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ntfy-mcp-server MCP Server

Send, manage, and replay ntfy push notifications via MCP.

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

Pod has not dialled ntfy-mcp-server yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

Connect

Published as ntfy-mcp-server on npm. Runs locally.

Known issues

23 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.

Most discussed

bug(ntfy-service): upstream ntfy error text never reaches content[], and is discarded on classified failures

Server version

2.1.1

mcp-ts-core version

0.10.6

Runtime

Bun

Runtime version

Bun 1.3.14

Transport

http

Description

ntfy returns a descriptive JSON error body on every 4xx — an error string plus a docs link pointing at the exact parameter that was rejected. None of it reaches the agent through content[], and classified failures drop it from structuredContent too.

Unclassified errors keep the body in structuredContent.error.data.body, but

Read the thread · 2026-07-28 · closed · 3 comments

feat(consent): elicit before high-impact notification actions

ntfy_manage_message is marked destructiveHint: true, but the handler calls NtfyService.manage() directly with no ctx.elicit confirmation. ntfy_publish_message can also trigger high-impact side effects (email, call, broadcast actions, and http action buttons) from model-supplied input.

Proposal

Add an elicitation boundary before side effects where a mistaken or prompt-injected tool call is meaningfully disruptive.

Scope

Read the thread · 2026-06-28 · closed · 3 comments

feat(ntfy-service): SSRF protection for base_url override

Use case

The base_url override on ntfy_publish_message, ntfy_manage_message, and ntfy_fetch_messages accepts any string passing z.url() — no scheme allowlist, no host filtering. When the server runs publicly (Streamable HTTP transport, MCP_AUTH_MODE=none), unauthenticated callers can supply private/loopback/link-local URLs that the server then dereferences via fetch. This is a server-side request forgery surface.

Reachable from the host running the server:

Read the thread · 2026-05-10 · closed · 3 comments

feat(ntfy_fetch_messages): limit drops the newest messages instead of the oldest

ntfy_fetch_messages truncates with notifications.slice(0, input.limit), keeping the oldest N of the matching window. The default lookback is since: 10m with limit: 20, so on a busy topic the most common question the tool exists to answer — "did my recent notification land?" — comes back with the start of the window and the recent messages dropped.

Related: #20

Proposal

Keep the newest limit messages (slice(-limit)), matching what the ntfy://{topic} resource does, and stat

Read the thread · 2026-07-30 · closed · 2 comments

feat(schema): replace the priority literal union with an enum so validation errors stay readable

Use case

PrioritySchema is built as z.union([z.literal(1), … z.literal(5)]). It serializes to a five-branch anyOf of const values instead of a plain enum, and a wrong value produces an invalid_union dump listing all five branches — roughly 40 lines of JSON for a one-character mistake.

Calling ntfy_publish_message with priority: 9 returns:

MCP error -32602: Input validation error: Invalid arguments for tool ntfy_publish_message: [
  { "code": "invalid_union", "errors": [ 

[Read the thread](https://github.com/cyanheads/ntfy-mcp-server/issues/21) · 2026-07-28 · closed · 2 comments

### Most recent

### fix(config): pin MCP_SESSION_MODE to stateful — the image ships stateless and breaks the confirmation gate for v1 HTTP clients

`Dockerfile` sets `ENV MCP_SESSION_MODE="stateless"`, but `.env.example` carries a commented `# MCP_SESSION_MODE=stateful`, whose comment documents the value set as `stateful | stateless (default: stateful)`. The container and the same code run via `bunx`, `npm start`, or from source therefore resolve to different session modes. `README.md` disagrees with both, listing the default as `auto` — three surfaces, three answers.

For this server the container is the one that is wrong.

Related: cyanhe

[Read the thread](https://github.com/cyanheads/ntfy-mcp-server/issues/31) · 2026-08-22 · open · 0 comments

### feat(config): default MCP_SESSION_MODE to stateful across env, Docker, and src

`Dockerfile` sets `ENV MCP_SESSION_MODE="stateless"`, `.env.example` carries a commented `# MCP_SESSION_MODE=stateful`, and `README.md` documents the default as `auto`. The same code therefore runs stateless in the container and stateful everywhere else — `bunx`, `npm start`, or from source — since the framework schema defaults to `auto` and `auto` resolves to `stateful`.

