are logged in TSV; the same fixed corpus of repos doubles as a coarse cross-version comparison. The current tokensave_inheritance_depth cycle bug was found by this harness when a single tool on polkadot-sdk timed out at >60 s.

Layout — probe.py is the driver (id-matched JSON-RPC so a slow tool can't poison subsequent calls), isolated.py re-runs a single tool with a fresh server per call (escapes server queueing), build_matrix.py reads the TSV and emits markdown, tools/<lang>.py modules contribute per-language query sets (Rust shipped; add Python/Go/… by dropping a new module), repos.toml lists target repos (override via $TOKENSAVE_PROBE_REPOS).

Quick run:

cargo build --release --bin tokensave
python3 scripts/mcp_probe/probe.py
python3 scripts/mcp_probe/build_matrix.py > matrix.md

Output cells are ✓ 5/5 (clean), 🐛 e/N (errors), ⏱ N/N (timeouts), ∅ E/N (empty), 🐢 ok/slow (>10 s calls). Any cell carrying an error or timeout earns a 🚩 in the rightmost column. Per-call detail with the first 100 chars of each error landS in the TSV log for follow-up.

Different from the criterion bench above: criterion measures per-iteration latency for a focused tool set on pinned refs and produces statistical reports under target/criterion/; mcp_probe exercises every tool with a broader query set on whatever repos you point it at, optimising for breadth of coverage rather than measurement precision.

80+ MCP Tools

The server exposes more than 80 tools (one fewer when the optional ast-grep binary is not on PATH); the tables below group the most commonly used ones by category. Most are read-only, safe to call in parallel, and annotated with readOnlyHint. The edit primitives are scoped to single files and re-index in place; session baseline and memory-recording tools also mutate local .tokensave state and are annotated as non-read-only. The three core tools (tokensave_context, tokensave_search, tokensave_status) are marked anthropic/alwaysLoad so they bypass the client's tool-search round-trip.

Discovery

Call Graph & Impact

Code Quality

Code-Health Analytics

Five tools surface structural quality signals from the existing graph. The composite score uses a geometric mean over independent dimensions so no single one can be gamed.

Sessions

Snapshot health metrics at the start of an AI coding session, then diff at the end to see what improved or regressed.

Edit Primitives

Four writer tools that let agents modify files without regex or shell-quoting hazards. Each is single-file, anchored, and triggers an in-place re-index after writing so the graph never goes stale.

Git & Workflow

Type System

Porting

Multi-Branch

MCP Resources

Four resources are exposed via resources/list and resources/read:

• tokensave://status -- graph statistics as JSON
• tokensave://files -- indexed file tree grouped by directory
• tokensave://overview -- project summary with language distribution and symbol kinds
• tokensave://branches -- tracked branches with DB sizes and parent info

Token Tracking

tokensave measures the tokens it saves on every MCP tool call. Each tool response includes a tokensave_metrics: before=N after=M line showing how many raw-file tokens were avoided by that specific call.

Cost observability

tokensave cost                     # 7-day cost summary (default)
tokensave cost today               # today only
tokensave cost --by-model          # breakdown by Claude model
tokensave cost --by-task           # breakdown by task category (coding, debugging, exploration, ...)
tokensave cost --export json       # JSON export to stdout
tokensave cost --export csv        # CSV export to stdout

Parses Claude Code session transcripts (~/.claude/projects/**/*.jsonl), classifies each API turn into one of 13 task categories, computes dollar cost using model pricing, and stores results in ~/.tokensave/global.db for fast aggregate queries. Pricing is refreshed from LiteLLM every 24 hours and falls back to an embedded table when offline.

The tokensave status header includes a cost row showing today's spend, 7-day total, and efficiency ratio (tokens saved / total tokens). The tokensave monitor TUI shows a live cost panel alongside the savings feed. At the end of each Claude Code session, the hook_stop handler prints a one-line receipt to the terminal.

Task classification categories: Coding, Debugging, Feature Dev, Refactoring, Testing, Exploration, Planning, Delegation, Git Ops, Build/Deploy, Brainstorming, Conversation, General. Classification is deterministic (pattern matching on tool names and Bash commands), requires no LLM calls, and is adapted from AgentSeal/codeburn.

Live monitor

tokensave monitor

A global TUI that shows MCP tool calls from all projects in real time, via a shared memory-mapped ring buffer at ~/.tokensave/monitor.mmap. Each entry shows the project name, tool name, and token delta. A cost panel at the top shows today's spend, savings, efficiency, and top model (refreshed every 30 seconds).

