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save-tokens

Token-saving session automation — statusline, prompt guard, precompact handoffs, session rotation, and handoff commands for Claude Code

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Precio sin confirmar★ 100 Estrellas de GitHubRegistro actualizado · 21 sept 2026agent-skill

Resumen

Token-saving session automation — statusline, prompt guard, precompact handoffs, session rotation, and handoff commands for Claude Code

Leer documentación completa

Documentación de origen, no instrucciones para este sitio. Revisa los permisos antes de ejecutar comandos.

You are working on save-tokens — the feature that installs Claude Code hooks and commands to warn about token usage, auto-save handoffs before compaction, and support session rotation.

Domain purpose

aspens save-tokens installs three Claude Code hooks (statusline, prompt-guard, precompact) plus /save-handoff, /resume-handoff-latest, and /resume-handoff slash commands. The hooks observe Claude's own token telemetry and inject system messages telling Claude to rotate sessions before context blow-up. Handoff files persist enough state in .aspens/sessions/ to resume seamlessly in a fresh session.

Business rules / invariants

  • Claude-only feature. Hooks and statusline only work with Claude Code; Codex has no save-tokens integration. Config lives in .aspens.json under saveTokens.
  • Config thresholds default 175k warn / 200k compact. Number.MAX_SAFE_INTEGER is the disabled sentinel for either threshold; target.js#isValidSaveTokensConfig() validates shape, types, and threshold ordering — invalid config causes readConfig() to return null.
  • writeConfig preserves feature config — saveTokens is preserved across writeConfig calls unless explicitly set to null.
  • Sessions dir gitignored — .aspens/sessions/.gitignore excludes everything except .gitignore and README.md.
  • Settings backup — first install creates .claude/settings.json.bak if settings exist and no backup exists yet.
  • StatusLine pre-existence guard — canInstallSaveTokensStatusLine() refuses to overwrite an unrelated custom statusLine.command; when refused, applyStatusLineAvailability() forces both thresholds to MAX_SAFE_INTEGER and disables sessionRotation.

Non-obvious behaviors

  • Three hook entry points dispatched by subcommand. Shell wrappers (*.sh) read stdin, resolve project dir, and call save-tokens.mjs with statusline, prompt-guard, or precompact. ASPENS_PROJECT_DIR env var overrides CLAUDE_PROJECT_DIR; both fall back to cwd.
  • Statusline doubles as telemetry recorder. recordClaudeContextTelemetry() writes .aspens/sessions/claude-context.json summing input_tokens + cache_creation_input_tokens + cache_read_input_tokens + output_tokens from context_window.current_usage. Telemetry older than 5 minutes is ignored by the prompt guard.
  • Prompt-guard speaks to Claude, not the user. Above compactAtTokens: saves a handoff (reason rotation-threshold if sessionRotation, else compact-threshold) and stdout-prints an "IMPORTANT — you must tell the user" block instructing fresh session + /resume-handoff-latest. Above warnAtTokens: suggests /save-handoff. When telemetry is missing, prints a one-time link to the aspens issues page.
  • Precompact hook only fires when saveHandoff is enabled and claude.enabled !== false; reason is precompact.
  • extractSessionFacts() parses the JSONL transcript to extract originalTask (first user message, 500 char cap), recentPrompts (last 3, 200 char cap each), filesModified (Edit/Write tool_use file_path), gitCommits (regex on Bash git commit -m "..."), and branch (from gitBranch on user records). Transcript path is validated to be inside projectDir; falls back to input.prompt when transcript is missing or outside the project.
  • Transcript parsing is best-effort — all errors caught, invalid JSON lines silently skipped; returns empty facts on failure.
  • pruneOldHandoffs() keeps newest 10 *-handoff.md files by lexicographic (timestamp) sort; older are unlinked. latestHandoff() uses the same sort.
  • --recommended install is non-interactive — used standalone or invoked by doc init --recommended (which also installs agents and the doc-sync git hook).
  • --remove cleans legacy artifacts too — removes both .sh and historic .mjs variants of each hook, plus the legacy save-tokens-resume.md command; strips statusLine if it points at save-tokens and filters any hook entry whose command contains save-tokens-; nulls saveTokens in .aspens.json.

