# prinfer (npm · prinfer)

TypeScript inferred types, completions and type errors for AI coding agents

- Trust score: 73/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `prinfer`: 73/100 (this document), [markdown](https://verifymcp.io/servers/clockblocker-prinfer/prinfer.md), [page](https://verifymcp.io/servers/clockblocker-prinfer/prinfer)

## Channel facts

- Registry: `npm`
- Package: `prinfer`
- Version: `3.4.0`
- Transport: `stdio`

## 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**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 0 of 25 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 13/100
  - Repository check failed: the declared repository URL redirects; it must resolve directly.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Maintenance check failed: the publisher has marked this version as deprecated on the registry, telling users to stop installing it.
  - Security-disclosure policy not yet verified: we couldn't inspect the source repository.
- **Schema Quality & AI Usability**: 63/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1237 tokens (~206/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 77/100
  - Stability observed for 23 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **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 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

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

prinfer runs locally as an npm package, launched with npx -y prinfer. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add clockblocker-prinfer -- npx -y prinfer
```

### Cursor

```json
{
  "mcpServers": {
    "clockblocker-prinfer": {
      "command": "npx",
      "args": [
        "-y",
        "prinfer"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "clockblocker-prinfer": {
      "command": "npx",
      "args": [
        "-y",
        "prinfer"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add clockblocker-prinfer -- npx -y prinfer
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "clockblocker-prinfer": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "prinfer"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add clockblocker-prinfer --command npx --arg -y --arg prinfer
```

### Hermes

```yaml
mcp_servers:
  clockblocker-prinfer:
    command: "npx"
    args: ["-y", "prinfer"]
```

### Netclaw

```json
{
  "McpServers": {
    "clockblocker-prinfer": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "prinfer"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add clockblocker-prinfer -t stdio -c npx -a -y prinfer
```

### Other

