# ⚡ dsh-fast
- **1024 store channel**: `npm i -g dsh1024` once, then `dsh1024 plugin --profile web add dsh-fast` (counts toward the [deepseek1024.com](https://deepseek1024.com) install ranking).
[](https://gitee.com/perrylink/dsh-fast)
[](https://dshfind.com/plugins/PerryLink/dsh-fast?ref=badge)
[](https://api.securityscorecards.dev/projects/github.com/PerryLink/dsh-fast)
**Read-only performance diagnostics for DeepSeek Harness.**
*Observes the session event stream — never the model hot path — and reports where latency and context budget actually go.*
> **Official repository.** This is the only official repository of dsh-fast, maintained by PerryLink. Same-name repositories under other accounts are not affiliated.
[](LICENSE)
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[](https://github.com/PerryLink/dsh-fast/releases)
[](https://www.npmjs.com/package/dsh-fast)
[](https://www.npmjs.com/package/dsh-fast)
[English](README.md) · [简体中文](README-zh.md) · [Español](README-es.md) · [Português](README-pt.md) · [हिन्दी](README-hi.md)
```sh
dsh plugin --profile add dsh-fast
```
---
**📖 Ecosystem knowledge base** — measured data, not marketing: [plugin development guide · plugin-selection data · maintenance criteria](https://perrylink.github.io/dsh-plugin-guide/).
## Install & uninstall
```sh
dsh plugin --profile demo add dsh-fast # install
dsh plugin --profile demo remove dsh-fast # uninstall
```
Verify the row mounts: `dsh --profile demo --dump-config | grep dsh-fast`.
## ⭐ 如果它帮到了你
这个插件是 [DSH 插件家族](https://github.com/PerryLink)的一员（95 个，全部 Apache-2.0）。如果你在用，**给个 star** —— 它不会解锁任何功能，但会让下一个人在搜索里更容易找到它。
*English:* part of a 95 plugin family for DeepSeek Harness. If it is useful, **a star helps the next person find it** — nothing is gated behind it.
## What is dsh-fast?
Read-only performance diagnostics for DeepSeek Harness.
Observes the session event stream — never the model hot path — and reports where latency and context budget actually go.
*Workflow overview: request → policy / review → verdict. The examples below use the real command surface.*
## Compatibility
- DeepSeek Harness `dsh-v0.2.1-alpha.1` (adapted 2026-09-18): the session surface is read through the optional `sessionQuery` service — the deprecated synchronous `Session.eventAt(seq)` accessor is gone, with an equivalent synchronous read as the fallback — and every registration now lives in one lifecycle effect that releases them in reverse order. Internal implementation change: the reported metrics are identical for the same log. Verified 2026-10-04 against the local gate chain (three typecheck rulers + 71 tests); the compat workflow re-runs the profile install smoke against the published pins.
- Node `^22.19.0 || >=24.0.0`, ESM only (`"type": "module"`).
- Peer dependencies: `@deepseek-ai/cordis ^4.0.2`, `@deepseek-ai/schemastery ^3.18.4`, and `@deepseek-ai/dsh-session`, `@deepseek-ai/dsh-tools`, `@deepseek-ai/dsh-commands`, `@deepseek-ai/dsh-compaction`, `@deepseek-ai/dsh-session-query`, `@deepseek-ai/dsh-storage-domain` at `>=0.1.2-rc.1 <0.2.0 || >=0.1.5-alpha.1 <0.2.0 || >=0.1.6-0 <0.2.0 || >=0.1.7-0 <0.2.0 || >=0.2.0-0 <0.3.0 || >=0.2.1-0 <0.3.0` (devDependencies pin `0.2.0-rc.2`); the `0.1.2-rc.1` line stays supported at runtime through a structural fallback to the pre-0.1.5 `header.system`.
## What you get
- **Session load timing** — publication-to-first-request latency, classified `open` (fresh) vs `restore` (seeded/resumed), plus the restored seed-event count.
- **Spill-hit statistics** — how many tool results were spilled to a session-scoped artifact (detected from the durable spill notice).
