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Glama

Server Details

Real-time Amazon prices, product search, 90-day history, AI forecasts, and price drop alerts.

Status
Healthy
Last Tested
Transport
Streamable HTTP
URL

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Usage analytics

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Tool DescriptionsA

Average 3.7/5 across 12 of 12 tools scored. Lowest: 3.1/5.

Server CoherenceA
Disambiguation4/5

Most tools have clearly distinct purposes, though the four get_price_* tools (history, statistics, forecast, drops) operate on similar domains and require careful reading to distinguish. The browse vs search and the two create_*_alert tools are well differentiated.

Naming Consistency5/5

Excellent consistency throughout. All 12 tools use snake_case with a clear verb_noun pattern (browse_by, create_, get_, register_, search_). The prefix grouping (get_price_, create_) makes related tools easy to identify.

Tool Count5/5

12 tools is an ideal count for this domain. The set covers product discovery (search, browse, similar), price intelligence (history, forecast, statistics, drops), alerting (price, stock), and utility (API registration) without bloat or obvious omissions in core functionality.

Completeness3/5

Notable gaps in the alert lifecycle: tools exist to create price and stock alerts, but there are no tools to list existing alerts, update them, or delete them. This creates a dead end where agents cannot manage or verify alert status after creation.

Available Tools

12 tools
browse_by_brandBInspect

Browse Amazon products by brand name. Returns products matching the given brand.

ParametersJSON Schema
NameRequiredDescriptionDefault
brandYesBrand name to search for (e.g. Sony, Apple, Samsung)
limitNoNumber of products to return (1-50). Defaults to 20.
regionNoCountry code (e.g. uk, us, de). Defaults to uk.uk
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure but offers minimal detail. It states 'Returns products matching the given brand' without specifying return format, pagination behavior, error handling for unknown brands, or rate limiting concerns.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences with zero redundancy—first states purpose, second states return behavior. Appropriately brief though additional behavioral context would be justified given the absence of annotations.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Adequate for a simple 3-parameter tool with complete schema coverage. However, given the lack of annotations and output schema, the description could be improved by detailing what product information is returned or how results are ordered.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema fully documents all parameters (brand, limit, region). The description adds no additional parameter semantics beyond what the schema provides, meeting the baseline expectation for high-coverage schemas.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description provides specific verb ('Browse'), clear resource ('Amazon products'), and scope ('by brand name'). It effectively distinguishes from sibling tools like 'browse_by_category' and 'search_products' by explicitly specifying the brand-name filtering mechanism.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

While the description implies usage through the specific mention of 'brand name,' it lacks explicit guidance on when to prefer this over 'search_products' or 'browse_by_category.' No prerequisites (e.g., API key registration) or exclusion criteria are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

browse_by_categoryAInspect

Browse Amazon products by category. Omit category to list all available categories. Provide a category name to get products in that category.

ParametersJSON Schema
NameRequiredDescriptionDefault
limitNoNumber of products to return (1-50). Defaults to 20.
regionNoCountry code (e.g. uk, us, de). Defaults to uk.uk
categoryNoCategory name to browse. Omit to list all available categories.
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so description carries full burden. It successfully discloses the dual-mode behavior (category enumeration vs. product listing), but omits details about return format, pagination behavior, or rate limiting that would help an agent predict outcomes.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three sentences with zero waste. Front-loaded with primary purpose ('Browse Amazon products by category'), followed by conditional logic for the optional parameter. Every sentence earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Adequately covers the core dual-functionality logic given the simple 3-parameter schema, but lacks description of return values or output structure (no output schema exists to compensate), leaving agents uncertain about what data structure they will receive.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, establishing baseline 3. The description echoes schema content (explaining the omit/provide category behavior) but adds no additional semantic context about parameter formats, constraints, or relationships beyond what the schema already provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States specific verb+resource ('Browse Amazon products by category') and clarifies the dual functionality (listing categories vs. browsing products). Distinguishes from browse_by_brand by resource type, though could explicitly contrast with search_products.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides clear parameter-level guidance ('Omit category to list... Provide a category name to get...'), but lacks explicit comparison to sibling tools like search_products or browse_by_brand for when to select this over alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

create_in_stock_alertAInspect

Create a back-in-stock alert. You'll receive an email when the product becomes available again.

