Zyberno stock valuation
REMOTE · API.ZYBERNO.COM · SCANNED SEP 22
Brina Gap valuation, screener and market score for US-listed stocks. SEC data, free, no key.
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 Security74
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- 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 Usability59
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 3225 tokens (~537/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- 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 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
How do I install the Zyberno stock valuation MCP server?
Zyberno stock valuation is a hosted endpoint at https://api.zyberno.com/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 · api.zyberno.com
claude mcp add --transport http com-zyberno-zyberno 'https://api.zyberno.com/mcp'
{
"mcpServers": {
"com-zyberno-zyberno": {
"url": "https://api.zyberno.com/mcp"
}
}
} {
"servers": {
"com-zyberno-zyberno": {
"type": "http",
"url": "https://api.zyberno.com/mcp"
}
}
} [mcp_servers.com-zyberno-zyberno] url = "https://api.zyberno.com/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-zyberno-zyberno": {
"type": "remote",
"url": "https://api.zyberno.com/mcp",
"enabled": true
}
}
} openclaw mcp add com-zyberno-zyberno --url 'https://api.zyberno.com/mcp' --transport streamable-http
mcp_servers:
com-zyberno-zyberno:
url: "https://api.zyberno.com/mcp" {
"McpServers": {
"com-zyberno-zyberno": {
"Transport": "http",
"Url": "https://api.zyberno.com/mcp"
}
}
} assistant mcp add com-zyberno-zyberno -t streamable-http -u 'https://api.zyberno.com/mcp'
{
"mcpServers": {
"com-zyberno-zyberno": {
"type": "http",
"url": "https://api.zyberno.com/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.
- 3 Sept 26 +14
- Stability: fail → pass ▲ security
- 26 Aug 26 +2
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 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
- 6 Aug 26 0
- Tool “get_stock_valuation” rewrote its description, which is the text the model reads security
- 4 Aug 26 0
- Stability: 0.27 → fail ▼ security
- Tool “get_brina_gap_movers” was removed ▼ security
- Tool “analyze_stock” was removed ▼ security
- Tool “get_market_valuation” was removed ▼ security
- Authorization: unverified → partial ▲ security
- The server rewrote its instructions, which are the text every model session reads security
- Schema quality: pass → fail ▼ functional
- MCP protocol: fail → pass ▲ functional
- MCP protocol version: 2025-06-18 → 2026-07-28 functional
- Server version: 1.0.0 → 2.0.0 functional
- New tool “calculate_dcf_value” functional
- New tool “get_stock_valuation” functional
- New tool “get_us_market_valuation” functional
- New tool “list_flagged_stocks” functional
- New tool “screen_stocks” functional
- New tool “simulate_portfolio_outcomes” functional
- “screen_stocks” reworded the description of “momentum_12_1_max” cosmetic
- “screen_stocks” reworded the description of “momentum_12_1_min” cosmetic
- 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
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 22 Sept 2026 · Probed https://api.zyberno.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=api.zyberno.com | CN=YE1,O=Let's Encrypt,C=US | 10 Aug 2026 | 8 Nov 2026 | ECDSA 256 | ECDSA-SHA384 | 672096aff0666c17f462eae56cb8195f64b |
| SANs: api.zyberno.com | ||||||
| CN=YE1,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 5ddd70dd31f801c85c186a7a04b80afe |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of api.zyberno.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| zyberno.com. | 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://api.zyberno.com/mcp | Verified | 200 | |
| http (plaintext) | http://api.zyberno.com/mcp | HTTPS enforced | 301 | https://api.zyberno.com/mcp |
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 →
calculate_dcf_value Two-stage discounted cash flow under assumptions you supply ~413
Runs a two-stage discounted cash flow on numbers you provide and returns the fair value per share, the margin of safety against the price you gave, and how much of the value sits in the terminal stage. Cash flow grows at your growth rate for the stage-one years, then forever at your terminal rate, with the terminal value from the Gordon Growth Model discounted back over the stage-one years. Use when the user wants to value a company under their own assumptions, test how sensitive a valuation is to the discount or growth rate, or check the arithmetic of a DCF they are building. Do not use it to look up what a company is worth on Zyberno's own assumptions, which is get_stock_valuation and uses a different, fade-based model; the two will not agree and are not meant to. This computes your assumptions, it does not endorse them. The output is arithmetic, and a two-stage DCF is highly sensitive to the discount and terminal rates, so treat a single result as one point rather than an answer.
