# shyn (mcpb · shyn.mcpb)

Local-first ambient memory for your Mac — pages, meetings, notes, encrypted on-device.

- Trust score: 50/100 (low)
- Change this week: 0
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- mcpb · `shyn.mcpb`: 50/100 (this document), [markdown](https://verifymcp.io/servers/day-shyn-shyn/https-github-com-shyn-labs-homebrew-tap-releases-download-v0-5-15-alpha-shyn-mcp.md), [page](https://verifymcp.io/servers/day-shyn-shyn/https-github-com-shyn-labs-homebrew-tap-releases-download-v0-5-15-alpha-shyn-mcp)

## Channel facts

- Registry: `mcpb`
- Package: `https://github.com/shyn-labs/homebrew-tap/releases/download/v0.6.3-alpha/shyn.mcpb`
- Transport: `stdio`
- SHA-256: `6b8ae67921ed1e5f5a159381d66bf43abd6bbbd692a9764b2b052cf9c926fbfb`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Supply Chain Security**: 0/100
  - No malware scan is available for this kind of package: the supply-chain vendors we use do not cover it. This is a permanent gap in our coverage, not a finding about the package.
  - Known CVEs could not be checked: we found no dependency list to check in this bundle: either it runs a compiled binary, whose bundled manifests we do not read, or none of the package.json, requirements.txt, pyproject.toml or uv.lock files it ships for its runtime declares a dependency we can read (a requirements.txt that only points at a setup.py project, a local path, or a nested requirements file we cannot follow counts as none).
  - Install-script risk not yet assessed.
  - Dependency health could not be checked: we found no dependency list to check in this bundle: either it runs a compiled binary, whose bundled manifests we do not read, or none of the package.json, requirements.txt, pyproject.toml or uv.lock files it ships for its runtime declares a dependency we can read (a requirements.txt that only points at a setup.py project, a local path, or a nested requirements file we cannot follow counts as none).
- **Provenance & Transparency**: 32/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - License check failed: no license is declared.
  - Actively maintained (last published 0 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 74/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 688 tokens (~114/item across 6 items; 6 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **Tool Coverage**: 79/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 38% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### How do I install the shyn MCP server?

shyn ships as an MCPB bundle, a single file you download and open in an MCP host that supports MCPB bundles, such as Claude Desktop. The host reads the launch command from the bundle's own manifest, so there is no command to copy. Before opening it, check the file's SHA-256 matches the one the MCP registry declares for it, 6b8ae67921ed1e5f5a159381d66bf43abd6bbbd692a9764b2b052cf9c926fbfb; the commands to do that are on this page. If it does not match, do not open it.

- Download bundle: `https://github.com/shyn-labs/homebrew-tap/releases/download/v0.6.3-alpha/shyn.mcpb`
- SHA-256: `6b8ae67921ed1e5f5a159381d66bf43abd6bbbd692a9764b2b052cf9c926fbfb`

### Verify on macOS / Linux

```bash
echo "6b8ae67921ed1e5f5a159381d66bf43abd6bbbd692a9764b2b052cf9c926fbfb  shyn.mcpb" | shasum -a 256 -c
```

