ContextOverflow
REMOTE · CONTEXTOVERFLOW.ORG · SCANNED SEP 25
Describe what's going wrong with your AI; get the named technique both of you can read. No auth.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security46
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 5 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability84
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 369 tokens (~73/item across 5 items; 5 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the ContextOverflow MCP server?
ContextOverflow is a hosted endpoint at https://contextoverflow.org/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · contextoverflow.org
claude mcp add --transport http org-contextoverflow-library 'https://contextoverflow.org/mcp'
{
"mcpServers": {
"org-contextoverflow-library": {
"url": "https://contextoverflow.org/mcp"
}
}
} {
"servers": {
"org-contextoverflow-library": {
"type": "http",
"url": "https://contextoverflow.org/mcp"
}
}
} [mcp_servers.org-contextoverflow-library] url = "https://contextoverflow.org/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"org-contextoverflow-library": {
"type": "remote",
"url": "https://contextoverflow.org/mcp",
"enabled": true
}
}
} openclaw mcp add org-contextoverflow-library --url 'https://contextoverflow.org/mcp' --transport streamable-http
mcp_servers:
org-contextoverflow-library:
url: "https://contextoverflow.org/mcp" {
"McpServers": {
"org-contextoverflow-library": {
"Transport": "http",
"Url": "https://contextoverflow.org/mcp"
}
}
} assistant mcp add org-contextoverflow-library -t streamable-http -u 'https://contextoverflow.org/mcp'
{
"mcpServers": {
"org-contextoverflow-library": {
"type": "http",
"url": "https://contextoverflow.org/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 25 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Aug 26 0
- Stability: 0.97 → pass security
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 31 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 27 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Jul 26 0
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 25 Sept 2026 · Probed https://contextoverflow.org/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=contextoverflow.org | CN=WE1,O=Google Trust Services,C=US | 16 Sept 2026 | 15 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | 31e06bd66c320e890eec01fcd6ef0b02 |
| SANs: contextoverflow.org | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of contextoverflow.org. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| org. | present | 26974 | 8 | Verified |
| contextoverflow.org. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://contextoverflow.org/mcp | Verified | 200 | |
| http (plaintext) | http://contextoverflow.org/mcp | Inconclusive | 405 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
apply_technique Run a technique now ~55
The minimal executable scaffold: steps (or self-diagnostic for anti-patterns), the narration line to say to your human, and the verification check that proves it worked.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | Technique id to apply |
No output schema declared.
No examples provided.
classify_intent Match a problem description to techniques ~77
Describe what's going wrong — your human's complaint, or a failure you notice in your own behavior — and get the matching techniques. Deterministic matching; if the description fits two problems it returns one clarifying question instead of guessing.
| Name | Type | Req | Description |
|---|---|---|---|
| description | string | yes | The problem as experienced, in plain words — symptoms, not solution guesses |
No output schema declared.
No examples provided.
find_technique Look up a technique by name ~58
Direct lookup by technique id or name, for when you already know what you want. To match by symptom, use classify_intent instead.
| Name | Type | Req | Description |
|---|---|---|---|
| query | string | yes | Technique id (kebab-case) or name, exact or approximate |
No output schema declared.
No examples provided.
get_technique Learn a technique ~66
A technique's mechanism, agent instructions, narration template, verification, and failure modes — the agent-tailored slice. The full human page is linked, not inlined.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | Technique id, e.g. from classify_intent or find_technique |
No output schema declared.
No examples provided.
list_categories List the eight problem categories ~34
The eight thinking-failure problems ContextOverflow covers, phrased the way a human experiences them. Start here to see what exists.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
What is the ContextOverflow MCP server?
ContextOverflow is an MCP server listed in the public MCP registry as org.contextoverflow/library. Describe what's going wrong with your AI; get the named technique both of you can read. No auth. This page covers its hosted endpoint (https://contextoverflow.org/mcp).
Is the ContextOverflow MCP server safe to use?
ContextOverflow scores 76 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 ContextOverflow MCP server expose?
ContextOverflow exposes 5 tools: list_categories, classify_intent, find_technique, get_technique, apply_technique. Their descriptions and schemas cost roughly 290 tokens of context every time the server is loaded.
Does the ContextOverflow MCP server require authentication?
No. We connected to ContextOverflow without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the ContextOverflow MCP server still maintained?
ContextOverflow is still listed as active in the MCP registry. We last reached this channel on 25 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.