ParametersJSON Schema
NameRequiredDescriptionDefault
emailYesThe email address to send the alert to
product_idYesThe product ID returned by search_products or other discovery tools
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden. It discloses the trigger mechanism (email when available) but omits operational details like alert persistence, cancellation policies, expiration, or whether duplicate alerts are permitted.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two efficient sentences with zero waste. Front-loaded with the action ('Create'), followed by mechanism explanation. Every word earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a two-parameter tool without output schema, the description covers the core user value proposition. However, it lacks edge case handling (e.g., product already in stock) and persistence model details that would help an agent handle failures or user questions.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has 100% description coverage, establishing a baseline of 3. The description adds narrative context linking email to receipt of notification, but doesn't add parameter syntax, validation rules, or format details beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses specific verb 'Create' with clear resource 'back-in-stock alert', and explicitly distinguishes from sibling create_price_alert by specifying 'back-in-stock' vs price monitoring. The mechanism (email notification) is clearly stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

While the name and description imply usage for out-of-stock products, there's no explicit guidance on when to use this versus create_price_alert, or prerequisites like verifying the product is actually unavailable. Usage is implied but not prescribed.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

create_price_alertAInspect

Create a price drop alert. You'll receive an email when the product drops to or below your target price.

ParametersJSON Schema
NameRequiredDescriptionDefault
emailYesThe email address to send the alert to
product_idYesThe product ID returned by search_products or other discovery tools
target_priceYesThe target price — alert is sent when the product drops to or below this price
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden. It discloses the notification mechanism (email) and trigger logic (price <= target), but omits alert lifecycle details such as expiration, cancellation capabilities, or whether alerts are one-time vs. recurring.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences with zero waste: the first declares the action, the second explains the behavioral outcome. Information is front-loaded and every clause earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple 3-parameter schema with 100% coverage and no output schema, the description adequately covers the invocation contract. It could improve by mentioning alert management (deletion/modification) or duration constraints, but it is sufficient for correct usage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, establishing a baseline of 3. The description adds minimal semantic value beyond the schema—primarily confirming the email parameter is used for receiving notifications and reinforcing the target_price threshold logic.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('Create') and resource ('price drop alert') that clearly distinguishes it from sibling create_in_stock_alert. It explicitly scopes the functionality to price monitoring rather than availability tracking.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explains the trigger condition ('when the product drops to or below your target price'), which implicitly distinguishes usage from create_in_stock_alert. However, it does not explicitly mention the sibling alternative or state when to prefer one over the other.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_price_dropsBInspect

Get Amazon products with recent significant price drops. Returns products sorted by drop percentage.

ParametersJSON Schema
NameRequiredDescriptionDefault
limitNoNumber of results to return (1-20). Defaults to 10.
regionNoCountry code (e.g. uk, us, de). Defaults to uk.uk
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description must carry the full burden of behavioral disclosure. It only mentions that results are 'sorted by drop percentage' but fails to define what constitutes 'significant' drops, the time window for 'recent', rate limits, authentication requirements, or the structure of returned product data.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description consists of exactly two efficient sentences with zero waste. The first sentence front-loads the core action and scope, while the second adds the sorting behavior. Every word earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (two optional scalar parameters, no nested objects) and lack of output schema, the description minimally addresses the return format by mentioning sorting. However, it omits details about what product fields are returned, leaving a gap for a data retrieval tool with no output schema documentation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 100% description coverage for both parameters (limit and region), so the baseline score applies. The description does not add syntax details or parameter interaction notes beyond what the schema already provides, but the schema is self-sufficient.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool retrieves 'Amazon products with recent significant price drops' using the specific verb 'Get' plus resource. However, it does not explicitly distinguish from siblings like search_products or get_price_history in the description text itself, relying on the tool name to imply the deal-finding purpose.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives like search_products (for specific queries) or get_price_history (for tracking specific items). There are no stated prerequisites, exclusions, or workflow recommendations.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_price_forecastAInspect

Get a 30-day price forecast for a product. Requires sufficient price history. Returns predicted prices with confidence scores.

ParametersJSON Schema
NameRequiredDescriptionDefault
product_idYesThe product ID returned by search_products or other discovery tools
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full disclosure burden. It adds valuable context about return format ('predicted prices with confidence scores') and the history prerequisite, but omits error handling behavior, rate limits, or what constitutes 'sufficient' history.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three concise sentences with zero redundancy: action/scope, prerequisite, and return format. Information is front-loaded and every clause earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a single-parameter tool without output schema or annotations, the description adequately covers the 30-day scope, prerequisite requirements, and return structure (confidence scores). Minor gap regarding error states or caching behavior prevents a 5.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% for the single parameter, documenting that product_id comes from search_products. The description adds no additional parameter details, meeting the baseline expectation when the schema is already comprehensive.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific action ('Get'), resource ('price forecast'), scope ('30-day'), and clearly distinguishes from sibling tools like get_price_history and get_price_statistics by emphasizing predictive future pricing rather than historical data.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description identifies a prerequisite ('Requires sufficient price history') which implies when the tool might fail, but lacks explicit guidance on when to choose this over siblings like get_price_history or get_price_statistics, and doesn't outline the discovery workflow (e.g., 'use after search_products').