| Name | Type | Req | Description |
|---|---|---|---|
| cash_flow_per_share | number | yes | Starting free cash flow or owner earnings PER SHARE, not the company total. This is the base the projection grows from. |
| current_stock_price | number | yes | Current share price, used only to compute the margin of safety against the fair value. |
| discount_rate | number | yes | Discount rate (required return or WACC) in percent. Pass 10 for 10 percent. Must be greater than the terminal growth rate. |
| growth_rate | number | yes | Annual cash flow growth during the first stage, in percent. Pass 8 for 8 percent. Range -20 to 100. |
| growth_years | integer | yes | Length of the high-growth first stage, in years. |
| terminal_growth_rate | number | yes | Perpetual growth rate after the first stage, in percent. Pass 2.5 for 2.5 percent. Range -5 to 15, and must be below the discount rate. |
No output schema declared.
No examples provided.
get_stock_valuation Valuation record for one US-listed company ~308
Returns Zyberno's stored valuation record for a single US-listed company: Margin of Safety against a discounted cash flow estimate, the Brina Gap (the growth rate the business can fund from its own returns minus the growth rate its current price implies), the Brina Matrix quadrant those two produce together, the Zyberno quality score, and trailing twelve month fundamentals from SEC filings. Use when the user names a company or ticker and wants to know how it is valued. This is also the tool for questions phrased without the framework's vocabulary: what growth rate is priced into a stock, what the market expects from a company, what a reverse DCF on it implies, whether its growth expectations look too high or too low, or whether a cheap-looking stock is actually a value trap. Do not use it to find or rank companies (use screen_stocks), to retrieve the published monthly lists (use list_flagged_stocks), or for price quotes, charts, news, analyst ratings, earnings dates, or non-US listings, none of which this server holds. Records refresh on a rolling cycle of roughly two weeks per company, so figures can lag a company's newest filing for part of that cycle. Every response states the date its data was computed.
| Name | Type | Req | Description |
|---|---|---|---|
| symbol | string | yes | Ticker symbol of a US-listed company, for example AAPL, MSFT, or BRK.B. Case insensitive. Non-US listings and most OTC ADRs are not covered and return no data. |
No output schema declared.
No examples provided.
get_us_market_valuation How expensive the whole US equity market is against its own history ~138
Returns the Zyberno Market Valuation Score, a single 0 to 100 reading of how expensive the US equity market is relative to its own history, combining the Buffett Indicator, the Shiller PE, the 10 year minus 2 year Treasury curve and the Baa credit spread. Use for questions about the market as a whole, overall valuation levels, or whether US stocks broadly look expensive or cheap right now. Do not use it for any individual company, sector, or index price level, none of which it measures. The score measures present valuation against history. It is not a forecast and not a market timing signal.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
list_flagged_stocks The two published monthly Brina Matrix lists ~172
Returns the two lists Zyberno publishes each month from one fixed screen. The first holds companies where the Margin of Safety and the Brina Gap both read as undervalued, labelled Double Discount. The second holds companies that look cheap on trailing earnings power while the Brina Gap reads negative, labelled value trap. Takes no parameters: the thresholds, sector exclusions and ranking are fixed and match the published page. Use when the user asks what the framework currently flags, or asks about the Double Discount or value trap lists by name. Do not use it for custom criteria (use screen_stocks) or for one named company (use get_stock_valuation). Both labels describe where a company sits on two valuation measures at one moment. They are screen output, not recommendations, and neither label forecasts a return.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
screen_stocks Find US-listed companies by valuation and quality criteria ~1,502
Searches Zyberno's database of roughly 10,000 US-listed companies and returns those matching the numeric criteria you supply, ranked by a field you choose. All metrics are computed from SEC filings. Use when the user wants to find, filter, rank, or count companies by their characteristics rather than asking about one company by name. Omit any filter you do not want applied; omitting all of them ranks the whole covered universe. Do not use it for a single known ticker (use get_stock_valuation), and do not use it to reconstruct the published monthly lists, which apply their own fixed thresholds, sector exclusions and curation (use list_flagged_stocks). Returns at most 25 companies plus the total number that matched, so a query that is too broad or too narrow reports its own breadth.