Session and lifetime counters

tokensave current-counter          # show per-project session counter
tokensave reset-counter            # reset the session counter
tokensave status                   # shows project + global lifetime totals + cost

Worldwide counter

All tokensave users contribute to an anonymous aggregate counter. tokensave status shows both your project total and the worldwide total. The upload sends only a single number (e.g. 4823) with no identifying information. Opt out with tokensave disable-upload-counter.

Index Freshness

tokensave keeps the graph up to date without a background daemon or an OS-level file watcher.

On-demand staleness check. Every MCP tool call checks whether any indexed files have been modified since the last sync. If stale files are found, they are re-extracted before the tool response is returned. A 30-second cooldown prevents back-to-back calls from re-walking the tree on every keystroke.

Catch-up sync on connect. When the MCP server starts, it immediately runs a non-blocking catch-up sync that picks up any changes made while no agent was attached — a git pull, an IDE edit, a build step — so the very first tool call of a session sees a fresh index.

Multi-agent work and git worktrees. When multiple agents work on the same project concurrently, the strong assumption is that each agent operates in its own git worktree. Worktrees are independent filesystem checkouts of the same repository: agent A and agent B each have their own copy of every file, so they never overwrite each other's in-flight edits. tokensave automatically detects when a query comes from a worktree nested inside the main checkout and serves results from the correct branch graph. Changes accumulate independently and are eventually reconciled via git merge or rebase — the same process used for any other parallel development. This design avoids the complexity and failure modes of cross-agent locking over a shared mutable directory.

CLI-only workflows. If you run tokensave commands without an attached agent (no MCP server), the staleness check is not running between commands. Install git hooks to keep the index fresh automatically after every commit or clone:

cp scripts/post-commit scripts/post-checkout .git/hooks/
chmod +x .git/hooks/post-commit .git/hooks/post-checkout

Upgrading from 5.x

The standalone tokensave daemon command and its launchd/systemd/Windows Service autostart were removed in 6.0.0. The embedded OS-level file watcher that replaced the daemon was itself removed in 6.1.0 (it caused runaway CPU and memory on large monorepos with deep node_modules or target trees). The on-demand staleness model above is the current design.

If you still have a daemon autostart from 5.x, remove it:

• macOS: launchctl unload ~/Library/LaunchAgents/com.tokensave.daemon.plist && rm ~/Library/LaunchAgents/com.tokensave.daemon.plist
• Linux: systemctl --user disable --now tokensave-daemon && rm ~/.config/systemd/user/tokensave-daemon.service
• Windows: sc.exe delete tokensave-daemon (from an elevated terminal)

If you don't recall the exact name: launchctl list | grep tokensave / systemctl --user list-units | grep tokensave / sc.exe query state= all | findstr -i tokensave.

Self-Upgrade

tokensave upgrade                  # upgrade to latest in current channel
tokensave channel                  # show current channel (stable/beta)
tokensave channel beta             # switch to beta channel
tokensave channel stable           # switch back to stable

tokensave upgrade downloads the correct platform binary from GitHub releases and replaces the running binary in place. Supports stable and beta channels independently.

Versioning & upgrades

tokensave follows Semantic Versioning, and the version component that changes determines what maintenance runs automatically on the next launch — you never run a reinstall or reindex by hand.

Global reinstall. On the first run of a new minor or major build, tokensave silently re-runs install for each agent it has registered, so the agent config always points at the current binary and exposes the current tool set. Patch bumps skip this — the running version marker is simply advanced.

Per-project forced reindex (major only). A major bump can change the on-disk schema, so each project's index must be rebuilt to backfill the new columns. tokensave does this lazily and per project: on the first MCP tool call in a project after a major upgrade, it spawns a background full reindex (equivalent to tokensave sync --force). The reindex never blocks the tool response; when it finishes, the project records the version that indexed it. A project that has never recorded a version (created before this mechanism existed) is treated as needing the reindex, as is any project whose DB schema is older than the running build's latest schema.

Brew / cargo fallback. External upgrades that replace the binary outside of tokensave upgrade — brew upgrade tokensave or cargo install tokensave — are detected the same way: if the running version is newer than the last version that performed an install, the global reinstall (and, for a major bump, the per-project reindex) runs on the next launch just as it would after a self-upgrade.