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_price_historyAInspect

Get price history for a product by product_id. Returns daily prices for up to 90 days.

ParametersJSON Schema
NameRequiredDescriptionDefault
daysNoNumber of days of history to return (1-90). Defaults to 90.
product_idYesThe product ID returned by search_products or other discovery tools
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden. It successfully discloses the temporal granularity ('daily prices') and data window limit ('up to 90 days'), but lacks information on error cases, rate limits, or data availability gaps (weekends/holidays).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences with zero waste. First sentence establishes the core action and required parameter; second sentence specifies return format and temporal limits. Information is front-loaded and dense.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple read-only tool with 100% schema coverage and no nested objects, the description is adequate. It mentions the return type ('daily prices') despite the absence of an output schema, though it could specify the data structure format (array vs object).

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, establishing a baseline of 3. The description references product_id and the 90-day constraint, which aligns with the days parameter limits, but adds minimal semantic detail beyond what the schema already provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Specific verb 'Get' + resource 'price history' + scope 'daily prices for up to 90 days' clearly defines the tool's function. It implicitly distinguishes from siblings like get_price_statistics (aggregates) and get_price_forecast (future predictions) by emphasizing historical daily data.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides implicit usage guidance through the 90-day limitation mention, but lacks explicit when-to-use guidance versus alternatives like get_price_statistics or get_price_drops. Does not mention the prerequisite of obtaining product_id from search_products (though this appears in the schema description).

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_price_statisticsAInspect

Get price statistics for a product (all-time high/low, mean, median, histogram). Uses cached data for performance.

ParametersJSON Schema
NameRequiredDescriptionDefault
product_idYesThe product ID returned by search_products or other discovery tools
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden. It successfully discloses the caching behavior ('Uses cached data for performance') and enumerates return content (histogram, mean, median, highs/lows) to compensate for the missing output schema. However, it omits cache staleness details, rate limits, or authorization requirements.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences with zero waste: first sentence front-loads purpose and specific outputs; second sentence adds critical performance characteristics. Every word earns its place with no redundancy or filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple single-parameter input and lack of output schema, the description adequately compensates by listing the specific statistical aggregations returned. It covers the caching implication. Minor gaps remain regarding exact time window definitions (though 'all-time' is mentioned) and cache refresh behavior.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% for the single parameter (product_id), so the baseline is 3. The description text itself does not add parameter semantics, but the schema fully documents the input. No additional syntax or format details are provided in the description, but none are needed given complete schema coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description uses specific verb 'Get' with clear resource 'price statistics' and enumerates exact metrics (all-time high/low, mean, median, histogram). This distinguishes it from sibling tools like get_price_history (time-series) or get_price_drops (specific events) by emphasizing statistical aggregation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description mentions 'Uses cached data for performance,' implying when to use it (speed over real-time), but lacks explicit when-to-use guidance versus alternatives like get_price_history or get_price_forecast. No explicit prerequisites or exclusions are stated, though the schema notes the product_id source.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_productAInspect

Get detailed product information by product_id. Returns full product details including current price and affiliate buy link.

ParametersJSON Schema
NameRequiredDescriptionDefault
product_idYesThe product ID returned by search_products or other discovery tools
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so description carries full burden. It discloses return content ('full product details including current price and affiliate buy link') which compensates for missing output schema, but lacks explicit safety guarantees, rate limits, or error behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two efficient sentences with zero waste. Front-loaded with action ('Get detailed product information'), followed by return value specification. Every word earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Appropriate for a single-parameter lookup tool. Since no output schema exists, the description adequately explains what is returned (full details, price, affiliate link). Minor gap regarding error handling or invalid product_id behavior.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, establishing baseline 3. The description adds minimal semantic value beyond the schema, merely confirming the product_id is the lookup key, but does not contradict or elaborate on format constraints.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clear verb ('Get') and resource ('product information'), with specific return details (current price, affiliate buy link) that distinguish it from sibling price tools like get_price_history. However, it does not explicitly contrast with search_products or browse operations.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Implies workflow through the parameter description referencing 'search_products', but the main description lacks explicit when-to-use guidance or contrast with alternatives like get_similar_products.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_similar_productsBInspect

Find products similar to a given product. Useful for discovering alternatives or related items.