| Name | Type | Req | Description |
|---|---|---|---|
| brina_gap_max | number | – | Maximum Brina Gap in percentage points. Use a negative value to isolate companies whose price implies more growth than fundamentals support. |
| brina_gap_min | number | – | Minimum Brina Gap in percentage points. Positive means the growth the business can fund exceeds the growth its price implies; negative means the price implies faster growth than the fundamentals supp… |
| current_ratio_min | number | – | Minimum current ratio. Pass 1.5 for 1.5x. |
| debt_to_equity_max | number | – | Maximum debt to equity ratio, as a ratio not a percent. Pass 1.5 for 1.5x. |
| earnings_yield_min | number | – | Minimum earnings yield in percent, the inverse of P/E. Pass 8 for 8 percent. |
| eps_cagr_3yr_min | number | – | Minimum 3 year diluted EPS compound annual growth rate in percent. |
| eps_sue_max | number | – | Maximum standardised earnings surprise (SUE), range -4 to +4. |
| eps_sue_min | number | – | Minimum standardised earnings surprise (SUE), a winsorized z-score bounded to the range -4 to +4. Positive means the latest reported earnings beat the trend-based expectation. Pass 1 for a one standa… |
| ev_ebitda_ratio_max | number | – | Maximum enterprise value to EBITDA ratio. |
| exchange | string | – | Restrict to one listing venue. |
| fcf_yield_min | number | – | Minimum free cash flow yield in percent. Pass 5 for 5 percent. |
| fundamental_growth_rate_max | number | – | Maximum fundamentally fundable growth rate in percent. |
| fundamental_growth_rate_min | number | – | Minimum fundamentally fundable growth rate in percent, defined as ROIC times reinvestment rate. This is the first half of the Brina Gap on its own. |
| gross_margin_ttm_min | number | – | Minimum trailing twelve month gross margin in percent. |
| interest_coverage_ratio_min | number | – | Minimum interest coverage ratio, operating income over interest expense. |
| limit | integer | – | How many companies to return, 1 to 25. Defaults to 10. The total number that matched is reported regardless. |
| margin_of_safety_max | number | – | Maximum Margin of Safety in percentage points. Pass 10 for 10 percent. |
| margin_of_safety_min | number | – | Minimum Margin of Safety in percentage points, where positive means the price sits below the discounted cash flow estimate. Pass 10 for 10 percent, not 0.1. Negative values are allowed. |
| market_cap_category | string | – | Restrict by size band, as an alternative to explicit market cap bounds. Bands are micro under $300M, small $300M to $2B, mid $2B to $10B, large $10B to $200B, mega $200B and above. Note that large ex… |
| market_cap_max | number | – | Maximum market capitalisation in US dollars. |
| market_cap_min | number | – | Minimum market capitalisation in US dollars, for example 2000000000 for 2 billion. |
| momentum_12_1_max | number | – | Maximum 12 minus 1 price momentum in percent. Pass a negative value to isolate fallers. |
| momentum_12_1_min | number | – | Minimum 12 minus 1 price momentum in percent: total return including dividends over the last 12 months, skipping the most recent month. Pass 20 for 20 percent, or -30 for a 30 percent fall. Values ar… |
| momentum_12_1_pct_max | number | – | Maximum cross-sectional momentum percentile, 0 to 100. |
| momentum_12_1_pct_min | number | – | Minimum cross-sectional momentum percentile, 0 to 100, where 100 is the strongest momentum in the covered universe. Prefer this over the raw percentage when the user asks for strong or weak momentum… |
| net_margin_ttm_min | number | – | Minimum trailing twelve month net margin in percent. |
| operating_margin_ttm_min | number | – | Minimum trailing twelve month operating margin in percent. |
| owner_earnings_yield_min | number | – | Minimum owner earnings yield in percent. Owner earnings is the cash figure the discounted cash flow behind Margin of Safety is built on. |
| pb_ratio_max | number | – | Maximum price to book ratio. |
| pe_ratio_max | number | – | Maximum trailing price to earnings ratio. Companies with no meaningful P/E, including loss makers, are excluded when this is set. |
| peg_ratio_max | number | – | Maximum PEG ratio, price to earnings divided by growth. |
| price_to_52w_high_max | number | – | Maximum ratio of current price to the 52 week high. Pass 0.7 to find stocks at least 30 percent below their high. |
