io.github.Mibayy/token-savior MCP Server

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Token Savior -- v4.3

One MCP server. One profile. 97.9% on tsbench at -80% tokens. Structural code navigation, persistent memory, and Bash output compaction for AI coding agents.

mibayy.github.io/token-savior -- project site + benchmark landing github.com/Mibayy/tsbench -- benchmark source + fixtures

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Benchmark -- 96 real coding tasks (Claude Opus 4.7, May 2026)

	Plain Claude Code	With Token Savior
Score	141 / 180 (78.3%)	188 / 192 (97.9%)
Active tokens / task	17 221	3 395 (-80%)
Wall time / task	110.6 s	18.9 s (-83%)

Reproduces with the optimized profile (single env var). See BENCHMARK-SUMMARY.

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What's new

v4.3.0 -- bench-driven coverage push (May 2026)

Real-world bench against 7 days of transcripts (1130 Bash outputs) drove this release. Cumulative savings now sit at ~20.4 K tokens/week (19.3% match rate, 68.9% mean compaction) vs ~12 K/week on v4.2.0.

• Fixed pytest regex: now matches python3 -m pytest, uv run pytest, venv-prefixed forms, poetry/hatch/pdm/rye run pytest.
• 5 more git compactors: fetch, checkout, branch, worktree list, stash list.
• 4 more gh compactors: gh repo view, gh pr view, gh issue view, gh pr diff.
• grep, find, cat compactors. Group hits by file, strip common prefix, head/tail truncation. 83-96% savings on the fixtures.
• Compound command splitter: cd /root/foo && git status now compacts by picking the last meaningful segment of &&/; chains. Bails on subshells, heredocs, pipes, loops, unterminated quotes.

v4.2.0 -- coverage + hybrid mode + ts init

• 12 more compactors: jest, vitest, eslint, biome, kubectl get/logs, aws sts/ec2/lambda/logs/iam/dynamodb/s3, npm/yarn/pnpm list, pip list/show, curl. Peaks: 91.7% on aws ec2, 95% on jest all-green.
• Hybrid sandbox+compact mode. When a compactor matches but the compact text is still bulky (> 4 KB), the hook emits the compact preview AND sandboxes the full original. The agent can pull it via capture_get if it needs the detail.
• ts init --agent {claude,cursor,gemini,codex} CLI. Detects agent settings, deep-merges the hook config, dedups by (matcher, command), prints a unified diff, backs up settings.json, idempotent on re-run.
• ts_discover cross-project + format="adoption" reports TS-vs-native ratios per session with first/second-half trend.

v4.1.0 -- RTK-inspired Bash compaction + discover

• 14 Bash output compactors in a PostToolUse hook: git status/diff/log/ push/commit/add, pytest, cargo test/build/clippy, tsc, docker ps/logs, gh run list/view. Median 63%, peak 100% (a green pytest -q collapses to one line).
• PreToolUse Bash rewriter. Bare commands get denser variants before execution: git status -> --porcelain=v2 --branch, tsc -> --pretty false, pytest -> -q --tb=line, etc. 10 safe rules, guarded against composition operators and explicit verbose flags.
• get_usage_stats v2. ASCII sparkline (30 d), daily breakdown table (7 d), top-tools cumulative, format="json".
• New MCP tool ts_discover. Scans ~/.claude/projects/*/*.jsonl transcripts and flags missed TS opportunities (Read->Grep->Read chains, sequential find_symbol, edits without get_edit_context, memory_search without prior memory_index, native shell on code files). 30-day scan in ~2.5 s on a 343 MB transcript dir.