ParametersJSON Schema
NameRequiredDescriptionDefault
limitNoNumber of similar products to return (1-20). Defaults to 6.
product_idYesThe product ID to find similar products for
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden of behavioral disclosure. While it clarifies the intent ('alternatives or related items'), it fails to disclose operational traits: whether the operation is read-only, what happens if the product_id doesn't exist, rate limits, or what 'similarity' specifically entails (content-based vs. collaborative filtering).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description consists of exactly two efficient sentences with no redundancy. The purpose is front-loaded in the first sentence, followed immediately by the use case context. Every sentence earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (2 parameters, no nesting, 100% schema coverage), the description is minimally adequate for invocation. However, gaps remain: without an output schema, the description should ideally specify the return format (e.g., list of product objects vs. IDs), and error states are unaddressed.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 100% schema description coverage, the schema fully documents both parameters (product_id and limit) including defaults and constraints. The description adds minimal semantic value beyond the schema, merely implying that product_id serves as the reference product for similarity matching.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the core function ('Find products similar to a given product') with specific verb and resource. It implicitly distinguishes from siblings like search_products (keyword-based) and browse_by_category (taxonomy-based) by focusing on item-to-item similarity, though it doesn't explicitly contrast with them.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides a hint about use cases ('Useful for discovering alternatives or related items'), but offers no explicit guidance on when to select this tool over alternatives like search_products or browse_by_category, nor does it mention prerequisites or exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

register_api_keyAInspect

Register for a free API key to increase your rate limits from 20/min to 120/min. An API key will be emailed to you.

ParametersJSON Schema
NameRequiredDescriptionDefault
emailYesYour email address. The API key will be sent here.
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so description carries full burden. Discloses specific rate limit numbers (20→120), cost ('free'), and delivery mechanism ('emailed to you'). Missing edge case handling (e.g., duplicate registration, email delivery timing).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences with zero waste. First sentence front-loads purpose and quantitative benefit; second sentence explains delivery mechanism. Every word earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Appropriate for low complexity (1 param, no nesting). Compensates for missing output schema by explaining the async delivery outcome ('API key will be emailed'). Could improve by mentioning how to use the key in subsequent sibling tool calls.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, establishing baseline 3. Description reinforces the email parameter's purpose ('API key will be emailed to you') but adds no additional syntax, format constraints, or validation rules beyond the schema's 'Your email address' description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Specific verb 'Register' + resource 'API key' with clear value proposition (rate limits 20/min to 120/min). Distinct from product-focused siblings (browse, search, alert tools) by addressing authentication rather than data retrieval.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states the benefit condition (increasing rate limits from 20/min to 120/min), implying when to use. Lacks explicit 'when not to use' or alternatives, though siblings are functionally distinct enough that confusion is unlikely.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

search_productsAInspect

Search for Amazon products by keyword, ASIN, or Amazon URL with optional filters for brand, category, price range, stock status, and sorting. Returns product IDs for use with other tools. Rate limited to 20 req/min without an API key — use the register_api_key tool for 120 req/min.

ParametersJSON Schema
NameRequiredDescriptionDefault
brandNoFilter by brand name (e.g. Apple, Samsung, Sony)
limitNoNumber of results to return (1-50). Defaults to 20.
queryNoSearch keyword, Amazon ASIN (e.g. B08N5WRWNW), or Amazon product URL. Optional when using brand/category filters.
regionNoCountry code (e.g. uk, us, de). Defaults to uk.uk
sort_byNoSort order for results. Defaults to relevance.relevance
categoryNoFilter by category (e.g. Laptops, Headphones, TVs)
in_stockNoWhen true, only returns in-stock products. When false, returns both in-stock and out-of-stock products (it does NOT filter to out-of-stock only). Defaults to true.
max_priceNoMaximum price in the region's currency (e.g. 500 for £500)
min_priceNoMinimum price in the region's currency (e.g. 100 for £100)
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided. Description discloses rate limits and return type (product IDs). Does not explicitly state read-only behavior, but the search operation implies it. Could be more transparent about safety.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences: first covers purpose and features, second covers rate limits and a tip. Front-loaded and no wasted words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers search methods, filters, output (product IDs), and rate limits. No output schema, so return format is adequately described. Could mention pagination or result structure, but limit parameter helps. Adequate for a search tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema covers all 9 parameters with descriptions. Description adds value by specifying that query can be keyword, ASIN, or URL and that it's optional when using brand/category filters. Provides context beyond schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states verb (search), resource (Amazon products), and various search methods (keyword, ASIN, URL). Distinguishes from sibling tools like browse_by_brand and browse_by_category by being a general search.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides rate limits and suggests using register_api_key for higher limits. Does not explicitly exclude alternatives but gives clear context for tool usage.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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