```json
{
  "mcpServers": {
    "clockblocker-prinfer": {
      "command": "npx",
      "args": [
        "-y",
        "prinfer"
      ]
    }
  }
}
```

## 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.

### 2026-11-05 (score 73, +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.

### 2026-11-03 (score 72, +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.

### 2026-11-01 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 60 to 63. That category is still filling its 30-day observation window: 18 days of observed history at the previous scan, 19 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 70, 0)

- [functional regression] Security disclosure: fail → unverified

### 2026-10-30 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-25 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-23 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (6)

### `hover_by_name` (~226 tokens)

The type TypeScript infers for a named variable, function, parameter, property, or type. Use before writing an annotation, when unsure what a generic or call resolves to, or instead of reading .d.ts files.

Input parameters:

- `backend`: Default typescript7; retry with typescript6 if it fails or looks wrong
- `file` (string, required): TS/JS file: absolute, or relative to the server's cwd
- `full` (boolean): Untruncated types (no "... 12 more ..."), all overloads
- `include_cost` (boolean): Count type instantiations; typescript6 only
- `include_docs` (boolean): Also return JSDoc/TSDoc
- `line` (integer): 1-based line, to pick among repeated names
- `max_chars` (integer): Text cap per type (default 4000 chars; 0: none)
- `name` (string, required): Symbol name, e.g. "createHandler"
- `project` (string): tsconfig.json; default: the nearest one above file

Output parameters:

- `error` (object)
- `ok` (boolean)
- `result` (object)
- `version`

### `hover` (~257 tokens)

The type at a token on a line, like an editor hover; generic calls show their instantiated types. Use when hover_by_name can't name the token: callback parameters, expressions, repeated names.

Input parameters:

- `backend`: Default typescript7; retry with typescript6 if it fails or looks wrong
- `column` (integer): 1-based column; alternative to text
- `file` (string, required): TS/JS file: absolute, or relative to the server's cwd
- `full` (boolean): Untruncated types (no "... 12 more ..."), all overloads
- `include_cost` (boolean): Count type instantiations; typescript6 only
- `include_docs` (boolean): Also return JSDoc/TSDoc
- `line` (integer, required): 1-based line
- `max_chars` (integer): Text cap per type (default 4000 chars; 0: none)
- `occurrence` (integer): Which match of text on the line (default 1)
- `project` (string): tsconfig.json; default: the nearest one above file
- `text` (string): Token copied from the line, e.g. "useState"; whole identifiers match first. Instead of column

Output parameters:

- `error` (object)
- `ok` (boolean)
- `result` (object)
- `version`

### `batch_hover` (~192 tokens)

Up to 100 hovers in one call, across files. Items: {name, line?}, {line, text, occurrence?}, or {line, column}; failures are per item.

Input parameters:

- `backend`: Default typescript7; retry with typescript6 if it fails or looks wrong
- `file` (string): Shared file for items without one
- `full` (boolean): Untruncated types (no "... 12 more ..."), all overloads
- `include_cost` (boolean): Count type instantiations; typescript6 only
- `include_docs` (boolean): Also return JSDoc/TSDoc
- `max_chars` (integer): Text cap per type (default 4000 chars; 0: none)
- `positions` (array, required): 1-100 lookups
- `project` (string): tsconfig.json; default: the nearest one above file

Output parameters:

- `error` (object)
- `ok` (boolean)
- `result` (object)
- `version`

### `completions` (~163 tokens)

The completions TypeScript offers at a cursor, including string-literal union members. Use to find valid values for an argument, key, or import before writing it. Returns the top 50.

Input parameters:

- `column` (integer, required): 1-based column; the cursor sits before it, e.g. just inside an opening quote
- `file` (string, required): TS/JS file: absolute, or relative to the server's cwd
- `limit` (integer): Max entries (default 50)
- `line` (integer, required): 1-based line
- `prefix` (string): Name prefix, case-insensitive; default: the text left of the cursor; "" lists all
- `project` (string): tsconfig.json; default: the nearest one above file

Output parameters:

- `error` (object)
- `ok` (boolean)
- `result` (object)
- `version`

### `diagnostics` (~116 tokens)

Check one file for type errors without running tsc on the whole project. Call it on each file you edit; the edit is done when none reports an error.

Input parameters:

- `backend`: Default typescript7; retry with typescript6 if it fails or looks wrong
- `file` (string, required): TS/JS file: absolute, or relative to the server's cwd
- `include_suggestions` (boolean): Also report suggestions such as unused variables
- `project` (string): tsconfig.json; default: the nearest one above file

Output parameters:

- `error` (object)
- `ok` (boolean)
- `result` (object)
- `version`

### `annotations` (~88 tokens)

Type annotations in one file that TypeScript would infer anyway (redundant) or that are wider than the inferred type (widening, often an intended contract). Use when reviewing or cleaning up types.

Input parameters:

- `file` (string, required): TS/JS file: absolute, or relative to the server's cwd
- `project` (string): tsconfig.json; default: the nearest one above file

Output parameters:

- `error` (object)
- `ok` (boolean)
- `result` (object)
- `version`

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/clockblocker-prinfer/prinfer#diagnostics

## Score history

- 2026-11-05: 73
- 2026-11-04: 72
- 2026-11-03: 72
- 2026-11-02: 71
- 2026-11-01: 71
- 2026-10-31: 70
- 2026-10-30: 70
- 2026-10-29: 69
- 2026-10-28: 69
- 2026-10-27: 69
- 2026-10-26: 68
- 2026-10-25: 68
- 2026-10-24: 67
- 2026-10-23: 67
- 2026-10-22: 66
- 2026-10-21: 66
- 2026-10-20: 62
- 2026-10-19: 62
- 2026-10-18: 62
- 2026-10-17: 62
- 2026-10-16: 62
- 2026-10-15: 62
- 2026-10-14: 62
- 2026-10-13: 62
- 2026-10-12: 33

## Common questions

### What is the prinfer MCP server?

prinfer is an MCP server listed in the public MCP registry as io.github.clockblocker/prinfer. TypeScript inferred types, completions and type errors for AI coding agents. This page covers its npm package (prinfer).

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

prinfer scores 73 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. 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 prinfer MCP server expose?

prinfer exposes 6 tools: hover_by_name, hover, batch_hover, completions, diagnostics, annotations. Their descriptions and schemas cost roughly 1,042 tokens of context every time the server is loaded.

### Is the prinfer MCP server still maintained?

prinfer is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the prinfer MCP server under?

prinfer declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/prinfer
- Socket report: https://socket.dev/npm/package/prinfer
- Website: https://clockblocker.github.io/prinfer/
- Changelog RSS feed: https://verifymcp.io/servers/clockblocker-prinfer/prinfer.xml
- Changelog JSON feed: https://verifymcp.io/servers/clockblocker-prinfer/prinfer.json
- HTML version of this page: https://verifymcp.io/servers/clockblocker-prinfer/prinfer