The `.env.example` comment is also factually wrong. It reads `stateful | stateless (default: stateful)`, omitting `auto`, wh

[Read the thread](https://github.com/cyanheads/ntfy-mcp-server/issues/30) · 2026-08-22 · open · 0 comments

### feat(ntfy_publish_message): add structured recovery for invalid delay

### Use case

`ntfy_publish_message` preserves ntfy's invalid-delay explanation on both response surfaces, but the failure has no stable `data.reason` and no recovery hint naming the accepted delay forms. One of ntfy's three delay rejections is also actively misrouted today.

ntfy answers a bad `delay` with one of three errors, all HTTP 400:

| Code | Upstream error | Current classification |
|:---|:---|:---|
| 40004 | `invalid delay parameter: unable to parse delay` | unclassified — bubbles to 

[Read the thread](https://github.com/cyanheads/ntfy-mcp-server/issues/29) · 2026-08-17 · open · 0 comments

### bug(ntfy_manage_message): idempotentHint conflicts with emitted events

### Server version

2.3.0

### mcp-ts-core version

0.11.0

### Runtime

Bun

### Runtime version

Bun 1.3.14

### Transport

HTTP (Streamable HTTP)

### Description

`ntfy_manage_message` advertises `idempotentHint: true`. `@modelcontextprotocol/sdk` 1.29.0 defines that hint as "calling the tool repeatedly with the same arguments will have no additional effect on its environment", and it is meaningful on this tool because `readOnlyHint` is unset (defaults to `false`).

Clearing and deleting are

[Read the thread](https://github.com/cyanheads/ntfy-mcp-server/issues/25) · 2026-08-17 · open · 0 comments

### bug(ntfy_fetch_messages): empty filters silently widen the query

### Server version

2.3.0

### mcp-ts-core version

0.11.0

### Runtime

Bun

### Runtime version

Bun 1.3.14

### Transport

HTTP (Streamable HTTP)

### Description

`since` carries a schema default of `10m`, but a Zod `.default()` only fires on `undefined`. An explicit `""` passes validation, is then dropped from the upstream query by a truthiness check in `NtfyService.fetch()`, and ntfy applies its own poll default of `since=all`. The documented `10m` guardrail is silently replaced by the ent

[Read the thread](https://github.com/cyanheads/ntfy-mcp-server/issues/26) · 2026-08-17 · open · 0 comments

### bug(ntfy_fetch_messages): hard cap drops messages without a retrieval path

### Server version

2.3.0

### mcp-ts-core version

0.11.0

### Runtime

Bun

### Runtime version

Bun 1.3.14

### Transport

HTTP (Streamable HTTP)

### Description

`ntfy_fetch_messages` keeps the newest `limit` matches and drops the older head, with `limit` capped at 100. Once more than 100 messages match, the dropped head is unreachable: the tool exposes no offset or cursor, and every path the truncation notice suggests is a dead end at the cap.

ntfy has no upstream lever for this either. I

[Read the thread](https://github.com/cyanheads/ntfy-mcp-server/issues/27) · 2026-08-17 · open · 0 comments

### bug(formatting): plain ntfy text is interpreted as Markdown in content[]

### Server version

2.3.0

### mcp-ts-core version

0.11.0

### Runtime

Bun

### Runtime version

Bun 1.3.14

### Transport

HTTP (Streamable HTTP)

### Description

`format()` in `ntfy_publish_message` and `ntfy_fetch_messages` interpolates upstream-controlled strings straight into Markdown `content[]` text, so a message body becomes formatting instructions instead of data. The interpolated values are `title`, `message`, `click` (rendered as `[url](url)`), `attachment.name` / `url` / `type` (r

[Read the thread](https://github.com/cyanheads/ntfy-mcp-server/issues/28) · 2026-08-17 · open · 0 comments

[See all 18 reports Pod holds for ntfy-mcp-server](/mcp/ntfy-mcp-server/issues) — of 23 qualified upstream.

## Firsthand observations

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