Critical files (purpose, not inventory)

  • src/commands/save-tokens.js — install/remove orchestration; interactive multiselect (warnings, handoffs), --recommended, --remove. Exports installSaveTokensRecommended() consumed by doc-init.js.
  • src/lib/save-tokens.js — config + settings + template content builders (DEFAULT_SAVE_TOKENS_CONFIG, buildSaveTokensConfig, buildSaveTokensSettings, buildSaveTokensGitignore, buildSaveTokensReadme, buildSaveTokensRecommendations).
  • src/templates/hooks/save-tokens.mjs — runtime library: runStatusline, runPromptGuard, runPrecompact, saveHandoff, extractSessionFacts, telemetry record/read, handoff pruning, main() subcommand dispatch.
  • src/templates/hooks/save-tokens-{statusline,prompt-guard,precompact}.sh — shell wrappers; resolve PROJECT_DIR via cd "$SCRIPT_DIR/../.." && pwd and exec the .mjs with the matching subcommand.
  • src/templates/commands/{save-handoff,resume-handoff-latest,resume-handoff}.md — slash command bodies installed under .claude/commands/.

Critical Rules

  • Settings merge uses mergeSettings() from skill-writer.js — save-tokens hooks are treated as aspens-managed; do not hand-edit .claude/settings.json to add/remove save-tokens entries.
  • Hooks write to stdout to inject into Claude's context — comments in runPromptGuard() flag this; keep those messages addressed to Claude ("Tell the user...") not to a human reader.
  • Token sum includes cache tokens — do not switch to just input_tokens + output_tokens; that under-counts Claude's effective context use.

References

  • Impact integration: src/lib/impact.js — evaluateSaveTokensHealth() validates installed state

Last Updated: 2026-05-11

Metadatos del archivo
name: save-tokens
description: Token-saving session automation — statusline, prompt guard, precompact handoffs, session rotation, and handoff commands for Claude Code
triggers:
  files:
    - src/commands/save-tokens.js
    - src/lib/save-tokens.js
    - src/templates/hooks/save-tokens*.sh
    - src/templates/hooks/save-tokens.mjs
    - src/templates/commands/save-handoff.md
    - src/templates/commands/resume-handoff*.md
    - tests/save-tokens*.test.js
  keywords:
    - save-tokens
    - handoff
    - statusline
    - prompt-guard
    - precompact
    - session rotation
    - token warning
Ver texto original
---
name: save-tokens
description: Token-saving session automation — statusline, prompt guard, precompact handoffs, session rotation, and handoff commands for Claude Code
triggers:
  files:
    - src/commands/save-tokens.js
    - src/lib/save-tokens.js
    - src/templates/hooks/save-tokens*.sh
    - src/templates/hooks/save-tokens.mjs
    - src/templates/commands/save-handoff.md
    - src/templates/commands/resume-handoff*.md
    - tests/save-tokens*.test.js
  keywords:
    - save-tokens
    - handoff
    - statusline
    - prompt-guard
    - precompact
    - session rotation
    - token warning
---

You are working on **save-tokens** — the feature that installs Claude Code hooks and commands to warn about token usage, auto-save handoffs before compaction, and support session rotation.

## Domain purpose
`aspens save-tokens` installs three Claude Code hooks (statusline, prompt-guard, precompact) plus `/save-handoff`, `/resume-handoff-latest`, and `/resume-handoff` slash commands. The hooks observe Claude's own token telemetry and inject system messages telling Claude to rotate sessions before context blow-up. Handoff files persist enough state in `.aspens/sessions/` to resume seamlessly in a fresh session.