| price_to_52w_high_min | number | – | Minimum ratio of current price to the 52 week high, where 1.0 means the stock is sitting at its high. Pass 0.95 for within 5 percent of the high. |
| revenue_cagr_3yr_min | number | – | Minimum 3 year revenue compound annual growth rate in percent. |
| revenue_yoy_growth_min | number | – | Minimum year over year revenue growth in percent. |
| roe_min | number | – | Minimum return on equity in percent. |
| roic_min | number | – | Minimum return on invested capital in percent. Pass 15 for 15 percent. |
| sector | string | – | Restrict to one sector, spelled as Zyberno stores it, for example Technology, Healthcare, Industrials, Energy, Consumer Cyclical, Financial Services, Real Estate, Utilities, Basic Materials, Communic… |
| sort_by | string | – | Field to rank the matches by, largest first. Defaults to market_cap. |
| zyberno_score_min | number | – | Minimum Zyberno quality score, on a 0 to 100 scale combining profitability, balance sheet strength and earnings consistency. |
No output schema declared.
No examples provided.
simulate_portfolio_outcomes Monte Carlo distribution of portfolio outcomes ~411
Runs a Monte Carlo simulation over a portfolio balance and returns the distribution of possible end values: percentiles, mean, median, and if you give a goal amount, the share of simulated paths that reached it. Returns are drawn from a normal distribution using the expected return and volatility you supply. Use when the user asks about the range or probability of outcomes rather than a single projected number, for example the odds of reaching a target, or how much volatility widens the spread. Do not use it to value a company (use calculate_dcf_value or get_stock_valuation), and do not use it for retirement withdrawal, tax, or drawdown-sequencing questions, which it does not model. The simulation propagates the assumptions you give it. Normally distributed returns understate real market tail risk, and the output is a property of the inputs, not a prediction about any real portfolio.
| Name | Type | Req | Description |
|---|---|---|---|
| annual_volatility_pct | number | yes | Annual standard deviation of returns in percent. Pass 15 for 15 percent. Broad equity indices have historically run in the mid teens. |
| current_balance | number | yes | Starting portfolio value in currency units. |
| expected_annual_return_pct | number | yes | Expected average annual return in percent. Pass 7 for 7 percent. |
| fee_rate_pct | number | – | Annual fee drag in percent, for example a fund expense ratio. Defaults to 0. |
| goal_amount | number | – | Optional target end value. When set, the result reports the share of simulated paths that finished at or above it. |
| inflation_rate_pct | number | – | Annual inflation in percent. When set above 0, results are expressed in today's purchasing power. Defaults to 0. |
| monthly_contribution | number | – | Amount added every month. Defaults to 0. |
| simulations | integer | – | Number of simulated paths. Defaults to 10000. More paths stabilise the tails and cost more time. |
| years | integer | yes | How many years to simulate forward. |
No output schema declared.
No examples provided.
What is the Zyberno stock valuation MCP server?
Zyberno stock valuation is an MCP server listed in the public MCP registry as com.zyberno/zyberno. Brina Gap valuation, screener and market score for US-listed stocks. SEC data, free, no key. This page covers its hosted endpoint (https://api.zyberno.com/mcp).
Is the Zyberno stock valuation MCP server safe to use?
Zyberno stock valuation scores 82 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 Zyberno stock valuation MCP server expose?
Zyberno stock valuation exposes 6 tools: calculate_dcf_value, get_stock_valuation, get_us_market_valuation, list_flagged_stocks, screen_stocks, simulate_portfolio_outcomes. Their descriptions and schemas cost roughly 2,944 tokens of context every time the server is loaded.
Does the Zyberno stock valuation MCP server require authentication?
No. We connected to Zyberno stock valuation without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Zyberno stock valuation MCP server still maintained?
Zyberno stock valuation is still listed as active in the MCP registry. We last reached this channel on 22 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.