Friction as Feature: Tool Proficiencies at the Table
The Rule
Tool proficiencies in 5.5e work through a simple framework: when a task falls within a tool’s scope, a character with proficiency adds their proficiency bonus to the relevant ability check. The 2024 Player’s Handbook assigns each tool a primary ability score, specifies what you can craft with it, and describes its Utilize action, the thing you can do with it during play without a check. Xanathar’s Guide to Everything supplements this with expanded skill interactions, example activities, and DCs. Neither source requires you to use both; they stack when you do.
What the books don’t tell you is how much interpretive weight the DM carries. The Maintain Shoes feature on Cobbler’s Tools works beautifully if your DM tracks travel hours. It’s decorative text if they don’t. The Cook’s Utensils short rest meal works if your group rolls hit dice and cares about the margins. The glass examination abilities in Glassblower’s Tools work if someone in the game is actually carrying around empty potion bottles worth studying. Tools live or die by campaign context in a way that, say, a fighter’s Action Surge simply does not.
Common Misreadings
The mistake most groups make with tool proficiencies isn’t mechanical. It’s categorical. Tools get treated as background flavor, the thing you picked at character creation because your backstory mentioned you were an apprentice glassblower, and then never touched again. Meanwhile the same group will spend twenty minutes debating whether a spell slot is worth using, because spell slots feel like resources. Tool proficiencies are also resources. They are just quieter about it.
The Cook’s Utensils short rest feature is a good example of a quiet resource getting ignored. One extra hit point per hit die spent, up to five creatures. At level ten, a fighter burning three dice gets three extra HP. Multiply that across a full party after every short rest and you are looking at a meaningful cushion across a long adventuring day. It costs nothing but the proficiency you already have. It requires no action economy during combat. It is, in the most understated way possible, good. But because it comes from a pot and a stirring spoon rather than a spell slot, it disappears from the mental ledger.
Edge Cases
The hidden compartment on Cobbler’s Tools is the one that generates the most interesting edge case conversation, mostly because the dimensions are so specific they feel like a test. Three inches long, one inch wide and deep. Thieves’ tools are listed at six inches. The compartment was built to hold almost everything except the one thing a rogue would actually want to hide there. Whether that is oversight or design philosophy we cannot say, but the RAW outcome is that your beautifully crafted boot compartment cannot hold your lockpicks unless someone makes a ruling about foldable thieves’ tools, which is a conversation no other game mechanic has ever required.
The Investigate application on Cobbler’s Tools cuts the other way: it works best when the DM has thought about the world independently of the players. If the DM describes every NPC from the neck up, the “you can read where someone has been by examining shoe wear” feature has nothing to grip. But in a campaign where the world exists before the players arrive, where the half-orc merchant has been somewhere recently because of a plot thread the DM developed in prep, not because a player asked, the cobbler becomes an unexpected information source. The feature does not create information. It extracts information the DM already seeded.
Glassblower’s Tools give you a Investigate feature that is straightforwardly useful in one specific scenario: someone else was here, they drank something, and they left the bottle. That is the sweet spot. The potion-reading application gets murky when the potion is still present, because the text implies residue and glass interaction as the mechanism, which suggests at minimum some time-in-contact requirement. House rule it how you like, but the comparison to wine legs is apt in a way that is not flattering to the mechanic. The science is suggestive, not determinative. Your glassblower probably knows more than a layperson. Whether they know enough to identify a potion by swirling it is a table conversation, not a rules answer.
The identify glass weaknesses feature doubles damage to a glass object struck at a specific weak point. It takes one minute to identify the weak point. This is the mechanic most likely to generate the question “why does this exist?” and we do not have a satisfying answer. It works on magic glass, presumably, and maybe that is where it earns its place. But the image of a trained glassblower spending a minute studying a glass object before a rogue smashes it for slightly more damage is a comedic premise wrapped in a rules feature.
At the Table
If you are a DM who runs tools as passive flavor, the one change worth making is to start asking the container question. Not as an obstacle, as an invitation. “How are you holding this?” is not obstructionism when you follow it with genuine curiosity about the answer. Players given a small, low-stakes problem to solve tend to produce solutions that are more memorable than anything you scripted. The glassblower makes vials. The cobbler makes a boot compartment. These are not intrusions on the narrative; they are texture.
The broader principle is that tool proficiencies reward friction. Not the friction of “you failed your check, nothing happens,” but the friction of “this is a problem that exists, and your character’s background gives you a way through it that no one else at the table has.” That is a different category of value than +5 to Arcana. It is not about numbers. It is about the moment where the person who picked Cobbler’s Tools at character creation because it fit their backstory gets to look up from their character sheet and say, “Actually, I’ve got this.”
Whether “this” is maintaining six party members’ shoes for a desert crossing, identifying the magical properties of the boots you just looted before the wizard can perform Identify, or hiding something extremely small and not-a-set-of-thieves’-tools in a boot heel, the cobbler finally has a scene. Give them the scene.