CLI Reference

tokensave init [path]              # Initialize a new project (full index)
tokensave sync [path]              # Incremental sync (must be initialized first)
tokensave sync --force [path]      # Force a full re-index
tokensave sync --doctor [path]     # Sync and list added/modified/removed files
tokensave status [path]            # Show statistics + cost summary
tokensave status [path] --json     # Show statistics (JSON output)
tokensave status --details         # Include node-kind breakdown
tokensave cost [range]             # Token cost summary (default: 7d)
tokensave cost --by-model          # Cost grouped by model
tokensave cost --by-task           # Cost grouped by task category
tokensave cost --export json|csv   # Export cost data
tokensave query <search> [path]    # Search symbols
tokensave files [--filter dir] [--pattern glob] [--json]   # List indexed files
tokensave affected <files...> [--stdin] [--depth N]        # Find affected test files
tokensave install [--agent NAME]   # Configure agent integration
tokensave reinstall                # Refresh settings for all installed agents
tokensave uninstall [--agent NAME] # Remove agent integration
tokensave serve                    # Start MCP server
tokensave monitor                  # Live TUI showing MCP calls across all projects
tokensave upgrade                  # Self-update to latest version
tokensave channel [stable|beta]    # Show or switch update channel
tokensave doctor [--agent NAME]    # Check installation health
tokensave branch add|list|remove|removeall|gc   # Multi-branch management
tokensave current-counter          # Show per-project token counter
tokensave reset-counter            # Reset per-project token counter
tokensave disable-upload-counter   # Opt out of worldwide counter uploads
tokensave enable-upload-counter    # Re-enable worldwide counter uploads

tokensave doctor

Run a comprehensive health check of your tokensave installation:

tokensave doctor

Checks: binary location, project index, global DB, user config, agent integration (MCP server, hooks, permissions, prompt rules), and network connectivity. If any tool permissions are missing after an upgrade, it tells you to run tokensave install. Use --agent to check a specific agent only.

Doctor also validates that each installed hook uses the correct tokensave subcommand and auto-repairs broken hooks.

How It Works with Claude Code

Once configured, Claude Code automatically uses tokensave instead of reading raw files when it needs to understand your codebase. Three layers reinforce each other:

The result: Claude gets the same code understanding with far fewer tokens. A typical Explore agent reads 20-50 files; tokensave returns the relevant symbols, relationships, and code snippets from its pre-built index.

Network Calls & Privacy

tokensave's core functionality (indexing, search, graph queries, MCP server) is 100% local -- your code never leaves your machine.

The worldwide counter upload sends a single HTTP POST with a JSON body like {"amount": 4823}. No cookies, no tracking, no user ID. The Cloudflare Worker logs the country of your IP address (derived from request headers) for aggregate geographic statistics -- your actual IP address is not stored.

The model pricing refresh fetches a public JSON file from GitHub (raw.githubusercontent.com/BerriAI/litellm/main/model_prices_and_context_window.json) to keep Claude model pricing up to date for tokensave cost. No data is sent -- it is a plain HTTPS GET. The response is cached at ~/.tokensave/pricing.json for 24 hours. If the fetch fails, tokensave uses its compiled-in pricing table.

50+ Languages

tokensave supports more than 50 programming languages organized into three tiers controlled by Cargo feature flags. Each tier includes all languages from the tier below it. Markdown headers are extracted as Module nodes with hierarchical Contains edges so document structure participates in graph queries alongside source code.

Lite -- --no-default-features

Always compiled. The smallest binary for the most popular languages, plus Svelte and Astro (script-block extraction via the TypeScript extractor, no extra grammar dependency).

Medium (Lite + 9 more) -- --features medium

Full (Medium + everything else) -- default

Individual languages can also be cherry-picked without a full tier:

cargo install tokensave --no-default-features --features lang-nix,lang-bash

All extractors share the same depth: functions, classes, methods, fields, imports, call graphs, inheritance chains, docstrings, complexity metrics, decorator/annotation extraction, and cross-file dependency tracking.

tokensave vs CodeGraph

tokensave is a ground-up Rust rewrite of CodeGraph (Node.js/TypeScript). Both build semantic code graphs for AI coding agents, but they diverge significantly in scope and capabilities.

CodeGraph pioneered the approach and remains a solid choice if you prefer npm tooling and only need Claude Code integration. tokensave extends the concept with deeper analysis, more agents, multi-branch support, and a native binary with no runtime dependencies.

For detailed comparisons against CodeGraph, Dual-Graph (GrapeRoot), code-review-graph, and OpenWolf, see docs/COMPARABLE-TOOLS.md.