- **Compaction count and trigger** — total compactions, split `manual` (slash command) vs `automatic` (pressure), and total shadowed tokens.
- **Context-injection volume** — system-prompt (AGENTS.md + skills + persona), tool-schema, and surface tokens with their shares of the total; the surface bucket is conversation history only (the meter's surface includes the system node on `0.1.5-alpha.1`, which dsh-fast subtracts).
- **LLM cache hit rate** — input / cache-read / cache-write / output tokens aggregated from provider usage, plus the derived hit rate.
- **Optimization suggestions** — threshold-driven notes (trim skills, tighten tool schemas, compact earlier, enable prompt caching, enable spill-policy, …).
- **Async sampling** — metrics are folded O(1) per event and snapshotted on a timer, never on the append path.
## Quick start
```sh
dsh plugin --profile web add github:PerryLink/dsh-fast
```
### git channel
```sh
# From a scratch profile (pins the commit; runs the self-contained `prepare` build)
dsh plugin --profile demo add "github:YOUR_ORG/dsh-fast#"
# The profile's pnpm-workspace.yaml gains an allowBuilds entry for dsh-fast on first add.
```
### npm channel
```sh
dsh plugin --profile demo add dsh-fast
```
Both channels install the bundle row (see `cordis.patch.yml`) into the profile's `dsh.profile.bundles` stack and take effect on restart.
## `/fast` namespace collision
`/fast` is a host command. If another plugin registers a **client** `commandUi`
contribution also named `fast`, the host command menu can drop the whole `/`
source. That collision is in the host's client command namespace, not something
this plugin can rename at runtime. Workaround: disable/rename the other
plugin’s `fast` client command, or remove one of the plugins. `/fast` itself and
`fast_report` still work when no duplicate client contribution exists.
### Examples
These are the plugin's real entry points; install once, then call one.
#### Detailed example
**Command**
~~~sh
/fast
~~~
**Output**
~~~text
dsh-fast 0.1.0 — performance report
session: abc
## Session load
kind: open
seed events: 0
time to first request: 150 ms
## Spill
detected spilled results: 0 (heuristic)
## Compaction
count: 0 (manual: 0, automatic: 0)
shadowed tokens: 0
## Context volume
total: 1000 tokens
system (AGENTS.md/skills/persona): 400 (40%)
tool schema: 200 (20%)
surface: 400 (40%)
## System prompt breakdown
persona: 100 tokens / 400 chars (25%)
skills: 0 tokens / 0 chars (0%)
AGENTS.md: 0 tokens / 0 chars (0%)
other (harness identity + tool guidance): 300 tokens / 1200 chars (75%)
## LLM cache
input: 800, cache read: 200, cache write: 50, output: 100
hit rate: 20%
## Suggestions
- none
~~~
*Observed from `plugins/dsh-fast/src/analyze.ts:88-131; baseline fixture at test/analyze.spec.ts:12-35, 82-100`*
#### Failure branch
**Input**
~~~text
/fast --history nope
~~~
**Output**
~~~text
Usage: /fast [--history [n]]
~~~
*Observed from `plugins/dsh-fast/src/index.ts:241-245`*
#### Brief examples
- `fast_report`
## Configuration
All tunables are Schemastery `Config` fields; invalid values fail the profile load loudly.
| Key | Default | Description |
| --- | --- | --- |
| `enabled` | `true` | Master switch; `false` mounts nothing. |
| `privacy.includeCwd` | `false` | Include the sanitized session working directory in reports. |
| `sampling.snapshotIntervalMs` | `60000` | How often active sessions are sampled (ms). |
| `sampling.maxHistorySamples` | `20` | Samples retained per session in the durable history. |
| `thresholds.systemPromptTokens` | `20000` | Warn when the system prompt exceeds this many tokens. |
| `thresholds.toolSchemaTokens` | `8000` | Warn when the tool schema exceeds this many tokens. |
| `thresholds.surfaceTokens` | `60000` | Warn when the conversation surface exceeds this many tokens. |
| `thresholds.cacheHitRateFloor` | `0.1` | Warn when the cache hit rate falls below this (0..1). |
| `thresholds.compactionCountWarn` | `10` | Warn once this many compactions have triggered. |
| `thresholds.compactionShadowTokens` | `40000` | Warn when the average shadowed token count per summary exceeds this. |
| `spill.detectSpilledResults` | `true` | Detect spilled tool results from the durable notice marker. |
## Tools & surfaces
- **`/fast`** — a human slash command that prints the current session's health report: load timing, spill, compaction, context-volume ranking, cache hit rate, and suggestions.