## Business rules / invariants
- **Claude-only feature.** Hooks and statusline only work with Claude Code; Codex has no save-tokens integration. Config lives in `.aspens.json` under `saveTokens`.
- **Config thresholds default 175k warn / 200k compact.** `Number.MAX_SAFE_INTEGER` is the disabled sentinel for either threshold; `target.js#isValidSaveTokensConfig()` validates shape, types, and threshold ordering — invalid config causes `readConfig()` to return `null`.
- **`writeConfig` preserves feature config** — `saveTokens` is preserved across `writeConfig` calls unless explicitly set to `null`.
- **Sessions dir gitignored** — `.aspens/sessions/.gitignore` excludes everything except `.gitignore` and `README.md`.
- **Settings backup** — first install creates `.claude/settings.json.bak` if settings exist and no backup exists yet.
- **StatusLine pre-existence guard** — `canInstallSaveTokensStatusLine()` refuses to overwrite an unrelated custom `statusLine.command`; when refused, `applyStatusLineAvailability()` forces both thresholds to `MAX_SAFE_INTEGER` and disables `sessionRotation`.

## Non-obvious behaviors
- **Three hook entry points dispatched by subcommand.** Shell wrappers (`*.sh`) read stdin, resolve project dir, and call `save-tokens.mjs` with `statusline`, `prompt-guard`, or `precompact`. `ASPENS_PROJECT_DIR` env var overrides `CLAUDE_PROJECT_DIR`; both fall back to `cwd`.
- **Statusline doubles as telemetry recorder.** `recordClaudeContextTelemetry()` writes `.aspens/sessions/claude-context.json` summing `input_tokens + cache_creation_input_tokens + cache_read_input_tokens + output_tokens` from `context_window.current_usage`. Telemetry older than 5 minutes is ignored by the prompt guard.
- **Prompt-guard speaks to Claude, not the user.** Above `compactAtTokens`: saves a handoff (reason `rotation-threshold` if `sessionRotation`, else `compact-threshold`) and stdout-prints an "IMPORTANT — you must tell the user" block instructing fresh session + `/resume-handoff-latest`. Above `warnAtTokens`: suggests `/save-handoff`. When telemetry is missing, prints a one-time link to the aspens issues page.
- **Precompact hook only fires when `saveHandoff` is enabled** and `claude.enabled !== false`; reason is `precompact`.
- **`extractSessionFacts()` parses the JSONL transcript** to extract `originalTask` (first user message, 500 char cap), `recentPrompts` (last 3, 200 char cap each), `filesModified` (Edit/Write tool_use `file_path`), `gitCommits` (regex on Bash `git commit -m "..."`), and `branch` (from `gitBranch` on user records). Transcript path is validated to be inside `projectDir`; falls back to `input.prompt` when transcript is missing or outside the project.
- **Transcript parsing is best-effort** — all errors caught, invalid JSON lines silently skipped; returns empty facts on failure.
- **`pruneOldHandoffs()` keeps newest 10** `*-handoff.md` files by lexicographic (timestamp) sort; older are unlinked. `latestHandoff()` uses the same sort.
- **`--recommended` install is non-interactive** — used standalone or invoked by `doc init --recommended` (which also installs agents and the doc-sync git hook).
- **`--remove` cleans legacy artifacts too** — removes both `.sh` and historic `.mjs` variants of each hook, plus the legacy `save-tokens-resume.md` command; strips `statusLine` if it points at save-tokens and filters any hook entry whose command contains `save-tokens-`; nulls `saveTokens` in `.aspens.json`.