Why tokensave Over the Alternatives

Several tools reduce token usage for AI coding agents. Here's why tokensave stands apart.

Single native binary, zero dependencies

Every alternative requires a runtime: Python, Node.js, or both. tokensave ships as a single ~25 MB Rust binary with all 50+ tree-sitter grammars bundled. Nothing else to install.

Deepest code intelligence

tokensave works at the symbol level: functions, structs, fields, call edges, type hierarchies, complexity metrics. Alternatives like Dual-Graph (GrapeRoot) work at the file level -- they know which files exist but can't answer "who calls this function?" or "what breaks if I change this struct?" tokensave's 80+ specialized MCP tools cover call graph traversal, impact analysis, dead code detection, test mapping, rename preview, type hierarchies, circular dependency detection, complexity ranking, code-health analytics (Gini, DSM, dependency depth, risk-weighted test gaps), atomic edit primitives, and more. The closest competitor (code-review-graph) has 22 tools; others have 5-9.

Broadest agent support

More than a dozen AI coding agent integrations with per-agent native configuration formats. No other tool covers as many agents with as deep an integration. Claude Code gets hooks, prompt rules, and auto-allowed tool permissions. Kiro gets global MCP config, tokensave.md steering loaded as a resource, a managed agent with permissive built-in/tokensave tool approval, and hooks for delegation guardrails plus post-write sync. Other agents get MCP server registration in their native config format.

Multi-branch indexing

The only tool in this space with optional per-branch graph databases and cross-branch diff and search. When enabled, switching branches is instant -- no re-indexing required.

Per-call token tracking

The only tool that reports exactly how many tokens each individual MCP tool call saved, plus a live TUI monitor across all projects and lifetime counters.

Fully open source

MIT-licensed Rust, auditable end to end. Dual-Graph's core engine (graperoot on PyPI) is proprietary -- you can't see what it does with your code graph. OpenWolf is AGPL-3.0, which requires derivative works to be open-sourced.

Performance

Full-index benchmark on a 1,782-file mixed Rust/Java/Scala codebase (57K nodes, 103K edges):

Troubleshooting

"tokensave not initialized"

The .tokensave/ directory doesn't exist in your project.

tokensave init

MCP server not connecting

The AI agent doesn't see tokensave tools.

1. Ensure the agent config includes the tokensave MCP server (run tokensave doctor)
2. Restart the agent completely
3. Check that tokensave is in your PATH: which tokensave

Missing symbols in search

• Run tokensave sync to update the index
• Check that the language is supported (see table above)
• Verify the file isn't excluded by .gitignore

Indexing is slow

Large projects take longer on the first full index.

• Subsequent runs use incremental sync and are much faster
• Use tokensave sync (not --force) for day-to-day updates
• Staleness is checked automatically on every MCP tool call while an agent is connected

Disabling tokensave for specific projects

If a project is too large and tokensave uses too much RAM, you can disable it per-project by setting DISABLE_TOKENSAVE=true in the MCP server environment. The server exits cleanly without initializing.

Claude Code — add to your project's .claude/settings.json:

{
  "mcpServers": {
    "tokensave": {
      "command": "tokensave",
      "args": ["serve"],
      "env": {
        "DISABLE_TOKENSAVE": "true"
      }
    }
  }
}

Other agents — set the environment variable in whatever config your agent uses to launch MCP servers.

You can also set it globally via the shell (DISABLE_TOKENSAVE=true claude), but this disables tokensave for every project in the session.

Origin

This project is a Rust port of the original CodeGraph TypeScript implementation by @colbymchenry. The port maintains the same architecture and MCP tool interface while leveraging Rust for performance and native tree-sitter bindings.

Building

cargo build --release                          # full (50+ languages, default)
cargo build --release --features medium        # medium tier
cargo build --release --no-default-features    # lite (smallest binary)

cargo test                                     # run all tests (requires full)
cargo check --no-default-features              # verify lite compiles
cargo clippy --all

Star History

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Sponsors

<table> <tr> <td width="64" align="center" valign="middle"> <img src="src/resources/signpath-logo.svg" alt="SignPath" width="40"> </td> <td valign="middle"> Free code signing on Windows provided by <a href="https://signpath.io">SignPath.io</a>, certificate by <a href="https://signpath.org">SignPath Foundation</a> </td> </tr> </table>

License

MIT License -- see LICENSE for details.

[tokensave.dev](https://tokensave.dev)