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Quick start

pip install "token-savior-recall[mcp]"

Add to your MCP config (e.g. Claude Code):

{
  "mcpServers": {
    "token-savior-recall": {
      "command": "/path/to/venv/bin/token-savior",
      "env": {
        "WORKSPACE_ROOTS": "/path/to/project1,/path/to/project2",
        "TOKEN_SAVIOR_CLIENT": "claude-code",
        "TOKEN_SAVIOR_PROFILE": "optimized"
      }
    }
  }
}

That's it. TOKEN_SAVIOR_PROFILE=optimized ships the Pareto-optimum config that wins tsbench. It bundles:

• tiny_plus (15 hot tools manifest)
• thin inputSchema (-44% manifest)
• capture sandbox disabled
• memory hooks gated for cross-project safety

No other tuning needed.

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Activation (Bash compaction + rewriting)

Bash compaction and the PreToolUse rewriter are opt-in. Two env vars and one CLI call:

export TS_BASH_COMPACT=1       # PostToolUse output compactors (34 of them)
export TS_BASH_REWRITE=1       # PreToolUse command rewriter (10 rules)

ts init --agent claude --yes   # auto-merge hooks into ~/.claude/settings.json

ts init is idempotent. It detects existing hook entries, dedups by (matcher, command), prints a unified diff, and backs up settings.json to .bak-YYYYMMDD-HHMMSS (UTC) before writing. Supported agents: claude, cursor, gemini, codex. Pass --dry-run to preview, or --global to write the user-level config.

Optional audit log of every rewrite:

export TS_BASH_REWRITE_LOG=$HOME/.local/state/token-savior/rewrites.jsonl

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Compactor catalog (34)

Family	Compactors
git	status, diff, log, push/pull, commit, add, fetch, checkout, branch, worktree list, stash list
gh	run list, run view, pr diff, pr view, issue view, repo view
test/lint	pytest, jest, vitest, eslint, biome, cargo test, cargo build/clippy, tsc
cloud	kubectl get, kubectl logs, aws sts, aws ec2, aws lambda, aws logs, aws iam, aws dynamodb, aws s3
docker	docker ps, docker logs
packaging	npm/yarn/pnpm list, pip list/show
shell catch-alls	grep, find, cat, curl

Each compactor is a pure function (no I/O, no globals) returning a token-efficient rendering. The dispatcher returns None when no matcher fires, leaving the existing sandbox path untouched. Compound commands (cd ... && cmd) fall through to the last meaningful segment.

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ts_discover -- find missed TS opportunities

New MCP tool that scans your Claude Code transcripts for patterns where TS tools would have been cheaper than what the agent actually did.

ts_discover()                       # active project, last 30 days
ts_discover(project=None)           # ALL transcript projects
ts_discover(format="adoption")      # TS vs native ratio per session
ts_discover(format="adoption_json") # same, JSON

Findings: Read->Grep->Read chains, sequential find_symbol, edits without get_edit_context, memory_search without memory_index, native shell on code files. Args are pruned to load-bearing keys (PII-safe). Streams JSONL with mtime fast-skip.

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ts init CLI

ts init --agent claude [--global] [--dry-run] [--yes]
ts init --agent cursor
ts init --agent gemini
ts init --agent codex

Detects the target agent's settings location, deep-merges the Token Savior hook config (PostToolUse + PreToolUse), preserves existing hooks, dedups, prints a unified diff. Backs up to settings.json.bak-YYYYMMDD-HHMMSS (UTC). Re-running is a no-op.

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What it does

Claude Code reads whole files to answer questions about three lines, and forgets everything the moment a session ends. Token Savior fixes both, plus a third axis: it now compacts the noisy Bash output that bloats turn budgets between code reads.

It indexes your codebase by symbol -- functions, classes, imports, call graph -- so the model navigates by pointer instead of by cat. Measured reduction: 97% fewer chars injected across 170+ real sessions.

On top of that sits a persistent memory engine. Every decision, bugfix, convention, guardrail and session rollup is stored in SQLite WAL + FTS5

• vector embeddings, ranked by Bayesian validity and ROI, and re-injected as a compact delta at the start of the next session.