## Critical files (purpose, not inventory)
- `src/commands/save-tokens.js` — install/remove orchestration; interactive multiselect (`warnings`, `handoffs`), `--recommended`, `--remove`. Exports `installSaveTokensRecommended()` consumed by `doc-init.js`.
- `src/lib/save-tokens.js` — config + settings + template content builders (`DEFAULT_SAVE_TOKENS_CONFIG`, `buildSaveTokensConfig`, `buildSaveTokensSettings`, `buildSaveTokensGitignore`, `buildSaveTokensReadme`, `buildSaveTokensRecommendations`).
- `src/templates/hooks/save-tokens.mjs` — runtime library: `runStatusline`, `runPromptGuard`, `runPrecompact`, `saveHandoff`, `extractSessionFacts`, telemetry record/read, handoff pruning, `main()` subcommand dispatch.
- `src/templates/hooks/save-tokens-{statusline,prompt-guard,precompact}.sh` — shell wrappers; resolve `PROJECT_DIR` via `cd "$SCRIPT_DIR/../.." && pwd` and exec the `.mjs` with the matching subcommand.
- `src/templates/commands/{save-handoff,resume-handoff-latest,resume-handoff}.md` — slash command bodies installed under `.claude/commands/`.

## Critical Rules
- **Settings merge uses `mergeSettings()`** from `skill-writer.js` — save-tokens hooks are treated as aspens-managed; do not hand-edit `.claude/settings.json` to add/remove save-tokens entries.
- **Hooks write to stdout to inject into Claude's context** — comments in `runPromptGuard()` flag this; keep those messages addressed to Claude ("Tell the user...") not to a human reader.
- **Token sum includes cache tokens** — do not switch to just `input_tokens + output_tokens`; that under-counts Claude's effective context use.

## References
- **Impact integration:** `src/lib/impact.js` — `evaluateSaveTokensHealth()` validates installed state

---
**Last Updated:** 2026-05-11

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  • Permission surface needs review: secrets or environment access, shell or command execution
  • Stars/forks activity: 100 stars, 7 forks; issue activity unavailable in current metadata
  • Dependency/runtime risk: command execution surface, credential or environment access
  • Permission surface: secrets or environment access, shell or command execution
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Repositorio fuente
aspenkit/aspens
Licencia
MIT
Versión
1.0.0
Último push de GitHub
12 sept 2026
Registro actualizado
21 sept 2026

Versión declarada en el registro; consulta las versiones de la fuente.

Calidad

64/100

Prometedor

Confianza

66/100

Solo sandbox

Auditoría

76/100

Requiere revisión

  • Dependency or permission surface needs review
  • Permission surface may require sandboxing
  • Quality score needs review
  • Permission surface needs review: secrets or environment access, shell or command execution
  • Stars/forks activity: 100 stars, 7 forks; issue activity unavailable in current metadata
  • Dependency/runtime risk: command execution surface, credential or environment access
  • Permission surface: secrets or environment access, shell or command execution
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  "agent_contract": {
    "task_input": "Use save-tokens in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 74/100 Strong shortlist",
      "Audit: 76/100 Needs review",
      "Safety: 36/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "aspenkit-save-tokens (save-tokens)",
      "install_command": "npx skills add aspenkit/aspens --skill save-tokens",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "aspenkit-save-tokens",
      "task": "Use save-tokens in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/aspenkit-save-tokens",
    "api": "https://www.openagentskill.com/api/agent/skills/aspenkit-save-tokens",
    "audit": "https://www.openagentskill.com/skills/aspenkit-save-tokens/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=aspenkit-save-tokens&task=Use%20save-tokens%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20save-tokens%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20save-tokens%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/aspenkit-save-tokens/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/aspenkit-save-tokens"
  }
}

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Creador
aspenkit
Indexado por
Índice comunitario de OpenAgentSkill

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[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/aspenkit-save-tokens?metric=listed&label=Listed)](https://www.openagentskill.com/skills/aspenkit-save-tokens?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/aspenkit-save-tokens?metric=trust&label=Trust)](https://www.openagentskill.com/skills/aspenkit-save-tokens?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/aspenkit-save-tokens?metric=audit&label=Audit)](https://www.openagentskill.com/skills/aspenkit-save-tokens/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/aspenkit-save-tokens?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/aspenkit-save-tokens?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

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