### Verify on Windows (PowerShell)

```powershell
(Get-FileHash -Algorithm SHA256 .\shyn.mcpb).Hash -eq "6b8ae67921ed1e5f5a159381d66bf43abd6bbbd692a9764b2b052cf9c926fbfb"
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-02 (score 50, 0)

- [security] Stability: 0.97 → pass

### 2026-11-01 (score 50, 0)

- [functional] Stability: pass → 0.97

### 2026-10-26 (score 50, 0)

- [security] Stability: 0.97 → pass

### 2026-10-25 (score 50, +1)

No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-23 (score 49, +1)

No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-21 (score 48, +1)

No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-19 (score 47, +1)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-17 (score 46, +1)

No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (6)

### `search_memory` (~137 tokens)

Search the user's local memory (files, notes, saved facts) with hybrid keyword+semantic retrieval. The workhorse tool. For vague questions, call recent_activity first to orient, then search with a sharpened query. Resolve relative dates ('last Tuesday') into ISO timestamps yourself via time_from/time_to (ISO 8601 date or datetime, offsets allowed).

Input parameters:

- `limit` (integer)
- `query` (string, required)
- `sources` (array)
- `time_from` (string): ISO 8601 date or datetime, offsets allowed
- `time_to` (string): ISO 8601 date or datetime, offsets allowed

### `recent_activity` (~227 tokens)

Enumerate documents in a time window, in timestamp order. Call this FIRST for vague or broad questions ('what was I working on') to orient, then drill in with search_memory. Unlike search_memory this is NOT ranked by relevance — it returns everything in the window, so it is the right tool for reconstructing a specific period ('what did I do between 13:00 and 16:00 yesterday'). Use time_from/time_to for an explicit past window (ISO 8601, offsets allowed) and order:'asc' to replay a day forwards; `hours` is a lookback-from-now shorthand. Page with limit/offset — the reply says so when more rows remain.

Input parameters:

- `hours` (integer)
- `limit` (integer)
- `offset` (integer)
- `order` (string): asc replays a window forwards; default desc
- `sources` (array)
- `time_from` (string): ISO 8601 date or datetime, offsets allowed
- `time_to` (string): ISO 8601 date or datetime, offsets allowed

### `get_document` (~134 tokens)

Read a whole document from memory by uri or doc_id — search_memory returns only matching excerpts, so use this when you need the complete text (a full meeting transcript, a whole note). Both uri and doc_id come from search_memory and recent_activity results. Long documents are truncated with an offset footer; call again with that offset to page through the rest.

Input parameters:

- `doc_id` (integer)
- `max_chars` (integer)
- `offset` (integer): character offset into the document
- `source` (string): disambiguates a uri that exists under more than one source
- `uri` (string)

### `remember` (~36 tokens)

Save an explicit fact or note to the user's local memory for future recall.

Input parameters:

- `content` (string, required)
- `tags` (array)

### `forget` (~110 tokens)

Permanently delete documents from memory (purged from disk, not soft-deleted). Requires confirm: true — always ask the user before confirming. time_from/time_to accept ISO 8601 date or datetime, offsets allowed.

Input parameters:

- `confirm` (boolean, required)
- `doc_id` (integer)
- `source` (string)
- `time_from` (string): ISO 8601 date or datetime, offsets allowed
- `time_to` (string): ISO 8601 date or datetime, offsets allowed

### `memory_status` (~44 tokens)

Daemon health: document/vector counts, pending embeddings, model download progress. modelLoaded=false with modelDownloaded=true just means the model is idle-unloaded; it loads on demand.

## Diagnostics

Captured diagnostic sections: Provenance. The full working is on the page: https://verifymcp.io/servers/day-shyn-shyn/https-github-com-shyn-labs-homebrew-tap-releases-download-v0-5-15-alpha-shyn-mcp#diagnostics

## Score history

- 2026-11-05: 50
- 2026-11-04: 50
- 2026-11-03: 50
- 2026-11-02: 50
- 2026-11-01: 50
- 2026-10-31: 50
- 2026-10-30: 50
- 2026-10-29: 50
- 2026-10-28: 50
- 2026-10-27: 50
- 2026-10-26: 50
- 2026-10-25: 50
- 2026-10-24: 49
- 2026-10-23: 49
- 2026-10-22: 48
- 2026-10-21: 48
- 2026-10-20: 47
- 2026-10-19: 47
- 2026-10-18: 46
- 2026-10-17: 46
- 2026-10-16: 45
- 2026-10-15: 45
- 2026-10-14: 44
- 2026-10-13: 44
- 2026-10-12: 43
- 2026-10-10: 43
- 2026-10-08: 42
- 2026-10-06: 41
- 2026-10-04: 40
- 2026-10-03: 39

## Common questions

### What is the shyn MCP server?

shyn is an MCP server listed in the public MCP registry as day.shyn/shyn. Local-first ambient memory for your Mac, pages, meetings, notes, encrypted on-device. This page covers its MCPB bundle (https://github.com/shyn-labs/homebrew-tap/releases/download/v0.6.3-alpha/shyn.mcpb).

### Is the shyn MCP server safe to use?

shyn scores 50 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the shyn MCP server expose?

shyn exposes 6 tools: search_memory, recent_activity, get_document, remember, forget, memory_status. Their descriptions and schemas cost roughly 688 tokens of context every time the server is loaded.

### What did VerifyMCP test on the shyn MCP server?

VerifyMCP ran 12 checks on shyn, covering Source repository, Provenance, License, Maintenance and 8 more. 4 items could not be completed, a gap on our side rather than a finding about shyn: Malware scan, Known CVEs, Install scripts and Dependency health. One category scores 0 for that reason, because we only credit what we can confirm. Endpoint Security and Transport & Reachability do not apply to an MCPB bundle, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Repository: https://github.com/shyn-labs/shyn
- Website: https://shyn.day/
- Changelog RSS feed: https://verifymcp.io/servers/day-shyn-shyn/https-github-com-shyn-labs-homebrew-tap-releases-download-v0-5-15-alpha-shyn-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/day-shyn-shyn/https-github-com-shyn-labs-homebrew-tap-releases-download-v0-5-15-alpha-shyn-mcp/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/day-shyn-shyn/https-github-com-shyn-labs-homebrew-tap-releases-download-v0-5-15-alpha-shyn-mcp.json
- HTML version of this page: https://verifymcp.io/servers/day-shyn-shyn/https-github-com-shyn-labs-homebrew-tap-releases-download-v0-5-15-alpha-shyn-mcp