And on top of that, since v4.1, sit the Bash compactors and the PreToolUse rewriter. Bench numbers above.

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Profile comparison

Profile	Tools exposed	Manifest tokens	When to use
optimized	15	~1.5 KT	Recommended default -- Pareto win on tsbench
auto	adaptive	~1-2 KT	Per-client telemetry-based (experimental)
tiny	6	~0.6 KT	Minimal hot loop
lean	51	~4 KT	Legacy -- broader surface
full	68	~6 KT	Everything exposed

You probably want optimized.

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Token savings

Operation	Plain Claude	Token Savior	Reduction
find_symbol("send_message")	41M chars (full read)	67 chars	-99.9%
get_function_source("compile")	grep + cat chain	4.5K chars	direct
get_change_impact("LLMClient")	impossible	16K chars	new capability
96-task tsbench (Opus, plain vs ts)	17 221 active/task	3 395 active/task	-80%
7-day Bash output bench (v4.3)	~30 K tokens/week	~9.6 K tokens/week	~20.4 K/week

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Install

pip (MCP server)

pip install "token-savior-recall[mcp]"
# Optional hybrid vector search:
pip install "token-savior-recall[mcp,memory-vector]"

uvx (no venv, no clone)

uvx token-savior-recall

Claude Code one-liner

claude mcp add token-savior -- /path/to/venv/bin/token-savior

Development

git clone https://github.com/Mibayy/token-savior
cd token-savior
python3 -m venv .venv
.venv/bin/pip install -e ".[mcp,dev]"
pytest tests/ -q

Suite size: 1688 passed, 55 skipped on main. CI green on Python 3.11 / 3.12 / 3.13.

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Bench it yourself

The compactor numbers above come from replaying real Claude Code transcripts through the dispatcher. Two scripts live under scripts/:

python3 scripts/bench_compactors_real.py       # match rate + mean savings
python3 scripts/bench_compactors_unmatched.py  # top unmatched commands

The first walks ~/.claude/projects/*/*.jsonl, replays every Bash output through the registry, and reports per-family savings + overall match rate. The second buckets the unmatched commands so the next compactor target is obvious from the histogram.

To reproduce the tsbench score:

git clone https://github.com/Mibayy/tsbench && cd tsbench
python3 generate.py --seed 42
git tag v1
python3 breaking_changes.py
git tag v2
TS_PROFILE=tiny_plus TS_CAPTURE_DISABLED=1 python3 bench.py --tasks all --run B

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Bonus: ts CLI for non-MCP agents

For agents without MCP (Cursor, Aider, Continue, scripts, CI), the ts command exposes a subset of the tools via shell:

ts use /path/to/project
ts get my_function          # JSON output
ts search 'pattern'
ts daemon start             # ~145ms per call vs 1.5s cold fork
ts init --agent cursor      # wire up Bash hooks for non-Claude agents

On Claude Code, prefer the MCP server -- measured cheaper than CLI on Opus 4.7. The CLI is there for the portability case.

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Optional env vars

Var	Purpose
TS_BASH_COMPACT=1	Enable PostToolUse Bash output compactors
TS_BASH_REWRITE=1	Enable PreToolUse Bash command rewriter
TS_BASH_REWRITE_LOG	JSONL audit log of every rewrite
TS_COMPACT_INLINE_THRESHOLD	Hybrid mode threshold (default 4 KB)
TS_COMPACT_TINY_THRESHOLD	Skip-sandbox threshold (default 256 B)
TELEGRAM_BOT_TOKEN + TELEGRAM_CHAT_ID	Critical-observation feed
TS_VIEWER_PORT	Web viewer dashboard
TS_AUTO_EXTRACT=1 + TS_API_KEY	LLM auto-extraction of memory observations
TS_CAPTURE_DISABLED=1	Skip read-side capture sandboxing (default in optimized)
TS_MEMORY_DISABLE=1	Silence memory hooks (clean-context workloads)

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License

MIT