- **`fast_report`** — a model tool returning the same report as structured JSON (so the model can reason over it), with a human-readable text render.
## Permissions & data
`dsh-fast` consumes only public seams: `session/*` and `agent/*` events, the optional `ctx.tokenMeter`, `ctx.storageDomain`, `ctx.commands`, and `ctx.tools`. It is strictly read-only over the session log — it never mutates the model request, tool results, or the session surface. Metrics are persisted to the `dsh_fast` storage domain (one bounded history per session), not to the session log. Report identity and the optional working directory are sanitized before any display or durable write.
## Security boundaries
- **Read-only, zero model-path overhead** — folding is O(1) per event; sampling runs on a timer.
- **No network, no credential handling** — the plugin makes no outbound requests and stores nothing sensitive.
- **Fail-loud configuration** — every tunable is validated at mount; invalid bounds throw.
- **Sanitized display/durable data** — control characters are stripped and strings are budgeted; `cwd` is off by default and path-truncated when enabled.
- **Reversible registrations** — every contribution goes through `ctx.effect()` / `ctx.on()` / `register()`, so uninstall and hot reload are clean.
## Known limitations
- **Storage domain, not session events** — rc.2 `Session.append` offers no `ignorable` marker and no external event-registration surface, so a custom `fast/*` session event would make the persistence coordinator refuse the log on restore. Metrics are therefore persisted to the storage domain; the raw events remain the reconstructable source of truth.
- **Spill detection is heuristic** — it reads the durable spill notice (`Full … stored at:`); no dedicated session event exists.
- **System prompt is one bucket** — AGENTS.md, skill directory, and persona are all part of the assembled system prompt; since `0.1.5-alpha.1` it is surface node 0 (a `system/message`) and carries no per-section token accounting, so they are reported together.
- **Load timing starts at publication** — the disk-read portion of a restore happens before `session/created` (owned by `sessionPersistence`) and is not observable from this plugin's allowed events; the reported duration is publication-to-first-request.
- **Degradations are announced once** — a host without `tokenMeter` falls back to heuristic token pricing, a host without `systemPrompt` attributes the whole prompt to one bucket, and a failing `inspector` outlet is ignored; each of these now says so once per process instead of changing what the numbers mean in silence.
## Development
```sh
pnpm install
pnpm run typecheck && pnpm run typecheck:ci && pnpm run typecheck:checkout
pnpm test
pnpm run build
pnpm run verify:self-contained && pnpm run verify:artifacts
node scripts/check-readme-sync.mjs
pnpm pack
```
## Topics
`dsh`, `dsh-plugin`, `deepseek-harness`, `deepseek`, `cordis`, `performance`, `diagnostics`, `profiling`, `context-engineering`, `llm-cache`
## Contributors
Thanks to everyone who has contributed to `dsh-fast`:
- **[PerryLink](https://github.com/PerryLink)** — author and maintainer: designed and built the read-only diagnostics (session-load timing, spill-hit counts, compaction metrics, context-injection volume, LLM cache hit rate), the `/fast` command and `fast_report` tool, the `dsh_fast` storage domain, and the five-language documentation.
## PerryLink DSH Plugin Family
This project is part of the DeepSeek Harness plugin family from [PerryLink](https://github.com/PerryLink). The roster stays collapsed below so every README keeps a short first screen; expand it to see every row and its status.
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| **[dsh-defend](https://github.com/PerryLink/dsh-defend)** | 🧊 FROZEN — see the repo README |
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| **[dsh-background-agents](https://github.com/PerryLink/dsh-background-agents)** | 🚫 RETIRED — see the repo README |
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## License
Apache-2.0 — see [LICENSE](LICENSE).